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Old 01-25-2003, 04:33 PM
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Join Date: Jan 2002
Location: England
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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.



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2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
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Old 01-25-2003, 04:51 PM
sunil190e-1.8's Avatar
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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.
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Old 01-25-2003, 04:59 PM
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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
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Old 01-25-2003, 05:49 PM
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Join Date: Dec 2001
Posts: 572
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.
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Old 01-25-2003, 07:44 PM
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Location: Evansville, Indiana
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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!
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Old 01-25-2003, 11:34 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.


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