In a message dated 8/18/02 9:24:59 PM Eastern Daylight Time,
kurtisj@cox-internet.com writes:
<< It reads:
4A STD
MF1
1810083 >>
For bearings in general and non TR specific, I'd say
4A ? ( might be a size variation or date code, see text below)
STD Standard size
MF1 ? ( might be a size variation or date code, see text below)
1810083 Looks like a part number
If these bearings are original, there is a chance standard can be .001" or
.0005 undersized. ( Normal undersides are .010, .020 and so on.) For
engines in general, the factory sizes cranks then installs under/ over sized
bearings on some journals to adjust clearance. This is also done with
cylinder bores and pistons, take a look for a paint mark on the side of the
block ( 70's Chrysler V8s, it is a letter under the final coat of paint) or
letter stampings on the top of the block. Kent 1.6 , used in a Formula Ford,
had pistons graded by letter, the "E" grade was the biggest "standard" size
and sought after by many engine builders.
With modern machining what it is, I suspect this practice is a thing of the
past and everything is now standard.
In most cases, the .0005 and .001 bearings are dealer only. I used to be
able to get .002 under bearings for Ford 302/351. These were great for
getting more miles from a worn engine without pulling the crank. Weird under
sizes seem to be common on old Continental engines and other industrial
applications. ( Not related to Ford, used on forklifts, compressors and such)
Factory shop manuals offer clues to decode any markings.
Harold
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