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  1. #1
    Jay Reed's Avatar
    Jay Reed Guest

    Default I was hoping someone could det

    I was hoping someone could detail how to pressure test exhaust manifold/cooling system. I have water in crankcase. engine still seems to run fine/have good power. am I right to suspect exhaust manifold/gasket? then head or head gasket. cracked block. any other possibilities? I spent the last couple of days reading this board. its a great resource. thanks. -jay

    1995 4.3 gen 2 drive (freshwater)

  2. #2
    Join Date
    Aug 2006
    Calgary, Alberta, Canada

    Default "First suspect: manifolds &

    "First suspect: manifolds & risers
    Second Suspect: head gasket
    Third Suspect: Cracked block (if it froze, move this to #1)

    You can remove the manifolds to test. Plug the inlet water fitting and fill with water. Look for any water leaking into the exhaust passages.

    If they check out, plug the water outlet and inlet fittings at the T stat housing and pressure test the block. It should hold 10-15 psig for at least an hour.

    How many hours on the engine?
    I see its fresh water, which is usually easy on manifolds/risers.
    Has it ever been overheated?


  3. #3
    Jay Reed's Avatar
    Jay Reed Guest

    Default "thanks rod engine has about

    "thanks rod
    engine has about 900-1000 hours (meter stopped working a few years back at 703). engine did over heat earlier this year. suspected impeller even though it was only a year old, on inspection it was fine, mechanic replaced anyway, said there was some sort of blockage, (mouse nest?) that he got flushed out. no longer over heating but grey/milky oil... my first thought was head or head gasket. after reading here I guess I will try manifold/riser gasket. -jay"

  4. #4
    Join Date
    Aug 2006
    Calgary, Alberta, Canada

    Default "Maybe try pulling the plugs a

    "Maybe try pulling the plugs and check them.
    Water in the combustion chamber will make them very light, almost white. Could be a clue.

    With that many hours it could easily be a head gasket, or manifolds.


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