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06-05-2016, 04:30 PM
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#1
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Senior Member
Join Date: Nov 2011
Posts: 179
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Rear Main Oil Seal Leak 8.3 Cummins
Has anyone had to have the rear main oil seal replaced the their 8.3 Cummins? I have a small leak from mine but it is just enough that if I am towing for a few hundred miles it eventually makes a mess on the front of the toad. I am curious as to how much it cost.
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[SIGPIC][/SIGPIC]2005 Newmar Kountry Star DP
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06-05-2016, 04:45 PM
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#2
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Senior Member
Join Date: Nov 2005
Posts: 7,400
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Might be your main seal but are you sure--hard to imagine an RV wearing out a main seal on a Cummins? Always get confused with front vs rear--I take rear to mean the end mated to the tranny???? My diesel fuel lift pump was leaking [not uncommon] and was washing dirt/oil down to the area between the engine and tranny bell housing--even Cummins said it was a rear main--not, couple turns of the screw caps on the lift pump and issue was solved....
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Old Scout
2015 IH45 Foretravel
2003 Alpine 40' MDTS [Sold]
New Braunfels, Texas
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06-05-2016, 07:31 PM
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#3
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Senior Member
Join Date: May 2016
Location: St. Maries, Idaho
Posts: 959
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Quote:
Originally Posted by Old Scout
Might be your main seal but are you sure--hard to imagine an RV wearing out a main seal on a Cummins? Always get confused with front vs rear--I take rear to mean the end mated to the tranny???? My diesel fuel lift pump was leaking [not uncommon] and was washing dirt/oil down to the area between the engine and tranny bell housing--even Cummins said it was a rear main--not, couple turns of the screw caps on the lift pump and issue was solved....
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I agree with Old Scout, mine did the same. I installed a new fuel pump.
Bill
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2003 Country Coach Intrigue 36'
Cummins ISL 400
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06-05-2016, 08:06 PM
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#4
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Senior Member
American Coach Owners Club
Join Date: Apr 2016
Location: North Florida
Posts: 2,474
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Rear main seal leak in modern engines are pretty rare. Not saying it can't be but It should be double checked for any leaks. Best practices call for cleaning engine all over, use brake kleen to spread off common leak areas, with coach on clean parking area, run engine at high idle, say 1200 rpm with cruise and every so often slide under and look for leaks.
Does your engine have an open blow-by hose on side of block just by oil filter? There's a few threads here on how to deal with the slobber .....fuel lift pump is also a commn one
To answer your question, I'd say rear main (requires transmission R&R) would be a few K $
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1999 American Eagle
ASE med/heavy certified technician
ASE advanced diesel certified
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06-08-2016, 04:43 AM
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#5
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Senior Member
Join Date: Nov 2011
Posts: 179
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Thanks everyone. I did look in that area but will take a much harder look at it again.
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[SIGPIC][/SIGPIC]2005 Newmar Kountry Star DP
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06-08-2016, 06:25 AM
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#6
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Senior Member
Monaco Owners Club
Join Date: May 2012
Location: DFW, Tex-US
Posts: 6,196
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We did have an oil leak and Cummins fixed it in a day.
Don't recall where it was, but because I was still under drive train warranty, the cost escapes me
Can look at paperwork tonight to see
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'11 Monaco Diplomat 43DFT RR10R pushed by a '14 Jeep Wrangler JKU. History.. 5'ers: 13 Redwood 38gk(junk!), 11 MVP Destiny, Open Range TT, Winn LeSharo, C's, popups, vans, tents...
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06-08-2016, 09:10 PM
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#7
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Member
Join Date: May 2015
Location: Illinois
Posts: 54
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I thought I had a rear main seal leak. That is where the oil was accumulating. I cleaned everything up real good. Ran the engine and got under there and watched. Turned out to be a cracked dipstick tube. Cracked right at the block. Much easier to fix than rear main seal. Cummins C8.3 1998.
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09-05-2016, 09:45 AM
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#8
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Junior Member
Monaco Owners Club
Join Date: Apr 2016
Posts: 11
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Very odd, I purchased a 2008 Monaco Diplomat 35,000 miles 400 ISL had freightliner look at it they told me it was weeping oil, dripping from the bottom of the bell housing I wanted it fixed before purchasing so the owner agreed $ 2500.00 drove 100 miles huge leak cummins repaired it $ 4500.00 still leaking what is wrong
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09-05-2016, 11:48 AM
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#9
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Senior Member
Join Date: Jun 2012
Location: AB
Posts: 7,587
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Quote:
Originally Posted by DeeGee57
Very odd, I purchased a 2008 Monaco Diplomat 35,000 miles 400 ISL had freightliner look at it they told me it was weeping oil, dripping from the bottom of the bell housing I wanted it fixed before purchasing so the owner agreed $ 2500.00 drove 100 miles huge leak cummins repaired it $ 4500.00 still leaking what is wrong
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This sounds familiar. Is this unit 16? If so, I'd be happy to have a look.
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2019 Unity LTV CB, pushed by a 2013 Honda CRV, BlueOx Baseplate, Aventa Bar & Patriot Brake
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