Overheating engine Part 2

A couple of weeks ago I wrote about my engine overheating and after several days I thought I had limited it to a bad thermostat. I have since replaced the thermostat, all water hoses, the pump impeller (again), pushed city water through the thru hull and I'm still not sure what the problem is. For one more test I connected a garden hose to the pump inlet and ran water through the engine successfully, I didn't have a recycle stream so the engine stayed cool with no exhaust discharge. I then put the pump suction into a pail of water and nothing was sucked up into the engine, this seems to indicate a bad pump but with new impeller and no leaks is this likely? The pump is an oberdorfer, the engine is a universal 5411. IO've thought about looking for an electric pump to try to resolve the issue but I don't know what size to get. Any ideas? Thanks for any help John Boyce Cal 227 Gotcha Again

What drives the pump now a belt or a chain? Could whatever drives the impeller be bad? Paul From: John Boyce <je… [at] gmail.com> To: Cal_Boats <Ca… [at] yahoogroups.com> Sent: Fri, Aug 30, 2013 5:18 pm Subject: [Cal_Boats] Overheating engine Part 2 A couple of weeks ago I wrote about my engine overheating and after several days I thought I had limited it to a bad thermostat. I have since replaced the thermostat, all water hoses, the pump impeller (again), pushed city water through the thru hull and I’m still not sure what the problem is. For one more test I connected a garden hose to the pump inlet and ran water through the engine successfully, I didn’t have a recycle stream so the engine stayed cool with no exhaust discharge. I then put the pump suction into a pail of water and nothing was sucked up into the engine, this seems to indicate a bad pump but with new impeller and no leaks is this likely? The pump is an oberdorfer, the engine is a universal 5411. IO’ve thought about looking for an electric pump to try to resolve the issue but I don’t know what size to get. Any ideas? Thanks for any help John Boyce Cal 227 Gotcha Again

Hi John - The 5411 [ and the later model designation, M15 ] was the only raw water cooled diesel engine produced by Universal. The cooling system is a very poor design, resulting in minimal water flow when the engine is running. The Kubota engine that's used in the 5411 was never intended to have salt water run through it. As such, when the engine gets old, it starts to plug from internal rust, further hampering coolant flow. Eventually, the head will rot out internally, allowing raw water to enter the oil pan. This results in raw water combining with the lube oil, and contaminating every engine bearing with compromised oil. You can guess the result. This happened to the 5411 engine in my own boat. Any old raw water cooled engine is a VERY POOR candidate for rebuilding. The writing is on the wall for your engine, start saving for a replacement. *Joe DeMers - owner* Sound Marine Diesel LLC SoundMarineDiesel.com <http://www.soundmarinediesel.com/> *phone & fax (860) 666-2184* On 8/30/2013 5:18 PM, John Boyce wrote: > > > A couple of weeks ago I wrote about my engine overheating and after > several days I thought I had limited it to a bad thermostat. I have > since replaced the thermostat, all water hoses, the pump impeller > (again), pushed city water through the thru hull and I'm still not > sure what the problem is. For one more test I connected a garden hose > to the pump inlet and ran water through the engine successfully, I > didn't have a recycle stream so the engine stayed cool with no exhaust > discharge. I then put the pump suction into a pail of water and > nothing was sucked up into the engine, this seems to indicate a bad > pump but with new impeller and no leaks is this likely? The pump is an > oberdorfer, the engine is a universal 5411. IO've thought about > looking for an electric pump to try to resolve the issue but I don't > know what size to get. Any ideas? > > Thanks for any help > > John Boyce > > Cal 227 Gotcha Again > > > > > > No virus found in this message. > Checked by AVG - www.avg.com <http://www.avg.com> > Version: 2013.0.3392 / Virus Database: 3211/6623 - Release Date: 08/30/13 > -- *Joe DeMers - owner* Sound Marine Diesel LLC SoundMarineDiesel.com <http://www.soundmarinediesel.com/> *phone & fax (860) 666-2184*

