Re: 1968 GMC 250 In-line 6 Rear Mail Seal
Did you polish the area of the crankshaft where the seal runs?? Did you clean the recess where the seal fits. Did you put a small amount of sealant on the area of the block between the gasket and seal?? This prevents oil from seeping between the block and main cap.. And lastly --- are you sure it's the seal that's leaking???
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