1995 E300D: Need advise replacing the water pump - Page 2 - PeachParts Mercedes-Benz Forum

Texasgeezer · #16 12-31-2019, 02:26 PM

I've had my tensioner mounting bolt out once. Can't recall if it was reverse thread. My guess it is tight due to the thread locker compound used on the threads. But best to verify direction before breaking the cover or the bolt. Seems like I read a few years ago where one person had damaged his cover during bolt removal.

There are several posts that mention installing a one way pulley will reduce belt flutter and extend the life of the tensioner shock, spring, and arm assembly.

In my case I drilled, tapped, and installed a small grease zerk then made my on anti-galling grease by mixing two good anti galling lubricants.

About 20,000 miles later my belt is still running without any detectable flutter.

95 E300D my new tensioner modification

http://www.w124performance.com/service/w124CD1/Program/Engine/605_606/13-3200HA.pdf this is from a really helpful site and this link gives replacement instructions

partsouq.com is a foreign site and shows part numbers based on vin #. Has been pretty much 100 percent reliable, for me, for serveral years now, hopefully that will continue.

Texasgeezer · #17 12-31-2019, 03:08 PM

This site has an image of the bolt that you can magnify by moving your mouse pointer.

https://www.ws-autoteile.com/en/belt-drive/tension-roller-lever/Lagerzapfen-Spannrollenhebel-Mercedes-W202-W124-W210-W461-W463-W140-Sprinter_A12013W503

Looks standard thread to me.

As I recall the person that damaged his cover used too much torque while tightening the bolt, not loosening it.

Zulfiqar · #18 01-02-2020, 11:35 AM

Quote:

Originally Posted by bhehmann

Thanks Zulfiqar.

Regarding the tensioner arm pin, is the thread standard, ie: counter-clockwise to loosen? It's too tight to break loose with the standard length ratchet.

Its sealed with thread sealant from the factory, you can use regular blue threadlock on the new one, Its going to take a long ratchet to break loose, dont overtorque when installing it - thats how you break the timing cover.

tip - use the old pin to make a threadchaser to clean the threads in the cover.

bhehmann · #19 01-03-2020, 06:07 PM

Quote:

Originally Posted by Zulfiqar

The belt half way off that pulley means tensioner arm and pin aredamaged and need to be replaced

It will cause belt squeal too.

The tensioner is multipart,

The arm, the pin on which it rides on, the spring and the damper.

Buy the arm and pin along with its O ring, its about 250 in parts for genuine items, O ring is very important.

Remove the alternator and get an overruning pulley installed on it, it will prevent the early demise of the tensioner arm

Zulfiqar,
I removed the entire tensioner but didn't see an O-ring. The repair manual doesn't indicate on either (see attached)

bhehmann · #20 01-19-2020, 07:00 PM

I replaced all the tensioner and all associated parts as recommended by Zulfiqar, the squeal is gone and it idles nicely now.

Thank you Zulfiqar and for all other replies, much appreciated!

Maxbumpo · #21 01-21-2020, 12:35 PM

Quote:

Originally Posted by bhehmann

Is it possible to install a new belt incorrectly?

For future readers: Yes, it is possible to get the belt routed incorrectly, and then it will be too loose and squeak and slip. BTDT.

my83300cd · #22 11-13-2021, 04:49 PM

Quote:

Originally Posted by my83300cd

Thanks for posting all the info.

The 95 e300d that my son dragged home cheap as the PO didn't have time to deal with a "running warm" issue is now to the point we can dive into that....
The injectors are rebuilt, the return lines are finally not leaking, the serpentine belt that shredded has been replaced, and the fuel system no longer looses prime when parked facing up hill. The broken heater hose that cracked at the fitting has been replaced with a new one (the used one I got from a member here lasted about 2 hrs of running time before the plastic fitting cracked)
We have a spanking new water pump, gasket, thermostat, gasket....and I just need to knuckle down.
All I want is a reliable station car, and compared to the 77 300d this thing is a rocket ship!

How time flys... life got in the way and now that the replacement belt has shredded and the tensioner pulley takes real effort to turn, its time to replace that and the water pump together.