Do you have a hot water heater? If so this could be the problem as the heater is a heat exchanger using the fresh water system From: Ca… [at] yahoogroups.com [mailto:Ca… [at] yahoogroups.com] On Behalf Of pw… [at] aol.com Sent: Friday, August 30, 2013 5:25 PM To: Ca… [at] yahoogroups.com Subject: Re: [Cal_Boats] Overheating engine Part 2 What drives the pump now a belt or a chain? Could whatever drives the impeller be bad? Paul From: John Boyce <je… [at] gmail.com> To: Cal_Boats <Ca… [at] yahoogroups.com> Sent: Fri, Aug 30, 2013 5:18 pm Subject: [Cal_Boats] Overheating engine Part 2 A couple of weeks ago I wrote about my engine overheating and after several days I thought I had limited it to a bad thermostat. I have since replaced the thermostat, all water hoses, the pump impeller (again), pushed city water through the thru hull and I’m still not sure what the problem is. For one more test I connected a garden hose to the pump inlet and ran water through the engine successfully, I didn’t have a recycle stream so the engine stayed cool with no exhaust discharge. I then put the pump suction into a pail of water and nothing was sucked up into the engine, this seems to indicate a bad pump but with new impeller and no leaks is this likely? The pump is an oberdorfer, the engine is a universal 5411. IO’ve thought about looking for an electric pump to try to resolve the issue but I don’t know what size to get. Any ideas? Thanks for any help John Boyce Cal 227 Gotcha Again

I have traditionally had some issues with my pumps. What I found out the other day was that if I just start the engine (warm) after a race it will start right up without giving it gas. But when I did that, no water. I need to give it a little gas and rev it up to "prime the pump". Once water starts flowing, it keeps going. I think this is because my inlet hose goes above water level so the hose can drain. It is also possible that the exhaust side has a lot of back pressure. Actually, that is likely as when I designed the exhaust layout at least one person told me it would not work. But the professionally installed exhaust layout would fill the engine with salt water so I took a chance. I guess what I am saying is that my system would not draw water out of a bucket until I primed the pump but otherwise works just fine and it has been this way with several new pumps so not a sign of a bad pump. They apparently do not draw air very well. That said, I just read Joe's reply that came in as I was writing this. I rebuilt my engine and I can tell you in hindsight I wish I had put in a new engine. I wanted to keep gas and it runs fine (finally) but still, I am just one breakdown from making it clear that a new engine would have been the way to go. I also watched a dockmate pour thousands of dollars and 7 years fixing an old engine. I think he finally got it running but it literally took him 7 years of fixing it only to have it break after a week or so and then another 6 months fixing it. He could have easily paid for a new engine for what he spent. Allen On Fri, Aug 30, 2013 at 2:24 PM, <pw… [at] aol.com> wrote: > ** > > > What drives the pump now a belt or a chain? Could whatever drives the > impeller be bad? > > Paul > -----Original Message----- > From: John Boyce <je… [at] gmail.com> > To: Cal_Boats <Ca… [at] yahoogroups.com> > Sent: Fri, Aug 30, 2013 5:18 pm > Subject: [Cal_Boats] Overheating engine Part 2 > > > A couple of weeks ago I wrote about my engine overheating and after > several days I thought I had limited it to a bad thermostat. I have since > replaced the thermostat, all water hoses, the pump impeller (again), pushed > city water through the thru hull and I’m still not sure what the problem > is. For one more test I connected a garden hose to the pump inlet and ran > water through the engine successfully, I didn’t have a recycle stream so > the engine stayed cool with no exhaust discharge. I then put the pump > suction into a pail of water and nothing was sucked up into the engine, > this seems to indicate a bad pump but with new impeller and no leaks is > this likely? The pump is an oberdorfer, the engine is a universal 5411. > IO’ve thought about looking for an electric pump to try to resolve the > issue but I don’t know what size to get. Any ideas? > > Thanks for any help > > John Boyce > Cal 227 Gotcha Again > > >

