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bdonally bdonally is online now
Registered User
Join Date: Dec 2001
Location: Off grid in Eastern ONtario
Posts: 232
As KYL said, measuring is needed to make sure the standard bearings will provide the proper clearances.
Rather than measure with the bearings installed, I dry assembled (several times) and measured the case bores, then calculated clearances using the bearing thickness.
I found that the surface of the bearings is really soft and, at least as an amateur, it is difficult to avoid marking the bearing shells with the bore gauge.
Also this approach let me see what shell thickness might be best. The 996 GT3 bearings are available in three thicknesses ( with a little looking) and allow a little fine tuning of the clearances without grinding the crank.
Measuring also lets you decide on reusing the #8 bearing, which is pricey, and, at least in my case, was within spec.
Same thing with measuring the IM shaft and bearings, and the rods.

lvporschepilot - a study would definitely be interesting but highly unlikely on these old cars. However, your comments about oiling practice triggered a thought. Once I knew all the assembled clearances, it assisted in picking an oil viscosity. In my case,
the mains are at the high end of the spec, so I decided to go a with a 15W50 oil.

Isn't it wonderful to be fooling around with stuff that has so many variables!!
Bob D.
'84 Carrera - MAF, Wong chip, RSR flywheel, ER bushings and other bits, CTR fiberglass F/R bumpers, 7/9 Fuchs, 22/27 TB, 22/21 SB, bunch of other little stuff
'69 Lotus 7 Series 3; '74 Fiat X1/9
'14 X5 diesel
Old 09-04-2018, 10:44 AM
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