Re: Water in cylinders
Quick Question,
Why is it that we are trying to cool exhaust gases. This causes alot of problems that could be allieviated by custom headers or other means of exhaust system and ventillation. Is it because of heat build up in engine compartment? Im just curious. Im a car guy, dont know much about boats.
Well, for one....the exhaust system would overheat quickly and cause a fire in an enclosed engine compartment.
ALL custom headers and other exhaust systems for marine applications in covered engine compartments are (water) jacketed.
The guy that sold me the boat said the manifolds where brand new. Yeah, brand new paint. How do you test the manifold itself for leaks into the exhaust channel?
Yeah, they always say that don't they?
Have a look at the top of the message list in the forum. There's some info there on how to test manifolds using acetone.
You can sometimes determine how rusty they are by removing the risers from the manifolds and just looking.
Fresh water manifolds last a fair long time. If the boat is operated in salt, they can be junk in 5 years or so..... Some people pull the risers every 2 or 3 years to inspect when they operate in salt water...
You should probably see steam coming from the exhaust. The water is mixed with exhaust at the end of the risers.
You should never have water in the cyls after shut down.
If you do, the risers, manifolds, gaskets etc may be leaking.
Sometimes "dieseling" can happen if you have carbon build-up on the pistons, plugs, valves, or other place in the combustion chamber.
If that carbon "spot" is glowing when you shut down, it can act like a glow-plug and keep the engine turning or cause it to turn the wrong way.
If the engine was running really hot (severely retarded timing etc) it could also "diesel" ......... It doesn't sound like you have that problem.
