Where to buy .001 over sized Main Bearings?

[Comanche County]

Guys, recently rebuilt a 2.5. Oil pressure is just a little low. My buddy has put about 500 miles on it since I assembled it...new everything except crank and rods, .030 over pistons. Dropping to 10 psi when warmed and idling. The machine shop polished the main journals and clearance was a little on the high side of the spec .003.

 

I'm gonna drop the pan and roll in some .001 oversized bearings...but I can't find any? I know there out there guess I'm looking in the wrong places.

 

Anyone recommend a source?

 

Thanks

Jay

[Jeep Driver]

http://www.quadratec.com/products/52449_0671.htm?sgsc=C6Z06ZR1C6Z06ZR1&utm_medium=compshop&utm_source=googlemerchant&gclid=Cj0KEQiApbunBRDs0fba3dz484cBEiQAMsx-p7Ex_imL8baO2u0MTwcZIF-EHZsfHsI9xyDfT-vHxxkaArjN8P8HAQ

[Eagle]

You're looking for the wrong thing. The crankshaft was polished, so the crank is UNDERSIZED, not oversized. You need UNDERsized bearings.

 

What's the oil pressure at 1500 RPM? 2000 RPM?

[Comanche County]

:doh:

 

It jumps to 20 and up with any throttle.  Until its warmed up completely its idling at 40, then drops when hot.

[Jeep Driver]

At 500 miles it's now broke in.

 

Has he changed the oil yet? with what?

 

I'd go with a straight 40 and a Pure1 filter before you go changing bearings.

[HOrnbrod]

Jay, measured the clearance on each main journal with a plastigauge? Unlikely each journal will require the same spec bearing on a crank polishing job.

[Comanche County]

Yes, checked with plastigage.  You're correct Don, there was some variance. The thrust bearing was good, the other mains were just a little big .0025 - .003.  Rods were spot on.  New head and valve train components, timing chain, cam, cam bearings, lifters, Melling oil pump, pistons, rings. 

 

My renix 4.0 has been running low oil pressure like this for years. I wouldn't sweat it, but this isn't my Jeep and it is bugging me.  Its a mystery and there can't be mysteries in engine building, things are either in spec or they're not.  I triple and quadruple checked everything during assembly, torque specs checked with 3x wrenches.  I put it together correctly, the thing fired right up on the first turn of the key, but obviously something isn't right. 

 

I'm trying to rundown causes in my head and my first culprit is the bearing clearance.  Perhaps its bleeding off oil out of the mains and that could be disastrous later on for the rods if it gets worse.

 

Maybe the new oil pump isn't up to task.  I admit I didn't check the pump gerotor clearance. 

 

Not sure but I'm gonna find out.

[Jeep Driver]

Have you checked with a mechanical gauge?

[Comanche County]

Bearing journals?

[Jeep Driver]

No, oil pressure?

[Comanche County]

No, good idea though.

[cruiser54]

No, good idea though.

What if it was just a crappy oil sender or an inaccurate dash gauge?

 

The bearings are within tolerance.