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Author Topic: good news, bad news on my 8v92?  (Read 4047 times)
white-eagle
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« on: December 21, 2010, 08:18:36 PM »

The good news is that my tow vehicle has an excellent rust preventative undercoating every time i pull it behind the bus, about a gallons worth of 40wt rotella.  the bad news is that is seems to be coming from the gasket on the engine block end plate just above the starter.   When i took it in to have the starter checked, or the hoses just above it repaired or replaced, the garage blew it clean and then checked where the leak was.  According to them, the gasket was put on with "silicone"? which is incorrect.  that's why it's now leaking after whenever the last overhaul was by a PO. (at least 5 years and 50,000 miles ago.).  They couldn't do the repair themselves, but ....

Any way to repair this, short of taking it apart and applying new gaskets?  suggestions?  Oil isn't that expensive, but it ain't cheap and i really don't need further rust protection on the tow.

for those of you that wish to think this over, i plan to be in arcadia for the rally by Monday if i can find enough oil to get there.  It's at least a 3 day run, so at least 4 gallons if it doesn't get worse on the way.
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Tom
1991 Eagle 15 and proud of it.
8V92T, 740, Fulltime working on the road.

Fran was called to a higher duty 12/16/13. I lost my life navigator.
Ace
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« Reply #1 on: December 21, 2010, 08:22:07 PM »

Tom if you can make to Lakeland, bring it to the shop and let Joe get on it! Shouldn't take that long to fix and you can still make the rally with no worries!

Better to fix IT now than to fix a lot more later on!
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Ace Rossi
Lakeland, Fl. 33810
Prevost H3-40
Geoff
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« Reply #2 on: December 22, 2010, 05:15:01 AM »

I've had good results on oil leaks using an epoxy made for gas tank leaks.  A couple of bucks at Auto Zone.  It is a LOT of work to change out the end plate gasket.
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Geoff
'82 RTS AZ
bevans6
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« Reply #3 on: December 22, 2010, 05:16:02 AM »

Changing the engine block to rear plate gasket will mean completely disassembling the back of the engine, pulling the bellhousing and all of the gears.  The engine will have to be out, and the tranny will be off, as will all the rear accessories.  Not a job I would want to do in a hurry.  Mind you, I am doing much the same thing with my engine swap.  I'll be stripping both engines down to the bare block, front and rear.

Good luck!

Brian
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1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
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luvrbus
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« Reply #4 on: December 22, 2010, 06:39:58 AM »

Tom, before you go into panic mode have somebody check your blower coupling and the blower supply oil line when those go bad it will look like the plate is leaking you may get lucky my friend,that 20 dollar gasket cost a bundle to replace as Brian said,clean the breathers on the engine if it is the gasket it will slow it a little  



good luck
« Last Edit: December 22, 2010, 06:47:56 AM by luvrbus » Logged

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bobofthenorth
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« Reply #5 on: December 22, 2010, 06:49:51 AM »

Look for the simple fixes first Tom cause that's a big one if you have to do it.  Make sure it isn't just blowing back off your slobber valve on that side.  My starter was pretty slimy all summer and I was subsidizing Shell big time until I got motivated enough to tighten the connections on my slobber valve on the starter side.  On the plus side, as you correctly pointed out, my POS FORD wasn't rusting. Mind you, most of the parts on it don't stay on long enough to rust but that's a whole 'nuther thread.
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R.J.(Bob) Evans
1981 Prevost 8-92, 10 spd
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bevans6
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« Reply #6 on: December 22, 2010, 06:54:21 AM »

plus just tighten all of the accessory bolts back there.  I found a big part of my leak was probably the fact that three of the bolts holding the air compressor on where only finger tight.  Yeah, they are a total pain to get a wrench on, but the oil was running down the back of the engine to where the starter is. 