Joe - The PO of my Cal 39 installed a 56hp Yanmar (4JGH or something like that) and at idle and slightly above (sorry I don't have exact RPM's) the oil pressure guage isn't reading anything. Is it most likely my guage or sending unit or should I be concerned? When I rev it up the pressure jumps right up. Thanks - Paul West From: Joe DeMers <je… [at] mindspring.com> To: Cal_Boats <Ca… [at] yahoogroups.com> Sent: Fri, Aug 30, 2013 5:32 pm Subject: Re: [Cal_Boats] Overheating engine Part 2 Hi John - The 5411 [ and the later model designation, M15 ] was the only raw water cooled diesel engine produced by Universal. The cooling system is a very poor design, resulting in minimal water flow when the engine is running. The Kubota engine that's used in the 5411 was never intended to have salt water run through it. As such, when the engine gets old, it starts to plug from internal rust, further hampering coolant flow. Eventually, the head will rot out internally, allowing raw water to enter the oil pan. This results in raw water combining with the lube oil, and contaminating every engine bearing with compromised oil. You can guess the result. This happened to the 5411 engine in my own boat. Any old raw water cooled engine is a VERY POOR candidate for rebuilding. The writing is on the wall for your engine, start saving for a replacement. Joe DeMers - owner Sound Marine Diesel LLC SoundMarineDiesel.com phone & fax (860) 666-2184 On 8/30/2013 5:18 PM, John Boyce wrote: A couple of weeks ago I wrote about my engine overheating and after several days I thought I had limited it to a bad thermostat. I have since replaced the thermostat, all water hoses, the pump impeller (again), pushed city water through the thru hull and I’m still not sure what the problem is. For one more test I connected a garden hose to the pump inlet and ran water through the engine successfully, I didn’t have a recycle stream so the engine stayed cool with no exhaust discharge. I then put the pump suction into a pail of water and nothing was sucked up into the engine, this seems to indicate a bad pump but with new impeller and no leaks is this likely? The pump is an oberdorfer, the engine is a universal 5411. IO’ve thought about looking for an electric pump to try to resolve the issue but I don’t know what size to get. Any ideas? Thanks for any help John Boyce Cal 227 Gotcha Again No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.3392 / Virus Database: 3211/6623 - Release Date: 08/30/13 -- Joe DeMers - owner Sound Marine Diesel LLC SoundMarineDiesel.com phone & fax (860) 666-2184

Thanks for the encouragement, Maybe the only good thing is that I am not in salt water, even in its most polluted state it was still considered a fresh water lake. John B From: Ca… [at] yahoogroups.com [mailto:Ca… [at] yahoogroups.com] On Behalf Of Joe DeMers Sent: Friday, August 30, 2013 5:32 PM To: Ca… [at] yahoogroups.com Subject: Re: [Cal_Boats] Overheating engine Part 2 Hi John - The 5411 [ and the later model designation, M15 ] was the only raw water cooled diesel engine produced by Universal. The cooling system is a very poor design, resulting in minimal water flow when the engine is running. The Kubota engine that's used in the 5411 was never intended to have salt water run through it. As such, when the engine gets old, it starts to plug from internal rust, further hampering coolant flow. Eventually, the head will rot out internally, allowing raw water to enter the oil pan. This results in raw water combining with the lube oil, and contaminating every engine bearing with compromised oil. You can guess the result. This happened to the 5411 engine in my own boat. Any old raw water cooled engine is a VERY POOR candidate for rebuilding. The writing is on the wall for your engine, start saving for a replacement. Joe DeMers - owner Sound Marine Diesel LLC <http://www.soundmarinediesel.com/> SoundMarineDiesel.com phone & fax (860) 666-2184 On 8/30/2013 5:18 PM, John Boyce wrote: A couple of weeks ago I wrote about my engine overheating and after several days I thought I had limited it to a bad thermostat. I have since replaced the thermostat, all water hoses, the pump impeller (again), pushed city water through the thru hull and I'm still not sure what the problem is. For one more test I connected a garden hose to the pump inlet and ran water through the engine successfully, I didn't have a recycle stream so the engine stayed cool with no exhaust discharge. I then put the pump suction into a pail of water and nothing was sucked up into the engine, this seems to indicate a bad pump but with new impeller and no leaks is this likely? The pump is an oberdorfer, the engine is a universal 5411. IO've thought about looking for an electric pump to try to resolve the issue but I don't know what size to get. Any ideas? Thanks for any help John Boyce Cal 227 Gotcha Again No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.3392 / Virus Database: 3211/6623 - Release Date: 08/30/13 -- Joe DeMers - owner Sound Marine Diesel LLC <http://www.soundmarinediesel.com/> SoundMarineDiesel.com phone & fax (860) 666-2184

