Visual indication of timing chain stretch - Mercedes-Benz Forum

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post #1 of 129 (permalink) Old 04-04-2017, 12:54 PM Thread Starter
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Visual indication of timing chain stretch

Digging deeper into my timing issue, took off the cam cover and measured the chain stretch. What do you think, too much?
Pelican parts how to guide states "When the crankshaft is at TDC "0", the timing marks on the cam stands must never be early, however they should be right on or slightly late" which is true on this case but I don't know how "slightly" is slight enough
Cam is the passanger side bank. I painted the 0.0 mark with white paint
Thank you all
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post #2 of 129 (permalink) Old 04-04-2017, 01:43 PM
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If you have more than 7 degrees late on the crankshaft it is probably due (and will increase your engine performance after setting timing back to spec afterwards)
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post #3 of 129 (permalink) Old 04-04-2017, 01:43 PM
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There are degree markings on the ballancer, you should be able to read them when clean. From memory the timing should be adjusted if more than 8 degrees off and the offset could be different on the two cams. Usually the passenger cam is worst, and this can be corrected using two offset Woodruff keys available from the dealer.
My passenger cam was 10+ degrees off, and after changing chain, tensioner, sliders it was still 6 degrees off whilst the driver side was 0, used two 6.5 Woodruff keys. Noticed an improvement in low RPM torque.
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post #4 of 129 (permalink) Old 04-04-2017, 01:51 PM Thread Starter
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Thanks. Looks like stretch is 10deg and changing time is upon us
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post #5 of 129 (permalink) Old 04-05-2017, 01:32 PM
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There are degree markings on the ballancer, you should be able to read them when clean. From memory the timing should be adjusted if more than 8 degrees off and the offset could be different on the two cams. Usually the passenger cam is worst, and this can be corrected using two offset Woodruff keys available from the dealer.
My passenger cam was 10+ degrees off, and after changing chain, tensioner, sliders it was still 6 degrees off whilst the driver side was 0, used two 6.5 Woodruff keys. Noticed an improvement in low RPM torque.
Same thing when I change my chain, though I didn't have the offset keys to fix it. Figured it'd just broaden the torque band.
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post #6 of 129 (permalink) Old 04-05-2017, 02:11 PM
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Yes, it is not possible to know the offset ahead of time, so I just ordered the range. Had not realised I needed two for the RHS cam, so back to the dealer again. It is not obvious that Woodruff keys have been installed, so if you don't know the history of the car, verify this.
Have later learned that there is a replaceable black "washer" for the RHS bank that should be stamped with the new cam timing mark when using Woodruff keys.
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post #7 of 129 (permalink) Old 04-08-2017, 01:12 AM
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I've just got the rockers off on mine

( it's a grab it when I can kind of job, a few hours at a time) and both my cams are spot on at tdc. So the new sprockets should echo that when I install them, or am I in for a surprise?
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post #8 of 129 (permalink) Old 04-08-2017, 01:46 AM
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Probably a question of how much the old sprockets are worn, eventhough it is my impression that most of the wear is at "pull side" of the tips.
With your cam timing being spot on it would be unlikely that the sprockets were worn a lot.
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post #9 of 129 (permalink) Old 04-09-2017, 02:44 AM
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i've heard the 'death-rattle'

for a good long time on cold and warm start-up, and I have gone and bought all the bits in any event. the chain was last done 70000 miles ago, and i suspect the tensioner is the culprit, but as they say, I'm bollocks deep into this already, I might as well go most of the hog. ( not doing the lower guides, just the top set)
i am finding it therapeutic so far.
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post #10 of 129 (permalink) Old 04-09-2017, 04:55 AM
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I replaced the guides last December. Looking back it was actually a fun job other than forgetting to plug in the engine temp. sensor (the car would start and run but only barely).
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