Mercedes W204 CDI Rattle Sound On Cold Start up

[markt thomasson]

Hi all ,

Was looking for some advice / guidance regarding the engine sound i hear on cold start every now and again not always on every cold start and only happens on cold start never warm starts on my w204 c200 cdi c class , 2012 , I hear this rattle sound it varies the exact sound , however i have uploaded it i have had timing chain checked it is fine and oil fliter replaced last year along with air fliter and fuel fliter , my machanic thought it might have been the engine cover not put on right bu this now does not seem to be the case..

any comments welcome

 

[alexanderfoti]

That is the timing chain making that noise.

Check the tensioner hasnt failed.

How many miles on the engine?

How has the chain been checked?

Keep in mind, its relatively normal for them to make that noise, for a second or two if the car has been sitting for a while.

 

[markt thomasson]

That is the timing chain making that noise.

Check the tensioner hasnt failed.

How many miles on the engine?

How has the chain been checked?

Keep in mind, its relatively normal for them to make that noise, for a second or two if the car has been sitting for a while.

thanks for your reply i have had the timing chain checked it is fine , there is currently 114,000 miles on the clock

 

[alexanderfoti]

That is the timing chain making that noise.

How has the chain been checked?

 

[markt thomasson]

timing chain has been checked was advised its fine

 

[alexanderfoti]

Then I would not worry.

If it gets worse, or stays there at idle all the time, then Investigate further.

 

[markt thomasson]

Then I would not worry.

If it gets worse, or stays there at idle all the time, then Investigate further.

i taking it back tuesday to invisgate further however each time the machainc says does not hear it in person when car is there

 

[alexanderfoti]

i taking it back tuesday to invisgate further however each time the machainc says does not hear it in person when car is there

It's the chain making the noise, so they need to change the tensioner as a first step. Potentially checking the oil pressure on a cold start. Probably best to leave it with them overnight.

 

[markt thomasson]

It's the chain making the noise, so they need to change the tensioner as a first step. Potentially checking the oil pressure on a cold start. Probably best to leave it with them overnight.

i already sent car to them previously when i heard that sound they advised they checked the chain and have send the tensioner is ok and nothing wrong with it ,? i using same man for 15 years .

 

[alexanderfoti]

Not sure what you want me to tell you?

 

[markt thomasson]

Not sure what you want me to tell you?

well i guess the question is would someone pull the wool over my eyes after going there 15 years ?

 

[Gazwould]

Some unscrupulous mechanics are capable of anything !

 

[markt thomasson]

Some unscrupulous mechanics are capable of anything !

well i been using same guy 15 years normally on the button alot of people use him , did u listen to the sound

 

[Gazwould]

No but someone I was using ( mot tester / mechanic ) was passing his own failed shoddy work , wheel bearing and front ARB C Links , I already done a complete driveshaft that he redid as the new outer CV joint had ingress inside of 6 months , was never the same..

 

[markt thomasson]

No but someone I was using ( mot tester / mechanic ) was passing his own failed shoddy work , wheel bearing and front ARB C Links , I already done a complete driveshaft that he redid as the new outer CV joint had ingress inside of 6 months , was never the same..

listen to the sound and you tell me your view ?

 

[Gazwould]

Can't get the files to play .

Have you compared it to YouTube OM651 chain rattle vids ?

 

[markt thomasson]

Can't get the files to play .

Have you compared it to YouTube OM651 chain rattle vids ?

one of my files sounds simalar to it yes

 

[Dean Fletcher]

100% chain rattle on start up. I'd be going to see your mechanic again if I were you or better still get a second opinion. You don't want that baby going pop.

 

[Uncle Benz]

You say the mechanic has checked the timing chain, but I would ask him for some detail of exactly how he has checked it. The chain is at the rear of the engine. A rudimentary visual check requires all the injectors to be removed to allow the cam cover to be lifted. Not a five minute job. Mercedes have a tool to replace the tensioner which is basically a gauge that measures the wear. Getting to the tensioner though is also a bit of work. Ask the question.

 

[mersum1es]

chain/tensioner failure of OM651 is pretty common and all points that direction here