M271 Cam Chain Tensioner (2013 C250)

Aug 18, 2022 | 07:04 PM

jpeter6981

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2014 SL550, 2014 GL350, 2002 CLK430 Cabriolet

M271 Cam Chain Tensioner (2013 C250)

Hello.
Has as anyone changed out the chain tensioner on the M271? Looking at the WIS, it calls for a number of extra steps including locking one camshaft? I've changed at least 10 tensioners on M112, M113, M104, etc. engines, but never have I had to do anything that involved. Any insights?

Thank you.

Aug 19, 2022 | 12:44 PM

alynch

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Joined: Jun 2016

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From: Panama City, FL

2020 C300, 2013 C250, 2000 Boxster S

Quote:

Originally Posted by jpeter6981

You have to rotate the engine counter to the normal rotation to release the tensioner piston. As the chain is still "slack" prior to the piston extending, it's possible the chain can skip unless the intake camshaft is held in position. You just have to remove the intake camshaft solenoid and use the special T100 Torx socket to hold the camshaft while counter-rotating the crankshaft to release the tensioner piston.

Last edited by alynch; Aug 19, 2022 at 03:30 PM.

Aug 19, 2022 | 04:46 PM

jpeter6981

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2014 SL550, 2014 GL350, 2002 CLK430 Cabriolet

Thank you for the response. That make sense. Jeff

Aug 21, 2022 | 01:23 PM

jpeter6981

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Junior Member

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2014 SL550, 2014 GL350, 2002 CLK430 Cabriolet

Getting prepared to do the replacement. Just wanted to confirm that, as far as the intake camshaft is concerned, is that it just be held firmly in place while counter rotating the crankshaft? (I have the MB T100 Torx).

Thanks again. Jeff

Aug 21, 2022 | 01:49 PM

alynch

Senior Member

Joined: Jun 2016

Posts: 462

Likes: 152

From: Panama City, FL

2020 C300, 2013 C250, 2000 Boxster S

Quote:

Originally Posted by jpeter6981

Yes, just hold the camshaft with the MB T100 Torx and slowly counter-rotate the crankshaft. You'll hear a click which is the piston releasing then, when you release the pressure on the crankshaft, you will hear the ratcheting of the extending piston.