Ugly Rear Bearing

[Frank Mopar]

Pull my rear main to replace the seal and lo and behold the bearing was a mess. All the others are fine.

The crank was not hurt and I was able to clean it up nicely.

360 out of a 1974 Challenger. Not sure if its ever been apart.

Any ideas to what happened to the rear main?

 

[SGBARRACUDA]

Look at the rear of the bearing. See if it has a date on it. Will give you an idea how old the build is.

 

[Garrett Ellison]

Types of Engine Bearing Damage | KnowYourParts

 

[Frank Mopar]

Look at the rear of the bearing. See if it has a date on it. Will give you an idea how old the build is.

No date code on it unfortunately.

 

[RustyRatRod]

Looks like trash and debris got in it from somewhere.

 

[RustyRatRod]

No date code on it unfortunately.

View attachment 1715555487

No numbers on the other end of the bearing?

 

[Frank Mopar]

No numbers on the other end of the bearing?

No other numbers

 

[Dana67Dart]

Have you rotated the crank to see the other side?

 

[Frank Mopar]

Have you rotated the crank to see the other side?

The crank pic is after I cleaned it up. Both rear bearings look the same. Number 4 is ok. Didn’t pull the others yet. I’ll Change the bearings and run it.

I’ve had the car for 6-7 years. The motor was never apart since I’ve had it. Oil pressure has always been good. Running 10w-40.

 

[AJ/FormS]

IMO, you need to go upstream to find the blockage; don't just replace the bearing and hope for the best.

 

[Frank Mopar]

You'll have to go upstream to find the blockage

View attachment 1715555559
View attachment 1715555571

Right, I hear that. Funny part is I only pulled the cap to repair the leaking rear seal. Might have to go to plan B.

 

[AJ/FormS]

are you sure it's the seal that is leaking?
I mean if the cam plug is blown out or the one oil-galley plug up in the BH is coming out.... oil will come down in the same place, right?
So take a real good look at that seal that you removed.

 

[Frank Mopar]

are you sure it's the seal that is leaking?
I mean if the cam plug is blown out or the one oil-galley plug up in the BH is coming out.... oil will come down in the same place, right?
So take a real good look at that seal that you removed.

i had the trans out last year and seen no oil up higher.

From looking at oil flow (Sometime Google give you more then you want) it looks like oil feeds the 5 main then the connecting rod. So If the #5 connecting rod bearings are Ok the it should be ok to run Im thinking.

 

[Shorty Medlock]

Federal Mogul .001undersize... likely a factory original.

 

[MOPAROFFICIAL]

Federal Mogul .001undersize... likely a factory original.

Bingo.
Factory used those FM federal mogul ...you could also buy them . It dates it pretty close to era correct if not stock.

 

[Frank Mopar]

Great info Thanks!.

I have the exact replacements. I pulled the rod bearings and no issues were found. So Ill run it.

 

[Frank Mopar]

So one bearing has a bigger hole in it. Any info on where that one goes?

 

[Frank Mopar]

Nevemind. Cruze426 pointed out the fact that the big hole bearing is wider. Its #5. Doh!