| Author | Message | ||
| rodney (Invaders)
Registered Member Username: Invaders Post Number: 14 Registered: 3-2006 Posted From: 71.51.51.58 Rating: N/A |
? I WAS ABOUT TO MOVE MY BUS WHICH IS A 1980 MC9 CHARTER BUS. WE WERE ABOUT TO MOVE IT WHEN WE HAD TO KEP ON ADDING WATER TO IT THAN WHE I TRYED TO DRIVE IT IT STARTD GETING HOT BUT WE HAD AIR IN SYSTEM. THAN IT STARTED OVERFILLING WITH OIL AND WAS THIN BUT IT DIDNT GET MILKY AND SOMEONE TOLD ME TO CHECK TO SEE IF I HAD JUMPER LINE LEAKS AND YES I DID I RAN A TEST ON IT AND IT DID HAVE LEAKS ON FUEL JUMPER LINES BUT I COULDNT UNDERSTAND WHY WE THOUGHT IT WAS WATER MIXED IN OIL BUT WHEN WE WENT TO DRAIN IT NO WATER CAME OUT THE OIL DRAIN. JUST GREY WELL SILVER LOOKING LOOKING OIL. SO I DIDNT UNDERSTAND BUT IT WOULD CRANK STILL BUT WE GOT IT OFF ROAD AND JUST SHUT IT DOWN SO I TOOK THE OIL FOR A TEST AND THEY SAID IT WAS POS FOR WATER BUT ALL THE CAR MECHANICS I WOKED WITH SAID THAT IF THAT WAS WATER IN THERE IT SHOULD HAVE HAD A MILKY AND THICK LOOKING SO I DONT KNOW . DOES ANY ONE KNOW IF DIESEL FUEL WILL GET THE OIL TO TURN LIKE THAT? | ||
| George M. Todd (George_mc6)
Registered Member Username: George_mc6 Post Number: 217 Registered: 8-2006 Posted From: 207.231.81.59 Rating: N/A |
Rod, Diesel fuel from a leaking injector, or fuel jumper, essentially won't change the color of the oil. It will just THIN the oil to a point that it has no lubricating ability left. Then you have to replace bearings, cams, lifters, etc. In my opinion, you are describing water in the oil. If it is water, you will soon have stuck injector(s), as they are very precisely machined, and very sensitive. Smell your oil, if it smells like diesel, it has a lot in it, you may have two problems. A cooling system pressure test should be done now. Do us a favor, and turn off the caps lock. HTH, George | ||
| John MC9 (John_mc9)
Registered Member Username: John_mc9 Post Number: 429 Registered: 7-2006 Posted From: 66.217.105.187 Rating: N/A |
Re: 1. WE HAD TO KEP ON ADDING WATER TO IT 2. WHE I TRYED TO DRIVE IT IT STARTD GETING HOT 3. WE HAD AIR IN SYSTEM 4. IT STARTED OVERFILLING WITH OIL 5. TOOK THE OIL FOR A TEST AND THEY SAID IT WAS POS FOR WATER So..... Where's the mystery? It sounds like you're getting water into the crankcase. | ||
| Donn Reeves (Donnreeves)
Registered Member Username: Donnreeves Post Number: 6 Registered: 3-2007 Posted From: 69.115.76.219 Rating: N/A |
A simple test for water in the oil is to put a drop on a hot exhaust manifold. If it just smokes, it is usually ok. If it sizzles it has water in it. Donn | ||
| Jack Campbell (Blue_goose)
Registered Member Username: Blue_goose Post Number: 22 Registered: 5-2007 Posted From: 71.101.55.168 Rating: N/A |
Sounds like a crack in the Head. That puts water in oil, makes overheat and puts air in system. | ||
| Larry D Baker (Lbaker4106)
Registered Member Username: Lbaker4106 Post Number: 60 Registered: 5-2005 Posted From: 76.111.24.83 Rating: N/A |
I just went through that same problem with my 8V71 and found it was water in the oil and both heads were cracked. Larry 4106 | ||
| RJ Long (Rjlong)
Registered Member Username: Rjlong Post Number: 1259 Registered: 12-2000 Posted From: 67.181.189.94 Rating: N/A |
Since it's a 92 series, it could also be a blown O-ring liner seal. Any way you look at it, it's tear-down time. Sorry. . .  | ||
| rodney (Invaders)
Registered Member Username: Invaders Post Number: 15 Registered: 3-2006 Posted From: 71.51.51.58 Rating: N/A |
Thanks very much for the information. | ||
| Jeffrey Smith (Greenhornet)
Registered Member Username: Greenhornet Post Number: 36 Registered: 12-2006 Posted From: 76.110.30.60 Rating: N/A |
I had heard the same thing about the 6v92 series. The o rings on them are very sensitive to failing if the engine overheats. Post what the verdict is when you find out. | ||
| rodney (Invaders)
Registered Member Username: Invaders Post Number: 16 Registered: 3-2006 Posted From: 71.51.51.58 Rating: N/A |
Greenhornet i will let you know what i find out as soon as we get into this engine | ||
| john w. roan (Chessie4905)
Registered Member Username: Chessie4905 Post Number: 620 Registered: 10-2003 Posted From: 71.58.117.21 Rating: N/A |
How many times have we read about the same problems ending up being cracked head,s. Diesels don't tolerate being overheated much as the combustion temperatures get very high, especially if they are lugging at a low rpm on a long hill. Never trust to luck to just " make it up the rest of the hill " and I'll let it cool down on the other side. These engines are expensive to repair compared to a car engine, and are pretty reliable if taken care of. Unfortunately many new coach owners have little clue to the proper care of these engines as it could be their first diesel or large vehicle. |