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-   -   What is the trick to installing new fan belt? (http://forums.pelicanparts.com/porsche-911-technical-forum/514808-what-trick-installing-new-fan-belt.html)

mca 12-05-2009 11:09 AM
UPDATE:

Forget about that Porsche/Goodyear belt. I went back out there and continued to turn the nut and the engine. The fan started to scrape on the housing at the bottom of the housing. This was with 6 shims on the inside! That belt is simply too small.

Put the Contitech back on. 1 shim in and 5 out and I am good to go now. Hopefully this won't need to be adjusted any time soon. It has about 9k miles on it so I imagine it has already done a good bit of stretching.

I am going to return the Porshe belt since I can't even use it as a spare.

Thanks all!

mca 12-05-2009 11:10 AM
Quote:
Originally Posted by Wyvern (Post 5050905)
I thought the magic number of total shims was 7
any combination but always 7
No ... 6 shims only.

Formerly Steve Wilkinson 12-05-2009 11:19 AM
The magic number of total shims is 6
Any combination but always 6.
Trust me.

RoninLB 12-05-2009 02:07 PM
Quote:
Originally Posted by mca (Post 5050928)

I am going to return the Porshe belt since I can't even use it as a spare.


cool.. 'bout time one of my wild gueses was worthwhile

Gumba11 12-05-2009 05:02 PM
Quote:
Originally Posted by kodioneill (Post 5050505)
Ahahahahahahahahaaa! :eek:

mca 12-07-2009 09:46 AM
Maybe this should be a new topic.

I noticed that 76-79s use a 9.5 x 725 belt and the 80-83s use 9.5 x 710. Is this due to a difference in pulley size? Did it change in 1980?

Also, for those of you that run the 9.5 x 710 Porsche / Goodyear belt ... mine says "made in Mexico". I thought that they were always made in the USA.

Still trying to figure out why the 9.5 x 710 won't fit my 82 sc.

bdisco 12-07-2009 10:43 AM
Quote:
The magic number of total shims is 6
Any combination but always 6.
Trust me.
^ I heard this as : Then, shalt thou count to six, no more, no less. Six shalt be the number thou shalt count, and the number of the counting shall be Six. Seven shalt thou not count, nor either count thou five, excepting that thou then proceed to Six. Eight is right out.

:)

kodioneill 12-07-2009 10:52 AM
Quote:
Originally Posted by bdisco (Post 5054738)
^ I heard this as : Then, shalt thou count to six, no more, no less. Six shalt be the number thou shalt count, and the number of the counting shall be Six. Seven shalt thou not count, nor either count thou five, excepting that thou then proceed to Six. Eight is right out.

:)
Brother Maynard Bring out the holy fan belt of Antioch.

gtc 12-07-2009 10:58 AM
There were different fan diameters throughout the years, which I guess may account for all the different belt sizes. Are your replacement fan and shroud the same as your original parts?
Even if they are the same, I have seen other people complain about the Porsche belts not fitting right.
FWIW, the Contitech belts work great for me. They don't seem to stretch - I just replace them when scheduled or when they look old. I have never needed to adjust the spacing of the shims.

mca 12-07-2009 11:23 AM
Quote:
Originally Posted by gtc (Post 5054765)
There were different fan diameters throughout the years, which I guess may account for all the different belt sizes. Are your replacement fan and shroud the same as your original parts?
Even if they are the same, I have seen other people complain about the Porsche belts not fitting right.
FWIW, the Contitech belts work great for me. They don't seem to stretch - I just replace them when scheduled or when they look old. I have never needed to adjust the spacing of the shims.
It is possible that the new fan is the source of the problem. I ruled out the pulley b/c I tried installing the belt with the old pulley and it wouldn't work either.

I put the ContiTech back on and all is good. I would have thought that a 10 x 710 would have been TIGHTER than a 9.5 x 710 ... so why isn't it?

My local shop said that they have never had an issue with the Porsche belt being too small. So either the ContiTech is wrong or the Porsche belt is wrong.

FWIW ... I called Pelican and their Porsche belts are made in the USA. The one I got from my local shop is made in Mexico. Could there be a quality difference between the two?

86 911 Targa 12-07-2009 12:22 PM
Quote:
Originally Posted by mca (Post 5050477)
Got myself a new OEM fan and outter pulley. Figured I add a new OEM fan belt.

The belt is a Genuine Porsche belt 9.5 x 710. I can't even get the outter pulley to mate with the fan. It is really close though.

The newness of the pulley and fan make for a very snug mating fit which is adding to the difficulty ... but they do fit b/c I tested prior to trying to install the belt.

Is there some way to make the belt more pliable? Can it be heated up? What is the trick? My tech warned me that it would be difficult when I bought the belt on Friday.

FWIW: Previously I was using a Contitech 10 x 710 belt which I installed new a few years ago. After a year I was only using 1 shim inside of the pulley and 5 on the outside. I tried to install the Contitech with the new fan and pulley but it is too loose even with 0 shims in and 6 shims out.

Thanks,
Craig
Please check one of my earlier posts for our '86 on this subject.

Ours was 4 & 2 w/ Porsche OEM belt.

Good luck,

Gerry

Pics included.

mca 12-07-2009 12:33 PM
Quote:
Originally Posted by 86 911 Targa (Post 5054942)
Please check one of my earlier posts for our '86 on this subject.

Ours was 4 & 2 w/ Porsche OEM belt.

Good luck,

Gerry

Pics included.
If you followed the rest of the post you would see that the 10 x 710 ContiTech fits and the Porsche belt does not. It is too small. With zero shims it was causing my fan to rub on the fan housing.

My question at this stage is mostly focused on variations in the Porsche belt. Specifically those made in the USA (sold by host) and those made in Mexico.

Formerly Steve Wilkinson 12-07-2009 02:45 PM
I think anything labeled "gen-yew-ine Porsche part" these days might well mean gen-yew-ine junk. Including our Boxster.

mca 12-07-2009 03:10 PM
Quote:
I think anything labeled "gen-yew-ine Porsche part" these days might well mean gen-yew-ine junk. Including our Boxster.
You said it. I just dug up my original Porsche belt ... made in the USA.

Flat6pac 12-07-2009 04:52 PM
If you put grease on the shims, they ll stick together and stay where you put them.
Bruce

John W. 12-07-2009 05:05 PM
I read somewhere where the OEM belt will losen up after driving so you need to check frequently for the first 100 miles. The conitech is not supposed to stretch.

rusnak 12-07-2009 07:40 PM
I was reading through this thread thinking "that guy has the wrong belt". Forget the Porsche. Buy the Continental belt. You can try a local auto parts store as well. Never a bad idea to have an extra belt anyway.

As for the shims, no need to use tape or grease. Get the nut finger tight, then start to push them under the cap washer. The inner shims will stay on the inner pulley half. Don't go full tight on the nut until you've turned the fan around and have all the shims under the washer.

86 911 Targa 12-08-2009 06:16 AM
Quote:
Originally Posted by mca (Post 5054970)
If you followed the rest of the post you would see that the 10 x 710 ContiTech fits and the Porsche belt does not. It is too small. With zero shims it was causing my fan to rub on the fan housing.

My question at this stage is mostly focused on variations in the Porsche belt. Specifically those made in the USA (sold by host) and those made in Mexico.
I can only post what worked on our '86.................


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