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8V92 oil pressure question
8V92 Oil full in engine. Gauge on dash never has had good oil pressure (Dash around 15 psi at idle 40 psi at 1800 rpm, the rear gauge in engine compartment always read normal 20 psi @ idle 40 psi at 1800 rpm) but after a drive to empty holding tank couple days ago the oil pressure on the dash and engine compartment read 5 psi at idle 35 psi at 1800 psi. I drove it 110 miles today and everything was good other than the oil pressure reading on the dash gauge. Could it be the oil pump going out or does it have a sending unit that could have possibly gone bad?? Thanks for any thoughts on what is going on!!
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16 Replies
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Your oil pressures are perfect. Drive it and enjoy it.
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Mike, Thats exactly where my oil pressure runs on the dash 5-40. Mechanical gauge in the rear is 10 lbs higher.15 at idle. I would bet your rear gauge is the same as before at idle. Probably the front gauge or sending unit is off now after 30 years. They just dont make things to last!
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Mine is the same with 88,000 miles on it. Got Blower Seals installed last summer and had them put a new sending unit on. Didn’t change a thing up front. Water temp reads at least 10 degrees higher at dash gauge than back.
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Oil pressure gauge on dash is electic & the one in the engine compartment is a direct manual, which is probably more accurate, but I carry the same as you at 200,000 miles. Like John says, “Run it.”
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Detroit’s standard for the 8V92 and all other 2 stroke diesels, is 1.5 PSI per 100 RPMs. so at 600 idle it should be a minimum of 9PSI. At 1500 it should be a minimum of 22.5 PSI.
Hope this helps.
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SilverLeaf Electronics then you’ll see what your DDEC is seeing, instead of a what an old analog gauge is telling you. Plus you can set alarms etc.
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Of course that assumes the pressure sensor is more accurate than those old pesky analog gauges.
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Thanks for all the input fellows! Just had me concerned because it use to be a little higher reading. Makes sense, because I had a mechanic tell me never let the motor just idle. Always high idle the engine if I am parked and its running. Guess that low oil pressure could cause engine parts to wear more with the heat and friction. Also always use to leave a lovely oil slick when parked in my driveway but even that has stopped! Weird weird weird!!! Thanks again for the input!!!
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Mike, we make this stuff up.
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Did the oil slick in the driveway stop appearing about the time you joined the Prevost Community Forum?
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ck oil with engine off at least 10 minutes. 40 wt only in 8-92. Your year dd experimented with 10w40. they went back to straight 40.oil mark aprox 3/4 inch below oil pan gasket- some dipsticks got swapped out without checking oil level mark. If engine is running cool that would be great. tuff old engines!!!
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Hi guys,
I’m happy to say I’ve not seen an oil slick, drips, drops or puddles under my bus. I run my bus at high idle for 10 to 15 minutes as I perform inside and outside checks.
I’ve not really been stuck in traffic for any amount of time but it’s been my understanding you can stay at low idle unless there’s a change in temperature. It is also my understanding that you allow the engine to low idle for a minute before shutting down. Any disagreement with any of that?
Harry
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Spot on Harry on the let it low idle before you shut it down Those turbos get pretty hot and they cool down a little at idle with oil flowing through them. I usually keep mine at high idle all the time. Low idle at start for a minute or 2 until things get air up if down. Heard some folks say if no air can throw belts if they go high idle with no air. After pulling my ac compressor , Carrier 05g , to have seal installed, had to pull air cylinders to get belts off and on. Air bleed off valve wouldn’t allow cylinder to fully retract. Wised up going on as I pulled fitting on cylinder and hooked nitrogen I had sitting right there to pressure ac system to check for leaks, to cylinder to retract.
PS,
also heard if your 2 stroke ain’t leaking oil, it’s out!
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We’ve always joked about the 8V92 and how it seemed to slobber oil all over the place. But after having had one for 15 years I learned two things about that engine.
The first everyone agrees with and that is that there is no sweeter sounding engine on the face of the earth. Today when we have a large rally and someone pulls in with an 8V92, all conversation stops so we can hear the bus with that engine.
But its reputation for throwing oil is wrong. When I got my 87 coach the engine preceded Penske’s ownership of Detroit Diesel. Everyone was of the opinion that in its waning years Penske was able to get the company to put them together so they would not leak. It took me a while but within a year or so I was able to stop all the leaks on my 8V92, with the hardest to deal with and find being a small fuel leak. Once I got it leak free my engine cleaning efforts were to have my people dust and polish the engine occasionally. (OK, I am kidding about having my people do that).
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Glens said: “also heard if your 2 stroke ain’t leaking oil, it’s out! You know Glens, there’s nothing like a good sense of humor… And you have nothing like a good sense of humor!
Jon, I get comments on the sound of my 8V92TA Silver all the time. The last time was at a park where the spotter helping me back in said “I think that’s the best sounding diesel ever”! I remember reading about when the 8V92’s slobbered and what Detroit Diesel did to stop it. I don’t remember if I got that from you or Jim Lane but it was an interesting read. If I remember it was about the same time they included the DEDEC computer?
This is a good thread Mike, thanks.
Harry
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