I noticed when looking to purchase replacement bearing that they list standard size plus additional oversized sized. Why are there oversized sizes, Is this to do with the original block size variations?
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If the crank journals have been ground / resurfaced an oversize bearing is needed. You will need to take measurements to determine what is needed. -
Great to know. So the outside of the bearings are all the same diameter, it is the inside "The surface that wears" that changes with oversized bearings. So, I guess you would measure, with a caliper, the diameter of the crank shaft rod where the rods are attached to see the bearing size needed.Last edited by ClaudeC; 12-30-2017, 09:59 AM.Comment
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Correct it's the inside diameter that is over sized to compensate for any machiningComment
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I was measuring the rollers of the bearings for least wear. It appears the rollers for the waterpump front bearing should be .25" in diameter.
Some original spiral type bearings had about .002" wear.
A couple of the solid type bearings were about .001"+ wear.
A couple were right on .250".
The older stock new bearins were right on.250"
...10-24-2017, 10:09 PM -
Where was it used and when?
...10-04-2017, 05:21 PM -
To use a V8 flywheel and pressure plate, do I need to use the Model A throw out bearing (seen through the bell housing access hole), or the shorter part pictured on the bench?
Pic 1
Pic 2
...05-23-2020, 10:07 AM -
I know it's not the most accurate measurment but I just checked with a feeler gauge.
#1 .014
#2 .014
#3 .026
#4 .010
This seems way out of spec (especially #3). I have not yet removed the caps.06-15-2021, 09:23 AM -
I have tried this on ‘another Model A forum’ ... but ... you know !
I’ll try it on this very serious forum for a change. For a couple of months now I find myself being annoyed by the presence of the famous spiral grooves in Model A Babbitt bearings. I can understand someone adding some sort of oil groove in the upper half of a crankshaft bearing - helping distribute the oil - but never...06-01-2021, 03:51 PM -
Wrote the below and just went out to the garage to look again - I was confused on the below - so never mind for now, need to get the bearing off to see what I have - something to do tomorrow.
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Bought a used armature to repair a bearing/bushing generator with a bad shaft under the bearing....You do not have permission to view this gallery.
This gallery has 2 photos.05-22-2019, 07:01 PM -
Note the info corrections to this article starting on post # 30
The following topic covers adjusting the Crankshaft Main Bearing and Connecting Rod Bearing for babbit bearings. This should be a part of your routine maintenance on your babbit engine,performed once every ten thousand miles to insure full bearing life.The following will demonstrate the measurement method using both plastigage...01-15-2018, 05:31 PM -
Some help. What is the specification for the height of the fingers of the pressure on a F100 1973. How do I adjust them. The pressure is the larger one. Have already taken it for engineering but the height still ain't correct. It seems like the release bearing is vibrating....01-04-2019, 08:05 AM
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Anything special about replacing bearing on throwout assembly? Press on, press off?05-20-2018, 07:40 PM -
1933 v8, inspecting replaceable crankshaft rod bearings, how mucg wear allowed, when do you replace?12-29-2017, 12:21 PM
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