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Member Poll
How many miles on your W124?

0mi - 50,000mi
0mi - 50,000mi
5% [87 Votes]

50,000mi - 100,000mi
50,000mi - 100,000mi
10% [178 Votes]

100,000mi - 150,000mi
100,000mi - 150,000mi
21% [376 Votes]

150,000mi - 200,000mi
150,000mi - 200,000mi
25% [438 Votes]

200,000mi - 250,000mi
200,000mi - 250,000mi
18% [323 Votes]

250,000mi - 300,000mi
250,000mi - 300,000mi
10% [177 Votes]

300,000mi - 350,000mi
300,000mi - 350,000mi
5% [85 Votes]

350,000mi +
350,000mi +
6% [114 Votes]

Votes: 1778
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Started: 03/14/2011

Polls Archive

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» W124-Zone.com » Technical Issues
 Print Thread
M104.981 Cold start knock/tap
ytech
Hey All,
About 2 months ago I changed the oil in my 1991 300SL-24 (99K miles). Since than I'm "chasing" a cold start tapping noise. The tap/knock will disappear after 3-5 second after the initial start up (while oil pressure builds up)
From a non brand 5w-30 full syn oil I switched to MB original motor oil (5w-40) which caused my engine too start tapping upon cold starts ( or after the car was left off for a few hours). Not even 15 miles on the new oil, I then changed the oil and filter (genuine mb filter) using delo 400 (15w-40) diesel oil which has plenty of zddp that are "good" for the hydraulic cam followers that are my suspects! ( I assume they never liked the new oil to begin with.) Another component that I suspect is the hydraulic timing chain tensioner, which I know is easy to replace (and I know that the installation must be done at steps) but with 99K miles my fear is that the chain will skip a tooth with the tensioner out.

I know that something is incapable of maintaining oil pressure and causing this knock!

I can't determine if it is a chain slap or a lifter tick..

Some videos..
The cold start tap

idling at 90 deg C

Thank you all.
 
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