3800 uhoh cylnder went dead
- Thread starter xierxior
- Start date
Originally posted by xierxior+May 29 2006, 02:45 AM-->
no, I inspected the head gasket rather well.. it doesn't have any sings of leaking.. what do you mean by steam cleaned? the motor has about 5000 miles or so on it.
no leakdown test I thought a compression test was enough its obveusly not holding pressure at allonly being 60 something psi
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when i pull an engine apart and one of the pistons and chambers look as clean as that compared to the others i usually find a cracked cylinder head, a cracked block, or a low spot contributing to a coolant leak into the chamber, but if the cooling system never bubbled over, then the next likely possibility on a sbc is that the coolant was leaking from the water port to the intake port (increasingly likely) with it being an end cylinder. what did the intake gaskets look like? with coolant entering the cylinder increased wear on the bore and rings can cause ring seal to go down, when you did a compression test did you shoot a tablespoon or more of oil in the spark plug hole and retest? if compression came right up close in line with the rest you need a ringjob, and the head and valves are more than likely fine.
Originally posted by Turbocharged400sbc+May 29 2006, 11:52 AM-->
no, I inspected the head gasket rather well.. it doesn't have any sings of leaking.. what do you mean by steam cleaned? the motor has about 5000 miles or so on it.
no leakdown test I thought a compression test was enough its obveusly not holding pressure at all
[snapback]127808[/snapback]
when i pull an engine apart and one of the pistons and chambers look as clean as that compared to the others i usually find a cracked cylinder head, a cracked block, or a low spot contributing to a coolant leak into the chamber, but if the cooling system never bubbled over, then the next likely possibility on a sbc is that the coolant was leaking from the water port to the intake port (increasingly likely) with it being an end cylinder. what did the intake gaskets look like? with coolant entering the cylinder increased wear on the bore and rings can cause ring seal to go down, when you did a compression test did you shoot a tablespoon or more of oil in the spark plug hole and retest? if compression came right up close in line with the rest you need a ringjob, and the head and valves are more than likely fine.
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yes, squirting some oil into the bore brought the compression back up very close to the rest of the cylnders.. I took the intake manifold to a machine shop and they told me it was warped.. that's what must have been allowing the coolent to leak into the cylnder.
lesson learned
a) never buy a used intake manifold from soneone with out having a machine shop check it to make sure its not warped.. I never bought a new intake manifold because the one I use is 800+ new
do you think I'm going to have to have the block bored or just honed?
just have the bore bottlebrush honed and throw new rings in it, it may be a good idea to throw some ID micrometer's in there to check for out of round or tappered walls
oh i know what you mean, bought the victor Jr airgap for my nova from jefferson, well i found that it had been through a nitrous explosion, it was repairable
regards, James
oh i know what you mean, bought the victor Jr airgap for my nova from jefferson, well i found that it had been through a nitrous explosion, it was repairable
regards, James
