Known m276 rattle..
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Member
Joined: Aug 2015
Posts: 126
Likes: 7
From: Boston MA
C320 sport 2003, c300 4matic sport 2013, 2018 GLE63 AMG
Known m276 rattle..
Hello guys, hope everyone is staying healthy!
2013 c300 4matic.
So it's been over three months now since I have a rattle noise inside my m276 (90K miles) engine on a cold start or 5 min of sitting and now it finally gave me a check engine light (P0346). I did know about this common issue in 2012-2015 3.5l engines, and was planning a diy on changing the chain tensioners and installing oil drain valves when it gets warmer but I didn't know the problem will go on to camshaft adjuster.
Chain tensioner and oil drain valves on FCP are 450$ set, plus 900$ camshaft adjuster... I could change tensioner and install the valves my self but the camshaft adjuster is too tricky and requires a different set of tools. Called different shops in MA they are all 2000$+ to fix this issue. Now Im thinking of just swapping my engine which sounds crazy to me but it only costs around 2000$. Since I did research on this topic, believe me, swapping engine sounds easier than changing camshafts lol.
The trick Im using right now to stop the morning rattle is to add a little bit of oil before I start the car. I guess it lubricates the camshaft adjuster and tensioners and rattle becomes less of embarrassing.
Anyways, if anyone faced this problem, I would greatly appreciate your advice. And for the owners of m276 2012-2015 year, if you hear rattle on cold starts, change your tensioners and add oil valves right away to save more money in the future. Thank you.
btw selling 18" oem w204 c63 amg rims slide in messages;
2013 c300 4matic.
So it's been over three months now since I have a rattle noise inside my m276 (90K miles) engine on a cold start or 5 min of sitting and now it finally gave me a check engine light (P0346). I did know about this common issue in 2012-2015 3.5l engines, and was planning a diy on changing the chain tensioners and installing oil drain valves when it gets warmer but I didn't know the problem will go on to camshaft adjuster.
Chain tensioner and oil drain valves on FCP are 450$ set, plus 900$ camshaft adjuster... I could change tensioner and install the valves my self but the camshaft adjuster is too tricky and requires a different set of tools. Called different shops in MA they are all 2000$+ to fix this issue. Now Im thinking of just swapping my engine which sounds crazy to me but it only costs around 2000$. Since I did research on this topic, believe me, swapping engine sounds easier than changing camshafts lol.
The trick Im using right now to stop the morning rattle is to add a little bit of oil before I start the car. I guess it lubricates the camshaft adjuster and tensioners and rattle becomes less of embarrassing.
Anyways, if anyone faced this problem, I would greatly appreciate your advice. And for the owners of m276 2012-2015 year, if you hear rattle on cold starts, change your tensioners and add oil valves right away to save more money in the future. Thank you.
btw selling 18" oem w204 c63 amg rims slide in messages;
Last edited by arkim989; Apr 29, 2020 at 10:27 PM.
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Joined: Oct 2004
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From: Las Vegas, Nevada
2013 C350 Coupe, 2005 C230K Kleemann Sedan, 2013 GLK350 4matic
I believe there is a Service Bulletin out for this issue. Check with your dealer., as it applies to specific engine serial numbers.
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2012 C300 4MATIC Sport
Thread Starter
Member
Joined: Aug 2015
Posts: 126
Likes: 7
From: Boston MA
C320 sport 2003, c300 4matic sport 2013, 2018 GLE63 AMG