I suggest the oil pressure be checked with a mechanical test gauge. This will reveal what is really happening with this critical engine system. What brand and weight oil are you using? Is this lube oil diesel grade oil? What brand oil filter? How many hours on the engine? *Joe DeMers - owner* Sound Marine Diesel LLC SoundMarineDiesel.com <http://www.soundmarinediesel.com/> *phone & fax (860) 666-2184* On 8/30/2013 5:37 PM, pw… [at] aol.com wrote: > > > Joe - > The PO of my Cal 39 installed a 56hp Yanmar (4JGH or something like > that) and at idle and slightly above (sorry I don't have exact RPM's) > the oil pressure guage isn't reading anything. Is it most likely my > guage or sending unit or should I be concerned? When I rev it up the > pressure jumps right up. > Thanks - > Paul West > -----Original Message----- > From: Joe DeMers <je… [at] mindspring.com> > To: Cal_Boats <Ca… [at] yahoogroups.com> > Sent: Fri, Aug 30, 2013 5:32 pm > Subject: Re: [Cal_Boats] Overheating engine Part 2 > > Hi John - > The 5411 [ and the later model designation, M15 ] was the only raw > water cooled diesel engine produced by Universal. The cooling system > is a very poor design, resulting in minimal water flow when the engine > is running. > > The Kubota engine that's used in the 5411 was never intended to have > salt water run through it. As such, when the engine gets old, it > starts to plug from internal rust, further hampering coolant flow. > Eventually, the head will rot out internally, allowing raw water to > enter the oil pan. This results in raw water combining with the lube > oil, and contaminating every engine bearing with compromised oil. You > can guess the result. > This happened to the 5411 engine in my own boat. > > Any old raw water cooled engine is a VERY POOR candidate for rebuilding. > > The writing is on the wall for your engine, start saving for a > replacement. > *Joe DeMers - owner * > Sound Marine Diesel LLC > SoundMarineDiesel.com <http://www.soundmarinediesel.com/> > *phone & fax (860) 666-2184 * > > On 8/30/2013 5:18 PM, John Boyce wrote: >> >> >> A couple of weeks ago I wrote about my engine overheating and after >> several days I thought I had limited it to a bad thermostat. I have >> since replaced the thermostat, all water hoses, the pump impeller >> (again), pushed city water through the thru hull and I’m still not >> sure what the problem is. For one more test I connected a garden >> hose to the pump inlet and ran water through the engine successfully, >> I didn’t have a recycle stream so the engine stayed cool with no >> exhaust discharge. I then put the pump suction into a pail of water >> and nothing was sucked up into the engine, this seems to indicate a >> bad pump but with new impeller and no leaks is this likely? The pump >> is an oberdorfer, the engine is a universal 5411. IO’ve thought >> about looking for an electric pump to try to resolve the issue but I >> don’t know what size to get. Any ideas? >> Thanks for any help >> John Boyce >> Cal 227 Gotcha Again >> >> >> No virus found in this message. >> Checked by AVG - www.avg.com <http://www.avg.com> >> Version: 2013.0.3392 / Virus Database: 3211/6623 - Release Date: >> 08/30/13 > > -- > *Joe DeMers - owner * > Sound Marine Diesel LLC > SoundMarineDiesel.com <http://www.soundmarinediesel.com/> > *phone & fax (860) 666-2184 * > > > > > No virus found in this message. > Checked by AVG - www.avg.com <http://www.avg.com> > Version: 2013.0.3392 / Virus Database: 3211/6623 - Release Date: 08/30/13 > -- *Joe DeMers - owner* Sound Marine Diesel LLC SoundMarineDiesel.com <http://www.soundmarinediesel.com/> *phone & fax (860) 666-2184*

