Detroit 60 series 12.7 big block

The bull gear can be checked by taking either of these off. The accessory gear has an o ring seal, the cover plate on other side, has a paper gasket. A pry bar can be used to check for play in the bearing. Any movement is bad news. It’s got a big roller bearing similar to a wheel bearing that goes bad. Usually makes a unsteady rattling or thumping sound, a good Mechanic can hear the familiar sound, I’m told.

 

The series 60 engine in general is an excellent engine.

From what I understand, the bottom end is extra beefy and super heavy duty.

That was a good choice for you to buy.

 

Thanks, I might do that when we run the overhead. I didn’t change the oil pump either, it was changed once at 825k, so it’s got 1.3 mil or more. Pressures good, new check valves and elbow. Planned on waiting a couple yrs. to replace it. What do you think? Doing the oil cooler soon, and resealing oil pan anyways. Should I swap it out?

 

Last I check detroit still only recommends inspection and replace pressure valves.

I have never but once replaced a 03 and earlier detroit. Cause of failure was a small car hit and stuffed its self under a parked truck breaking the pickup tube. It was replaced just because.

Very simple, low wear item.

 

You just inspect the gears for binding or bushings for wear. Service either or both and replace as needed. But if you have good psi, you most likely dont have a problem.

 

big block Detroit hummm

 

To differentiate between the 12.7 big block and the 11.1 big block.

 

What about the 14Litre Huge Block...