You should definitely be able to turn the crank and you should be able to do
it by hand (no breaker bar...I assume you have not installed the pistons and
rods yet). Did you measure the clearance under each cap? You may want to
check to make sure the surfaces where the caps and the bearings meet are
completely sanitary. The smallest amount of grease or grit could bind
things up and still give you good clearance measurements depending on where
you place the plastigauge (sp?). If it is still binding up, I would have
the crank re-checked. Maybe install the bearings and caps and measure the
bores to check for out-of-roundness. Was your block align-honed?
>-----Original Message-----
>From: Andy Cost <andycost@earthlink.net>
>To: datsun-roadsters@autox.team.net <datsun-roadsters@autox.team.net>
>Date: Friday, February 14, 2003 10:03 PM
>Subject: tight motor
>
>
>>I am in the process of assembling a u20. I had the crank ground and
>installed
>>new crank bearings. The clearance is .025mm. The manual I have gives a
>>minimum clearance of .020mm. The problem I've got is that it is
impossible
>to
>>turn the crank over by hand with a big breaker bar. Is .025mm too tight?
>The
>>crank was checked and straightened. I tried using moly assembly lube and
>when
>>it wouldn't turn over I tried Dexron. Any suggestions? Should I try to
>break
>>it in some by turning it with the caps not torqued down tight?
>>
>>Thanks,
>>
>>Andy Cost
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