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04-18-2016, 09:47 PM
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#1
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Senior Member
Monaco Owners Club
Join Date: Mar 2011
Posts: 888
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More oil leaks - Cummins C8.3
After successfully replacing my front main seal, I still have an oil leak that got noticeably worse on my last 500 mile trip. It emanates at the front (rear of coach) of the engine somewhere near the top of the oil pan. It does not look like the front seal or the timing cover gasket that were recently replaced.
After looking on QuickServe, I can only see two possible causes: leaking oil pan gasket, or leaking timing gear housing.
If it is just the oil pan gasket, do I need to remove the front (rear of coach) mount and cross member/tow hitch to get the oil pan to clear the underside of the engine and that cross member?
If I do remove the mount I will likely replace the front (rear of coach) vibration damper in the motor mount. Does that vibration damper just push in, or does it need a press?
Paul
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Paul Whittle
2005 Monaco Signature 45'
525 HP/1850 Ft Lb ISX-15/6-Speed Allison 4000
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04-18-2016, 10:03 PM
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#2
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Community Moderator
Join Date: Sep 2011
Location: Between the Oceans
Posts: 8,034
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tightening oil pan does not require removing anything. just give it a full around tightening. i did it last month, some were loose a bit.
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Steven & Polly
2000 Country Coach Intrigue 40' ISC 350
2018 Ford Explorer 4WD
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04-19-2016, 06:15 AM
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#3
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Senior Member
Monaco Owners Club
Join Date: Mar 2011
Posts: 888
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Yes. Sometimes we overlook the simplest solutions and go straight to the complicated ones. I will try tightening the oil own bolts first.
Thanks
Paul
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Paul Whittle
2005 Monaco Signature 45'
525 HP/1850 Ft Lb ISX-15/6-Speed Allison 4000
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04-19-2016, 10:38 AM
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#4
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Community Moderator
Join Date: Sep 2011
Location: Between the Oceans
Posts: 8,034
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also check oil pressure senders.
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Steven & Polly
2000 Country Coach Intrigue 40' ISC 350
2018 Ford Explorer 4WD
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04-19-2016, 04:23 PM
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#5
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Senior Member
American Coach Owners Club
Join Date: Jan 2011
Posts: 2,742
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Clean every thing off with Simple Green-or pressure clean and I mean Clean down to the paint- Tighten all of the bolts on the Front Cover--Oil Pan and try to isolate the leak or seepage, before even thinking about the removing the Front cover.
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Chuck
Brownsburg Indiana
1992 American Eagle-8.3C-450hp
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04-19-2016, 04:37 PM
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#6
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Senior Member
Monaco Owners Club
Join Date: Mar 2011
Posts: 888
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I already had the front cover off when I replaced the front main seal.
I will get it all clean and see where it is coming from.
Paul
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Paul Whittle
2005 Monaco Signature 45'
525 HP/1850 Ft Lb ISX-15/6-Speed Allison 4000
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04-19-2016, 05:02 PM
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#7
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Senior Member
American Coach Owners Club
Join Date: Jan 2011
Posts: 2,742
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Didn't you just do the Front Cover and Ba-lancer removal on here to replace the seal a few weeks ago ?
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Chuck
Brownsburg Indiana
1992 American Eagle-8.3C-450hp
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04-21-2016, 03:48 PM
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#8
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Senior Member
Winnebago Owners Club Solo Rvers Club Freightliner Owners Club
Join Date: Jan 2007
Location: Pahrump, NV
Posts: 479
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Did exactly what you are doing only it was a CAT 3126E. Turned out to be the timing gear cover but looked like a front main seal or an oil pan gasket. Both replaced and leak got worse. Finally removed the radiator and cleaned the engine and low and behold, there it was. Lot of work for a $40 gasket.
