[Fot] Bearing problem

[Joe Boruch]

I have been using the Joe Gibbs XP1 oil in my TR3 for a few years with great
results. Joe(B)

---------- Original Message ----------
From: toodamnfunky at comcast.net
To: SpiwakD at aol.com
Cc: fot at autox.team.net
Subject: Re: [Fot] Bearing problem
Date: Wed, 8 Jun 2011 15:29:17 +0000 (UTC)

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 at aol.com
To: fot at 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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