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Chain Tensioners and Camshaft Adjusters-Rattling noise on startup
Hi all, I have the popular rattling/knocking sound for the first 5 seconds and then dissapears on my m278. The sound is coming from the left side so I decided to open it up. I found that the chain tensioner on that side is bad and I will have to replace it however I noticed that I don't have check valves installed so I have to ask the dealer if I have to install them. Not totaly sure if my sound is coming from the bad chain tensioner or from a bad camshaft adjuster. Some people have a faulty camshaft adjuster that was causing their noise and after replacing it resolved the issue. I'm not sure if I will replace the adjusters because I'm not sure if they're bad and those are a little challening for me because you have to take the whole top off and injectors etc. and make sure I don't mess-up the timing. Does anyone here know how to check the camshaft adjusters to see if they're bad without taking them out and also if anyone can provide a workshop manual on how to replace the adjusters and tensioners? Notice there's no check valve installed.
Thank you all.
Last edited by BlackCLS550; Jun 21, 2022 at 11:31 PM.
Reason: typo
I had the adjusters replaced on my 2012 with 100k miles. they are not cheap but i was able to source them oem and cheaper than my dealer. my indy mechanic did labor for one bank for around 1800 including a new tensioner. i did check valves plus tensioners myself and the noise continued. i believe you might be able to use xentry to see if the adjusters are faulty. when i had the timing cover off like your photo, i spun the engine by hand and oil would squirt out of the bad adjuster i had, i would try to spin it with the chain tensioner in place. good luck
Hi all, I have the popular rattling/knocking sound for the first 5 seconds and then dissapears on my m278. The sound is coming from the left side so I decided to open it up. I found that the chain tensioner on that side is bad and I will have to replace it however I noticed that I don't have check valves installed so I have to ask the dealer if I have to install them. Not totaly sure if my sound is coming from the bad chain tensioner or from a bad camshaft adjuster. Some people have a faulty camshaft adjuster that was causing their noise and after replacing it resolved the issue. I'm not sure if I will replace the adjusters because I'm not sure if they're bad and those are a little challening for me because you have to take the whole top off and injectors etc. and make sure I don't mess-up the timing. Does anyone here know how to check the camshaft adjusters to see if they're bad without taking them out and also if anyone can provide a workshop manual on how to replace the adjusters and tensioners? Notice there's no check valve installed.
Thank you all.
Hello, I have rattle after the atrat up in my 2014 GL450 with 136k miles and I am thinking if this is due to tentioner not holdig up anymore. If you did replace them, was the older one extending to full length? Did replacing those solve anything for you? Or it ended up something else.
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Chain Tensioners and Camshaft Adjusters-Rattling noise on startup