Rich
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2004 Horizon 40AD/ISC 350/2012 SILVERADO or 2008 Chevy HHR/Demco/Vmspc/2013 Polaris RZR
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04-22-2016, 04:17 PM
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#9
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Senior Member
Country Coach Owners Club
Join Date: Jan 2006
Location: Northern California
Posts: 5,868
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Quote:
Originally Posted by pwhittle
After looking on QuickServe, I can only see two possible causes: leaking oil pan gasket, or leaking timing gear housing.
Paul
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Cummins West quoted me $1700 about 10 years ago to replace the gear cover and gasket. They said it was a common leak issue with the C8.3L.
One member of these forums suggested I spray the back of the gear cover with brake cleaner several times. Then spray some PermaSeal stuff on the back at least two times.
I spent the $6 and followed the suggestion. No leaks since.
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Dean
1995 38' CC Magna #5280 **** Sold after 21 years of enjoyment.
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04-22-2016, 04:39 PM
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#10
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Senior Member
Join Date: Dec 2014
Posts: 583
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Quote:
Originally Posted by deandec
Cummins West quoted me $1700 about 10 years ago to replace the gear cover and gasket. They said it was a common leak issue with the C8.3L.
One member of these forums suggested I spray the back of the gear cover with brake cleaner several times. Then spray some PermaSeal stuff on the back at least two times.
I spent the $6 and followed the suggestion. No leaks since.
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Do you recall specifically what sealer you used. I found Permaseal for pools, Permaseal for roofs, for concrete, for dental repairs, etc.. The only automotive Permaseal I saw was a car wax.
Do you mean the stuff that makes a boat out of an old screen door?
Matt B
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Matt B
1998 Foretravel U-320
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04-22-2016, 09:25 PM
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#11
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Senior Member
Monaco Owners Club
Join Date: Mar 2011
Posts: 888
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When I recently replaced the timing gear cover (not housing) gasket, I used Permatex Ultra Grey RTV.
I don't think the cover gasket is leaking, but will know more this weekend when I clean it up and look closer.
Paul
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Paul Whittle
2005 Monaco Signature 45'
525 HP/1850 Ft Lb ISX-15/6-Speed Allison 4000
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04-23-2016, 08:02 AM
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#12
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Senior Member
Join Date: May 2012
Location: Spring Valley AZ
Posts: 1,226
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FWIW my 5.9 was seeping oil from the turbo oil return line.
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Don, Mary and Spooky
'00 Bluebird Skoolie Conversion
Geo Tracker/Dodge Neon/Aprilia Scooter towed
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04-23-2016, 09:14 AM
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#13
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Senior Member
Outdoors RV Owners Club
Join Date: Oct 2009
Location: Manitoba,Canada
Posts: 2,789
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I had the same kind of leak a few years ago. Turned out it was the timing gear housing gasket leaking from the top of the housing just above the water pump. Then it would trickle down and end up messing up the front of the oil pan. I didn't want to tear the engine down to fix that!
I tried silicone, didn't work. Finally, I removed the water pump and anything else in the way. I cleaned and cleaned and applied a nice caulk layer of Loctite 'The Right Stuff'. It's much like a silicone, but it's made to totally replace gaskets in engine assembly applications. It might have some polyurethene in it. I don't know. All I do know, it fixed it and I didn't have to spend a bunch of money to do it. Whew!
Jim
__________________
2016 Creekside 23RKS
2012 Ram 2500 Laramie 4X4 Cummins 6.7L
Canada, eh?
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04-23-2016, 09:24 AM
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#14
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Senior Member
Country Coach Owners Club
Join Date: Jan 2006
Location: Northern California
Posts: 5,868
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Quote:
Originally Posted by oldmattb
Do you recall specifically what sealer you used.
Do you mean the stuff that makes a boat out of an old screen door?
Matt B
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This looks like the stuff I used back then. It has gotten more expensive!
Permatex Spray Sealant (not Permaseal, my bad)
http://www.amazon.com/Permatex-82099...ct_top?ie=UTF8
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Dean
1995 38' CC Magna #5280 **** Sold after 21 years of enjoyment.
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