| Author |
Message |
Chuck Lott (Chuckmc8)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, January 04, 2006 - 10:14 am: | |
My 8V71 has an oil leak that I'm trying to fix, but I'm stumped. I'm hoping that someone here may have had a similar leak and repaired it-here's the poop-
I appears that the leak originates generally at the base of the blower/top of the block area. It fills the depressed areas in the top of the block (depressed areas are lower than the blower gasket mating surface, and there's one both in front of and behind the blower gasket mounting surface)
and then drips off down the ends of the block to the ground.
Speaking to Geoff Smith,(thanks!) He and I both thought the blower base gasket was torn, apparently a common error in installing the blower. So, after getting a new blower base gasket, yesterday, I tore it down and, viola! the base gasket is not torn, and the imprint on the gasket from the bottom of the blower seems to indicate the gasket is not the culprit.
So,I've looked for another likely suspect. The oil supply line appears OK, the rubber coupler for the blower drive is fine, and I checked the bolts on each end of the blower, and the gasket is visible around it's perimeter on both ends.
Hmmmmm.......But, it's a leak that puddles the ground when the bus sits and idles for a few minutes. (not airbox drips)
This engine had an out frame rebuild, and has about 2,000 miles on it now. The leak seemed to be getting worse.I would pressure wash the engine, drive 30 minutes and the oil trail is right back on the end of the block, where its dripping onto the ground. All I could tell with the engine together is it's originating somewhere I could'nt see, in the block valley area.
Help! Any ideas? thanks Chuck Lott |
John MC9
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, January 04, 2006 - 10:28 am: | |
How about making a big drip pan to fit under the engine
(to catch the oil), and a pump to pump the oil back in?
Ok... how about a pin-hole in one of the oil pressure lines
feeding the alternator, blower, etc? Is it possible the oil's
being sprayed upward (or sideways), then dripping down? |
Marc Bourget
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, January 04, 2006 - 10:30 am: | |
I'm not visualizing the 8V71 in my mind. I can remember a similar stubborn leak in a Chevy Small Block that resulted from a casting flaw (a porosity not a crack!) Is it possible you're in the area, looking at but not "seeing" the cause?
(This "can't see the forest for the trees" thing is something I'm frequently guilty of.)
The other puzzling, hard to detect leak I suffered from was from an oil pressure sender but I don't think such is located up top on an 8V71
FWIW |
Homer
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, January 04, 2006 - 10:51 am: | |
I had the same sounding leak and found it to be a seal on the blower shaft |
Chuck Lott (Chuckmc8)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, January 04, 2006 - 10:58 am: | |
here's a link to see photos-
http://groups.msn.com/July2004Busphotos/shoebox.msnw?action=ShowPhoto&PhotoID=160
this is my bus page, but I've recently added a few pics of other less tecnical projects
Chuck |
sylverstone (Sylverstone_pd4501864)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, January 04, 2006 - 1:56 pm: | |
chuck:
the 8v-71 in my scenicruiser does that.
with mine, it's because i have a 75 gph electric fuel pump on the bulkhead (my mechanical kept losing prime at the worst times). the mechanical pump, if i sit and idle too long, will leak and pool up on top of the block...
might be worth looking into.
-dd |
T. (Bluegrass)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, January 04, 2006 - 1:58 pm: | |
Chuck
I had a simular leak on my MC-7 and It was the rubber coupler for the blower drive I tightened It up and everthing was Ok after that, No more oil In the Valley |
motorcoach1
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, January 04, 2006 - 2:13 pm: | |
i see john has been replacing oil lines , this happened to me too , cracked line . the blower seal was a problem too i found it while trying to find out how fuel was getting in the engine oil. dahh restricted returne line and bad injector seal. hope that helps |
Dale Waller (Happycampersrus)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, January 04, 2006 - 5:24 pm: | |
Well Chuck that's a tough one.
Pressure wash it. Then watch to see what end of the blower the leak starts on.
If the leak is at the front of the blower, Check the govenor housing were it bolts to the blower. Also check to the fuel pump bolts & gasket.
If the leak is at the back of the blower, Check the blower end plate bolts and gasket. Check the large worm gear (radiator hose type)clamp at the rear plate cover seal. Also check that seal for cracks or tears or misalignment.
Check the blower drive gear support. It has a gasket and the 2 bottom bolts have copper sealing washers. That's my Guess. People try to reuse those washers and they don't like to reseat.
If the oil appears to come UP from the engine end plate someone probably didn't get the cam bearings tightened and torqued right. Hope it ain't that.
Hope this helps.
Dale |
Leslie Robinson (Lesrmc9)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, January 04, 2006 - 11:51 pm: | |
I had a simular leak on my MC-9 and It was the rubber coupler for the blower drive [that 4" dia by 5" long thing] had a hole looked like a flat screwdriver slipped at onetime, as the hole was on the bottom, excellant place for a leak |