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  #1  
Old 03-08-2012, 12:18 AM
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Rear main seal leak

Apparently have a bad rear main seal leak on my 79 300td --

After it sits over night or just sitting after driving it -- it will leave a 5-6" diameter puddle...

With the engine completely cleaned off -- my mechanic and I looked closely at it up in the air and confirmed my worst nightmare --

So, in 09 I had a new/used tranny put in it -- and it has worked flawlessly. The car runs nice and it doesn't have too bad of rust.

About $1000 is probably what it'll take I imagine -- since the engine needs to be pulled, what else should be done? engine mounts?, other things?

Thanks for grieving with me a bit -- I was hoping it was going to be a easy fix...

todd
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1979 300TD - 700k+ (looking for a fold down 3rd seat)
2000 VW Eurovan MV - 140k
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  #2  
Old 03-08-2012, 12:22 AM
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How did you confirm a leaking rear main seal? It's easy to mistake an oil filter housing gasket leak for a rear main leak. Oil filter housing leaks are far more common. Also could be a valve cover gasket leak.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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  #3  
Old 03-08-2012, 12:29 AM
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As Kerry stated these leaks can appear to be rear main seal leaks:

oil filter housing gasket
valve cover gasket
headgasket

I have also heard there is a plug which plugs the oil gallery which is behind the flywheel, i have ONLY HEARD that it can leak. I have no proof though
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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

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  #4  
Old 03-08-2012, 01:14 AM
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That will cost you a bundle to have a shop pull the engine, slip in a seal, drop the engine back in and have it all buttoned up.

Here is a DIY write up.
PeachPartsWiki: Rear Crankshaft Rope Seal Replacement Without Removing Crank

All depends if you have the time and room, and if this is your only set of wheels.

Use one of those DIY car washes and clean off all the oil, then see if it is coming from up above.

Charlie
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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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  #5  
Old 03-08-2012, 05:20 PM
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Quote:
Originally Posted by kerry View Post
How did you confirm a leaking rear main seal? It's easy to mistake an oil filter housing gasket leak for a rear main leak. Oil filter housing leaks are far more common. Also could be a valve cover gasket leak.

They cleaned everything off the bottom of the engine and all of us looked at a day after driving it around...the drips/wetness is all right in between the tranny and the engine (sorry, don't know the correct parts here)...they didn't find any other leaks that were putting out that kind of oil up higher...but, anything is possible I guess -- sure wish it were...

Everyone around here is pretty hesitant to do it -- so am I -- over $2k is out of the ballpark...

I'll keep driving it--- keep it parked in the same place in the street to minimize the Exxon effect....if you think I should get a second opinion, please let me know...or anything else you might think..

THANKS for the replies..

todd

PS -- any low mileage 300TDs around that you know of for sale? I sure like the wagons...
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2000 VW Eurovan MV - 140k
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  #6  
Old 03-08-2012, 10:23 PM
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Quote:
Originally Posted by 79Mercy View Post
As Kerry stated these leaks can appear to be rear main seal leaks:

oil filter housing gasket
valve cover gasket
headgasket

I have also heard there is a plug which plugs the oil gallery which is behind the flywheel, i have ONLY HEARD that it can leak. I have no proof though
The oil filter housing gasket died last winter and has a new one now...the valve cover gasket is new too just a few months ago when I adjusted the valves...headgasket could be looked at again...I think I'm going to have someone else take a close look at it for a second opinion...even though it is pretty convincing that it is the rear main seal, I have a bit of faith that it could be something else...so hope so...there is no way I can come up with 2k...or even justify it given all the other little things I need to attend to...

thanks
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  #7  
Old 03-08-2012, 11:14 PM
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700K on that engine? not bad for the rear main to hold that long...
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  #8  
Old 03-09-2012, 12:11 AM
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if its got 700k on it, and you can't afford the work.. maybe drop in some rear main seal stop leak? i mean, what else do you have to lose?
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  #9  
Old 03-09-2012, 07:30 AM
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Quote:
About $1000 is probably what it'll take I imagine -- since the engine needs to be pulled, what else should be done? engine mounts?, other things?
If it is high mileage it will be the "other things" that will drive it over $2k.
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  #10  
Old 03-09-2012, 08:37 AM
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Sorry to hear of your leak, but I LOVE to see that kind of high mileage....you are an inspiration to the rest of us!

If it were me, I would probably try a stop leak product first.
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06 E320 CDI "Benson", Platinum Blue, 174k mi
06 E320 CDI "Rutherford", Black, 144k mi
91 300D "Otis", Smoke Silver, 128k mi
98 E300 "Murray", Silver, 128k mi, Stage 2 Rocketchip chip tuned, under son's care

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2002 Honda Odyssey 241k mi (want to name it "Homer," wife won't let me)
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  #11  
Old 03-09-2012, 08:59 AM
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Quote:
Originally Posted by shertex View Post
Sorry to hear of your leak, but I LOVE to see that kind of high mileage....you are an inspiration to the rest of us!

If it were me, I would probably try a stop leak product first.

OK -- I've asked around about doing that and no one said that it would do any good-- but I don't have anything to lose at this point. Anyone have any recommendations for a good stop leak???

Also -- on the mileage --- I think it is actually around 300k --- after reviewing old maintenance invoices, I noticed the mileage recorded as being the same from year to year...and the odo doesn't work ... but once and a while will rotate a the hundreths place...then another...it is definitely not sure --- I was wanting to believe it for sometime..

Anyway, thanks for any info on the stop leak..

todd
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  #12  
Old 03-09-2012, 09:02 AM
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Quote:
Originally Posted by peachykeen View Post
OK -- I've asked around about doing that and no one said that it would do any good-- but I don't have anything to lose at this point. Anyone have any recommendations for a good stop leak???

Also -- on the mileage --- I think it is actually around 300k --- after reviewing old maintenance invoices, I noticed the mileage recorded as being the same from year to year...and the odo doesn't work ... but once and a while will rotate a the hundreths place...then another...it is definitely not sure --- I was wanting to believe it for sometime..

Anyway, thanks for any info on the stop leak..

todd
From different things I've read (I have no first-hand experience), I would try a Lucas Oil product.

Interesting about the odo....
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06 E320 CDI "Benson", Platinum Blue, 174k mi
06 E320 CDI "Rutherford", Black, 144k mi
91 300D "Otis", Smoke Silver, 128k mi
98 E300 "Murray", Silver, 128k mi, Stage 2 Rocketchip chip tuned, under son's care

Twelve other MB's owned and sold
2002 Honda Odyssey 241k mi (want to name it "Homer," wife won't let me)
1961 Very Tolerant Wife
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  #13  
Old 03-09-2012, 09:15 AM
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Location: Out in the Boonies of Hot, Dry, Dusty, Windy Nevada
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The spedo would be the easy fix.

Charlie
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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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  #14  
Old 03-09-2012, 05:59 PM
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that stop leak stuff won't work on a rope seal
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  #15  
Old 03-12-2012, 01:25 PM
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Quote:
Originally Posted by kerry View Post
How did you confirm a leaking rear main seal? It's easy to mistake an oil filter housing gasket leak for a rear main leak. Oil filter housing leaks are far more common. Also could be a valve cover gasket leak.

Hi again,

Had another shop take a look and re-confirm that it is indeed leaking from the rear main seal -- a shop that is willing to do the work is telling me about $2900 for the job.

No way I have that -- so, just keep driving and adding oil? If anyone is interested in near MN -- I'm considering selling it as is.

Thanks for any other tips/advice,

todd
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2000 VW Eurovan MV - 140k
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