Metal In Oil Pan - How Much Is Too Much?

[luvrbus]

The problem is Don he has no history on the engine or didn't post it anyways, he has something going on 92 the series are tough on bearing they use the same bearing as the smaller *v71 and Detroit recommends replacing the bearing when they wear.He says he has good oil psi but what is it ? for 200 bucks worth of bearings, he is good for another 100 thousand miles. The old 2 strokes will run when they need attention that is a problem and people don't give the TLC they need, Common sense and being cheap are not the same IMO 

[freds]

Bus Grease Monkey has a couple videos about replacing the bearings on 8V92 back when he was still on the road.

https://www.youtube.com/watch?v=YhwAIekFleQ&t=9s

https://www.youtube.com/watch?v=2aC09lw7cu0

[chessie4905]

Remember, if you dig into it to check the bearings, check for the undersize markings.

[Glennman]

My old Fishbowl 6V71 with 2 speed Allison had issues once. We were getting ready for about a 500 mile trip so I decided to change my tranny fluid. The transmission dropped a bunch of large steel pieces, some about 1/2" across. I could have filled a coffee cup half way. Once I'm geared up for a trip, it takes a lot for me to change my mind. I cleaned out what I could, put new fluid in and went on the trip anyway. The bus ran perfect, but I did end up installing a rebuilt unit the next year that was once owned by the local city shop and was eventually sold to a transmission shop. No problems after that. The point being that it is amazing how that kind of thing can be in there and the bus still runs well. I would follow the advice to change the oil again later and see if anything new shows up (and maybe pull a sample of the old and have it tested too).

[brianzero]

Thanks for all your knowledge and collective experience and advice. This will keep these old detroits alive.

Im going to pull the main crank bearing caps and see what kind of shape they're in. If they're thrashed, Ill assume they're all thrashed, then Ill order a set of bearings.

[luvrbus]

Thanks for all your knowledge and collective experience and advice. This will keep these old detroits alive.

Im going to pull the main crank bearing caps and see what kind of shape they're in. If they're thrashed, Ill assume they're all thrashed, then Ill order a set of bearings.

If you have the Detroit engine manual it will show pictures of bearings usable and non-useable and give you the allowable specs ,the rear main will show the most wear since it is the last in the pecking order to get the oil flow

[brianzero]

If you have the Detroit engine manual it will show pictures of bearings usable and non-useable and give you the allowable specs ,the rear main will show the most wear since it is the last in the pecking order to get the oil flow

I do have the manual. Im going too start studying the parts involved.

[brianzero]

Hey luvrbus, would you use new bolts for the bearing caps?

[Utahclaimjumper]

Not necessary,, but pay attention to the torque specs..>>>Dan

[tr206]

Remember, if you dig into it to check the bearings, check for the undersize markings.

Like chessie4905 said if you do change bearings look on the back of the bearing to find out what size they are (before you order them) check 1 rod and 1 main they maybe different sizes.

[dtcerrato]

When we did our in-frame rebuild we plastic-gaged all the rods and mains before & after total bearing replacement it really told the overall condition of the rod & crankshaft journals. The thrust bearing was almost toast and rolling the new bearings in was a breeze. All the journals were 10 thousandths under. Ordering parts was a bitch until I learned it was a Grey Marine block - not a Detroit Diesel (with Clifford's help) as there were no Detroit stampings anywhere. At 17,000 miles on the rebuild it runs awesome - great oil pressure and consumes/leaks three quarts of oil in 5000 miles. Do whatever you personally need for peace of mind. 

[brianzero]

Here we are with the first bearing cap off (front most cap). What does everyone think of this condition, I think theyre very good, minus some dirt scratches:

Should I even bother to pull the upper bearing when it looks like this??

[brianzero]

The second bearing looked even better than this one. There is clearly no issues in this department. Im going to take a look that that rear main bearing and thrust bearing.

[luvrbus]

Those look good the wear is mostly on the lower cap bearing,you should pull the rear to check your thrust washers

[Utahclaimjumper]

 Make damn sure you replace each bearing cap as it came off that throw,, don't attempt to install it after turning it around,, the bores are ground as a set and only fit properly one way..>>>Dan