Timing Chain Replacement - MBWorld.org Forums

S-Class (W140) 1991-1999: 300 SD, S 350TD, 300 SE 2.8, S280, 300 SE 3.2, 300 SEL 3.2, S320, S320L, 400 SE, S420, 400 SEL, S420L, 500 SE, S500, 500 SEL, S500L, 600 SE, S600, 600 SEL, S600L, 500 SEC, 600 SEC

Timing Chain Replacement

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Old 01-31-2006, 06:46 PM   #1
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Exclamation Timing Chain Replacement

Is it prudent to replace the timing chain in a 1996 S320 at a certain mileage interval, e.g., 150,000 miles. Does maintenance of car make a difference? Thx!!

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Old 01-31-2006, 10:21 PM   #2
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It's definitely prudent. Whether it is necessary is a topic of much debate. I say why not do it sooner rather than later.

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Old 02-04-2006, 10:00 PM   #3
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Provided the oil was changed, the timing chain on an M104 should be good for a very very long time. When it rolled over 200k it may be worth instpecting for stretch and inspecting the guides. But I wouldn't expect to replace it until the 300k range.

The key to it is maintaince. MB specs out Mobil 1 0w-40, use a high quality synthetic oil and change it every 5k miles.

The 606 diesel which has a similer chain and cam set up to the M104 seems to create about 1 degree of chain stretch every 100k miles. Provided synthetic oil is used of course. I don't know what the stretch limits are on the M104 but I bet it is 3-5 degrees.

Purchase a FSM and read up on it.
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1997, 1999, 97, chain, diy, interval, m104, removal, replace, replacement, s320, s500, set, timing, w140

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