Mercedes-Benz Forum banner

Pully Question

1496 Views 13 Replies 5 Participants Last post by  Merc600sec
The waterpump just went out on my 96 S600 with 105k miles. Not bad. Fortunately for me I was a 1/2 block from the house. I'm looking up parts and I need to replace everything and have found all but the tensioner pully. My questions are:

1) Are the pullys for the idler and tensioner the same?

2) When replacing the thermostat, do I have to replace the housing too?

3) Do you reccommend replacing the belt tensioner mechanism too?

Thank you for your input.
1 - 7 of 14 Posts
I checked the tensioner spring and it's strong as an ox. But who sells the tensioner pullys other than the dealers? I couldn't find them on RockAuto, Bimmerspecialists, or RMEuropean.

Merc600sec, to answer your question, my car was making a funny noise from the waterpump area, and the dealer checked it and said that wp was gona eventually need to be replaced. Also when I checked under the hood you could see some belt debris on the water pump pully.
then thats a belt replacement first.. not a pump... the idler pully and the tensioner pully and the water pump you can check when you have the belt off...
My S600 took off the belt it's self. I tried turning the water pump pully and I couldn't get it to turn.
I had the same thing happen at about the same distance from home. We were lucky. Have you come across this, yet?

V12 Uber Alles, Water Pump and Thermostat Replacement in a W140 Mercedes Benz, article by Brett Allison

I think the tensioner pulley is a dealership only item. I didn't replace my tensioner, just the pulley. I think the thermostat is integral to the housing. I didn't study it enough to see if the thermostat could be removed easily. Just replace the whole thing and be done with it.

Thanks for the info. The pully spins fine but I'm gone replace it anyways this spring before I take the S600 on a road trip.
First of all I gota say, Merc600sec..... it was the water pump that went!

Here are the pics om my old and new water pump. The defective one it the $300+ Laso pump. My new one is a A! cardone which had the factory part number and the Mercedes star on it. Plus build and material quality in my opinion. The job took 6 hours to compete. I'm just glad I have my S600 back.

See less See more
The other thing is that I had to fight to get the fan and water pump pully off the stupid Laso pump, but they fit like a glove on the A1 Cardone.

Laso just roped my money out of my wallet. F%@k em!
See less See more
I got all the pieces, nothing inside the block. I just never seen that before. Now that is over I'm gona give my S600 a good detail and take it somewhere to get the engine steam cleaned.
1 - 7 of 14 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.