Scott,
What I've learned about plastigauge is I couldn't get repeatable results
so I quit trying. If you think you need to take up a little slack in the
clearance you can have the new bearings ceramic coated which will take up a
small amount.
Jim G.
-----Original Message-----
From: fot-bounces@autox.team.net [mailto:fot-bounces@autox.team.net] On
Behalf Of Scott Janzen
Sent: Sunday, February 19, 2012 9:10 AM
To: 'Friends of Triumph' Triumph
Subject: [Fot] Plastigage
I'm refreshing the bottom end of my GT6 - was too lazy to deal with the
pistons and cam timing in order to do proper crank measurements, so I
thought I would just slide in new bearings after a season. The crank looks
good - it was nitrided and shows very little wear, but the bearings, checked
with plastigage, were about 1/1000 looser than the original install at just
under 2/1000s, so I thought I could recapture some of that difference with
fresh bearings.
That's worked out, but here's the punchline - I've been using green
plastigage - .001-.003 range. Just for yucks I put a piece of red
(.002-.006 range) in one of the mains across the oil channel from the green
- where the green was measuring .0018 +/-, the red measured .0025! Tried a
few more with the same results. I'm inclined to believe the green as the
measurements are in the middle of it's measurement range (and it's the
result I want!) - but am really surprised at the difference.
Anybody have any plastigage expertise or stories they can add to this?
BTW, I went out shopping for jewelry for my wife for her birthday yesterday,
and was grumbling to myself about the price, then remembered that new 2010
helmet and hans device I'm about to order, and the trans rebuild I just paid
for, and the engine work, and the first race weekend, and suddenly I was
really happy Sara supports my racing, and the earrings looked pretty
reasonable!
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