Hi Alex great video Thank you. I have a 2012 E350 Bluetec with OM642 engine. On my car the tensioner is easily accessible once the passenger side air filter box is removed. The tensioner is easily accessible right above the Alternator. I pulled my tensioner out today and it is in the exactly same condition as yours.. it is fully extended and coming apart as you show in your video. When it come apart like that it is also extends more then a new tensioner so in my case I have to change the chain. A new tensioner would actually make things worse since it would not extend as much as my broken one... Sucks but need to install a new chain and tensioner to fix this. Cheers.
Before starting the engine disconnect plug from the Cam sensor located on the top of the right side of the head ( Passenger side) You crank the engine to build oil pressure without starting the engine only turning by the starter. Difficult to install the tensioner because is full of oil - press down and push out all oil. New tensioners improved one not have oil inside for that reason very easy to install. Never turn engine backword - in this job not need turn engine by hands
Actually, its a 10 minutes job. Without removing wheel etc. Just turn the engine manually with the wrench to loose the pressure from the chain guide. Then putting the new tensioner is very easy without any force. My old tensioner was damaged just like yours, but replacing it, only made things worst. I have to roll a new chain. Previous owner did too many kms with this rattling, and chain was too streched for a new tensioner.
I was Confuse because I have Mercedes r320 cdi saw him tensioner is different he is mechanic tensioner and he come Lucked ,,,,So when you install you have to unlocked But for this engine ml 350 bluttec tensuoner is Hydraulic Work on oil pressure .... I didn’t even know that And also nobody make a video And this guy Alex doesn’t explain this ... but still is nice video..... Thank you guys
@@noleksandr You have to turn the engine with installed tensioner of course. To release the pressure. Then remove it, and install it new one. This is the easiest way.
@@nico-toscani how do I know that I have released the pressure? What is the consequence if I have not removed the pressure? I would like to replace mine but I want to make sure I got all the procedures correct. thanks
Nico Toscani Can you help me I have the problem with the start with this car When is cold start good when is engine hot take 5,6 s to start? And also doesn’t have any lights on ... What I should be chec?
I removed old tensioner and installed the new one and tourq to 80nm as service procedure says. Then start the engine and its was worse rattle noise. Immediately shut off the engine and again removed the new tensioner. What I see it's not expanded like the old one it's too short . Is there a way to release this tensioner to right length
@@sampalle3393 sorry to hear that. Did the new tensioner extended after installation and first start up? How did you check if timing chain is stretched?
@@noleksandr it won't extend that's how it supposed to be. Found out with mb technician. So when we put a new one for stretch chain it won't pressurize the chain guide caus new one stops at stopper (4 noches that in the tensioner
I cheange tension and the chain is rattling non stop very loud, and I need to put back wold one to stop the noise, What is meaning this, propobaly is time to cheange the chain or anyy ather idea ??? Thanks
When i take out the new one it was the same lake how i instal, and the new one is slightly short then wold one. I thing new one need to be unlocked or no idea propobaly i don't do samthing right The engine it was working around 1min with new tensioner and chain still rattling like 1-2seconds after overnight, I instal wold one back and the chain was come back on normal sond Any idea please Many thanks
yeah im going to even prime it and i have the part now im doing it tonight i hope this fix the rattle noise in mine same 1 to 2 second and it goes away anyways ill give it a try later thanks to your video.
Have you hand turned the engine to release tension on chain tensioner and chain slider? How did you ensure that the chain did not loose tension and skip few teeth?
I didn’t turn engine to release tension. I removed right tire and splash shield and installed tensioner. You have to put some good pressure at the beginning . Turning engine could end up in skipping tooth and timing.
I went through 10 minutes of this gentlemens grief and said, forget about it, I took the tensioners thread and ran the very edge of the threads on the grinder about 1/8 inch in and just enough to basically make it a self tapping big bolt, in theory, I made a jig that hooked to the bottom piece on the chassis that allowed me to get leverage on the the tensioner, it comes compressed and should be a no brainer to install, but to get it to apply pressure, there is a process that could cause the chain to jump teeth, I DID NOT TAKE THAT RISK,l once I leveraged into into the threads, the ground down threads got it to start threading immediately with an open end wrench, I did it by myself, but if someone can leverage the part into the threads while you tighten the tensioner, its a ten minute job, no tires to remove or sensors to disconnect. and that's how I did it. good luck, without making the tensioners threads theoretically self tapping you will sweat bullets trying to get it to thread in straight without ruining the threads on the block.
Did you have chain rattle before replacing tensioner? Tensioner operates on oil pressure. Make sure there is no oil leak around tensioner and you have enough oil. After replacing I had chain rattle for 5-6seconds and then it went away.
@@noleksandr Because what you did - is a USELESS spend of time and money! The tensioner must be replaced only with a NEW chain. ua-cam.com/video/UAWSYENr2-c/v-deo.html&ab_channel=SPRINTERTECH
There is no set interval. If you change oil every 5-7k miles, chain should go for 300k+ miles. Few ppl mentioned that their chain is stretched at 100-150k miles and requires replacement.
