Noah H Posted July 14, 2022 Report Share Posted July 14, 2022 Took a look at my bearings. No 2 is worn very badly .04 all the others read .0015 on the plastiguage I’ve heard 2 and 5 go bad the fastest due to an oiling design. So they were the first ones I checked. my question is, are these standard bearings? I am not seeing STD anywhere.. i cannot get a good picture but I can read what they say. #2 2568B010N #5 13- OB 60M MG Any Ideas? next step.. mic the crank. Quote Link to comment Share on other sites More sharing options...
DJK Posted July 14, 2022 Report Share Posted July 14, 2022 I have a set of TRW .002 rod bearings if you are in need of them. 1 Quote Link to comment Share on other sites More sharing options...
Sniper Posted July 14, 2022 Report Share Posted July 14, 2022 my main bearings were not stamped with any size designation either, but there was shim stock underneath them. I think that was common back then. My rods were marked with .001. Here a link to the thread on that tear down 1 Quote Link to comment Share on other sites More sharing options...
keithb7 Posted July 14, 2022 Report Share Posted July 14, 2022 (edited) Mic the crank is the way to go. For some of us rookies, I find that taking 6 or so readings with a mic on the crank, remove and re-set the mic each time. Write down your 6 measurements. Add them all up and divide by 6 should get you a good average. A difference .002 to .004 can be easy to get a bad reading. If I recall main bearing is 2.5", rod bearing 2 ⅛". What was your oil pressure? Edited July 14, 2022 by keithb7 2 Quote Link to comment Share on other sites More sharing options...
kencombs Posted July 14, 2022 Report Share Posted July 14, 2022 8 minutes ago, keithb7 said: Mic the crank is the way to go. For some of us rookies, I find that taking 6 or so readings with a mic on the crank, remove and re-set the mic each time. Write down your 6 measurements. Add them all up and divide by 6 should get you a good average. A difference .002 to .004 can be easy to get a bad reading. If I recall main bearing is 2.5", rod bearing 2 ⅛". What was your oil pressure? Excellent advice. Crank measurement drives the bearing choice anyway. And that's the only way to determine if it is out of round or tapered in addition to the basic size. Quote Link to comment Share on other sites More sharing options...
keithb7 Posted July 14, 2022 Report Share Posted July 14, 2022 If you used plasti-gauge, a long enough strip should give you a good visual on any tapered wear. Quote Link to comment Share on other sites More sharing options...
Noah H Posted July 14, 2022 Author Report Share Posted July 14, 2022 1 hour ago, Sniper said: my main bearings were not stamped with any size designation either, but there was shim stock underneath them. I think that was common back then. My rods were marked with .001. Here a link to the thread on that tear down Very helpful thanks sniper.. Quote Link to comment Share on other sites More sharing options...
Noah H Posted July 14, 2022 Author Report Share Posted July 14, 2022 2 hours ago, DJK said: I have a set of TRW .002 rod bearings if you are in need of them. are these the bearings I would use if my crank is slightly worn? Quote Link to comment Share on other sites More sharing options...
keithb7 Posted July 14, 2022 Report Share Posted July 14, 2022 Figure out if you have taper wear. You likely do. How much taper? Take good measurements then come up with a plan upon review. The quick easy solution is not just popping-in 0.002 bearings on the crank as it sits now. 1 Quote Link to comment Share on other sites More sharing options...
kencombs Posted July 14, 2022 Report Share Posted July 14, 2022 2 hours ago, keithb7 said: If you used plasti-gauge, a long enough strip should give you a good visual on any tapered wear. Only if the taper is uniform. Not unusual to find taper only on the portion of the crankpin that is up when the cylinder is on the power stroke. Usually accompanied by overall wear though. If that portion happens be under the rod cap with plasti-guage it will not show up. 2 Quote Link to comment Share on other sites More sharing options...
Noah H Posted July 15, 2022 Author Report Share Posted July 15, 2022 16 hours ago, Sniper said: my main bearings were not stamped with any size designation either, but there was shim stock underneath them. I think that was common back then. My rods were marked with .001. Here a link to the thread on that tear down Did you end up keeping the bearings you had? Quote Link to comment Share on other sites More sharing options...
Noah H Posted July 15, 2022 Author Report Share Posted July 15, 2022 13 hours ago, keithb7 said: Figure out if you have taper wear. You likely do. How much taper? Take good measurements then come up with a plan upon review. The quick easy solution is not just popping-in 0.002 bearings on the crank as it sits now. What benefit would I gain polishing up the journal and throwing in .002 bearings? Common sense says to replace all bearings, even if the rest are within spec? I have yet to find my mic. But if I have slight taper would the .002 bearings wear prematurely? Quote Link to comment Share on other sites More sharing options...
Sniper Posted July 15, 2022 Report Share Posted July 15, 2022 6 hours ago, Noah H said: Did you end up keeping the bearings you had? I haven't got that far, yet. Odds are that even if everything checks out good and I don't need machine work or bearings I will be putting new ones in anyway. Quote Link to comment Share on other sites More sharing options...
DJK Posted July 16, 2022 Report Share Posted July 16, 2022 On 7/14/2022 at 10:23 AM, Noah H said: are these the bearings I would use if my crank is slightly worn? Yes. As stated previously, after careful measurements. Quote Link to comment Share on other sites More sharing options...
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