Re: [Cal_Boats] Strange engine problem

Did you check impeller? I have killed more than one by forgetting to open thru hull. Allen Edwards <al… [at] gmail.com> wrote: >It is a raw water cooled engine. As it has been fine for over a year I am >thinking wondering what was different this time. Thanks to a chat with >Chris123 I am thinking it was something like this: >1) Start the engine at low RPM. Forgot to check stern for flow. (Mistake >one and two) >2) Pump did not have flow as it needs a little kick of RPM to prime it >3) Overheat and alarm >4) Checked oil pressure and increased RPM creating flow >5) Check stern and see flow and steam >6) Check head which had just been cooled by the sea water now flowing >through it. > >But I don't really remember the sequence of events, when I increased the >RPM and when I checked the exhaust. This I guess is a best case >explanation so I hope it is correct. The only problem is that if the head >overheated, I would think it would have been at least as hot as the engine >is when warmed up and it was not. > >In the past I have had trouble with pumps not drawing prime, particularly >pumps from this rebuilder. I think I mentioned in another thread that I >had been using Depco pumps but with the rebuild that is no longer the case. > Increasing the RPM at start, which I typically do, helps to get prime. > >They say that failures are usually a combination of things, not just one. > If it happened like I am saying, it would be a combination of not giving >the engine enough RPM at start and not checking the stern for water. I >usually do both of these things. > >Allen > > >On Wed, Jul 24, 2013 at 6:46 AM, r good <my… [at] hotmail.com> wrote: > >> ** >> >> >> bad typing and no spell check! >> Reggie >> >> ------------------------------ >> To: ca… [at] yahoogroups.com >> From: my… [at] hotmail.com >> Date: Wed, 24 Jul 2013 07:44:31 -0600 >> Subject: RE: [Cal_Boats] Strange engine problem >> >> >> >> haust hose replaced when engine rebuilt? inside layer of exhaust howe >> can crack, delaminate, and create flaps which may/will get in the way of >> flow.. The hose looks great on the outside, but... >> Reggie >> >> ------------------------------ >> To: Ca… [at] yahoogroups.com >> From: al… [at] gmail.com >> Date: Tue, 23 Jul 2013 23:45:43 -0700 >> Subject: [Cal_Boats] Strange engine problem >> >> >> Coming back from a race tonight the engine alarm went off. I checked >> the oil pressure and it was OK. Then I checked the exhaust and saw both >> steam and lots of water. I increased the revs and the alarm quit. My plan >> is to take the water pump apart and flush the engine. This is a Gary >> marine rebuilt a year and a half ago. I also felt the head and I could >> easily put my hand on it, it was not hot. But something was making the >> steam as when I looked after the alarm went off things looked normal -- no >> steam. >> >> Anyone have any ideas what could be going on? >> >> Allen >> >> >> >> >> >>

I will check it tomorrow. On Wed, Jul 24, 2013 at 8:46 AM, Bruce Boyles <br… [at] yahoo.com>wrote: > ** > > > Did you check impeller? I have killed more than one by forgetting to open > thru hull. > > > Allen Edwards <al… [at] gmail.com> wrote: > > > > It is a raw water cooled engine. As it has been fine for over a year I am > thinking wondering what was different this time. Thanks to a chat with > Chris123 I am thinking it was something like this: > 1) Start the engine at low RPM. Forgot to check stern for flow. (Mistake > one and two) > 2) Pump did not have flow as it needs a little kick of RPM to prime it > 3) Overheat and alarm > 4) Checked oil pressure and increased RPM creating flow > 5) Check stern and see flow and steam > 6) Check head which had just been cooled by the sea water now flowing > through it. > > But I don't really remember the sequence of events, when I increased the > RPM and when I checked the exhaust. This I guess is a best case > explanation so I hope it is correct. The only problem is that if the head > overheated, I would think it would have been at least as hot as the engine > is when warmed up and it was not. > > In the past I have had trouble with pumps not drawing prime, particularly > pumps from this rebuilder. I think I mentioned in another thread that I > had been using Depco pumps but with the rebuild that is no longer the case. > Increasing the RPM at start, which I typically do, helps to get prime. > > They say that failures are usually a combination of things, not just one. > If it happened like I am saying, it would be a combination of not giving > the engine enough RPM at start and not checking the stern for water. I > usually do both of these things. > > Allen > > > On Wed, Jul 24, 2013 at 6:46 AM, r good <my… [at] hotmail.com> wrote: > >> ** >> >> >> bad typing and no spell check! >> Reggie >> >> ------------------------------ >> To: ca… [at] yahoogroups.com >> From: my… [at] hotmail.com >> Date: Wed, 24 Jul 2013 07:44:31 -0600 >> Subject: RE: [Cal_Boats] Strange engine problem >> >> >> >> haust hose replaced when engine rebuilt? inside layer of exhaust howe >> can crack, delaminate, and create flaps which may/will get in the way of >> flow.. The hose looks great on the outside, but... >> Reggie >> >> ------------------------------ >> To: Ca… [at] yahoogroups.com >> From: al… [at] gmail.com >> Date: Tue, 23 Jul 2013 23:45:43 -0700 >> Subject: [Cal_Boats] Strange engine problem >> >> >> Coming back from a race tonight the engine alarm went off. I checked >> the oil pressure and it was OK. Then I checked the exhaust and saw both >> steam and lots of water. I increased the revs and the alarm quit. My plan >> is to take the water pump apart and flush the engine. This is a Gary >> marine rebuilt a year and a half ago. I also felt the head and I could >> easily put my hand on it, it was not hot. But something was making the >> steam as when I looked after the alarm went off things looked normal -- no >> steam. >> >> Anyone have any ideas what could be going on? >> >> Allen >> >> >> >> >> > >