YM165 Low oil pressure

[careyo63]

Bearings are Aavil from Fredricks, (121450-02100 Fr.-Main MB-145 2nd. Main MB-245 3Rd. Main MB-215)
Rear Main 140/147 MB-445 Rod bearing 140/147 RB-31

Replaces .25 under
front (121450-02310) MB-145C
2nd. (121450-02380) MB-245C
3rd. (121450-02370) MB-345C
Rear Main (121450-02110) MB-445C
Rod Bearing (105311-23380) RB-31C

 

[etpm]

The crank looks good but the bearing surfaces might be out of round. Do you have a micrometer to measure them? If not then any machine shop could measure them to see if they are oval shaped. It would take less than 5 minutes. I say this being a retired machine shop owner. They probably are OK but it would be nice to know. Aside from that I think your plan is good.
Eric

 

[mutt606]

I do have a micrometer and will check that this evening.

 

[mutt606]

Best this new micrometer user could come up with is 0.0002" and the normal dimension is 0.0004" on the main bearings..