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4.3 LX water in ignition chamber

C

Chaparral1930

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I'm getting water in a couple of the cylinders of a 1995 4.3 Vortec. The boat was running fine all summer, but one day it was running full speed and then it just started to sputter and slow down until water/oil mixture (whitish color) came out everywhere! I had the oil changed two times and it started up again, but it ran so rough that I had to turn it off. After dry-docking it and running it with a hose hooked up, I shut it off then I took the spark plugs out again and there was water in the chambers. It looked like the back two cylinders. A mechanic said its shot. Even though it has normal compression. Is it shot? Is it cheaper to rebuild or swap out to a 5.7? Thanks
 
most likely exaust manifold failure or intake manifold failure under the thermostat. you have to determine what part went bad.
 
drain the manifolds first,remove the manifolds, set in a jig level, connect a hose to the bottom inlet, slowly fill till the top of the manifolds, look for water exiting the ports
the hole under the thermostat will be plainly visable
 
Bt Doctur said:
drain the manifolds first,remove the manifolds, set in a jig level, connect a hose to the bottom inlet, slowly fill till the top of the manifolds, look for water exiting the ports
the hole under the thermostat will be plainly visable
Click to expand...

Thank you. I have to start somewhere. It seems the easiest place to start anyway.
 
Blown head gasket, intake under the thermostat as mentioned by BT, cracked head, cracked block - unless in bore unlikely to get water in combustion chamber. One could pressure test the cooling system unless you missed a leak in manifolds I think you already know it's leaking...
 
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