Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 05-26-2001, 02:15 AM
Registered User
 
Join Date: May 2001
Location: Florida
Posts: 1,105
worried about my diesel (300SD)

Well i am the proud owner of a 1983 300SD. The engine starts great, seems to run great, but has a couple catches that have me worried. The first thing is that the engine runs at about 102 degrees C when idling, and around 95 when driving(with a/c on). This is after flushing the radiator, i'm thinking of just replacing the thermostat? Second, it has an oil leak that seems to come from EVERYWHERE. I looked at the bottom of the engine and it looks as if everything is leaking. The guy i bought the car from recently had the oil lines replaced as well as the oil pan gasket, so valve covers maybe? I'm worried because i heard that these engines can leak from the block or something? is that true? also, there is a little bit of oil in my air filter housing. Is that normal? The oil leak has also gotten much worse within a couple days time, although it does seem to lessen and get worse intermitantly. If you have any tips or advice on ANY of these things, please let me know. By the way the car has 150k miles on it and seems to run/shift/idle great. Thanks again
R

Reply With Quote
  #2  
Old 05-26-2001, 04:16 AM
Johnson Chan
Guest
 
Posts: n/a
clean the engine first so you can pinpoint the area of the leak.
Reply With Quote
  #3  
Old 05-26-2001, 09:29 AM
Registered User
 
Join Date: Aug 2000
Posts: 269
A good bath will help narrow things down. Oil in the air filter is normal on these fine cars and there is a separator and a drain that returns it to the pan. There is a revised flat baffled breather hose that goes from the valve cover to the air filter that cuts down on drips. The other common sources are the valve cover gasket, the turbo drain line seals the air filter drain line o-ring at the pan. the oil filter housing to block gasket. the IP to block gasket, and the front crank seal. Start at the top and work your way down.

Bob D.
Reply With Quote
  #4  
Old 05-26-2001, 12:04 PM
Registered User
 
Join Date: May 2001
Location: Florida
Posts: 1,105
What/how to you recommend cleaning it? I took it once to that car wash thing and it didn't do much. I don't' want to get water where it's not supposed to be. Also, if it is in fact leaking from the front crank casing is that something even worth fixing, or will it just leak oil forever? I know my valve covers are leaking but I didn't think that they could put down about a 2 inch diameter circle of oil every night, plus I don't see that much "liquid" oil around them, just all over the bottom of the engine. I do see oil stains that seem to go up onto the valve covers, it goes up about 1 inch from the gaskets and then is clean the rest of the way. The only leak that you mentioned there that concerns me is the crank casing because I'm not sure that I could reasonably have that fixed. Thanks for your help
R
Reply With Quote
  #5  
Old 05-26-2001, 12:40 PM
Registered User
 
Join Date: Jan 2001
Location: Tucson, Arizona
Posts: 758
Use a Degreaser

Greetings,

To get a better look at the engine and where the leaks are coming from I'd spray it down with a degreaser let it sit 10 minutes or more and pressure wash the crud, sludge and oil that has built up on the engine. If you are to wild with the pressure washer wand you may want to cover electrical relay boxes etc. under the hood to keep water out. Just one of the uses of used plastic shopping bags, handles tie easily into a knot to keep pressure from blowing them off. Some of the most common leaks will probably be found at the valve cover gasket, (easy fix and cheap to buy from Fastlane) front or rear oil pan to engine seals, (requires lifting engine up with hoist to remove upper pan assembly) lower oil pan seal, once again an easy fix. There are other areas that may seap oil that in most cases can either be tightened or seals replaced. Also look at the oil filter housing to engine connection for possible seal leakage, as well as oil lines that are connected to it and running to the IP. Time and a few hours spent can cure most of your major oil leaks.

Charles
Reply With Quote
  #6  
Old 05-27-2001, 05:38 PM
Registered User
 
Join Date: Jan 2001
Location: Santa Clara, CA
Posts: 448
To clean my engine, I use Gunk foamy, but the critical thing is to NOT do it when the engine is hot. Warm is good, but absolutely not hot. It isn't the Gunk that is bad, it is the cold water you wash it off with. Avoid temperature shock at all costs.
__________________
'76 240D-Sold
'78 240D-Sold
'85 300 SD, 165K-Sold
'88 300 TE, 165K-Sold
'64 Porsche 356C Cabriolet- under restoration
'86 560SL 124K Miles-Sold
'94 320E Wagon, 74K Miles-128K Miles JUNKED
'06 E350 Wagon, 84K Miles
07 SL550, 14K Miles
Reply With Quote
  #7  
Old 05-28-2001, 10:46 AM
NIC
Guest
 
Posts: n/a
I believe someone mentioned this but check the oil return line under the air cleaner housing. Oil accumulates in the cyclonic thingamabob inside the air cleaner housing and is returned to the engine via a tube under the housing. there is a critical "o" ring there that can be bought for about a dollar. The only leak I had was that one and it got the whole area underneath it oily.

Good luck.

Nic in SC
'85 300CD @ 140k miles
Reply With Quote
  #8  
Old 05-28-2001, 01:14 PM
MikeTangas's Avatar
Senior Member
 
Join Date: Apr 2000
Location: So. Cal
Posts: 4,430
Cold clean for diesels...

or so I've heard. Because of the high heat generated by the vacuum pump, it is best to clean the diesel engine when cold to avoid damaging the pump.

Definitely change the valve cover gasket (you only have one), you'd be amazed at the amount the cover(s) can leak. The valve cover bolts only need something like 8 ft lbs to tighten, so be careful not to over tighten them.

