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Engine Access
Wondered how many of these conversions had engine access over the bed area on the coaches. Having a big problem with oil blowing out the Air Box drains on my 8V92TA and found out mine (engine) is not accessable from top. Thought I would Remove goodies and make it easier for Stewart Stevenson to look at it. Fella on another board said Compression test would not reveal oil ring failure. Engine could still have compression but oil getting by. Just wondering about engine access from top.
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20 Replies
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Oil comming out the blow-by tubes could also be comming from the seals in the scavenger blower and not the engine piston oil control rings. It was a big problem in the old 8-V71’s. I’m sure your DD dealer will be able to figure it out.
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Where would these seals be located on a 8V?
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have you checked valve cover vent’? you might be creating positive pressure in crank case pushing oil past rings into air box and out air box drains. No smoke –easy check oil filter (did they leave old seal ring on) or bolt on ascessory /alt has small oil line that rubs thru. same with air compressor. If rear seal will be wet around starter bolts(usually) Just trying to give flow of things. Hard to share info when not there!! just trying to let you know flow. Bob
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Glen,
I would be surprised if you did not have a cover over your engine. Prevost installed them on the chassis and they were plywood with steel flanges around the perimeter. Try looking over the engine to see if it is there. It might be the converter covered it with flooring, a cabinet or a bed, but it should be there.
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Bob, Valve cover vent is open or venting. No blow by there. Thought it was the air box drain check valves malfuntioning. Put new ones on and that’s where oil is spitting out. Drove it 200 miles north middle of week and had to add 2 gallons and drove it back to barn and added 2 gallons yesterday. All coming out of air box drain tubes.Both sides. Oil spray all over back of bus as check valves apparently not closing. Engine is on outside always has been clean as a whistle. Silver all the way. Never has been hot. Just started this after moving it over a few months ago from storage. It sat for about 6 months. Motor still runs, sounds good with no misses or shakes. Oil pressure still runs about 45 to 50 at speed . Hearing anywhere from oil rings to blower seals. Fella on another site said oil rings can break and still have compression.
Jon, Boys that built this one were cabinet makers (Cole Conversions out of Wyoming) and might have to dismantle bed frame to get to motor. Drawers and storage all underneath. Ain’t gonna do that (dismantle) and assume they can pull engine if needed.
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So let me see if I can sort this out. You might have access to the engine via a hatch in the rear bedroom floor, but you cannot access the access because the bed in the bedroom has to be disassembled to access the access.
Makes sense.
I think.
From experience I can tell you that you can do everything needed on the 8V92 from the rear of the coach or the sides, but if you do not want to access your access you will have to access the 50DN and the power steering pump from beneath the coach, and by beneath the coach I mean with the coach up in the air.
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Thanks Jon. Gonna go have another look in a minute and would just as soon not have a mechanic back there anywho. Could see where after taking water pipes, turbo goodies , breather stuff off could get to radiator side valve cover. Passenger side is pretty clear.
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You can get at the radiator side of the engine reasonably easy. I remember getting at mine ot replace the exhaust manifold, and to pull the valve cover to get at the jake brake solenoids all from the back.
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have you changed it since you owned it? on sides of engine there are inspection covers(about ck valve height) you can see pistons thru them. If one is wet start looking there. If your loosing oil. 2 ways out thru exhaust and air box thru ck valves. if the ck valves/air box drains are installed /working the only way out would be exhaust or leak on wet side. No intake valves on 2 stroke. sucks air into piston from air box then squirt of fuel from injector and power:: then exhaust thru valves when they open. then it will smoke.
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No oil out exhaust pipe. Clean, so ain’t going out there. Doesn’t smoke at all. Leaks oil at High idle and going down road all though air box check vavles. I never have let it idle long. Really just noticed it a couple weeks ago when checking OTR Air as I have a leak somewhere there. Puked all over floor. New check vavles installed. Nothing wrong with old ones.
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A simple way to tell if it is the turbo remove the pipe from the turbo to the blower and see if it is oily. While it is off lok in the blower and see if it is wet with oil. Then with the oach running look at the engine breather tube under the bus and see how much blow by is there. It is is substantial it may be rings, in not it i probably the blower or turbo.
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No blow by on the breather tubes or exhaust. Just oil out the air box drains check vavle tubes..
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air box is a large collection box after pressurized air by blower and turbo. two ways it can get out of box.. when the piston opens up past a intake port( no valve) or our air box drains. the air box drains are check valves that close at 7-9 hundred rpm and seal to outside. at regular idle below 700 rpm they are open to drain. Blower seals or turbo seals for their oil supply are the only thing ahead of air box. do let me/us know outcome. your oil level should be 3/4 inch below oilpan/ block line. Bob
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Thanks Bob and folks on the info. Will keep you all posted on the outcome. Get this problem tackled and got a few more fires to put out on the coach. Always something.
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Glen,
Please make sure you investigate whether S&S really knows what they are talking about when it comes to Detroit 2 cycles. Just because its says Detroit Diesel on the outside of the building, does not mean they have a “seasoned” mechanic to work on 2 cycles.
We had a customer who was at a S&S in Farmington New Mexico, the mechanics could not figure out how to re-install our 2 cycle engine without several phone conferences with our “tech guy”. Some of the questions they were asking were pretty scary. But at least they had the sense to call and ask with the help of the customer who encouraged them to call. It took them a week to install it.
I would encourage you to maybe insist that you meet the mechanic who will be working on your engine. If he is young, I would be concerned. If he looks stubborn, REALLY greasy, smells like diesel fuel, and has a half smoked cigerette in his front shirt pocket….. Thats your man!
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