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#2451396 - 02/13/18 06:39 PM Leaking Rear Main
dart4forte Offline
I Live Here

Registered: 01/31/03
Posts: 14221
Loc: Mesa, Arizona
Rear main seal is leaking on my 07 5.9. Who else has had this problem. Costly repair?

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#2451410 - 02/13/18 07:15 PM Re: Leaking Rear Main [Re: dart4forte]
moparpollack Offline
Lil Herman

Registered: 11/13/05
Posts: 14519
Loc: 85086
Originally Posted By dart4forte
Rear main seal is leaking on my 07 5.9. Who else has had this problem. Costly repair?


$1,000,000 wave Hope you are feeling better!
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67 Coronet, 68 Roadrunner, 69 Super Bee, 69 Coronet 500 convertible, 70 Roadrunner Post, 79 D150 360, and a severe case of Mopar a,d,d

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#2451659 - 02/14/18 11:07 AM Re: Leaking Rear Main [Re: moparpollack]
dart4forte Offline
I Live Here

Registered: 01/31/03
Posts: 14221
Loc: Mesa, Arizona
Originally Posted By moparpollack
Originally Posted By dart4forte
Rear main seal is leaking on my 07 5.9. Who else has had this problem. Costly repair?


$1,000,000 wave Hope you are feeling better!


At least its not 2 mil.

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#2451676 - 02/14/18 11:56 AM Re: Leaking Rear Main [Re: dart4forte]
larrymopar360 Offline
pro stock

Registered: 01/07/11
Posts: 1281
Loc: Central Florida
Originally Posted By dart4forte
Rear main seal is leaking on my 07 5.9. Who else has had this problem. Costly repair?
What vehicle is it in? Going to depend on how much has to be removed to get to it. Parts are cheap, all labor. I have had lot's of LA 360's and a couple of Magnum 5.9 and a heck of a time keeping the rear main's from at least not seeping.
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Facts are stubborn things.

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#2451741 - 02/14/18 02:53 PM Re: Leaking Rear Main [Re: larrymopar360]
jerseybud Offline
mopar

Registered: 04/25/04
Posts: 643
Loc: Maine
Its gotta be a Cummins if its a 07.

There was a former Chrysler engineer selling a modified seal on ebay for several years but havn't seen it posted recently.

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#2451744 - 02/14/18 03:05 PM Re: Leaking Rear Main [Re: jerseybud]
larrymopar360 Offline
pro stock

Registered: 01/07/11
Posts: 1281
Loc: Central Florida
Originally Posted By jerseybud
Its gotta be a Cummins if its a 07.

There was a former Chrysler engineer selling a modified seal on ebay for several years but havn't seen it posted recently.
Oh that's right!
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Facts are stubborn things.

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#2452831 - 02/16/18 08:11 PM Re: Leaking Rear Main [Re: dart4forte]
a12rag Offline
top fuel

Registered: 04/23/07
Posts: 2070
Loc: Calgary, Alberta Canada
Are you sure it is rear main ?? Couple of oil changes ago on my 02Cummins, I thought it was rear main, but never knew there is a rear breather, similar to the front one . . . drained the bottle and all was good !

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#2453464 - 02/18/18 11:17 AM Re: Leaking Rear Main [Re: a12rag]
dart4forte Offline
I Live Here

Registered: 01/31/03
Posts: 14221
Loc: Mesa, Arizona
2007 5.9, oil accumulates then leaks past the small inspection cover on the bell housing. Definitely oil, not tranny fluid. Not a major leak however its something that needs to addressed.

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#2453618 - 02/18/18 05:48 PM Re: Leaking Rear Main [Re: dart4forte]
jerseybud Offline
mopar

Registered: 04/25/04
Posts: 643
Loc: Maine
Mine does that and its the tappet cover. I dread taking all that crap apart to fix that stupid little gasket

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#2457716 - 02/25/18 11:33 PM Re: Leaking Rear Main [Re: jerseybud]
70Cuda383 Offline


Registered: 10/07/03
Posts: 21344
Loc: Marysville, O-H-I-O
The valve cover is easy. 10mm bolts, 6 of them if I recall.
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#2461585 - 03/05/18 02:53 PM Re: Leaking Rear Main [Re: 70Cuda383]
dart4forte Offline
I Live Here

Registered: 01/31/03
Posts: 14221
Loc: Mesa, Arizona
Well, its been awhile and I think I slowed the leak to bide some time. I added a small bottle cap of dot 3. Not a lot but after about 500 mile seems to have stopped the leak. Got a price of $900 to change it out so eventually it will have to be done.

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#2461843 - 03/05/18 11:01 PM Re: Leaking Rear Main [Re: dart4forte]
Guitar Jones Offline
master

Registered: 12/18/09
Posts: 9632
Loc: in a cattle trailer down by th...
Originally Posted By dart4forte
Well, its been awhile and I think I slowed the leak to bide some time. I added a small bottle cap of dot 3. Not a lot but after about 500 mile seems to have stopped the leak. Got a price of $900 to change it out so eventually it will have to be done.


Probably not a good idea. Now that the brake fluid has swollen the leaking rear main it has also swollen the seals that weren't leaking. Expect to have to replace all the rubber seals now including the valve stem seals. Not smart.

The Cummins uses a one piece rear main seal so the transmission has to come out.
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W5 408 cid, 1.324, 6.155 @ 110.34, 9.756 @ 134.67. Oh yeah, it's all Mopar too, 904 trans and an 8.75 rear!!

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