I suggest the oil pressure be checked with a mechanical test gauge. This will reveal what is really happening with this critical engine system. Will this screw in where the existing sending unit is? What brand and weight oil are you using? Rotella 15-40 Is this lube oil diesel grade oil? Yes What brand oil filter? Yanmar. I heard that you have to use Yanmar because the oil pressure isn't regulated prior to going in the filter and it is so high that it would destroy the inside of a normal filter. Is that really the case? How many hours on the engine? Around 1600 as I recall. Thanks Joe! Joe DeMers - owner Sound Marine Diesel LLC SoundMarineDiesel.com phone & fax (860) 666-2184 On 8/30/2013 5:37 PM, pw… [at] aol.com wrote: Joe - The PO of my Cal 39 installed a 56hp Yanmar (4JGH or something like that) and at idle and slightly above (sorry I don't have exact RPM's) the oil pressure guage isn't reading anything. Is it most likely my guage or sending unit or should I be concerned? When I rev it up the pressure jumps right up. Thanks - Paul West -----Original Message----- From: Joe DeMers <je… [at] mindspring.com> To: Cal_Boats <Ca… [at] yahoogroups.com> Sent: Fri, Aug 30, 2013 5:32 pm Subject: Re: [Cal_Boats] Overheating engine Part 2 Hi John - The 5411 [ and the later model designation, M15 ] was the only raw water cooled diesel engine produced by Universal. The cooling system is a very poor design, resulting in minimal water flow when the engine is running. The Kubota engine that's used in the 5411 was never intended to have salt water run through it. As such, when the engine gets old, it starts to plug from internal rust, further hampering coolant flow. Eventually, the head will rot out internally, allowing raw water to enter the oil pan. This results in raw water combining with the lube oil, and contaminating every engine bearing with compromised oil. You can guess the result. This happened to the 5411 engine in my own boat. Any old raw water cooled engine is a VERY POOR candidate for rebuilding. The writing is on the wall for your engine, start saving for a replacement. Joe DeMers - owner Sound Marine Diesel LLC SoundMarineDiesel.com phone & fax (860) 666-2184 On 8/30/2013 5:18 PM, John Boyce wrote: A couple of weeks ago I wrote about my engine overheating and after several days I thought I had limited it to a bad thermostat. I have since replaced the thermostat, all water hoses, the pump impeller (again), pushed city water through the thru hull and I’m still not sure what the problem is. For one more test I connected a garden hose to the pump inlet and ran water through the engine successfully, I didn’t have a recycle stream so the engine stayed cool with no exhaust discharge. I then put the pump suction into a pail of water and nothing was sucked up into the engine, this seems to indicate a bad pump but with new impeller and no leaks is this likely? The pump is an oberdorfer, the engine is a universal 5411. IO’ve thought about looking for an electric pump to try to resolve the issue but I don’t know what size to get. Any ideas? Thanks for any help John Boyce Cal 227 Gotcha Again No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.3392 / Virus Database: 3211/6623 - Release Date: 08/30/13 -- Joe DeMers - owner Sound Marine Diesel LLC SoundMarineDiesel.com phone & fax (860) 666-2184 No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.3392 / Virus Database: 3211/6623 - Release Date: 08/30/13 -- Joe DeMers - owner Sound Marine Diesel LLC SoundMarineDiesel.com phone & fax (860) 666-2184

