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Old 02-18-2001, 10:24 AM
engatwork's Avatar
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 11,234
question. I have just purchased a 1985 300D - turbo and the first item on the work list is to get the brakes in good operating condition. My question has to do with the timing chain. I am planning on replacing the chain but was wondering if I should replace the guides too. Also, doesn't this one have a chain for the oil pump? Can these chains/guides be replaced without removing the engine from the car?
'95 E320
'97 Honda CRV
'85 300D - turbo
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Old 02-18-2001, 10:40 AM
Dr Parts
Posts: n/a
Yes, I always sell the guides as you call them(we call them the rails) with the chain job, Also yes there is a oil pump chain. No I dont think the engine has to come out to do the job. If you plan on doing the job yourself check out the new Fast lane catalog, it has all of the above parts at better prices than they do at the dealer.
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Old 02-18-2001, 10:46 AM
Registered User
Join Date: Jan 2001
Posts: 39
How many miles?

How many miles are on your timing chain? I made an appointment with my neighbors dealership to replace my chain and he told me not to waste my money. According to him diesel timing chains are very reliable and go at least 250k miles without worry. My car only has 165k miles. I trust my neighbor - he sells and services many older Benz's and his wife drives a 300TD. On the other hand I understand the dire implications of the chain letting loose.

Changing the chain is not too difficult. After removing the cover, the old chain is broken using a chain tool (a big version of a bike chain tool). The first link of the new chain is then temporarily linked to the last link of the old chain. The old chain is pulled out keeping tension on the whole thing or it skips out of the tensioners. Next the temporary link is removed along with the old chain and the new chain is linked together. Then the fuel injection timing needs to be checked/adjusted. This requires a unique tool that someone else can explain. Don't remove the engine!

Larry is right, measure to see if the chain needs replacement.

[Edited by jsrmb on 02-19-2001 at 10:22 AM]

1983 300D Turbo
1995 E320 Wagon
2001 MR2 Spyder
2001 Subura WRX Sedan
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Old 02-18-2001, 11:10 AM
Posts: n/a
Mileage is not the only factor in the life expectancy of a timing chain. If the engine has not had frequent and religiously thorough oil changes, the microscopic particulate matter will have stretched a timing chain before it's time.

The only way to know for sure, is to use a dial indicator and the procedure and specs in the MB manual.

Good luck,
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