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Thread: Valve cover bolt head size 3.9 L V8

  1. 29th November 2017, 09:58 PM #1
    Neo Guest

    Question Valve cover bolt head size 3.9 L V8

    I've noticed on my 1996 Discovery 1 that one of the valve cover bolts is loose however I don't have a socket to fit it. So what size and type of socket do I need. It looks like a bi hex socket head. But I'm not sure.
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  2. 29th November 2017, 10:03 PM #2
    trout1105's Avatar
    trout1105
    trout1105 is offline OldBushie Supporter
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    8 mil I think
    You only get one shot at life, Aim well

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  3. 29th November 2017, 10:21 PM #3
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    bee utey
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    Quote Originally Posted by trout1105 View Post
    8 mil I think
    Correct. Double hex sockets aren't all that common but you'll find one eventually. I bought mine from the UK via ebay. Needs to be 1/4" drive. Sometimes you can tighten the outer bolts using a small ring spanner, 5/16" is the same size.
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