frustratedboater
Chief Petty Officer
- Joined
- Jul 10, 2007
- Messages
- 437
I have a PCM 350 motor in an older Mastercraft ski boat. I read another post about overheating problems and it sparked my curiosity....long story, he had rust buildup in the exhaust manifold. I had noticed when tuning my motor that the left side exhaust manifold was hotter than the right side. The right felt cool, but the left was definitely much warmer.
I ran to the back and looked down at the exhaust coming out and the "hot" side wasn't coming out as much as the right side. When I was overhauling the motor last winter, I did notice excessive rusting in the front intake manifold and certainly the thermostat neck. I scraped what I could but thought that if I am seeing it there, it must be everywhere!!
Now back to the flappers... I've never heard of such a thing and was wondering if my 1987 chevy 350cid/PCM exhaust manifolds, have flappers in the exhaust? How do I get at them? Are they designed to prevent water backflow?
It seems like my slight heating diagnosis, is due to the 'rusty blues'. Please advise,
~FB~
I ran to the back and looked down at the exhaust coming out and the "hot" side wasn't coming out as much as the right side. When I was overhauling the motor last winter, I did notice excessive rusting in the front intake manifold and certainly the thermostat neck. I scraped what I could but thought that if I am seeing it there, it must be everywhere!!
Now back to the flappers... I've never heard of such a thing and was wondering if my 1987 chevy 350cid/PCM exhaust manifolds, have flappers in the exhaust? How do I get at them? Are they designed to prevent water backflow?
It seems like my slight heating diagnosis, is due to the 'rusty blues'. Please advise,
~FB~
