68 w108 camshaft issues - Mercedes-Benz Forum

 
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post #1 of 3 (permalink) Old 10-05-2013, 08:15 PM Thread Starter
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Vehicle: 1968 mercedes 280s
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68 w108 camshaft issues

I'm working on a 1968 280s with a bad cam journal. I checked with the Classic Center and was told PN# 1800510835 was the only one that would work. I was told by a company in Germany that since my car had a smog pump the head was configured differently with smog pump inlets and so required this cam. Is this true? Do all sixes with smog pumps use this cam or are there other PN#s that work?
Jeff
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post #2 of 3 (permalink) Old 10-06-2013, 06:38 AM
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Any straight 6 cam will do, as nobody cares one wit about smog performance on a 68. If you go used, you the journals, cam shaft and rockers that have been marked during removal so they go back under the same spots.

Note that there are different height journals and different diameter camshafts, so you will have to keep them properly matched. For instance, the 1968 model 280se has a journal and cam shaft combination that is 1mm off from all later 280se motors.

Measure the space between the back of a cam lobe and the top of a valve stem with the removable spacer out of the way before you take it all apart. And measure again when its all back together. If you're a 1mm off, you'll need different spacers to compensate for the change.

(and yes, doing that measuring before you assemble it is good idea too).

As for assembly work, is the motor in the car? I means undoing about 1/3 of the head bolts to remove the journals.

-CTH
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post #3 of 3 (permalink) Old 10-06-2013, 07:13 PM Thread Starter
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Thanks CTH I was wondering if matching journals and cam was the answer. Are there preferable PN#s to look for?
thanks, Jeff
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