Bearing clearances and oil weight are a couple you can check.
Check the remaining main clearances. Some builders use .003
on the rods and mains. Greg Solow uses .0025 - .00275.
Do you know what your clearances were ? And what weight oil
were you running.
I was reading up on different oils and went to the Joe Gibbs site and
found some interesting bits. This is the first time I have seen different
oil weights matched to bearing clearances. If interested here's the link
and some text I cut & pasted from the site.
http://www.joegibbsdriven.com/products/syntheticracingoil/xp2.html
XP-1
Viscosity typical of SAE 5W-20.
V8 engines with clearances under .0025
XP-2
Viscosity typical of SAE 0W-20.
Restricted air intake engines and engines with clearances under .0020
XP-3
Viscosity typical of SAE 10W-30.
Engines with clearances under .0027
XP-7
Viscosity typical of SAE 10W-40.
Designed for clearances under .0030
Jim G
----- Original Message -----
From: SpiwakD@aol.com
To: fot@autox.team.net
Sent: Wednesday, June 8, 2011 6:29:20 AM
Subject: [Fot] Bearing problem
I just had all new bearings installed in my B TR3 at the local shop. We
misread the dipstick marks(new B dipstick) and it was low by 1 1/2 qts. I do
have
a Accusump. I ran two sessions B and then pressure dropped to 20 lbs. The
rod bearings are dark-colored and spun. B The center main is spun also. We
didn't remove the other caps yet.
B
The local shop is afraid to put in new bearings because they might have B
missed something the last time. The crank had been ground and checked for B
trueness. I hate to take it to an engine builder because I won't see it for B
six months. I only got a half hour before bearing failure.
B
Does anyone have any thoughts as to what to look B for?
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