Oil Leak 560SEL; DIY seal replacement(s)? How? - Mercedes-Benz Forum

Go Back   Mercedes-Benz Forum > Mercedes-Benz Sedan Forums > W126 S,SE,SEC,SEL,SD,SDL Class
New User? Register - Forgot Password

BenzWorld.org is the premier Mercedes-Benz Forum on the internet. Registered Users do not see the above ads.
Like Tree1Likes
  • 1 Post By Rocket9k
Reply
 
LinkBack Thread Tools Display Modes
Old 11-01-2010, 02:02 PM   #1 (permalink)
BenzWorld Newbie
 
Date registered: Jul 2009
Vehicle: 1988 Mercedes Benz 560 SEL
Location: Champaign, IL
Posts: 4
Oil Leak 560SEL; DIY seal replacement(s)? How?

Throughout my two years of ownership, I have been aware that my 560 leaks oil. You can tell every space my car has been parked in because of the stains. For every long/highway trip I go on, I notice that the oil level falls incrementally on the dipstick. Moreover, during and after every long trip or hard driving, there is the omnipresent scent of WD-40 sizzling on the exhaust and cats; occasionally, there is even a slight plume of smoke that rises suspiciously from beneath the hood. I have been told that it is a "common problem on older Mercedes", and that "repairing it would cost more than the car is worth". I do not doubt either of these statements, and suppose I could leave it be for another several thousand miles or more (currently have about 138,500 miles) before addressing it. Yet I was recently faced with the grim reality of the situation when I took my 560 in for an oil change, and observed that most of the underside of the car, including the floor pan and exhaust system, was coated in oil from it streaking back from the leak during fast driving. Duh. But this sight and the constant smell of burning oil immensely bothered me, so I began doing some research into a DIY project to replace the two main areas I believe to be the source of my leak(s); the engine rear main seal, and the automatic transmission front seal. I have been told that the leak is at the head gasket (?), but I see no evidence of this as it appears that the leak occurs only where the engine meets the transmission. I would like to know more about how I can go about replacing the seals myself, as I would certainly save a ton of money by doing so, and am absolutely through with dubious Mercedes mechanics. I am somewhat familiar with the procedure to get to both seals, yet I am not entirely clear. If anyone can provide me with technical support or online shop manuals, it would be greatly appreciated. I will try and get some pictures of the leak situation as soon as I can.
Blue Steel is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 11-01-2010, 04:15 PM   #2 (permalink)
BenzWorld Elite
 
Date registered: Jan 2004
Location: St. Louis
Posts: 1,648
Have you replaced your valve cover gaskets? If not - do it.
NordRhein is offline   Reply With Quote
Old 11-01-2010, 05:11 PM   #3 (permalink)
CH4S Artist
 
Teutone's Avatar
 
Date registered: Sep 2004
Vehicle: 1985 500SEC, 1991 190E 2.6, bought 07/08 with 50k original miles.
Location: Los Angeles / Hannover Germany
Posts: 27,555
Lifetime Premium Member
Quote:
Originally Posted by NordRhein View Post
Have you replaced your valve cover gaskets? If not - do it.
+ 1. That should be the first step. The 'Welcome...' announcement / tutorial on top will help to locate the many threads in the forum archive etc.
Cheers
Teutone is offline   Reply With Quote
Old 11-01-2010, 06:24 PM   #4 (permalink)
BenzWorld Elite
 
ElRojo's Avatar
 
Date registered: Jul 2005
Vehicle: 1990 560 SEL
Location: Los Angeles
Posts: 1,838
Yup-- I was going to say "valve cover gaskets" too. They often leak at the rear of the cylinder bank, and a cursory inspection would make it seem like the rear seal. I'd definitely have a real close look at the top of the engine right in front of the false firewall. Also have a look at the oil pressure sending unit, below and behind the oil filter housing. Mine had a slow drip there for a long time, with the same smoke/smell symptoms. Very slow leak (oil level never went down more than 1/4 quart over 3K miles). Yours is more serious, obviously, and the VCGs are the prime suspect(s).
__________________
1990 560 SEL, 175K. Smoke silver (702) on Parchment leather (265). Gen 2 euro bumpers, euro headlights/turns, W140 glass moonroof, orthopedic seats, pushbutton FGS, blacked out grille, Nakamichi CD400/MBQuart 4.125 ONYX amp w/ Polk db650 rears, db1000 fronts, rear "dummy" lights activated as brake lights, 35% bronze tints.
1983 300SD, 106K. Orient Red (501) on Java MB tex (154). SOLD (and I miss ol' Hans...)
ElRojo is offline   Reply With Quote
Old 11-02-2010, 07:27 AM   #5 (permalink)
BenzWorld Junior Member
 