Depending on how much crud has built up on the sides of the block, it may take several degreasing sessions to really knock the crud down.
__________________
Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon TDI...at least its a diesel

Non illegitemae carborundum.
Reply With Quote
  #9  
Old 05-28-2001, 01:17 PM
Robert W. Roe's Avatar
Registered User
 
Join Date: May 1999
Location: Lehigh Valley PA
Posts: 1,330
I once "washed" my '77 300D's engine with a can of WD40 and a bunch of paper towels. It was a can that had fallen onto it's nozzle and the nozzle was broken off. I used a can opener to make a tiny opening in the top of the can and let the WD40 drip onto the caked oil all over the engine. It worked pretty well, but I think I still had some oil left after the 16 oz of WD40 was all gone Just a suggestion; it did seem like a more controlled method than a car wash or a garden hose.

My current engine has yet to see water, but it doesn't use much oil, so it can't be leaking, right? I've been really tempted to take the SD to Florida when we go to visit the in-laws next, since they have a brand-new concrete driveway, so I can see if my car leaks. My current parking spot has been occupied by three MB diesels in recent years, so it's hard to tell if it's ATF, power steering fluid, oil, or diesel fuel marking up the asphalt.
__________________
Bob Roe
Lehigh Valley PA USA
1973 Olds 88, 1972 MB 280SE, 1978 Datsun 280Z, 1971 Ford T-Bird, 1972 Olds 88, 1983 Nissan Sentra, 1985 Sentra, 1973 230.6, 1990 Acura Integra, 1991 Volvo 940GLE wagon, 1983 300SD, 1984 300SD, 1995 Subaru Legacy L wagon, 2002 Mountaineer, 1991 300TE wagon, 2008 Murano, 2007 R320CDI 4Matic 52K, some Hyundai, 2008 BMW 535xi wagon, all gone... currently
2007 Honda Odyssey Touring, 2014 E350 4matic
Reply With Quote
  #10  
Old 05-28-2001, 02:37 PM
engatwork's Avatar
busy
 
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 12,418
don't forget to clean

and lube the throttle linkage connectors after the pressure wash. That pressure wash seems to clean all that out real good too.
I just finished cleaning the 300D and I will get out there and do the lube thing on the throttle linkage sometime this afternoon.
Jim
'85 300D
'95 E320
'97 CRV

Reply With Quote
  #11  
Old 05-28-2001, 09:37 PM
WoodTA
Guest
 
Posts: n/a
300SD Leak Too

I have also recently purchased a 82 300SD. I consider myself a basic fix it person. I have noticed my driveway is bearing the same mark of the diesel. I have pinpointed my leaks though. One leak was coming from the rubber boot(top of oil pan) where the turbo exhaust tube goes down into the oil pan. I was able to go under the car and lift the tube, twist the boot slightly and then move the tube back down. This seemed to solve this leak. The leak I am fighting now is under the oil filter where the hoses attach to the filter housing (bottom hose). Because of the location, I am having a hard time getting a wrench on this tube to tighten it. The only other problem I have had thus far was diesel leaking from the last fuel line on the injectors. I replaced this and it solved the leak. Good luck with your ventures. I am having a blast working with mine.
Reply With Quote
  #12  
Old 01-29-2005, 01:24 AM
whunter's Avatar
Moderator
 
Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,357
Talking Bump

Old is not bad.
__________________
ASE Master Mechanic
asemastermechanic@juno.com

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Prototype Vehicle build.
Prototype Fleet Durability
Prototype vehicle instrumentation.
Technical Quality Auditor.
Automotive Technical Writer

1973 300D
1973 309D - stolen
1978 280SE
1980 240D
1983 300D
1984 190D
Reply With Quote
  #13  
Old 02-04-2005, 11:33 PM
Robert W. Roe's Avatar
Registered User
 
Join Date: May 1999
Location: Lehigh Valley PA
Posts: 1,330
Yup.
My SD turns 21 this month.
And the TE is leaking more than the SD; go figure.

__________________
Bob Roe
Lehigh Valley PA USA
1973 Olds 88, 1972 MB 280SE, 1978 Datsun 280Z, 1971 Ford T-Bird, 1972 Olds 88, 1983 Nissan Sentra, 1985 Sentra, 1973 230.6, 1990 Acura Integra, 1991 Volvo 940GLE wagon, 1983 300SD, 1984 300SD, 1995 Subaru Legacy L wagon, 2002 Mountaineer, 1991 300TE wagon, 2008 Murano, 2007 R320CDI 4Matic 52K, some Hyundai, 2008 BMW 535xi wagon, all gone... currently
2007 Honda Odyssey Touring, 2014 E350 4matic
Reply With Quote
Reply

Bookmarks

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Geely Metop - Are the Chinese Worried? MapleOne Off-Topic Discussion 3 03-12-2006 10:48 AM
Are we really worried about engines wearing out? blackmercedes Off-Topic Discussion 8 05-26-2003 05:29 PM
Canadians are worried... BENZ-LGB Off-Topic Discussion 12 03-24-2003 06:11 PM
Uh oh...rust on 240D got me worried!!! ktang Bodywork - Repair, Paint, Tools, Tips & Tricks 1 01-20-2003 09:21 PM
Worried about MB CaptAlex300e Mercedes-Benz Performance Paddock 45 12-24-2000 12:16 AM



All times are GMT -4. The time now is 05:08 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page