Engine cooling problem

On the way out to tonight's race I ran through some sea weed. It didn't seem to be a problem but a few minutes later my engine overheats. I checked the water strainer, water intake line and engine impeller. Everything seemed clear. I found that of I kept the rpm's medium to slow the engine did not overheat. At full throttle the temperature went up. Tomorrow I plan to replace hoses and the thermostat as well as further check the thru hull. Anyone have any other ideas? BTW the race was cancelled which left us in first place for the series. John B CAl 227 #650

Sounds like the problem I am having. I re-propped to a 3 blade for more power when motoring to windward. With a two blade, and the chop we experience in the Neuse river, 3’ swells less than 2 boat lengths a part, we would slam into every third wave and practically stop the boat. With a three blade, we still hit the third wave but the prop gets us back to speed quicker. I noticed the past weekend, we were motoring to windward in fairly flat seas. Trying to maintain max speed 6kn or so. After about 30 min, the over temp buzzer sounded. Dropped the rpm to about 2500 rpm or 5 and half knots, we motored on. I think we have an over propped issue. Not going to change anything at the moment though, just need to keep the rpm’s down and don’t get in a hurry! For some reason the engineers at yanmar designed the tack to read 2000 rpm to be straight up on the tack! It seems to run best at this speed and cruses at about 5 ½ knots in flat water. I am not really OCD but it works! TYMLL John From: Ca… [at] yahoogroups.com [mailto:Ca… [at] yahoogroups.com] On Behalf Of John b Sent: Wednesday, July 31, 2013 9:34 PM To: Ca… [at] yahoogroups.com Subject: [Cal_Boats] Engine cooling problem On the way out to tonight's race I ran through some sea weed. It didn't seem to be a problem but a few minutes later my engine overheats. I checked the water strainer, water intake line and engine impeller. Everything seemed clear. I found that of I kept the rpm's medium to slow the engine did not overheat. At full throttle the temperature went up. Tomorrow I plan to replace hoses and the thermostat as well as further check the thru hull. Anyone have any other ideas? BTW the race was cancelled which left us in first place for the series. John B CAl 227 #650

You may have weed on your prop, rudder, etc. Joe D On 7/31/2013 9:33 PM, John b wrote: > > > On the way out to tonight's race I ran through some sea weed. It > didn't seem to be a problem but a few minutes later my engine > overheats. I checked the water strainer, water intake line and engine > impeller. Everything seemed clear. I found that of I kept the rpm's > medium to slow the engine did not overheat. At full throttle the > temperature went up. Tomorrow I plan to replace hoses and the > thermostat as well as further check the thru hull. > > Anyone have any other ideas? > > BTW the race was cancelled which left us in first place for the series. > > John B > CAl 227 #650 > > > > > > No virus found in this message. > Checked by AVG - www.avg.com <http://www.avg.com> > Version: 2013.0.3392 / Virus Database: 3209/6541 - Release Date: 07/31/13 > -- *Joe DeMers - owner* Sound Marine Diesel LLC SoundMarineDiesel.com <http://www.soundmarinediesel.com/> *phone & fax (860) 666-2184*

You could have weed plugging part of the through hull that hasn't made it up the line or the strainer. On Wed, Jul 31, 2013 at 9:33 PM, John b <je… [at] gmail.com> wrote: > ** > > > On the way out to tonight's race I ran through some sea weed. It didn't > seem to be a problem but a few minutes later my engine overheats. I > checked the water strainer, water intake line and engine impeller. > Everything seemed clear. I found that of I kept the rpm's medium to slow > the engine did not overheat. At full throttle the temperature went up. > Tomorrow I plan to replace hoses and the thermostat as well as further > check the thru hull. > > Anyone have any other ideas? > > BTW the race was cancelled which left us in first place for the series. > > John B > CAl 227 #650 > > >

Thanks to everyone who has replied, today I went to the boat and checked the intake to be sure there was no blockage, checked out fine, replaced all suction side water hoses just in case they were collapsing. I have had a bad thermostat, stuck open, so I tried to change that but brass screws with slotted heat are not a good idea, especially with limited access as I result I could not change it. At the end of the day it still seems like the engine is getting hot at high RPM's I will admit that I chickened out before the temperature got too high and let the engine cool down. I think the exhaust sound has changed it seems like there is more of a high velocity jet sound but this may be because I am running at high speed in my slip with my head over the transom. Any new ideas, I'll be back at it tomorrow. Don't want to waste a good season, 11 starts 10 firsts 1 second! John B Cal227 #650 From: Ca… [at] yahoogroups.com [mailto:Ca… [at] yahoogroups.com] On Behalf Of Joe DeMers Sent: Thursday, August 01, 2013 6:51 AM To: Ca… [at] yahoogroups.com Subject: Re: [Cal_Boats] Engine cooling problem You may have weed on your prop, rudder, etc. Joe D On 7/31/2013 9:33 PM, John b wrote: On the way out to tonight's race I ran through some sea weed. It didn't seem to be a problem but a few minutes later my engine overheats. I checked the water strainer, water intake line and engine impeller. Everything seemed clear. I found that of I kept the rpm's medium to slow the engine did not overheat. At full throttle the temperature went up. Tomorrow I plan to replace hoses and the thermostat as well as further check the thru hull. Anyone have any other ideas? BTW the race was cancelled which left us in first place for the series. John B CAl 227 #650 No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.3392 / Virus Database: 3209/6541 - Release Date: 07/31/13 -- Joe DeMers - owner Sound Marine Diesel LLC <http://www.soundmarinediesel.com/> SoundMarineDiesel.com phone & fax (860) 666-2184