Date registered: Oct 2010
Vehicle: '90 560 SEL RUF 42,000m, '90 560 SEL RUF 56,000m, '90 560 SEL RUF 150,000m '90 560 SEC RUF 225,000m
Posts: 12
Quote:
Originally Posted by ElRojo View Post
Yup-- I was going to say "valve cover gaskets" too. They often leak at the rear of the cylinder bank, and a cursory inspection would make it seem like the rear seal. I'd definitely have a real close look at the top of the engine right in front of the false firewall. Also have a look at the oil pressure sending unit, below and behind the oil filter housing. Mine had a slow drip there for a long time, with the same smoke/smell symptoms. Very slow leak (oil level never went down more than 1/4 quart over 3K miles). Yours is more serious, obviously, and the VCGs are the prime suspect(s).
Chipping in my two cents; every time I've had smoke from under the hood, it's the Valve Cover Gaskets weeping gently onto the exhaust headers. I've had a 380 and two 560's do this, all around 130,000 miles (just before they start crying for valve guide seals to be replaced). The 380 was exactly as you describe; underside smeared in oil and drips from bell-housing. All from VGG's.
woodruf is offline   Reply With Quote
Old 11-02-2010, 11:38 AM   #6 (permalink)
BenzWorld Newbie
 
Date registered: Jul 2009
Vehicle: 1988 Mercedes Benz 560 SEL
Location: Champaign, IL
Posts: 4
Hmm... not the first time I've been suggested that the problem lies with the VCGs, but I never thought of taking a closer look at it. I will certainly look into it now, thanks for the pointers.
Blue Steel is offline   Reply With Quote
Old 11-02-2010, 01:44 PM   #7 (permalink)
BenzWorld Elite
 
joeSEC's Avatar
 
Date registered: Jan 2008
Vehicle: 1983 500 SEC Lorinser 1971 280se w108
Location: nz
Posts: 1,903
Also when the valve covers are off its a great time to check your cam chain and guides
I bought new valve cover gaskets and when I pulled the covers to fit em discovered my cam chain had streached my guides were brittle and saved myself major heart ache by doing the lot at the same time
__________________
joeSEC is offline   Reply With Quote
Old 11-02-2010, 07:01 PM   #8 (permalink)
BenzWorld Newbie
 
Date registered: Nov 2010
Posts: 2
I have the exact same car, what all is involved with changing the front seal on the transmission?
Tony Funches likes this.
Rocket9k is offline   Reply With Quote
Reply

  Mercedes-Benz Forum > Mercedes-Benz Sedan Forums > W126 S,SE,SEC,SEL,SD,SDL Class

Bookmarks



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Topic Author Forum Replies Last Post
Oil filter housing seal and Oil cooler seals DIY DETANE W163 M-Class 75 03-26-2014 03:51 PM
Help! Major oil leak m104 after valve cover seal replacement. dirtyhands W124 E,CE,D,TD Class 3 09-18-2010 11:31 AM
OIL LEAK- Oil Pump GAsket Seal ???. Guess Hew W203 C-Class 11 04-19-2010 05:37 PM
Oil leak (Rear Main Seal or Oil cooler)???? Tspeerjr W220 S-Class 2 07-01-2009 07:26 PM
Follow up: OIL LEAK- Oil Pump GAsket Seal ???.Radiator Reservoir Issue Guess Hew W203 C-Class 0 04-10-2008 07:45 AM


All times are GMT -7. The time now is 02:44 AM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.1

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.