Crankshaft bearing help.

[calibay]

So I've measured my crankshaft and I have got, 39.93' 54.9, 54.94, 54.9.

Are these within allowable range, I've just bought a set of standard bearings, my engine guy seems to think that they are perfectly fine but I thought I'd ask the forum for a second opinion

 

[tomedwar72]

From VW "Without Guesswork":

Crankshaft Wear Limit / Tolerance (mm)
Main Journals 1-3 ; 54.97 - 54.99
Main Journal 4 ; 39.98 - 40.00

http://www.thesamba.com/vw/archives/manuals/1971withoutguesswork/6_7.jpg
http://www.thesamba.com/vw/archives/manuals/1971withoutguesswork.php

It might depend on the precision of your measurements, they are a wee bit outside the VW wear limit. How much this matters I can't say.

 

[calibay]

I feared this was the case, it looked like I may be on the phone to machine 7 in the morning buying a new crank!

 

[tomedwar72]

You could always get it reground another 0.25mm there are plenty of main bearing sets for this spec and you have another 2 steps of regrind left before it falls out of spec. The quality of an original crank may be better than an aftermarket one assuming the run-out is fine. Of course, buying new means you can step up to a forged counterweighted crank if you want.

 

[calibay]

Thanks for the help, I've bought a new vw original crank, I was lying in bed thinking about it so I bit the bullet