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  1. #1
    Kristian Keppel Waterholics's Avatar
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    Oil building up in coolant bottle

    My friends 07 RXP is having some problems with his RXP only building oil pressure in the coolant bottle. They pressure tested the head, shaved the head, and changed head gasket. What could possibly be causing this problem ?


  2. #2
    83.0 @ 8400 jhill19's Avatar
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    Oil building up in coolant bottle

    Oil cooler

  3. #3
    Kristian Keppel Waterholics's Avatar
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    Oh sorry. Thay also changed the oil cooler.

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    83.0 @ 8400 jhill19's Avatar
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    Oil building up in coolant bottle

    Crack in one of the coolant passages on the block.

  5. #5
    Moderator beerdart's Avatar
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    water pump seal.

  6. #6
    www.eastcoastpwc.net Scott's Avatar
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    Oil building up in coolant bottle

    Quote Originally Posted by beerdart View Post
    water pump seal.
    Yupper. Good old rotary seal and oil seal

  7. #7
    SLASHER's Avatar
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    Water pump seal ... +1

  8. #8
    JeffSki's Avatar
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    Ever find out the problem??? I doubt it was the water/oil pump seals.

  9. #9
    Kristian Keppel Waterholics's Avatar
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    No it wasn't. Never found out the problem.

  10. #10
    It cannot be the water pump seals. There is a weep hole between the oil and coolant seals so the "twain shall never meet".

    I just responded to your PM. It doesn't take much for a head gasket to leak, you could have a low area between the coolant and oil holes that may not be easily seen. A plate contact test using a granite surface plate and Dykem blue would show you if you have low areas on the head side (could be done on block side as well with a lot more work!). And if you pull the head, most competent head shops have pressure testing equipment to test for a leak between oil and coolant areas. Checking the integrity of the block would be hardest, both on the head gasket surface and the interior passages.

    One thing to note. Casting aluminum blocks and heads is an art. Aluminum often casts with porosity, so it is more likely to have a void (air bubble during casting) than a crack in the block. This could be your cause, but check out the other areas first.

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