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Old 09-21-2000, 09:59 AM
Nick Jamal
Posts: n/a
Hi folks,
I've got an '86 300E (230km) that has developed, over the past few months, a distinct (read: loud) ticking noise from the front of the engine, it seems. It sounds somewhat metallic, increases with revs (in freq and volume), and is persistent. It also seems to cycle - eg., at idle, it gradually increases in volume for about 9 seconds, suddenly drops off, and then immediately starts up again. It is more pronounced during colder weather, but really will appear most anytime. Sometimes goes away, but it has recently been there about 90% of my driving hours. The car is well-maintained (fresh Mobil 1 regularly, etc.)
Any ideas?
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Old 09-21-2000, 10:05 AM
Oliverp's Avatar
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Join Date: Aug 2000
Location: Toronto, Canada
Posts: 451
I had an '87 300se, and this happend to me just before my water pump went.
I'm not technically minded, and i'm sure i'm probably wrong. You never know though.

I hope it isn't that bad, good luck.

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Old 09-21-2000, 10:52 AM
Chris Blanchard's Avatar
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Join Date: Dec 1999
Location: Cincinnati, OH
Posts: 221
I had a similar occurrence on my (now sold) 1991 300TE 4matic. I had a ticking noise, as you describe, from the front of the valve cover area. The car had an immaculate service history from the day it was new.

The noise was intermittent, one day it would tick, the next it wouldn't. One day it was ticking and I was near my mechanic, so he checked it out.

Turned out to be a failed/worn #2 lifter and a badly worn camshaft. #2 lobe was bad.
Some other top-end work was also done at that time.

Total cost to fix it all $1200. This car had its oil changed regularly, and while I owned it, it saw nothing but Mobil 1 10w30 at 5000 mile intervals.

Get thee to a good mechanic ASAP. I have my old camshaft sitting in the garage....

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Old 09-21-2000, 11:11 AM
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Join Date: Jan 2000
Location: Fl
Posts: 140
My 300E had the same simptoms, the hydraulic lifters were bad and had to be replaced.

If your are changing one, you might as well change them all, I think they run for $15 or $20 a piece, i don't remember. Anyhow labro might be expensive.

Good luck.

'86 300E
'87 300SDL
'92 190E 2.6
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Old 09-21-2000, 08:21 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
I have replaced many camshafts on these. There was a bulletin on the chilling process. I believe that they improved the hardness of the cam.

Donnie Drummonds
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Old 09-22-2000, 09:40 AM
Nick Jamal
Posts: n/a
Thanks for the responses (not for the specific answers, though... OUCH!)
Any estimations on what these two jobs might cost?
1)Replacing lifters
2)Replacing camshaft
Thanks again,
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Old 09-22-2000, 11:46 PM
Nick Jamal
Posts: n/a
Oh yes,
Is there an easy way to tell if it is the camshaft vs lifters? And what is/are the potential consequence(s) of driving it as it is for another few months?
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Old 09-24-2000, 06:10 PM
J.HIDALGO's Avatar
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Join Date: Jul 1999
Location: Jax, FL
Posts: 1,785
Did you check the little shock connected to the serpentine belt tensioner? Mine came loose and was making a metal to metal contact...easy and cheap to replace. Just trying to save you some money by keeping it basic.
Good luck!

'86 300E
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