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Author Topic:   "Cam bearing question on oil hole location???
Dirt Roller

Total posts: 20
posted January 28, 2002 03:56 PM
My question is: Should all the cam bearing oil holes be positioned the same. I've heard at 2 o'clock and I've heard it doesn't matter. I just got my block back from the machine shop and they are all over the place. Any help on this is appreciated. Rino

Dirt Maniac

Total posts: 135
posted January 28, 2002 08:01 PM
The Michigan Bearing site says to position them at 2 o'clock. The theory behind this is you want to oil a bearing just before the point at which it carries the biggest load, which in the case of a cam bearing, they say is 4-5 o'clock. Lets the oil wedge be at its best. Rod bearings follow this rule also. Just sound engineering practice. Does it matter? Who knows? The fact that the bearing is oiled from a somewhat restrictive annular passage makes some difference, I'm sure. I used to move 'em around to see if it made a difference(reults inconclusive), and I've also had bearings fail even when lined up properly. Next time, tell the guy where you want 'em, and let him know they weren't done right last(this) time. Better yet, buy a driver, and then you'll know they're done right! I gradually became an engine builder because I got sick of hearing excuses about why something wasn't done right, or having a guy who stopped learning 20 years ago apply his 'latest' technology to my engine!

Dirt Forum Racer

Total posts: 77
posted February 13, 2002 11:02 PM
I install all my cam bearings lined up
with the oil holes. this is the way i
been told by everyone I have asked and I
have never had any problems.

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