Question about 1994 GMC Sierra

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Replaced rear main seal on 5.7 but still seems to be leaking. Any suggestions?

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  • GMC Master
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Be sure it is the rear main seal,there is a cam plug that could be leaking,but if it is the rear main oil seal leaking,then I suggest removing it,and installing a rear main repair sleeve,this will give it a new surface to ride on,the crankshaft may have a groove cut into it from the oil seal,this will remedy the problem.If this was at all helpful,please rate,thank you.

Posted on Jul 10, 2010

  • wolds99 Jul 19, 2010

    where is this elusive cam plug?

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 19, 2010

    The cam plug is up above the crank shaft seal.

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    88143g59.gif Crankshaft rear main seal - 5.7L engine

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    88143g60.gif Exploded view of the rear main seal installation - 3.4L engine
    Click to Enlarge

    1. Tighten the wing nut on the installation tool until it bottoms out.
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    88143g61.gif Rear main seal and installation tool - 3.8L engine
    Click to Enlarge
    88143g62.gif After position the seal on the tool, install it to the crankshaft housing

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