| Author |
Message |
CJ Munn (156.34.211.1)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, October 03, 2004 - 6:02 pm: | |
On our way home today, about 5 miles from home, the motor in our coach started acting bad. It had a little vibration and lost a little power. When we pulled into our yard we noticed that the toad and the rear of the bus was covered in a gray color film. When we checked the oil in the crankcase we found there was some diesel fuel mixed in there.
Anybody ever experience something like this? The DD6V92 only has 2300 miles on the complete rebuild and has been working soo good. Is there anything that a person should look for?
Thanks,
Cedric Munn |
TWO DOGS (65.177.145.60)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, October 03, 2004 - 6:18 pm: | |
stuck injector |
TWO DOGS (65.177.145.60)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, October 03, 2004 - 6:25 pm: | |
rack needs to be set & injectors checked for breakage...(just a guess)...don't drive it too far with thined down oil...oil will have to be changed after the problem has been fixed |
CJ Munn (156.34.211.1)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, October 03, 2004 - 6:34 pm: | |
Two Dogs,
Thanks for the information. I will start working on it in the morning. Some lucky it happened that close to home.
Regards,
Cedric |
Bill K. (165.121.82.214)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, October 03, 2004 - 6:34 pm: | |
Injector line cracked. Had one do that for me on a truck. I carry a spare. |
BrianMCI96A3 (67.77.37.160)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, October 03, 2004 - 7:20 pm: | |
I think Bill has his finger on the place that I'd start, the fuel lines under the valve covers on Detroits are pretty famous for cracking on rare occaision and dumping fuel into the crankcase...
And yes, you are very VERY lucky to have caught this so close to home.
This particular mechanical mishap has been known to dilute the engine oil to the point of bearing failure.
Brian |
TWO DOGS (65.179.192.218)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, October 03, 2004 - 7:20 pm: | |
if the line cracked..diesel wouldn't be in the crankcase...(?)look for a broken spring on injector... |
Marc Bourget (209.142.38.81)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, October 03, 2004 - 7:24 pm: | |
Two Dogs,
Showing my ignorance, but if, as Brian says, the line is inside the valve cover, why wouldn't the diesel be in the crankcase?
Onward and Upward
Marc Bourget |
BrianMCI96A3 (67.77.37.160)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, October 03, 2004 - 7:35 pm: | |
It is a rare thing, but as Bill demonstrates I'm not the only one here that is aware of this occuring...
And yes, it will dump a bunch of fuel if it isn't caught.
Brian |
Jim Ashworth (Jimnh) (172.173.181.180)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, October 03, 2004 - 8:48 pm: | |
Another possibility is the loosening of one of the nuts on the ends of the injector lines. It doesn't take long to contaminate the oil. DD recommends changing out bearings on the 8V92 if this happens, but I don't think 5 miles would matter. Dump the oil when the leak is fixed.
Jim |
John Rigby (24.174.238.253)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, October 03, 2004 - 8:54 pm: | |
I had simular problem 2years ago with my 671. When I reinstalled the head, I did not change out the fuel cross overs. I had one leak fuel into the head which ended up in the crank case.I am surprised you did not see the oil pressure drop, this happens when the oil is being diluted down by deisel.
When you find the problem run a oil analizer test on the oil after say 1000 miles and see if you have damaged anything.
Who did the complete rebuild?
John |
Bill K. (209.86.75.83)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, October 03, 2004 - 9:12 pm: | |
When this happened to me I noticed oil out the exhaust the truck had side pipes to above the cab, and oil was dripping at the flex pipe where it turned upward. The eng. was a 8v71 so I pulled the value covers and found one of the injector lines had a crack, I replaced the line and changed the oil, and for some time after this the oil stayed very clean and not black like usually after a coupl of hours running. This must have really cleaned thing up. But I must have caught it in time. This was several years ago, and the truck still runs fine with the same eng. If Iam not mistaken DD has a updated line for this application. |
jimmci9 (209.240.205.61)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, October 03, 2004 - 10:26 pm: | |
injector jumper lines are one-time-use only....and should be replaced any time they have been removes... i can find this in a dd service manual if you want.... i use a hand primer pump on the head side of the secondary fuel filter... and pinch the return line off... pump up to about 70 psi.. look for leaks... if there are any cracked fuel jumpers, you'll see the clean diesel washing the oil off... |
FAST FRED (4.245.212.45)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, October 04, 2004 - 5:41 am: | |
MY Guess,
Either a cracked jumper line , or an overtightened nut on either end of the jumper.
There is a TORQUE spec for these , yet too many "mechanics" dont even own a torque wrench.
A half dozen jumper lines should be in most DD repair kits , cause the SAME "mechanic" probably did them all!
Pull the valve cover and you may see a "clean river" where the fuel washed the lube away.
If not wipe all really clean & look carefully , last resort is to use paper towel strips wrapped on each jumper nut & look for fuel after a 5 min idle.
I would definatly change the oil & filter , after you find the leak.
FAST FRED |
John Rigby (24.174.238.253)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, October 04, 2004 - 6:23 pm: | |
Yes do exactly what Jimmci9 he nows his stuff when it comes to engines.
John |
Henry R. Bergman, Jr. (Henryofcj) (63.224.197.10)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, October 04, 2004 - 6:59 pm: | |
Diesel fuel gets from the head into the crankcase like the motor oil does.
Any leak on or in or around the injectors dumps the leaking fuel into the surrounding motor oil.
Then it works its way down thru the mill eventually getting into the oil pan. |