New DMC main rod bearings don't have an oil passage hole??

[Jeffu]

I am in the process on re-building my motor. I just received a set of main rod bearings DMC part#102612. When comparing these to my old rod bearings I noticed there is no oil passage hole? Can this be right?? Seems to me that these new bearings should have been manufactured w/an oil passage hole.

The DMC bearings are stamped "FM 66310RA" on one end and "E245571" on the other. My old bearings are stamped "E247292". These are standard sized bearings that I am removing and replacing. All other measurements with a digital caliper show the same size of the new bearing versus my old bearing.

Does anyone have any advice on this? Common sense would tell me to use bearings with an oil passage hole like my old ones?? You will notice my used bearings on the right in the pictures.

Thanks! -Jeff

157931579415795

[DMC5180]

Main Bearings Must have holes So the oil flows into the Crankshaft. Rod Bearings do not need a hole. Oil flows from the Journal passage onto the rod bearing.

Does the Connecting Rod have have a hole on the side the matches the Old bearing hole?

[Jeffu]

Main Bearings Must have holes So the oil flows into the Crankshaft. Rod Bearings do not need a hole. Oil flows from the Journal passage onto the rod bearing.

Does the Connecting Rod have have a hole on the side the matches the Old bearing hole?

Yes, there is a "half moon" shaped hole on the connecting rod side, but not on the end cap side.

15796

[LEVY]

Most V Engines need that hole, if the connecting rod have a hole that matches that in your old bearings, then your engine might need that hole, some people however, would use bearings with no hole to boost oil pressure.

LEVY

[David T]

Your old bearings look fine. I would dry-assemble with Plastigauge and measure the clearance. If it is within tolerance I see no reason you cannot reuse the old ones. Good catch on the oil hole. Call the vendor you got them from. Get out your Workshop Manual and read C:01:01 paras 10 and 11. The con rod bearings may not require the hole.
David Teitelbaum