On 8/30/2013 8:27 PM, pw… [at] aol.com wrote: > > > > > I suggest the oil pressure be checked with a mechanical test gauge. > This will reveal what is really happening with this critical engine > system. > */Will this screw in where the existing sending unit is? > /* ******* Yes. > *//* > What brand and weight oil are you using? > */Rotella 15-40 > /* ******* Excellent. > *//* > Is this lube oil diesel grade oil? > /Yes > / > What brand oil filter? > */Yanmar. I heard that you have to use Yanmar because the oil > pressure isn't regulated prior to going in the filter and it is so > high that it would destroy the inside of a normal filter. Is that > really the case? > /* ****** It works this way - The oil pressure is regulated by the oil pressure regulation valve, located inside the engine. It consists of a spring and stainless steel ball in a cylinder. What sometimes happens is the ball gets sticky, or the spring gets weak, and oil pressure can be too high [ the oil filter can actually blow out ] or too low. This MAY be your problem, however, check the oil pressure FIRST , with a test gauge. Joe > *//* > How many hours on the engine? > */Around 1600 as I recall./* > *//* > */Thanks Joe!/* > > *Joe DeMers - owner * > Sound Marine Diesel LLC > SoundMarineDiesel.com <http://www.soundmarinediesel.com/> > *phone & fax (860) 666-2184 * > > On 8/30/2013 5:37 PM, pw… [at] aol.com <mailto:pw… [at] aol.com> wrote: >> >> >> Joe - >> The PO of my Cal 39 installed a 56hp Yanmar (4JGH or something like >> that) and at idle and slightly above (sorry I don't have exact RPM's) >> the oil pressure guage isn't reading anything. Is it most likely my >> guage or sending unit or should I be concerned? When I rev it up the >> pressure jumps right up. >> Thanks - >> Paul West >> -----Original Message----- >> From: Joe DeMers <je… [at] mindspring.com> <mailto:je… [at] mindspring.com> >> To: Cal_Boats <Ca… [at] yahoogroups.com> >> <mailto:Ca… [at] yahoogroups.com> >> Sent: Fri, Aug 30, 2013 5:32 pm >> Subject: Re: [Cal_Boats] Overheating engine Part 2 >> >> Hi John - >> The 5411 [ and the later model designation, M15 ] was the only raw >> water cooled diesel engine produced by Universal. The cooling system >> is a very poor design, resulting in minimal water flow when the >> engine is running. >> >> The Kubota engine that's used in the 5411 was never intended to have >> salt water run through it. As such, when the engine gets old, it >> starts to plug from internal rust, further hampering coolant flow. >> Eventually, the head will rot out internally, allowing raw water to >> enter the oil pan. This results in raw water combining with the lube >> oil, and contaminating every engine bearing with compromised oil. You >> can guess the result. >> This happened to the 5411 engine in my own boat. >> >> Any old raw water cooled engine is a VERY POOR candidate for rebuilding. >> >> The writing is on the wall for your engine, start saving for a >> replacement. >> *Joe DeMers - owner * >> Sound Marine Diesel LLC >> SoundMarineDiesel.com <http://www.soundmarinediesel.com/> >> *phone & fax (860) 666-2184 * >> >> On 8/30/2013 5:18 PM, John Boyce wrote: >>> >>> >>> A couple of weeks ago I wrote about my engine overheating and after >>> several days I thought I had limited it to a bad thermostat. I have >>> since replaced the thermostat, all water hoses, the pump impeller >>> (again), pushed city water through the thru hull and I’m still not >>> sure what the problem is. For one more test I connected a garden >>> hose to the pump inlet and ran water through the engine >>> successfully, I didn’t have a recycle stream so the engine stayed >>> cool with no exhaust discharge. I then put the pump suction into a >>> pail of water and nothing was sucked up into the engine, this seems >>> to indicate a bad pump but with new impeller and no leaks is this >>> likely? The pump is an oberdorfer, the engine is a universal 5411. >>> IO’ve thought about looking for an electric pump to try to resolve >>> the issue but I don’t know what size to get. Any ideas? >>> Thanks for any help >>> John Boyce >>> Cal 227 Gotcha Again >>> >>> >>> No virus found in this message. >>> Checked by AVG - www.avg.com <http://www.avg.com> >>> Version: 2013.0.3392 / Virus Database: 3211/6623 - Release Date: >>> 08/30/13 >> >> -- >> *Joe DeMers - owner * >> Sound Marine Diesel LLC >> SoundMarineDiesel.com <http://www.soundmarinediesel.com/> >> *phone & fax (860) 666-2184 * >> >> >> No virus found in this message. >> Checked by AVG - www.avg.com <http://www.avg.com> >> Version: 2013.0.3392 / Virus Database: 3211/6623 - Release Date: >> 08/30/13 > > -- > *Joe DeMers - owner * > Sound Marine Diesel LLC > SoundMarineDiesel.com <http://www.soundmarinediesel.com/> > *phone & fax (860) 666-2184 * > > > > > No virus found in this message. > Checked by AVG - www.avg.com <http://www.avg.com> > Version: 2013.0.3392 / Virus Database: 3211/6623 - Release Date: 08/30/13 > -- *Joe DeMers - owner* Sound Marine Diesel LLC SoundMarineDiesel.com <http://www.soundmarinediesel.com/> *phone & fax (860) 666-2184*

