Tensioners & Pulleys for a Turbo

[DC911SC]

I have it in my head there are a total of 5 pulleys / tensioners / rollers on my Turbo, the belts are getting replaced and want to change those as well. However all the kits I'm looking at just supply 4............? Any idea what the part numbers are?

 

[zcacogp]

Nope, only four. Look at this;

There are nine pulleys here, including the crank, cam, water pump and two balance shafts. This leaves four idlers, which includes the one on the sprung tensioner.


Oli.

 

[944Turbo]

yes but its only the ones with bearings in that need replacing so not the water pump, cam shaft, 2 x balance shafts and crankshaft leaving just the 4 to replace

 

[zcacogp]

ORIGINAL: 944Turbo

yes but its only the ones with bearings in that need replacing so not the water pump, cam shaft, 2 x balance shafts and crankshaft leaving just the 4 to replace

'Zactly. Four is the number of pulleys you need to replace.


Oli.

 

[ChasR]

As above regarding the Turbo. An S2 (3.0 16v) however does come with 5 pulleys, yet some listings (including a well renowned retailer not far from me) will only list 4 for the S2.

 

[DC911SC]

thanks chaps it was the s2 funnily enough that threw me as to the 5.

i bought all the bits from zims in the usa so fingers crossed!

 

[zcacogp]

ORIGINAL: ChasR

As above regarding the Turbo. An S2 (3.0 16v) however does come with 5 pulleys, yet some listings (including a well renowned retailer not far from me) will only list 4 for the S2.

Interesting ... what's the fifth pulley on the S2 then?

I thought that all 944's had pretty much the same lay-out for belts - I didn't know the S2 was different.


Oli.

 

[ChasR]

This is where I wish I took a photo of the front of my spare S2 engine!

I'll try and find a diagram depicting the layouts. But in a nutshell, the balance belt layouts are the same for all of the 944s. The cam belt on the S2 however has an additional idler. It does not exert much tension onto the belt though, it looks like more a check idler (stop the belt vibrating etc.).

EDIT: Found a pic! You can see the extra idler on the S2 in between the crankshaft and tensioning pulley, where on the 8V cars there is not an extra pulley:

 

[zcacogp]

Crumbs. You're right. Thanks Chas - I never knew that! []


Oli.