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Old 06-08-2001, 06:38 PM
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I need help please. I have a 1985 500SEC (Euro), with 200K miles. Car has run flawlessly, but has developed an increasingly loud ticking noise from the passenger side (right) engine compartment. Visible thru the oil-fill hole on the valve cover, are grooves (not very deep) on the camshaft lobe. Local dealer said (from listening only) that it could be a rocker or lifter, but I'm wondering if I only replace rockers and lifters, without replacing the camshaft, is this a wise thing to do...or should I replace the camshaft also? Another mechanic said that the lines on the camshaft lobes are normal, but I would like to hear what the experts on this forum can offer. I plan to remove the valve covers and inspect the entire cam for wear, but by visual inspection, how do you tell if the the cam lobes are too worn? (forgot to mention that the oil tubes appear to be flowing well, so that concern is ruled out). Also the service foreman at the dealer mentioned that it only appears to be on the right side, but I will be pulling the valve covers on each side to inspect both cams, but the loud ticking sound is coming from the right side. PLEASE...WHAT SHOULD I DO?? (BTW, I will be replacing the timing-chain, top rails, tensioner and sprocket, during the repair.)
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Old 06-08-2001, 07:09 PM
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I know something about these camshafts,iīm from Sweden by the way,so my english probably stinks...
Check your camshafts visually,each lobe should not have any flat areas on the "edge" or sharp edges on the outerside,if they do the camshaft is worn...
A worn camshaft has a "harder" sound compared to a lifter..
If your cam i good,just replace the lifters and clean the oilpipe..
There is a trick to try with bad lifters...they can start knocking because of carbon or dirt inside them,but you can clean them IN the engine!,drain the motor oil and fill half motoroil and half atf-oil,let the engine get warm maybe 20min idle or so and change the oil again,this time only motor oil!
Sounds strange? it isnīt,the ATF-oil takes away carbon and stuff really well.
I have tryed this myself and it worked.
It will NOT work if the lifter is damaged,but they are not always damaged just clogged...
I have replaced the cams on one of my mercedeses too a v8 and it is really easy....
I hope this will be to your help!
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Old 06-11-2001, 02:11 PM
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Thanks for the tip. I did remove both valve covers this weekend, and the right side cam has one really worn lobe (the one mentioned eariler). I will have the local dealer replace soon. One other thing that I am concerned about is the possibility of thread damage during removal of the camshaft bolts. Is my concern warranted? I'm also wondering if I can count on my local MB dealer to inform me, if there is any damage done in the process. I've heard that if helicoiling is necessary, then that requires the complete removal of the head. Is this true? Is there any need for concern here? Should I question my dealer about this? One last thing please....I have one spark plug that is always "really oiled-up" upon replacement. It is on the same side as this camshaft, but not the same cylinder. Could this be valve seals, or valve stem seals, or something like that?, and should I have this done while having the camshaft replaced....or does this require complete removal of the head as well. "THANKS EVERYONE FOR THIS VERY VALUABLE INPUT".
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Old 06-11-2001, 05:43 PM
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smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 18,745
There is a special tool for M116/7 camshaft and cylinder head work. I doubt you'd damage threads using this tool.

An oily plug can mean a lot of different things, but probably means worn valve guides on a well used car with no other problems. The cylinder head has to come out to replace valve guides, and the camshaft, too, of course. And you might as well do both heads while you're at it.

91 300SE
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Old 06-11-2001, 06:36 PM
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It has also been suggested that a spark plug "non-fouler" could be a temporary fix for an oiled spark plug. Anyone familiar with such a thing? Saw one at AutoZone; it is screwed onto the threaded end of the spark plug, which is then screwed into the engine. It's supposed to keep the spark plug from getting oiled, thereby continuing to provide adequate spark?
Worth trying?
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Old 06-12-2001, 02:49 PM
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A very important thing about mercedes camshafts:Never fail to do your oilchanges!
The small tube above the cam has really small holes in it to spray the cam with oil,and little carbon or dirt in the pipe and your cam gets dry and worn pretty fast...
With most respect for the other answers you got,i dont think you should replace a good camshaft.I donīt know what a cam costs where you live but in Sweden where i live itīs rather expensive...Just make sure you use an oil of best quality and change it in time...
About the thing on the sparkplug...i think itīs better to fix the problem instead....
Maybe a compression test can tell you more about that cylinder.
Does it smoke when you start the engine or when you accelerate?
At start:valvesealings,at acc.:piston rings....
I dont think you should worry abot the cam bolts...the are not so very firm thightened.
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