I like my subaru but head gasket have used the sealant no problem yet

Discussion in 'General Motoring' started by sheps58, Jan 27, 2005.

  1. sheps58

    sheps58 Guest

    Has Subaru corrected the head gasket problem and how did they correct the
    problem on the new subarus. How many miles do people have on the 2.5
    engine. Any one with more than 150000 miles?
    sheps58, Jan 27, 2005
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  2. sheps58

    George Adams Guest

    187,000 when the gasket let go. Repaired by independent local shop, now
    have 212,000 with no further problems.
    George Adams, Jan 27, 2005
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  3. sheps58

    MN Guest

    Here is some very interesting info on how to fix the problem yourself:

    MN, Jan 28, 2005
  4. sheps58

    CompUser Guest

    CompUser, Jan 28, 2005
  5. sheps58

    John O Guest

    Not being a mechanic...does anyone have a photo of this?

    -John O
    John O, Jan 28, 2005
  6. The theory behind that is that air gets trapped at the highest point of the
    cooling system inside the engine and that getting rid of that air will eliminate
    a possible local coolant boil that - through its expanding gas bubble - blocks
    the heat transfer. This in turn accelerates the phenomenon and the engine
    overheats, may even warp and blow its gaskets.

    In this theory, blown gaskets are the consequence not the cause of the issue.
    This may be possible, since many many 2.5 engines of identical design do NOT
    blow their gaskets - they may just have been properly bled of air inside the
    cooling system.

    My concern with the solution posted is, that by connecting a pipe into the
    coolant flow inside the engine, you disturb the flow surface and create a
    potential nucleus for cavitation. This may cause the exact problem the device is
    supposed to eliminate. IMO, It would be a good idea to first examine the rate at
    which the coolant flows in that area.

    florian /FFF/
    Florian Feuser /FFF/, Jan 28, 2005
  7. This is an odd question, and is prompted by one reference I read on the
    'net - I know dangerous - but that is why I'm asking. Is it true that
    Subaru at one time or at present routes coolant INTO the radiator at the
    bottom and OUT to the engine from the top? If this were true it seems it
    would be a source for air getting 'gulped' into the coolant system.

    1 Lucky Texan
    Carl 1 Lucky Texan, Jan 28, 2005
  8. sheps58

    T Guest

    If this is what I think it is it's the coolant expansion tank in modern
    coolant systems.

    Old sealed systems had an expansion tank built into the end caps, and
    you filled directly through a cap in the radiator.

    Later systems have a few hoses and a bottle with a cap, this is the high
    point of the coolant system and is likely what the guy is calling a

    Since all the coolant passes though the expansion tank it is likely the
    bubbles will eventually get passed out and remove themselves from the block.

    From my experiences with VW inline motors there is a real concern when
    refilling the motor to avoid bubbles in the block and refilling via the
    'top' coolant hose is key. It's also called backfilling.

    If what the link mentions is true then getting all the trapped air out
    is key, and keeping any that gets in from remaining is beneficial.

    T, Jan 31, 2005
  9. sheps58

    T Guest

    I found out a 'swirl tank' is not exactly the same as an expansion tank.

    It has an intake and an outlet where the coolant flows into a
    (cylindrical?) tank before going on to other, more common parts of the
    system like expansion tank, radiator, and/or overflow catch bottle.

    It enters at an angle, causing the 'swirl'.

    Now, what possible reason you would want one still remains a mystery to
    me, but Google will find a few links if it's really interesting to
    explore further.

    T, Feb 2, 2005
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