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water problems

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i guess i have another problem.. i ran the boat and on a high speed pass

the water pressure started jumping around. it usually runs about 35#

over 110 mph, but was jumping down to 20# and then right back up. I

figured i blew a head gasket or something so go out of it right away and

babied it back to the dock. on checking the plugs the engine definately

had water as the plugs and pistons looked steamed cleaned. i pulled the

heads and the exhaust cover plate and just cant find a blown gasket.. can

the pan gasket leak enough to wash the cylinders? next question is once i

find my leak and fix the problem, i was going to try to get rid of some of the

water pressure so it doesnt happen again. i have the washers in the heads

that only have the 1/8" hole, i was going to make the holes 1/4" and block

one of the intake holes on the lower. i should trade this thing for a snow-

mobile because with no snow it would just sit there and i couldnt break it.



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Did any of the plugs have a milky look to them?

Look into the bores with a bore light or pull the heads and see if it looks like water got into the bores - even a fine mist.

Places to look for a water leak:

-Head Gasket.

-Exhaust Divider Plate gasket.

-Crack in exhaust chest.

We really need more info to help.

But 35psi is plenty of water pressure, Less is adequate. In many cases, 15 pounds is fine IF you have plenty of flow. You need to base pressure and flow against head temp.

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yes, i pulled the heads and the plugs. the plugs and the pistons

looked brand new, had all the carbon cleaned right off of them.

there were definately water drops in there. i cant seem to find

a bad spot in any of the gaskets. its the whole right side of the

engine that washed, so im thinking its not a head gasket.



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It looks like it is time to pull the exhaust chest divider plate off. Look for a leak in the gasket (water trails in the carbon build-up).

Look for a VERY small crack in the divider plate or in the chest. If a crack develops, a fine mist of water will get into the chest and vaporize. This vapor will be pushed into the cylinder during reversion in the chest.

Also look into the tuner/adapter plate for tell-tale signs of water.

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