| Author | Message | ||
| Todd
Rating: N/A |
I am buying an '86 peterbilt with a 8v92 detroit. When I first saw the truck there was no oil under it. I then started it,the idle was up and down for about 10 seconds then lvled out and purred like a kitten. Alot of smoke comeing from the stack and the breather that runs down past the oil pan is dripping oil and when I pushed on the accelerator it would spray the oil out of that same breather. On the exhaust side of the turbo there is some oil leaking from the exhaust where it is clamped to the flex hose. I took the truck onto the road and so much smoke came out that I couldnt see the cars behind me. There also seemed to be a loss of power,not alot but it certainly didnt feel like 475hp. By the time I got back to the lot the smoke had stopped spewing from the exhaust and the only time the smoke was thick and black was when I changed gears. Can someone please tell me what they think is the problem with this truck before I go blow $10k on an inframe. Im pretty sure the smoke at the beginning and the oil comeing out of the breather is from people looking at it and just ideling it because there was no more oil dripping out of the breather when I was done with my test drive. PLEASE HELP... | ||
| Mike (Busone)
Rating: N/A |
I am no expert, however from what the experts on this group always say about the things you are describing. Sounds like the engine needs a rebuild. Of course some of the problem could also be it has the wrong oil in it. | ||
| RJ Long (Rjlong)
Rating: N/A |
I think you answered your own question - Detroits like to be DRIVEN, not idled!! You need to take it out on a 100 mile run - preferrably with a trailer so the engine's "working" - and then take a look at the slobber tubes and exhaust, before you decide. Also, you should have a GOOD Detroit two-stroke mechanic take a look at it before you plunk down your $$$. You gonna swap this 92 into a bus??? | ||
| Geoff (Geoff)
Rating: N/A |
There is no such thing as "slobber tubes", RJ. do you mean the air box drains? | ||
| Ron Walker (Prevost82)
Rating: N/A |
I agree with RJ ...to add a comment the oil on the exhaust side of the turbo means the turbo seals are probably gone. If your are putting this engine in your bus "you'll love it" I put one in last year... Ron | ||
| bowlingshoegiverouter Rating: N/A |
series 60 dietroit ...4 stroke...better engine...less $$....430 to 500 horse=5000.00 | ||
| Bob Vandawalker (Rav221)
Rating: N/A |
The same thing happened with my "first" 6V92 Detroit, until the thing warmed up it was like you were fogging for bugs. Open the oil fill cap and see if there is any blowback pressure. If there is the engine likely has bad rings. You can also tell if one cylinder is running cooler than the others. Yet another way is to get onto the trottle hard once or twice while sitting, if your hear a rattle or pinging it can mean oil is getting into the cylinders. Blowback pressure will also cause the air box drain under the engine to fill up, causing leakage, especially at idle. My engine would purr like a kitten, however that kitten pee'd a lot of oil, top and bottom. I don't buy into the theory than all 2 cycle Detroits leak oil. My present 1986 6V92TA is dry on the bottom side and doesn't smoke. The truth be known, if I had unlimited funds, I would have chosen a bus with a Cummins or preferrably Cat (not the 3208 which produce little torque). The 2 cycles are good, hard working engines, they just add a few extra headaches to the training curve. I would be cautious about a Detroit that blows excessive smoke and oil unless you are prepared to spend may thousands of dollars. Bob V. | ||
| RJ Long (Rjlong)
Rating: N/A |
Sorry, Geoff, was just using the slang term for the air box drains. No "oh-fence" meant to the great Bay Area DD guru!!  RJ | ||
| Sammy
Rating: N/A |
When older Detroit 2 strokes sit for a while at idle,the airbox gets wet with oil.Naturally when you first accelerate you'll get a cloud of blue smoke.It also sounds like you might have possible problems with the turbo - lack of power, much more smoke.If you're really interested in this vehicle, I'd pay to have the engine checked thoroughly - compression test, leakdown test, check crankcase pressure, etc.They can also remove the inspection covers to check the crosshead piston seals - another common problem with older engines. As someone has always recommended, I'd get a truck with a Series 60. What a workhorse, awesome engine. It's an inline 4stroke turbocharged engine. The're good for a million miles before they might need an inframe - when properly maintained.Good luck. Sammy | ||
| Geoff (Geoff)
Rating: N/A |
Actually, I'm sorry I got particular. I feel better now after my dinner and nap! To add my 2 cents to the chorus, the engine sounds like it is worn out to me. If it is possible to see how much oil is coming out the air box drains that would be the most telling clue of a worn 92 Series engine. | ||
| todd
Rating: N/A |
Well after about 5 minutes on the road the smoke cleared up and the only time i got a puff of black smoke was shifting gears and it quickly cleared up upon acceleration. As for the oil comeing out of the breather,when I got back from the road test and idled it and revved the motor up, there was no more oil dripping from the breather. My conclussion was that this is a turbo problem Im just hopeing that Im right as I have already put $2k on this rig to hold it. Im often times wrong but hey whats wrong with peein on an electric fence.....ya got a 50 50 chance that it wont hurt | ||
| Geoff (Geoff)
Rating: N/A |
Not the breathers, Todd. Look at the sides of the block and you will see a couple of steel lines running down each side with a check valve at the top. These are the air box drains, if you don't see them leaking they are probably plumbed back into the oil pan. If so, disconnect them from the oil pan rail and pull them out a little bit so you can see what is coming out at idle, and at idle after a hard run. If they are already open and blowing air without oil, congradulations, you probably have a great engine(or at least good rings)! |