Timing chain replacement question - Mercedes-Benz Forum
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#1 (permalink) Old 08-30-2007, 06:30 PM
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Timing chain replacement question

I sometimes hear very faint rattle sound for about 1 second when i start the car up(after it has been sitting for while)
i suspect it could be the chain either slack or tensioner not keeping it tight due to no oil pressure or it could even be the lifters for all i know...

Well anyway to have a peace of mind i went to MB specialist to ask how much for chain/tesioner/plastic rails replacement and he gave me quote 900 NZD for parts and about 8 hours labour so that equals around 1400NZD (around 1000USD) is it worth doing for that price or should i just keep driving it...

Any opinions guys?
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#2 (permalink) Old 08-30-2007, 06:35 PM
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Hmmm, I don't think that the chain will snap as the W140 has the double row chain I guess the real area of concern would be the guides or that the chain can streach a bit.

I spoke to a guy a while ago re: timing chains who was not a benz mechanic he seemed to think that the chains did need adjusting every 100,000km's or so but I don't know how much I'd agree with that. Thing is replacing the guides requires removing of the chain so your right in doing the chain if you do the guides in any case.
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#3 (permalink) Old 08-30-2007, 09:06 PM
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well my MB mechanic said that chain virtualy never snaps but due to some stretch it can smash those plastic rails and those then fall down and allow chain to jump over bottom sprocket....and thats how you end up writting off your beloved W140
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#4 (permalink) Old 08-30-2007, 09:20 PM
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Originally Posted by miloking
well my MB mechanic said that chain virtualy never snaps but due to some stretch it can smash those plastic rails and those then fall down and allow chain to jump over bottom sprocket....and thats how you end up writting off your beloved W140
Can't they open up the front of the engine and see if all the timing marks line up and the condition of the guides that will give an idea of whats what?
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#5 (permalink) Old 08-30-2007, 10:37 PM
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yeh thats what i will do, i will get them to measure the chain and if its not within the spec then i will have to break the piggy bank :-(

- now its just a matter of trust, because they know they will do the job themselfs and they are supplying the parts so i will have to find out what ithe value actualy should be,
i do that sort of thing with my motorcycle chain but iam not quite sure how to measure the strech on M119 engine...

Last edited by miloking; 08-30-2007 at 10:40 PM.
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#6 (permalink) Old 08-31-2007, 06:24 AM
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Early 119 motors have a problem with oil leak down causing a lack of tensioner pressure on start up. The first thing to do is replace the oil check valve in the oil filter housing. There is a new design that is supposed to improve the situation. It is about a $20 U.S. part. At the age of your car it is a good idea to replace the upper chain guides. This requires removing the valve covers - not a huge job, not anywhere near the numbers you have been quoted.

Last edited by deanyel; 08-31-2007 at 06:27 AM.
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#7 (permalink) Old 09-03-2007, 04:59 PM
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Quote:
Originally Posted by deanyel
Early 119 motors have a problem with oil leak down causing a lack of tensioner pressure on start up. The first thing to do is replace the oil check valve in the oil filter housing. There is a new design that is supposed to improve the situation. It is about a $20 U.S. part. At the age of your car it is a good idea to replace the upper chain guides. This requires removing the valve covers - not a huge job, not anywhere near the numbers you have been quoted.
Thanks Deanyel for your answer could you please point me to this valve, here is a picture of oil filter housing and the parts, is that valve shown here?

first pic is oil filter housing, second is the routing and thrid is the oil pump...if anybody else knows about this valve that will reduce the pressure drop from chain tesioner let me know


Thanks
Attached Images
File Type: jpg oil filter.JPG (26.4 KB, 1213 views)
File Type: jpg Oil routing.JPG (25.4 KB, 669 views)
File Type: jpg oil pump.JPG (27.0 KB, 2328 views)

Last edited by miloking; 09-03-2007 at 05:16 PM.
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#8 (permalink) Old 09-03-2007, 05:37 PM
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#48 on the top picture, should be about $20. You must of course drain the oil, remove three allen head bolts for the oil filter housing and it's pretty much self explanatory from there as I recall.
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#9 (permalink) Old 09-03-2007, 06:45 PM
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ohh Very good thanks a lot, i dont think anybody else knows about this fix for "drop of pressure from tensioner"
BTW for anybody else interested part #48 comes as MB part# 1191840130
I will replace it and see how it goes....
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#10 (permalink) Old 09-03-2007, 07:28 PM
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Originally Posted by miloking
ohh Very good thanks a lot, i dont think anybody else knows about this fix for "drop of pressure from tensioner"
Here's a related thread - see especially posts #3 and #4.

How many hours of labor to replace engine bearingsin 500E? - ShopForum
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