I just changed my om642 timing chain tensioner, no need to remove the tire, literally took 10 mins or less to change out, seriously… the biggest problem was opening up my wallet to fork over $194 for it…
My engine sounds like shit. Done lots of work to it now I have noise from front end. I am thinking tensioner has failed. Everyone says new chain but I hope my tensioner not hold pressure. Thus no tension on chain.
Also this is following an oil and filter change, car had fsh until 2yrs ago. Piss service history since. Now I am paying for previous owner not looking after simple maintenance 🤬
Either tensioner was fkd? If not and fully extended, then either chain stretched, which can happen BUT Imo more so the guides wear down causing slap. I myself seem to gave slap and grim my research on om642. Tensioner then guides. Obv ensure flo. Fresh oil. I'm waiting on turbo Core and actuator. To fit rear coilovers so this is a job to add.
Hi Alex great video Thank you. I have a 2012 E350 Bluetec with OM642 engine. On my car the tensioner is easily accessible once the passenger side air filter box is removed. The tensioner is easily accessible right above the Alternator. I pulled my tensioner out today and it is in the exactly same condition as yours.. it is fully extended and coming apart as you show in your video. When it come apart like that it is also extends more then a new tensioner so in my case I have to change the chain. A new tensioner would actually make things worse since it would not extend as much as my broken one... Sucks but need to install a new chain and tensioner to fix this. Cheers.
Thanks for video.
I just did my .
But it's 5 minute job w/o pulling wheel off from top.
Just rotate crank on 40° before TDC
Thank you. I'd like to add, if you can't get it in, rotate the engine. Then rotate it back to TDC #1 if you are working on the head
After you replaced it doesn't have chirping in cold start? Thanks
Fantastic video coming from a bmw tech. My first Mercedes and this was what I suspected. Same issue.
Before starting the engine disconnect plug from the Cam sensor located on the top of the right side of the head ( Passenger side)
You crank the engine to build oil pressure without starting the engine only turning by the starter.
Difficult to install the tensioner because is full of oil - press down and push out all oil.
New tensioners improved one not have oil inside for that reason very easy to install.
Never turn engine backword - in this job not need turn engine by hands
I have a question when you installed tensioner .... did you unlock tensioner .... or you started the engine right away.....?
Need the answer
??
He Alex thanks for this choice video. Dose the crank have to be in TDC before it is turned anti clockwise? Thanks
The easiest would be to rotate the crank to 40 degrees before TDC.
After installing tensioner rotate clockwise
Actually, its a 10 minutes job. Without removing wheel etc. Just turn the engine manually with the wrench to loose the pressure from the chain guide. Then putting the new tensioner is very easy without any force. My old tensioner was damaged just like yours, but replacing it, only made things worst. I have to roll a new chain. Previous owner did too many kms with this rattling, and chain was too streched for a new tensioner.
Nico Toscani I was afraid for chain to skip the tooth, that is why I removed the wheel
I was Confuse because I have Mercedes r320 cdi saw him tensioner is different he is mechanic tensioner and he come Lucked ,,,,So when
you install you have to unlocked
But for this engine ml 350 bluttec tensuoner is Hydraulic Work on oil pressure .... I didn’t even know that
And also nobody make a video
And this guy Alex doesn’t explain this ... but still is nice video.....
Thank you guys
@@noleksandr You have to turn the engine with installed tensioner of course. To release the pressure. Then remove it, and install it new one. This is the easiest way.
@@nico-toscani how do I know that I have released the pressure? What is the consequence if I have not removed the pressure? I would like to replace mine but I want to make sure I got all the procedures correct. thanks
Nico Toscani
Can you help me I have the problem with the start with this car
When is cold start good when is engine hot take 5,6 s to start? And also doesn’t have any lights on ... What I should be chec?
I am replacing the chain but also the tensioner, good to know. Thanks, Ben
Changed the oil cooler gaskets during winter.
Timing chain tensioner is next maintenance job.
thanks, tensioner ordered :)
Great!
I removed old tensioner and installed the new one and tourq to 80nm as service procedure says. Then start the engine and its was worse rattle noise. Immediately shut off the engine and again removed the new tensioner. What I see it's not expanded like the old one it's too short . Is there a way to release this tensioner to right length
For the first 5-6sec you’ll hear rattle. Takes some time to build up pressure in the tensioner itself . Make sure oil lever is full.
@@noleksandr oil level is full and found out is a stretch timing chain.
@@sampalle3393 sorry to hear that. Did the new tensioner extended after installation and first start up? How did you check if timing chain is stretched?
@@noleksandr it won't extend that's how it supposed to be. Found out with mb technician. So when we put a new one for stretch chain it won't pressurize the chain guide caus new one stops at stopper (4 noches that in the tensioner
Hi
Need to put the engine on TDC pozition when you cheange the tension ?
