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Buick 225 V-6 Coolant Leak

Discussion in 'Early CJ5 and CJ6 Tech' started by Simi Valley CJ-5, Apr 17, 2019.

  1. Apr 17, 2019
    Simi Valley CJ-5

    Simi Valley CJ-5 New Member

    Simi Valley, CA
    Joined:
    Jul 8, 2008
    Messages:
    42
    My dauntless has a coolant leak near the timing chain cover.
    Has anyone else experienced this sort of leak? if so, what was the cause?
     
  2. Apr 18, 2019
    y2grey

    y2grey Member

    Fayetteville NY
    Joined:
    Sep 18, 2011
    Messages:
    73
    I get coolant pooling there also. Mine pools towards the block and not the water pump.
     
  3. Apr 18, 2019
    47v6

    47v6 junk wrecker! Sponsor

    Washington DC.
    Joined:
    Oct 25, 2006
    Messages:
    4,607
    I cant tell precisely where its coming from, but that's bad.

    The aluminum thermostat cover/filler neck gets pitted from the inside and cam have pinholes. I would start there. If its a gasket, you're going to replace it anyway when you inspect it. Pull it apart and find where the leak is coming from.
     
  4. Apr 18, 2019
    jpflat2a

    jpflat2a what's that noise?

    Riverside CA
    Joined:
    Jul 30, 2003
    Messages:
    7,818
    It could be a bad timing cover gasket and/or timing cover that has corroded in that water jacket area.
    I've seen that before. Maybe put a pressure test on the system and GENTLY try snugging up the cover bolts.
     
    Vanguard and 47v6 like this.
  5. Apr 23, 2019
    wasillashack

    wasillashack Member

    Wasilla, Alaska
    Joined:
    Mar 17, 2008
    Messages:
    189
    Pitting from corrosion on the thermostat housing and heater hose bibs will sometimes allow leaks. Thermostat housings will leak at the gasket surface from pitting, incorrect thermostat installation or warping. Screw type hose clamps are known failure points also, when hoses get older and less flexible. A screw type hose clamp will lose it's sealing pressure, the spring type (flat metal or wire type) that are installed with pliers maintain sealing pressure when hoses lose their elasticity. Good luck!
     

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