Re: [Cal_Boats] Engine cooling problem

Terry Spencer <ts… [at] harbornet.com> wrote: >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 >> >> >> >> >

I was looking at an outboard repair site and they stressed the importance of checking the rubber impellers in cooling systems, that they can become hardened and brittle by just sitting around. Is it possible that revving up the motor improves the seal on the impeller blades? I know its time for me to replace mine, I guess it's been four or five years now-wow how time flies-and I'd rather not throw a blade, block the pump outlet channel and seize me motor again, me OB might not have nine lives. I wonder, is there one impeller maker better than others? Jerry-Cal 24 Classic From: Geneu <ca… [at] yahoo.com> To: Ca… [at] yahoogroups.com Sent: Friday, August 2, 2013 10:46 AM Subject: Re: [Cal_Boats] Engine cooling problem Terry Spencer <ts… [at] harbornet.com> wrote: >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 >> >> >> >> >

Thanks again for all of the ideas on my overheating problem, I now have a new problem … straightening a 65 year old back after 3 hours in the bowels of the boat! After investigating all of the hoses etc on the water system and replacing most of them, a job I have been intending to do for some time I found no problem, but after running the engine for over 30 minutes there is no sign of overheating but the long non-funtioning thermostat seems to be working. I think what happened was that the inlet thru hull became plugged by sea weed, the engine overheated and water pressure relief valve (I never knew that there was one on the boat) popped. After I stopped the blockage went away, possibly due to steam pressure. During this time whatever was holding the thermostat open and keeping the engine running at below normal temperature was released. Subsequently when I restarted the engine I saw the temperature rise, which I was not used to, and panicked (or behaved in a prudent but erroneous manner) and cut back the throttle which lowered the temperature. I this sounds like a convoluted series of events but it seems to fit the facts, “…when all other possibilities are disproven, the remaining explanation no matter how illogical must be the answer. Sherlock Holmes” or at least its good fiction. Thanks again to all John Boyce Gotcha Again Cal 227 #650 From: Ca… [at] yahoogroups.com [mailto:Ca… [at] yahoogroups.com] On Behalf Of Gerald Sobel Sent: Friday, August 02, 2013 1:57 PM To: Ca… [at] yahoogroups.com Subject: Re: [Cal_Boats] Engine cooling problem I was looking at an outboard repair site and they stressed the importance of checking the rubber impellers in cooling systems, that they can become hardened and brittle by just sitting around. Is it possible that revving up the motor improves the seal on the impeller blades? I know its time for me to replace mine, I guess it's been four or five years now-wow how time flies-and I'd rather not throw a blade, block the pump outlet channel and seize me motor again, me OB might not have nine lives. I wonder, is there one impeller maker better than others? Jerry-Cal 24 Classic _____ From: Geneu <ca… [at] yahoo.com> To: Ca… [at] yahoogroups.com Sent: Friday, August 2, 2013 10:46 AM Subject: Re: [Cal_Boats] Engine cooling problem Terry Spencer <ts… [at] harbornet.com <mailto:tspencer%40harbornet.com> > wrote: >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:Cal_Boats%40yahoogroups.com> [mailto:Ca… [at] yahoogroups.com <mailto:Cal_Boats%40yahoogroups.com> ] On Behalf Of John Boyce >> Sent: Thursday, August 01, 2013 6:02 PM >> To: Ca… [at] yahoogroups.com <mailto:Cal_Boats%40yahoogroups.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:Cal_Boats%40yahoogroups.com> [mailto:Ca… [at] yahoogroups.com <mailto:Cal_Boats%40yahoogroups.com> ] On Behalf Of Joe DeMers >> Sent: Thursday, August 01, 2013 6:51 AM >> To: Ca… [at] yahoogroups.com <mailto:Cal_Boats%40yahoogroups.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 >> >> >> >> >