Thanks
Not necessary
I cheange tension and the chain is rattling non stop very loud, and I need to put back wold one to stop the noise,
What is meaning this, propobaly is time to cheange the chain or anyy ather idea ???
Thanks
After removing new tensioner , is it extended fully?
When i take out the new one it was the same lake how
i instal, and the new one is slightly short then wold one.
I thing new one need to be unlocked or no idea propobaly i don't do samthing right
The engine it was working around 1min with new tensioner and chain still rattling like 1-2seconds after overnight, I instal wold one back and the chain was come back on normal sond
Any idea please
Many thanks
Tensioner i bay from mercedes dealer paid £108
How many times I need to turn the engine manually to release the chain pressure?
hi there did you have to soak the new tensioner on oil or you just installed it straight from the box?
Is better to soak in oil before installing
yeah im going to even prime it and i have the part now im doing it tonight i hope this fix the rattle noise in mine same 1 to 2 second and it goes away anyways ill give it a try later thanks to your video.
@@michaelbuenvenida8473did it solve your issue? And how many miles do have on yours?
@@Neosconcept no it didn't I actually had to replaced the whole engine as it leak oil from the tensioner hole
Have you hand turned the engine to release tension on chain tensioner and chain slider? How did you ensure that the chain did not loose tension and skip few teeth?
I didn’t turn engine to release tension.
I removed right tire and splash shield and installed tensioner. You have to put some good pressure at the beginning .
Turning engine could end up in skipping tooth and timing.
@@noleksandr did you set the engine to 40 Degrees TDC before replacing the tensioner or was that not necessary when doing it your way?
Cool video Alex
Thankyou 👍
I went through 10 minutes of this gentlemens grief and said, forget about it, I took the tensioners thread and ran the very edge of the threads on the grinder about 1/8 inch in and just enough to basically make it a self tapping big bolt, in theory, I made a jig that hooked to the bottom piece on the chassis that allowed me to get leverage on the the tensioner, it comes compressed and should be a no brainer to install, but to get it to apply pressure, there is a process that could cause the chain to jump teeth, I DID NOT TAKE THAT RISK,l once I leveraged into into the threads, the ground down threads got it to start threading immediately with an open end wrench, I did it by myself, but if someone can leverage the part into the threads while you tighten the tensioner, its a ten minute job, no tires to remove or sensors to disconnect. and that's how I did it. good luck, without making the tensioners threads theoretically self tapping you will sweat bullets trying to get it to thread in straight without ruining the threads on the block.
Then post a vid ffs..why talk about it..
Would have been a great video
Do you have to remove the entire engine to replace the timing chain
You don't have to
Could u tell me the tensioner part number..for mercedes..thanks
What should I do
Did you have chain rattle before replacing tensioner?
Tensioner operates on oil pressure. Make sure there is no oil leak around tensioner and you have enough oil.
After replacing I had chain rattle for 5-6seconds and then it went away.
@@noleksandr Because what you did - is a USELESS spend of time and money! The tensioner must be replaced only with a NEW chain. ua-cam.com/video/UAWSYENr2-c/v-deo.html&ab_channel=SPRINTERTECH
Hi..yea good video..i have a cls 2006 320..om642 engine..is tensioner the same..as yours...etc. thx
Yea mate..is the tensioner the same..as ml...and no turning of crank to ease pressure..etc..so straight fit..as u said..
With this engine, how many miles does the chain change?
There is no set interval. If you change oil every 5-7k miles, chain should go for 300k+ miles. Few ppl mentioned that their chain is stretched at 100-150k miles and requires replacement.
@@noleksandr The double chain or the single?
And with a 2.2 or 2.5 CDI biturbo engine, at what interval of miles does the chain change?
I just changed my om642 timing chain tensioner, no need to remove the tire, literally took 10 mins or less to change out, seriously… the biggest problem was opening up my wallet to fork over $194 for it…
My engine sounds like shit. Done lots of work to it now I have noise from front end. I am thinking tensioner has failed. Everyone says new chain but I hope my tensioner not hold pressure. Thus no tension on chain.
Also this is following an oil and filter change, car had fsh until 2yrs ago. Piss service history since. Now I am paying for previous owner not looking after simple maintenance 🤬
I just did the same job however, when I turned on now the car has the timing chain sound all the time
There Are Different chain Tensioner. The old om642 needs the INA chain Tensioner
Either tensioner was fkd? If not and fully extended, then either chain stretched, which can happen BUT Imo more so the guides wear down causing slap.
I myself seem to gave slap and grim my research on om642.
Tensioner then guides. Obv ensure flo. Fresh oil.
I'm waiting on turbo Core and actuator. To fit rear coilovers so this is a job to add.
Same here put the new one and it jumped timing. Is the a way to unlock new tensioner?? End up putting old one back and put a new tc and tct
Po
You talk to much
The video, Sir