Have not followed this thread that close, but perhaps can offer something no one else has. Check the outgoing side. A few years back I have a overheating problem that resulted in the 9 inch hose from exit to the muffler had collapsed inward . It was a internal double hose, so from the outside it appears just fine, but when taken off you can see that inside it collapsed in a few areas preventing good flow outward. Changed it out and problem went away. Good luck. Nick From: "John Boyce" <je… [at] gmail.com> To: "Cal Boats" <Ca… [at] yahoogroups.com> Sent: Thursday, August 1, 2013 6:02:07 PM Subject: RE: [Cal_Boats] Engine cooling problem Thanks to everyone who has replied, today I went to the boat and checked the intake to be sure there was no blockage, checked out fine, replaced all suction side water hoses just in case they were collapsing. I have had a bad thermostat, stuck open, so I tried to change that but brass screws with slotted heat are not a good idea, especially with limited access as I result I could not change it. At the end of the day it still seems like the engine is getting hot at high RPM’s I will admit that I chickened out before the temperature got too high and let the engine cool down. I think the exhaust sound has changed it seems like there is more of a high velocity jet sound but this may be because I am running at high speed in my slip with my head over the transom. Any new ideas, I’ll be back at it tomorrow. Don’t want to waste a good season, 11 starts 10 firsts 1 second! John B Cal227 #650 From: Ca… [at] yahoogroups.com [mailto:Ca… [at] yahoogroups.com] On Behalf Of Joe DeMers Sent: Thursday, August 01, 2013 6:51 AM To: Ca… [at] yahoogroups.com Subject: Re: [Cal_Boats] Engine cooling problem You may have weed on your prop, rudder, etc. Joe D On 7/31/2013 9:33 PM, John b wrote: On the way out to tonight's race I ran through some sea weed. It didn't seem to be a problem but a few minutes later my engine overheats. I checked the water strainer, water intake line and engine impeller. Everything seemed clear. I found that of I kept the rpm's medium to slow the engine did not overheat. At full throttle the temperature went up. Tomorrow I plan to replace hoses and the thermostat as well as further check the thru hull. Anyone have any other ideas? BTW the race was cancelled which left us in first place for the series. John B CAl 227 #650 No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.3392 / Virus Database: 3209/6541 - Release Date: 07/31/13 -- Joe DeMers - owner Sound Marine Diesel LLC SoundMarineDiesel.com phone & fax (860) 666-2184

