BMW M5 Forum and M6 Forums banner

1 - 17 of 17 Posts

·
Registered
Joined
·
497 Posts
Discussion Starter · #1 ·
Replaced the the tensioner yesterday for the S50B32. Below a pic of the oldone. Seems clean doesn't it:p:p. Truth is: It was loose and it was terribly messy downthere (oil, sand, sludge....)...in fact the whole area. Can't really tell whether it's now running more smoothly. it already did with the oldone....
Anyways, the tensioner leaking is now stopped:cheers:

<img src="http://showcenter.slotracinglemans.com/media/index.php/m5/DSC04078.jpg?action=resize">
 

·
Registered
Joined
·
7,672 Posts
Well done old boy ......it seems that your pro-active maintenance may have averted a possible Bankrobber type disaster !

Faz has mentioned the tendency of the original tensioners to unwind and back out of their housings in several of the M5s that he has worked on in the recent past .
 

·
Moderator
Joined
·
10,459 Posts
I did my tensioner today as well. Was doing the thermostat etc and had relatively easy access. Will double check that torque setting tomorrow am, missing a coolant hose, so couldn't finish. Seemed too easy.
mike
 

·
Registered
Joined
·
526 Posts
I'm still getting to grips with the 3.6L E34 M5 ownership.

Can someone please post the correct BMW part number for the S50B32 chain tensioner mentioned above, thanks
 

·
Registered
Joined
·
35 Posts
Must be the week of the tensioner: I did mine last Thursday.
Old one was still OK, but changed it just as pre-caution.
Also had the thrust-arms done, together with rear axle mounts. Very smooth drive again; all vibration in the steering wheel is gone!

Erik
 

·
Moderator Emeritus
Joined
·
4,273 Posts
I have installed the S50B32 tensioner in many //M5 over the last 9 months.
4 of them were loose / & or leaking.

The installation torque figure of 70 Nm is critical.
Don't guess it !
(Thanks to Raymond for his excellent past article on this subject:applause:)

:cheers:
Farrell
 

·
Registered
Joined
·
497 Posts
Discussion Starter · #9 · (Edited)
Torgue

The installation torque figure of 70 Nm is critical.
Don't guess it !

To Farrell,

Do you mean critical in temrms of nothing less so 75 nm is ok as well? Or do you mean certainly no less the 70 nm AND no more the 70 nm, because of the leaking danger or that it might come loose with any lesser torgue?
 

·
Registered
Joined
·
1,210 Posts
Thanks, Raymond.
One more question - typically what sort of mileage before the original chain tensioner starts causing start up noise, rattling etc?
Hi, the original tensioner can last well over 100k miles before you have a problem with it, but it may not be noisy before/if it fails.
The general feeling on the board is that it is a sensible preventative measure. It is a relatively cheap part which is fitted fairly easily - neither can be said for the consequences of a failure.
 

·
Registered
Joined
·
13 Posts
I just changed mine last weekend too!

It must have been something in the BMW universe that had at least 3 of us swapping S38 for S50 tensioners. With the stat and cross over pipe out, it was easy, especially with Raymond's outstanding directions. lots of parts still missing, so it will be a few more weeks before I can fire it back up and see if there's any difference. My old tensioner was still at or near spec torque. Eric
 

·
Moderator
Joined
·
10,459 Posts
well, i did it correctly. After triple checking my torque, i reassembled the car last night, filled and bled the cooling system (again, easier than i expected) and fired up the car. All is working nicely, and it's good to have a functioning thermostat! (the original motivation to start this refreshing).

I notice no difference in engine sounds etc, but it was a prophylactic replacement of the tensioner anyway, the old one was working find and not leaking.
 

·
Registered
Joined
·
13 Posts
Mike,

Did you check cam timing per Raymonds recommendation? I assume that requires removing the valve cover, which I'd rather not do since I just put a new gasket on last summer when doing the valve adjustment.

Eric
 

·
Moderator
Joined
·
10,459 Posts
Mike,

Did you check cam timing per Raymonds recommendation? I assume that requires removing the valve cover, which I'd rather not do since I just put a new gasket on last summer when doing the valve adjustment.

Eric
No i didn't. I'm a lazy risk taker!
:cool:
 

·
Registered
Joined
·
54 Posts
Must be the week of the tensioner: I did mine last Thursday.
Old one was still OK, but changed it just as pre-caution.


Erik
Did mine yesterday to, has been a niggle in the back of my mind for a while now.....
 
1 - 17 of 17 Posts
Top