Yes What brand oil filter? Yanmar. I heard that you have to use Yanmar because the oil pressure isn't regulated prior to going in the filter and it is so high that it would destroy the inside of a normal filter. Is that really the case? ****** It works this way - The oil pressure is regulated by the oil pressure regulation valve, located inside the engine. It consists of a spring and stainless steel ball in a cylinder. What sometimes happens is the ball gets sticky, or the spring gets weak, and oil pressure can be too high [ the oil filter can actually blow out ] or too low. This MAY be your problem, however, check the oil pressure FIRST , with a test gauge. Joe Ugh!! How hard is that to fix should that be the problem? Do these mechanical gauges come with adapters for different engines or are they pretty much universal? Do you know what the pressure should be at idle and how many rpm's should it idle at? Thanks again Joe!

On 8/31/2013 8:20 AM, pw… [at] aol.com wrote: > > >> /Yes >> / >> What brand oil filter? >> */Yanmar. I heard that you have to use Yanmar because the oil >> pressure isn't regulated prior to going in the filter and it is so >> high that it would destroy the inside of a normal filter. Is that >> really the case? >> /* > > ****** It works this way - > The oil pressure is regulated by the oil pressure regulation valve, > located inside the engine. It consists of a spring and stainless steel > ball in a cylinder. What sometimes happens is the ball gets sticky, or > the spring gets weak, and oil pressure can be too high [ the oil > filter can actually blow out ] or too low. This MAY be your problem, > however, check the oil pressure FIRST , with a test gauge. > > Joe > /Ugh!! How hard is that to fix should that be the problem?/ ****** I would check the simple things first. > // > /Do these mechanical gauges come with adapters for different engines > or are they pretty much universal?/ ****** All depends upon the exact gauge you buy. However, any hardware store has pipe adapters. > // > /Do you know what the pressure should be at idle and how many rpm's > should it idle at?/ ***** Check the manual. Joe > // > /Thanks again Joe!/ > >> *//* > > > > > No virus found in this message. > Checked by AVG - www.avg.com <http://www.avg.com> > Version: 2013.0.3392 / Virus Database: 3222/6626 - Release Date: 08/31/13 > -- *Joe DeMers - owner* Sound Marine Diesel LLC SoundMarineDiesel.com <http://www.soundmarinediesel.com/> *phone & fax (860) 666-2184*

John, I had a very similar problem with my 5411 a couple of years ago, also on a CAL 2-27, after replacing the impeller and intake hose I was still overheating. Upon further inspection of the exhaust system I found that the flexible exhaust hose to and from the muffler had colapsed on the inside... there was absolutely no outward signs to indicate a problem with the hose. Jimmy 1979 CAL 2-27 Winning Bid --- In Ca… [at] yahoogroups.com, "John Boyce" <jecyob@...> wrote: > > A couple of weeks ago I wrote about my engine overheating and after several > days I thought I had limited it to a bad thermostat. I have since replaced > the thermostat, all water hoses, the pump impeller (again), pushed city > water through the thru hull and I'm still not sure what the problem is. For > one more test I connected a garden hose to the pump inlet and ran water > through the engine successfully, I didn't have a recycle stream so the > engine stayed cool with no exhaust discharge. I then put the pump suction > into a pail of water and nothing was sucked up into the engine, this seems > to indicate a bad pump but with new impeller and no leaks is this likely? > The pump is an oberdorfer, the engine is a universal 5411. IO've thought > about looking for an electric pump to try to resolve the issue but I don't > know what size to get. Any ideas? > > > > Thanks for any help > > > > John Boyce > > Cal 227 Gotcha Again >