2007 W639 Auxiliary Belt

[Paul600]

My belt has failed and I need to replace it . Is it much if a job to change it ? Also where can I get a diagram of the way the belt is routed around the pulleys ?

 

[M80]

Which engine?

 

[Paul600]

2.1 w639 without zircon. Just noticed the idler that's attached to the oil filter housing is shot . Does that just unbolt from the housing ?

 

[Paul600]

Aircon

 

[M80]

Is that the earlier OM646 engine (pre 2010 ish)
or the OM651 (later facelift Vito / Viano)?

 

[Paul600]

Is that the earlier OM646 engine (pre 2010 ish)
or the OM651 (later facelift Vito / Viano)?

It's a 2007 van

 

[M80]

I missed that in the title.
Yours is the 646.
Sorry I have a diagram for the 651, it may be useful for the tensioner pulley if nowt else.
For that a 17mm socket (star not hex) releases tension. I then use a 4mm drill bit or Allen key to insert and hold the tensioner.

I guess you've found the reason for the failure, but check all other pulleys are free.
They have a plastic cover that prises off. The Torx screw is centre. It'll be trial and error for the size.

 

[M80]

This may help, there are others available.
His suggestion that a special tool is needed to release is silly. A socket on a breaker bar is all I've ever used.

 

[Blobcat]

I missed that in the title.
Yours is the 646.
Sorry I have a diagram for the 651, it may be useful for the tensioner pulley if nowt else.
For that a 17mm socket (star not hex) releases tension. I then use a 4mm drill bit or Allen key to insert and hold the tensioner.

I guess you've found the reason for the failure, but check all other pulleys are free.
They have a plastic cover that prises off. The Torx screw is centre. It'll be trial and error for the size.

I'd also replace the tensioner at the same time as the idler... I waited then had to do the tensioner...

 

[M80]

Did you manage to get the size detail off the old belt?
That will be 6PK (followed by the length in mm).

Use Gates as a replacement, cheaper stuff 'aint worth it.

 

[Paul600]

I missed that in the title.
Yours is the 646.
Sorry I have a diagram for the 651, it may be useful for the tensioner pulley if nowt else.
For that a 17mm socket (star not hex) releases tension. I then use a 4mm drill bit or Allen key to insert and hold the tensioner.

I guess you've found the reason for the failure, but check all other pulleys are free.
They have a plastic cover that prises off. The Torx screw is centre. It'll be trial and error for the size.

Thanks very much for your help.