When I pulled my 100K+ U20 apart the crank was still in spec and all I did
was polish it before putting in new std. Bearings and doing the rest of the
rebuild. I just took another 100K U20 apart this weekend - std. Bearings
and they looked good. I don't have anywhere near Les's level of experience
with these things but in my experience the bottom ends are bullet proof. If
yours has bearing problems I would suspect lubrication problems caused it
and would want to rebuild at least the bottom end - Including a new oil
pump.
Consider your mileage too - If you just throw bearings in it, you may have
other problems coming soon. The timing components for the U20 are getting
to be hen's teeth. I had to replace 3 of the 4 timing gears on mine this
time around and it ain't cheap. Better to bite the bullet now than to not
be able to later.
My .02
Brian
-----Original Message-----
From: owner-datsun-roadsters@autox.team.net
[mailto:owner-datsun-roadsters@autox.team.net]On Behalf Of Geegc@aol.com
Sent: Monday, June 04, 2001 2:35 PM
To: datsun-roadsters@autox.team.net
Cc: jc1725@charter.net
Subject: Main bearing rebuild
The main bearings on my 68 2000 went bad, and Les suggested that I rebuild
the entire engine rather than just redoing the bearings. That is a much
bigger job, and I am seeking the advice of the list. What do you think
could
cause the main bearings to go bad? Do you think an entire rebuild is needed
(based on totally inadaquate information).
Gary Cohen
the red one
the black one (in repair)
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