Brian
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1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
Spicer 8844 4 speed Zen meditation device
Vintage race cars -
1978 Lola T440 Formula Ford
1972 NTM MK-4 B/SR
Busted Knuckle
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« Reply #7 on: December 22, 2010, 09:32:01 AM »

plus just tighten all of the accessory bolts back there.  I found a big part of my leak was probably the fact that three of the bolts holding the air compressor on where only finger tight.  Yeah, they are a total pain to get a wrench on, but the oil was running down the back of the engine to where the starter is. 
Brian

VERY COMMON PROBLEM!
I've seen it over and over again, on my coaches as well as other peoples too!
Tom if it were me that's the first place I'd check!
Grin  BK  Grin
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Busted Knuckle aka Bryce Gaston
KY Lakeside Travel's Busted Knuckle Garage
Huntingdon, TN 12 minutes N of I-40 @ exit 108
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Chopper Scott
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« Reply #8 on: December 22, 2010, 10:27:36 AM »

My pan was developing a leak when I checked the bolts. They were all loose. Pretty good advise!
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white-eagle
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« Reply #9 on: December 22, 2010, 06:05:09 PM »

Clifford, i will definitely check out the blower drain and slobber tube.  i would really love for that to be the issue instead of pulling the engine, tranny, etc.  i'm really not prepared for that expense just to fix a gasket, although i'd rather not have to pull the engine at all, for any reason.  But if it turns out we need to do that, there are some other things we'll service and tune up while we're there.

Brian, i already heard that, but thanks for confirming, Scott, all suggestions are welcome and i'm assuming i'll get more advice at the rally.  Bob, i'm pickin up some good stuff in case you are comin also.

BK, i probably should have picked you up.  We came down from Columbia, ky to TN 111 all the way to 27, then i24 to i75.  don't know how close that was, but probably not too far.  Lookin forward to seein ya agin.  ( note the KY/TN spelling) .
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Tom
1991 Eagle 15 and proud of it.
8V92T, 740, Fulltime working on the road.

Fran was called to a higher duty 12/16/13. I lost my life navigator.
luvrbus
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« Reply #10 on: December 22, 2010, 06:11:31 PM »

Tom to bad you are on the east coast I would help you but fuel to Az and time probably would cost more than you would save. Check the supply line it is on the very top of the engine

good luck
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white-eagle
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« Reply #11 on: December 22, 2010, 06:14:44 PM »

i should also mention we arrived in FL last nite.  6.3 mpg down from Ohio pullin the loaded Express Van behind 40,000 lb of Eagle.  Just a little over a gallon of oil since Chatanooga, at 65 to 70 mph.  i watched the oil pressure pretty close and it stayed right around 40.

hopefully, it is not worse and we can make it to Arcadia on another gallon or less.  fortunately, i have about 4 gal on board, cause i checked and there is none in Bushnell where we are.

Clifford, i'm going to be working in the Rocky Mt Natl park above Denver all summer.  Maybe we can at least meet somewhere.  i know that's not exactly close, but it's probably as close to AZ as i'll be for a few years.  thanks for the offer, but i'm hopin to get all this squared away before i tackle the Rockies.
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Tom
1991 Eagle 15 and proud of it.
8V92T, 740, Fulltime working on the road.

Fran was called to a higher duty 12/16/13. I lost my life navigator.
RickB
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« Reply #12 on: December 22, 2010, 08:07:02 PM »

I think the #1 culprit for oil leaks in that area is the gear driven oil cooled alternator. It's super heavy and with all that weight just hanging out a good foot from the bellhousing they flex and crack alot. The way I identified it was brake cleaner and a rag to get it really clean, start it up and get as close as you can with a good treble light. I would recommend seeing if someone could bring you an aftermarket support for the back of the alternator to Arcadia. I bought one from Brian Diehl a couple years back and I have no leaks coming from there anymore. I also would strongly recommend that if your compressor is not up to specs to have a rebuilt put on. Mine leaked like a sieve.

Good luck and I pray it's not your end plate. That would be the mother of all headaches. If it is and you end up doing it I've heard it's always recommended that you do the idler gear while you're in there.

Rick
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ccbmster
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« Reply #13 on: December 22, 2010, 09:31:10 PM »

hmmmmm I am told the alternator in my MC9 is leaking badly......
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86 MCI 102A3  MI/CA with SoCal being primary. 6V92 with Allison 740 Auto
82 MCI 9 8V71N with Allison 740 Auto..soon to be parted out or scrapped
tomhamrick
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« Reply #14 on: December 23, 2010, 06:09:01 AM »

Hi Tom,
I had a leak a few years back that I thought was this same gasket. Turned out it was the cross over pipe between the heads and all I did was tighten two hose clamps.

Tom hamrick
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Tom Hamrick
1991 Prevost H3-40 VIP
1981 Eagle 10
Forest City, NC
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