New bottom end bearings

[lostagain]

I just finished replacing the crank and rod bearings in my 6V92TA. This is a "new" engine: 1993, with about 200 000 km, 130 000 m on it.

I measured the used shells and thrust washers, and they are within a few thousands of their service limits. They might have lasted a little while longer, but I feel better having changed them sooner than later.

What I am saying is, bearing do need replacing every couple thousand miles.

JC

[Bill B /bus]

You are about schedule as the engine gurus told me 100K to 125K miles pull the pan and change bearings. And then run the rack(s). 

Bill

[lostagain]

Well, I was thinking about running the rack, but the manual says there is no need unless it doesn't run well, or new injectors were put in, etc. So I might leave alone for now, because it does run quite well and smooth.

I also put a washer under the oil pressure regulator spring, as per the service manual's recommendation. That will give me an extra 5 psi. It has been showing 40 psi while cruising hot. So with that and new bearings, I should see noticeably more pressure.

On down my list...

JC

[luvrbus]

JC, should be around 65 lbs at 1800 maybe your engine still has the 6v92 oil pump most were changed to 8v92 oil pump to increase the oil pressure 


good luck

[bevans6]

My 8v71 was showing low oil pressure, and the previous owner had bearings rolled in, didn't change a thing.  OP was showing 30 psi hot at speed.  I was concerned and read virtually every post here that related to oil pressure, and found a thread that talked about the DN50 alternator and a required restrictor that sometimes was missing from a rebuilt alternator.  So I researched that, found the required oil flow to the DN50 on the Delco site, and found the required size of restrictor that would create that amount of oil flow, and added one.  The oil feed to the alternator was from the little manifold that the oil pressure sensor and gauge are also mounted on.  Oil pressure went up to 45 - 50 psi hot.  So I disconnected the alternator oil feed and plugged the hole off, and oil pressure went up to 55 - 60 psi hot.  So I decided everything was fine, and put it back together with the restrictor in place, and went on my way to worry about other things.  Just a thing to check if you are showing low pressure.

Brian

[TomC]

When I was running my 8V-92TA, the service maintenance schedule was- every 100,000mi run the rack and adjust the valves. Every 200,000 miles roll in new bearings.  Every 300,000mi new injectors, rebuild the blower and turbo. At 500,000mi suggested overhaul.  This is running hard everyday with 80,000mi gross.  Good Luck, TomC

[lostagain]

OK, I can see clearly now that there is a tune up in my near future!...

I did it on the 4-71 a couple years ago when I overhauled it, so I can do one on the 6V92. I'll start studying the manual about the details of the procedure. I've been a little reluctant about getting into it because the exhaust pipe comes around in front of the heads toward the side mounted turbo, and will have to come off. I'll have to remove the air intake pipe from turbo to blower as well. But once I'm there, and the valve covers are off, there is actually more room to work than there was on the 4-71 so close to the bedroom floor.

Once I get started, I might start a new thread seeking advice for things that I can't find in the manual.

JC