Whoa Boy, Air Box Drains

[muldoonman]

Will tomorrow morning Scott. Spits out pretty good and no oil out exhaust/muffler. If anybody knows of a 2 stroke cat I'm all in and almost anywhere. Tommy down at Stewart the other day said he had a few that could still work on these. Geoff,know about the shops and overhauls. Peg you as much as they can. That's what a lot of them are in business for. Making big money. Don't mind paying but if engine doesn't need it , Why?? This low mileage motor has run with no oil usage until now. That's the way it goes.

[Scott & Heather]

Glen, I always take my coach to Gene's Bus Charters in Burleson Texas. Those guys have a pit for starters. Family owned business with the dad "David" who teaches his sons everything they know. He inspects their work. They own a ton of Neoplans and still run them in charter service, they also have a brand new MCI in their fleet. They fixed some weird issues with my bus brakes. But I did chat with SS down here and they old me they have three two stroke guys who have supposedly worked there for 40 years!!! Being in good hands might be worth the $$$.


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[bigred]

I don't mean to over simplify things,but if this started after having your oil changed,there has to be something that was done when it was in the shop.Have you touched bases with Prevost and told them what is happening?

[muldoonman]

 Other than overfilling by a gallon. Nothing. Told them after I got on the rode and home. They have done this twice and with me  telling them. Last time was in shop, bus was in air, and they said no pumpkin heads back here under or around bus. My fault as I should have just put 8 gallons out instead of the 3 unopened boxes of Delo 100. Don't think that would hurt just blow it out they say. Think it will keep spitting as I used the theory to let it find it's place on oil stick and it was down below the L on the stick. Might a just kept going.

[luvrbus]

With 86,000 miles if it did break the oil control rings they can install new rings,IF it has ever gotten hot but if they see black marks on the liners and piston scaring they won't install new rings.
The friggn oil rings are the only rings you cannot inspect through the air box covers on a DD 8v92 the piston has to be removed $$$$,I think the problem is up top JMO 

[Geoff]

I doubt the oil rings broke.  On the 92 Series the oil rings lose their tension and pass oil into the airbox while the compression rings keep their tension and the engine still runs good.  I covered this in an earlier post.  I just hope this doesn't happen to me since I also have a low milage 92 with 20 years on the clock.

--Geoff

[luvrbus]

I never saw oil rings loose tension unless the engine has been run hot but have seen a bunch of 8v92 with broken oil control rings,for some unknown reason seems like numbers 5 and 8 always break.I would worry about that Geoff.
I have taken military 8v92 that were rebuilt 30 years ago and were perfect when you fired it up after setting for years   

[Geoff]

I have rebuilt more 92 Series engines than I can count.  When they get tired the first thing that goes out is the oil control rings while the compression rings are still good.  This is the 92's, the 71 Series lose their compression first.  The only time I have found broken oil rings is when the rebuilder overlapped the spring tensioner which immediately breaks the oil scraper rings when the pistons are forced into the liners.  A common mistake made by newbies.  I don't know about clyinders 5&8.  Never heard of that one.  The theory I posted earlier was that the oil rings lost their tension from 26 years of low usage.  I've never heard of them breaking if they were installed correctly.

Hopefully we will hear what the problem was when the pistons are pulled.

--Geoff

[luvrbus]

I don't know but it is never a problem on the standby generators around here losing tension on the oil rings but anything is possible I guess   

[Geoff]

Other than overfilling by a gallon. Nothing. Told them after I got on the rode and home. They have done this twice and with me  telling them. Last time was in shop, bus was in air, and they said no pumpkin heads back here under or around bus. My fault as I should have just put 8 gallons out instead of the 3 unopened boxes of Delo 100. Don't think that would hurt just blow it out they say. Think it will keep spitting as I used the theory to let it find it's place on oil stick and it was down below the L on the stick. Might a just kept going.

A lot of people run their Detroit 2-strokes one gallon low (at the low mark) because their engine uses one gallon of oil if filled to the full mark and don't use any oil if kept at the low mark.  I'm one of those people.

--Geoff

[bigred]

Muldoonman:I sent you a private message !! Don't know if it will be of help to you or not but you can check it out none the less.

[Iceni John]

A lot of people run their Detroit 2-strokes one gallon low (at the low mark) because their engine uses one gallon of oil if filled to the full mark and don't use any oil if kept at the low mark.  I'm one of those people.

--Geoff

Do those engines actually burn their excess oil, or is it just blown out the airbox drains?   I just topped up my engine to the Full mark in preparation for a trip to the desert this weekend  -  should I remove some of the oil to get the level back down to the Fill mark, or just let nature take its course?

I run both my airbox drains into a catch bottle by the back bumper, and each drain tube has a short section of clear tubing so I can see how much oil is coming from each side.   I have slightly more coming from the driver's side, so I guess one piston there has oil rings that are beginning to weaken.

John

[muldoonman]

Muldoonman:I sent you a private message !! Don't know if it will be of help to you or not but you can check it out none the less.

Thanks BigRed and everybody. Coach is in at Stewart Stevenson, San Antonio Tx. Delivered it this morning (125 miles south) and they have already called and it's in and getting checked out. Back at house counting my 8 year old Granddaughters inheritance fund to see if I'll have enough to bail it out. Well, I'll leave her the bus..

[lostagain]

My 6V92TA doesn't use oil, or very little. I run it with the oil at the top full mark. Engine oil contributes to cooling so more is better in my not so learned opinion.

JC

[Geoff]

Muldoonman

We are awaiting the S&S report.  I hope some of this discussion helps your pocketbook.

--Geoff