Timing chain tensioner - PeachParts Mercedes-Benz Forum

Zulfiqar · #1 04-22-2011, 10:49 PM

The timing chain tensioner on my cars engine 606 is leaking from the crush washer where it screws into the engine, Ive searched the threads - and looked up the FSM - it says to pump the tensioner with engine oil - I can do that - but when I remove it from the engine wouldnt it already be filled with oil by pumping it - I figured pumping it in a can of oil with jack against a subframe of the car.

I planned to remove tensioner and install a new crush washer with a little hylomar or type 2 sealant - is it doable - any hints to prevent disaster - like overloading the chain.

Jeremy5848 · #2 04-23-2011, 12:21 AM

FSM is talking about installing a complete new tensioner. If you remove your existing tensioner just long enough to pop in a new seal ring, you should not have to do anything else except wonder why it's leaking in the first place.

Zulfiqar · #3 04-23-2011, 02:08 AM

oh thats great then.. simple job

86-300sdl · #4 04-24-2011, 10:55 PM

Just be very careful not to cross thread on the install. You'll likely be holding the unit at an angle and putting some pressure on the unit to compress the pin against the rail and it is easy to get a couple of turns (rotations) in cross threaded. The threads are pretty fine...I think 24mm 1.5's and crossing threading is not so obvious. You know…that barely mushy feeling. If the tensioner does not spin in with the same torque tension from start to end best stop, back it out and inspect the threads.

I got about three or four turns in and thought it was just the pin compression requiring more torque. Ended up only messing up a couple of head threads. Cleaned them up with a tap.

Re filling with oil… easy to just put the thing in a bowl of oil up over the top of it and pump (compress the pin) it up with oil. You’ll see the air bubble out of the oil hole.

Let us know if you get in trouble. Amazingly I found the tap set at Harbor Freight & no where, I mean no where else. Not even tap & die tool companies.

Rob

Zulfiqar · #5 06-07-2011, 10:54 PM

my chain tensioner was loose hence leaking oil, a tightening with a 32mm solved that

Oldwolf · #6 06-08-2011, 11:58 AM

Can a tensioner somehow lose it oil and collapse? In other words, do tensioners ever go bad? I'm trying to track out an intermittent noise in my 602. Guess I'll take out the tensioner and see what it looks like. Can I reuse the seal ring?

Stretch · #7 06-08-2011, 01:39 PM

Quote:

Originally Posted by Oldwolf

Can a tensioner somehow lose it oil and collapse? In other words, do tensioners ever go bad? I'm trying to track out an intermittent noise in my 602. Guess I'll take out the tensioner and see what it looks like. Can I reuse the seal ring?

I'm not sure about the tensioner on your cars - but for an OM617 I get the impression that the oil in the tensioner acts as a damper for a spring. It could be the same design for you guys - ask someone like babymog to confirm this though...

compress ignite · #8 06-08-2011, 06:03 PM

1.Can "Go Bad" and need replacement
2.Seal ring is "One Time Use Only" (The Torque necessary to secure deforms)

alphadeltaromeo · #9 06-08-2011, 06:20 PM

Yes they can go bad. Mine was leaking out the end of the tensioner. I just replaced mine a few thousand miles ago. No more leaks. Very simple to install. Agreed on the not needing to oil it...just keep it horizontal and you should be fine.

Oldwolf · #10 06-09-2011, 07:37 AM

So then a "bad" tensioner will not dampen correctly? I guess I'll know its bad when I see it out of the engine.Is there a procedure to check the tensioner?I didn't see anything in the FSM.