Ok, here is another check, may or may not be relevant since I did not observe the overheat issue on our boat. The outlet from the water pump, also feeds into the exhaust elbow at the back of the engine. At some point I had a issue with the water not getting injected into the outflow of the exhaust, so I started checking where the stoppage occurred. The inside of the exhaust elbow had rusted to the point of blocking the line. A small screwdriver was able to clear the blockage, and the system seemed to work as "normal". Research into the system, Yanmar recommends replacement of the exhaust elbow on a 5 year interval. If you see signs of rust on the outside, it is well past time to change it out. I can envision a scenario where at high RPM the water flow is blocked to cause over heating, but at low RPM and less load on the engine, the water flow even restricted would keep the engine below the "overheat" warning. YMMV JOhn From: Ca… [at] yahoogroups.com [mailto:Ca… [at] yahoogroups.com] On Behalf Of John Boyce Sent: Thursday, August 01, 2013 6:02 PM To: Ca… [at] yahoogroups.com Subject: RE: [Cal_Boats] Engine cooling problem Thanks to everyone who has replied, today I went to the boat and checked the intake to be sure there was no blockage, checked out fine, replaced all suction side water hoses just in case they were collapsing. I have had a bad thermostat, stuck open, so I tried to change that but brass screws with slotted heat are not a good idea, especially with limited access as I result I could not change it. At the end of the day it still seems like the engine is getting hot at high RPM's I will admit that I chickened out before the temperature got too high and let the engine cool down. I think the exhaust sound has changed it seems like there is more of a high velocity jet sound but this may be because I am running at high speed in my slip with my head over the transom. Any new ideas, I'll be back at it tomorrow. Don't want to waste a good season, 11 starts 10 firsts 1 second! John B Cal227 #650 From: Ca… [at] yahoogroups.com [mailto:Ca… [at] yahoogroups.com] On Behalf Of Joe DeMers Sent: Thursday, August 01, 2013 6:51 AM To: Ca… [at] yahoogroups.com Subject: Re: [Cal_Boats] Engine cooling problem You may have weed on your prop, rudder, etc. Joe D On 7/31/2013 9:33 PM, John b wrote: On the way out to tonight's race I ran through some sea weed. It didn't seem to be a problem but a few minutes later my engine overheats. I checked the water strainer, water intake line and engine impeller. Everything seemed clear. I found that of I kept the rpm's medium to slow the engine did not overheat. At full throttle the temperature went up. Tomorrow I plan to replace hoses and the thermostat as well as further check the thru hull. Anyone have any other ideas? BTW the race was cancelled which left us in first place for the series. John B CAl 227 #650 No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.3392 / Virus Database: 3209/6541 - Release Date: 07/31/13 -- Joe DeMers - owner Sound Marine Diesel LLC <http://www.soundmarinediesel.com/> SoundMarineDiesel.com phone & fax (860) 666-2184

And there is a smaller outlet tube leading off the exhaust elbow on the Yanmar that can also clog up. Same fix with a screwdriver. Terry On Aug 2, 2013, at 3:02 AM, john raxter wrote: > > Ok, here is another check, may or may not be relevant since I did not observe the overheat issue on our boat. The outlet from the water pump, also feeds into the exhaust elbow at the back of the engine. At some point I had a issue with the water not getting injected into the outflow of the exhaust, so I started checking where the stoppage occurred. The inside of the exhaust elbow had rusted to the point of blocking the line. A small screwdriver was able to clear the blockage, and the system seemed to work as “normal”. > > > > Research into the system, Yanmar recommends replacement of the exhaust elbow on a 5 year interval. If you see signs of rust on the outside, it is well past time to change it out. > > > > I can envision a scenario where at high RPM the water flow is blocked to cause over heating, but at low RPM and less load on the engine, the water flow even restricted would keep the engine below the “overheat” warning. > > > > YMMV > > > > JOhn > > > > From: Ca… [at] yahoogroups.com [mailto:Ca… [at] yahoogroups.com] On Behalf Of John Boyce > Sent: Thursday, August 01, 2013 6:02 PM > To: Ca… [at] yahoogroups.com > Subject: RE: [Cal_Boats] Engine cooling problem > > > > > > Thanks to everyone who has replied, today I went to the boat and checked the intake to be sure there was no blockage, checked out fine, replaced all suction side water hoses just in case they were collapsing. > > > > I have had a bad thermostat, stuck open, so I tried to change that but brass screws with slotted heat are not a good idea, especially with limited access as I result I could not change it. > > > > At the end of the day it still seems like the engine is getting hot at high RPM’s I will admit that I chickened out before the temperature got too high and let the engine cool down. I think the exhaust sound has changed it seems like there is more of a high velocity jet sound but this may be because I am running at high speed in my slip with my head over the transom. > > > > Any new ideas, I’ll be back at it tomorrow. Don’t want to waste a good season, 11 starts 10 firsts 1 second! > > > > John B > > Cal227 #650 > > > > From: Ca… [at] yahoogroups.com [mailto:Ca… [at] yahoogroups.com] On Behalf Of Joe DeMers > Sent: Thursday, August 01, 2013 6:51 AM > To: Ca… [at] yahoogroups.com > Subject: Re: [Cal_Boats] Engine cooling problem > > > > > > You may have weed on your prop, rudder, etc. > > Joe D > > On 7/31/2013 9:33 PM, John b wrote: > > > > On the way out to tonight's race I ran through some sea weed. It didn't seem to be a problem but a few minutes later my engine overheats. I checked the water strainer, water intake line and engine impeller. Everything seemed clear. I found that of I kept the rpm's medium to slow the engine did not overheat. At full throttle the temperature went up. Tomorrow I plan to replace hoses and the thermostat as well as further check the thru hull. > > Anyone have any other ideas? > > BTW the race was cancelled which left us in first place for the series. > > John B > CAl 227 #650 > > > > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2013.0.3392 / Virus Database: 3209/6541 - Release Date: 07/31/13 > > > > -- > > Joe DeMers - owner > > Sound Marine Diesel LLC > > SoundMarineDiesel.com > > phone & fax (860) 666-2184 > > > >