Parts Catalog Accessories Catalog Tech Info Tech Forums
  Search our site:    
 Cart  | Project List | Order Status | Help    

Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 01-25-2003, 03:33 PM
Registered User
Join Date: Jan 2002
Location: England
Posts: 1,841
Yummy spark plugs (not)

Hey guys

Pulled my plugs the other day.. check the pic. Apparently that's from all the oil I'm burning. What's the most likely fix - valve stem seals? It's on my M102 4 cylinder 2.0

I pulled them again today, and one of them was heavily caked with a sort of crusty white powder, again apparently that's from oil.

I replaced them with some NGKs.


Attached Thumbnails
Yummy spark plugs (not)-plugs2.jpg  
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
Reply With Quote
Old 01-25-2003, 03:51 PM
sunil190e-1.8's Avatar
Registered User
Join Date: Jun 2002
Location: uk
Posts: 236
sounds very much like the valve stem guides or piston rings-have you done a compression test?

what sort of mileage has the car covered?

mine has coveres 122k-the last time i looked at he plugs-they were fine.
Reply With Quote
Old 01-25-2003, 03:59 PM
Registered User
Join Date: Jan 2002
Location: England
Posts: 1,841
see my sig - well it's now 75,000 miles.

My dad has maintained the car since pretty much when new (for the previous owner), and apparently has done the valve stem seals once already.
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
Reply With Quote
Old 01-25-2003, 04:49 PM
Registered User
Join Date: Dec 2001
Posts: 565
I would imagine you're referencing the '86 model car you own - 17 yrs. old now. Mileage is not always an issue. You could have a bad stem seal in that cyl. as well as a faulty guide or oil ring(piston).

I'd recommend professional analysis. A compression test was suggested - a leak-down test could also prove useful.

If the oil has been changed semi-regularly, I'd bet on the problem being in the head, but again, these things are difficult to analyze over the WEB. Go see a pro if you do not posess the knowledge and have the equipment to analyze.

My 2 cents.
Reply With Quote
Old 01-25-2003, 06:44 PM
Registered User
Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
That is definitely oil fouling.

The valve guide seals are the cheapest alternative, so go ahead and do them, they die from old age. Chances are they are rock hard and useless at the current moment.

If that doesn't fix the oil consumption, you will need to look elsewhere -- you can check the valve to guide fit while changing the seals, probably -- no perceptible motion sideways. If you can rock the valve stem back and forth sideways and feel it, the guides are worn.

Synthetic oil leaves considerably less residue, by the way, another reason to change over. And you do need to get the oil problem fixed, the ash is abrasive.....

1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
Reply With Quote
Old 01-25-2003, 10:34 PM
it leaks, its german
Join Date: Mar 2002
Location: raleigh nc
Posts: 1,111
102's have the same lovely valve geometry as the 103's.

I'd do the guides but, a set of seals should get it going for awhile.

Shell rotella seems to do really well in these engines for both comsumption and coking.

If you opt to do seals, check the rocker boxes to be sure they will hold torque before pulling them. I've seen many a 103 rocker box bolt that was stripped in a previous repair attempt.

Project Smoker, '87 603 powered wagon
Hauler, 96 CTD can you say torque?
Toy 73 Cougar xr7 convertible
Acme Automotive Inc.
Raleigh NC
Reply With Quote


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

All times are GMT -4. The time now is 02:47 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page