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| 350 Cursader overheating on '67 Chris... |
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Dan Miller
New member
Username: danatvail
Post Number: 1
Registered: 11-2009
| | Posted on Monday, November 09, 2009 - 01:51 pm: | 
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The starboard engine on my 36' 1967 Constellation has always run a bit warmer than the port engine. Both engines were installed new in 1995 and have less than 800 hours on them, about 150 of those hours put on by myself over the past 30 months or so. Last week, I was out at sea, and pushed the engines up to about 3000 rpms for a very short time, and it was after that that the overheating probleb got worse. (Previous to that, all the hours for the most part were just at slow to moderate cruise. Now, even the harbor, at slow speeds, the starboard engine will overheat and the buzzer goes on, and I immediately stop the engine. A few days ago, I cruised at about 1200 rpms for a couple of hours at sea, with no problems. Oil is clean and at the proper level on both engines, bu the way. Any of you know about this? I am at danatvail@gmail.com, and my phone number is 805.249.7629. Any advise is appreciated. (By the way, I had a diver go under the boat in case a plastic bag or something was covering the thruhull intake port...he said it looked clean. |
Bondo
Senior Member
Username: bondo
Post Number: 2094
Registered: 12-2006
| | Posted on Monday, November 09, 2009 - 06:33 pm: |
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Ayuh,... Have the raw water pumps been serviced lately,...
That's where I'd start... |
W D Neal
Advanced Member
Username: chawk_man
Post Number: 263
Registered: 09-2008
| | Posted on Monday, November 09, 2009 - 07:08 pm: |
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Agree with Bondo - water pumps first. Also, thoroughly inspect hoses and intakes and pull the props to make sure you don't have junk wrapped around the shaft. The added resistance can cause overheating.
Are you using a heat exchanger(s)? If so, pull them and clean them thoroughly. If not, you may have a problem with the exhaust water jackets or risers being corroded. There are commercial cleaning and flushing kits available, but you will need to pull the boat. |
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