| Author |
Message |
christopher
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, September 08, 2005 - 12:40 pm: | |
engine leaks from bellhousing plug on my 692. just had rear main seal replaced. if not a new bad seal then where can it be coming from?
thanx
chris |
Sammy (Sammy)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, September 08, 2005 - 3:56 pm: | |
What kind of bus do you have?
What type of transmission do you have?
Could still be the rear main seal if it wasn't replaced properly, hope they replaced the rear crankshaft sleeve (wiper) too. |
David Hartley (Drdave)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, September 08, 2005 - 6:46 pm: | |
If its attached to a V-730 it could be splashing from the PTO gear drive assembly. |
JR
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, September 08, 2005 - 9:09 pm: | |
Inside the bell housing are several bolts that have sealing washers on them. They could be loose and leaking. Were the bell housing bolts checked while the flexplate was removed?
My bet is that the seal is not correctly installed, or the wear ring is not installed, or incorrectly installed. There are also two sizes of seals for DD V92s. The oversized is used with a wear ring (steel sleeve that is installed in the seal surface of the crank about $30.) The standard is used on good cranks...which would be rare indeed. Don't reckon the sleeve seal is on a no-sleeeve crank? Another thing is that the Federal seal is teflon coated and installed dry. If lubricated, it's my understanding that they will leak. The seal is difficult to position, and may be displaced. Unless it was sealed in place, good chance it squeezed back out. On the teflon, a bit of teflon is wiped off onto the crank during initial revs and serves as a teflon on teflon surface. I just replaced my seal, but have not reinstalled the engine yet. Hope it doesn't leak. Did the installer use the correct tools to install the seal? It's difficult to get in place without them...not impossible. The seal is supposed to be checked for runout...something like 0.0015" max runout...that's tough to do.
Does it leak all the time? Or just when at high RPM? Either way, it has to come back out. I'd be there when the trans is pulled off the engine to see what there may be to see.
JR |
chris
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, September 08, 2005 - 9:37 pm: | |
sammy
mci5c w/a 640 auto
thanx chris |
Donald19952
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, September 09, 2005 - 2:28 am: | |
Before I would let them pull it out, I would research the proper installation tool (Seal Installer) required to do that job.....It is not a hammer.
THEN I would ask to see their Kent Moore Tool or it's acceptable variant.
Then I might let them try again.
Donald |
Jim Bob
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, September 09, 2005 - 5:12 pm: | |
DD also uses a different seal for right hand & left hand rotation cranks. One is black, the other orange. Difference is that they each have little "threads" on the seal lip that, if the proper seal is installed, "screw" the oil back into the pan. If the incorrect seal is installed, they leak worse than the old, leaky seal. (Don't ask how I know this!) |
JR
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, September 09, 2005 - 9:32 pm: | |
The orange seal is a RH rotation, and the black seal is LH. As stated, there are two sizes of each...one for use with a wear ring and one each for use on a non wear ring crank.
Aren't "V" drives LH rotation, and the "T" drives RH?
If the trans is removed and the seal is dry and in place (and the correct color), you'll know then that the oil is coming from something else. Bell housing gasket?
I'd be interested in knowing what you find leaking. I just replaced my rear main, but the engine didn't leak unless run at max RPM for an hour or so. Seal was worn and the outer lip fit loosely on the crankshaft. The "screw" thread part of the seal was still snug. Not sure I've corrected my problem yet. Soon find out. |
Tom Caffrey (Pvcces)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, September 10, 2005 - 12:34 am: | |
JR, not all vee drives are left hand.
For what it's worth.
Tom Caffrey PD4106-2576
Suncatcher |
Dale L. Waller (Happycampersrus)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, September 10, 2005 - 8:22 am: | |
Tom, you beat me to it, some v drives had what was called a Right-Hand Input Drive Adapter that went between the engine and trans. Why they all didn't have it is beyond me. Would have made everything simple with same rotation engines in all the buses |
Sammy (Sammy)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, September 10, 2005 - 8:29 pm: | |
Series 50 in a V drive config has the adapter that was mentioned previously. The Series 50 is only a RH rotating engine.In some cases you'll find an Allison V731 driven by the Series 50 with this adapter between them - Nova bus (RTS). |
JR
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, September 10, 2005 - 9:34 pm: | |
I was unsure of the " all V drive LH" thing...that's why the question mark behind that bit. That begats another question....would any 50 series V drive engine, since all 50s are RH, bolt up to an HT748? I'm aware of the operating RPM differences, but otherwise would a transit 50 bolt onto the transmission? Were 50 series packaged with HT748s? |
RJ Long (Rjlong)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, September 10, 2005 - 9:57 pm: | |
Greyhound did a whole series of MC-12 conversions from 6V92TA/HT740 to Series 50/HT-748s. Plus MCI built a whole bunch of MC-12s for 'Hound with that powertrain.
FWIW. . . |