TwinTurbo.NET: Nissan 300ZX forum - 4th main bearing clearance?
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Subject 4th main bearing clearance?
     
Posted by wild_maxx on August 25, 2013 at 5:46 PM
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Message I am in the process of assembling my short block but I've run into a bit of a snag.

main bearings 1-3 are all coming out with about .0015 clearance using green plastigauge. The 4th main is showing .001 clearance which is a bit tight according to the specs.

I ordered my bearings based off of the grade stampings on the block/crank.

mains 1-3 came out fine:

 photo IMG_20130825_175341.jpg

#4 is the tight one

 photo IMG_20130825_175315.jpg

So I'm guessing the solution is to order a larger grade #4 bearing but I find it odd that its on the tight side using the stampings on the block/crank.

     
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