I saw a few other threads on this topic, but figured I'd share my experience today. I'll also mention this happened the day I bought it while test driving it, it shutdown for low oil.. then fired back up never to happen again... until today.
I started the day working on building our dinette, but figured it was so nice, why not fire up the ol 2 stroke. It warmed up fine, building air, then as I was going to shut it down.. it shut down on it's own with the Low Oil light on.
I checked the back, still read on the dip stick, but it's hard to get a good reading after it's been running.
Once the air bled out enough the shutdown cylinder released and I could start it from the back just fine, I looked at the oil gauge there, pressure was good at 50-60PSI.
I haven't changed the oil since i bought it last year and had 9 gallons of Delo 100, figured why not today. I pulled 4.5 Gal from the pan, letting it sit for 30 minutes. That seems low to me. I recall seeing 6-8 gal recommended.
I put in 6 Gal, manually depressed the shutoff cylinder and cranked it for 10-15 seconds to let the oil pump around everywhere before firing it up. I let it air up again until the Fast Idle kicked in and it didn't shut down for low oil.
I should mention it's parked on a slightly sloped driveway, facing the front of the bus, so the engine is the highest. 6v92 on a 1982 MC9 .
I'm heading out on an overnight trip 100 miles away next weekend, I hope my troubles are behind me. Was it really just low oil? or should I check for something else?
Does that have a low oil level sensor? I thought it was a low oil pressure light.
The Kysor senders get corroded and need to be removed a cleaned sometimes
Quote from: chessie4905 on March 17, 2018, 04:19:02 PM
Does that have a low oil level sensor? I thought it was a low oil pressure light.
Red light just says "low oil" I'm thinking it was the level, because the pressure both on the dash and the engine read good before it quit.
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Quote from: luvrbus on March 17, 2018, 04:37:14 PM
The Kysor senders get corroded and need to be removed a cleaned sometimes
Where are those?
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If it truly is a low oil level sensor, there should be a sensor screwed into side of oil pan.
Checked my GM operator's manual. Light illuminates " low oil ". Means oil pressure dropped below 8 psi. If coach has the optional alarm system, it will shut down engine. An overide switch is included to bypass shutdown to be able to pull off road to safety.
I never seen a low oil level sensor on a bus. Should be for sure a low oil pressure sensor who is defect.
I am thinking he has a Cadillac/Kysor system because 1982 is too early for the DDEC even a bad ground can shut the engine down with a Kysor system with good oil pressure,never saw a Kysor system with a low oil shut down before though
Misdiagnosis???
How did you decide the auto-shut down isbeing triggered by the oil?
As soon as auto-shut down engages, the warning lights all come on. Driver says WTF... looks at dashboard and makes diagnosis based on normal engine off presentation...
It's your bus, why do you need that (profanity deleted) auto-shut down? Those were to defend the capital from uncaring labour,who would keep. driving with warning lights lit, and alarms sounding.
Remove it, solves this problem, and then when an overheat happens climbing a mountain pass, and the pull off is another 500 ft up the hill, you can decide to make it, instead of the auto-stop taking that choice away, and in the middle of a shoulderless road you come to a stop...
Happy coaching!
Buswarrior
In my experience, it's the light that comes on just before the shut down that's important.
When I started the 4108 last month, it would run for about 20 seconds and shut down. I did this a few times, and then I noticed that the 'water' light came on for a spit second before the shut down occurred. Sure enough, I was low on coolant and that is what caused the shut down.
Quote from: buswarrior on March 18, 2018, 05:24:28 AM
Remove it, solves this problem, and then when an overheat happens climbing a mountain pass, and the pull off is another 500 ft up the hill, you can decide to make it, instead of the auto-stop taking that choice away, and in the middle of a shoulder-less road you come to a stop...
Happy coaching!
Buswarrior
not in a million years on my money,
i don't care where it shuts down
and i won't even wish i could get 500 feet up the mountain or to the shoulder
and if a wrecker and all the kings horses and constables are needed so be it.
having a parachute with no ripcord...nope.
Those systems the light comes on at 205 degrees and shut down depends on what degree of alarm stat,the 6v92 should shut down at 210 degrees then is too late most of the time it just sets and cooks itself not running
Called ol' Gumpy to pick his brain, he suggested, like others, that it might not be oil related, actually probably isn't. The light just came on because when the master switch is on, there is no oil pressure, so the light turns on.
It's some sensor that is being finicky though, My next move is getting it into a condition where it shuts down, then disconnect sensors until the shutdown cylinder releases right?
I'll add that the indicated engine temp was still 100-110 (just airing up / fast idle in the driveway) , not even close to shutdown temp, but it's a rogue sensor anyway.
I know where the mechanical Oil Pressure gauge is, and there are a few wires from from that area. Gumpy mentioned temp sensors on each head as well. Anything else?
Fired it up today, she wasn't happy, didn't get a chance to plug it in first.
Anyway, I found a loose wire on the passenger side head. Turns out once it was up to pressure, and if I grounded the lead, it would shutdown. I found a nut that first the threaded end and re-attached it.
I think I'm good now. I'll still try and stretch it's legs later today, it's been a while.
Manual says 32 Qt = 8 Gal, so that should barely show up on the dipstick. The DD likes to spit extra oil out till it reaches mid-line on the stick, don't tow your white Lexus for a while.