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Bearing Clearance
Thread Starter
Instructor
Joined: Dec 2005
Posts: 121
Likes: 2
From: Middletown Delaware
Bearing Clearance
Getting ready to install the crank in my 383 build. Main bearing clearance with Plastic gauge is between .0015 and .002. To tight? Good to go? Thanks, George
Le Mans Master
Joined: Apr 2007
Posts: 7,353
Likes: 72
From: Graceland in a Not Correctly Restored Stingray
Sorry to disagree, but IMHO anything less than 0.002" is just too tight, and you could end up having to run such thin viscosity oils to keep pressures within reason as to create other problems. You can gain 0.0005" by using 0.001" thinner upper shells in the rods or lower shells in the mains, which would put you in the 0.002-0.0025" range. Don't consider the leftover shells as a waste, rather a small price for doing this right. Oh, and don't mix brands.
Thread Starter
Instructor
Joined: Dec 2005
Posts: 121
Likes: 2
From: Middletown Delaware
When I read the caps they matched the .002" marks. The crank had wider areas falling between .0015 and .002. How reliable is plastic gauge? Should I have it checked with a set of mic's? Thanks
Safety Car
Joined: Dec 2005
Posts: 4,270
Likes: 20
From: Central Michigan
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Le Mans Master
Joined: Jun 2004
Posts: 6,231
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From: Seattle WA
St. Jude Donor '14
For any type of performance engine, it's not enough I agree. As a side note, cheap micrometers and a set of snap guages are better than nothing. In my experience, these work well if kept calibrated. I have a real el-cheapo set I got at a swap meet that I use on my bench, and they've really held up quite well. The economy bore gauges are close enough as well until you get into big-dollar engines. All IMHO, of course
http://www.goodson.com/store/templat...b58fc626f7732e
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