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freeze plug, back of head B20F

posted by  Champ 6 on  Sat Oct 1 09:59 CST 2016
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last visit: Sat Sep 18 10:02 CST 2010
[RELATED]

The latest disaster is that the plug on the back of the head popped out. I installed it, not the shop, so no one to blame but me.

Does anyone have any smart tricks for replacing this without pulling the head? I can't find a Dorman copper bolt in plug in 42 mm.








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    freeze plug, back of head B20F

    posted by  planetman on  Sat Oct 1 12:57 CST 2016
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    last visit: Fri Oct 24 09:29 CST 2014
    [RELATED]

    The only way to install the original style of plug is to pull the head.

    However, you can find an expanding rubber plug at an auto parts store or hardware store.

    Get the type that has a hex nut and not a wing nut so you can use a wrench to expand the plug.

    The freeze plug is 45mm which is a little larger than 1 3/4".

    I have several customers running around with this fix and they aren't leaking.

    Don't feel too bad as the original style of core/freeze plugs are not easy to install correctly.

    And I have repeatedly commented, I have NEVER seen any installation procedure for this style of core/freeze plug in any Volvo repair manual.

    The tools I have for installing the 3 common sizes, 35mm, 42mm and 45mm(there are 40mm, 46mm and 52mm on later Volvo engines), I cobbled together from various pieces laying around my shop. The tools I made mostly keep the sockets I use for dimpling the center in place so I can keep the sockets moving around thus making a nicer looking dimple as opposed to trying to hold the socket in my hand while hitting it with a hammer.

    But my tools don't keep me from over or under dimpling so I have whack the socket a couple of times and look to see if I think it is done.

    --
    Eric
    Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
    Torrance, CA 90502








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      freeze plug, back of head B20F

      posted by  Champ 6 on  Sat Oct 1 13:25 CST 2016
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      last visit: Sat Sep 18 10:02 CST 2010
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      Thanks, I forgot about the rubber ones. I take it that I need one to fit the diameter of the inner hole, at the lip the other plug rests on?







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        freeze plug, back of head B20F

        posted by  planetman on  Sat Oct 1 14:33 CST 2016
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        last visit: Fri Oct 24 09:29 CST 2014
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        Yes, and obviously it will be significantly smaller than 1 3/4".

        --
        Eric
        Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
        Torrance, CA 90502







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