Broke down in Fallon NV

[kyle4501]

RE a gallon in 600 miles.
I don't know if it applies here, but if my 8v92 is filled to the full mark, it doesn't take long to drop the oil level to just barely above the add mark, then takes a lot longer to drop to the add mark.

Maybe yours is the same ?

( I'm using Delo 100 40wt )

[thomasinnv]

The owner of the shop was a friend of mine i have known for several years, I originally called him not to take my bus there, but to inquire if he knew any good 2 stroke mechanics in the area. He had just hired this guy a few months prior and said that he came highly recommended by many. The mechanic said he was detroit and allison certified and said he had been wrenching on 2 strokes for 20 years, and had rebuilt too many allisons to count. He sure talked the talk in the beginning. Taking my bus there was not a decision I took lightly, there are too many horror stories concerning mechanics getting their hands on these things and messing them up. I was assured that he was equipped and able to do the job, and had done many many before. I made it extremely clear to the shop owner how important it was that the mechanic know what he was doing before I had the bus taken there, I guess he found out his new mechanic wasn't what he thought he was. I feel bad for the mechanic, he has really been humbled, he really is such a nice guy, but he definitely got in over his head.

[eagle19952]

i would not begin to "fault" anyone one over oil consumption till i had at least 1-200 hours at full load rpm....

[Oonrahnjay]

i would not begin to "fault" anyone one over oil consumption till i had at least 1-200 hours at full load rpm....

     And that 1-200 hours will also tell you if you have a "sweet spot" on the dipstick for an oil level that your engine likes.  I *definitely* would not keep filling right up to the "high" mark if I was seeing oil consumption that bothered me.

[Scott Crosby]

When I got my 3751 it has a bad hole.  After diagnosing smoke was coming from #1.  Also visual inspection of piston revealed oil on the sides of the piston in the liner.  Also that hole was low on compression.  I pulled the head and tore into it.  It had a bent rod and broken oil control rings. The bottom of the liner was also worn from the bent rod rubbing it.  It was a Crazy discovery.  After the repair all seemed fine but after about 1000 miles it started smoking a little.  I pulled the exhaust manifold and smoke is #1 again.  Small oil droplets are on the sides of the piston.  I'm getting ready to pull the piston and see what's going on.  I had the local shop do the new piston and load the kit for me.  They do 2 strokes every week in their shop so I trust their work but my guess is this one either the rings are bad or the wrist pin seal.  I will soon find out.  It's got about 10,000 miles on it and it's not worse or better.  I'm using about 1/2 gallon amd leaking maybe a quart every 1000 miles.  Just a little blueish smoke puffs at start up and idle until warm then it's almost invisible.  I have a few oil leaks but I'm looking forward to seeing what's up with that hole.  Compression is really good on it.  It's probably not worth even looking into but I have a small oil leak coming from the oil perimeter seal on the head that's driving me nuts so I'm going to pull the head anyway.  Gm's are so easy to pull the heads on especially the IL6 it's only a days work to tear it apart and get it back together.   I'm leaning towards oil control ring issue, but nothing will surprise me and it's always fun to work on the bus.

[luvrbus]

Finding a machine shop that knows how to rebuild the older engines heads are getting to be a thing of the past.Not all blue smoke are oil ring problems I have seen people just lap the valves and the guides are so worn they suck the oil.
Now days DD doesn't sell the liners in sizes 1,2,3,4 you buy standard or oversize sometimes it takes days and a lot of work to fit the new liners to the old 71 series blocks.
Lol I am not one that buys the sweet spot theory if it throws the 1st gal out something is wrong