jturbo

Does anyone have a link to a GOOD resource for DIY 964 Belt Replacement.

When I rev my 964's 3.6 engine upon start-up I get a belt-skreeking noise. This also occurs when I hard downshift in third?

Do you think it is the fan belt or the distributor belt?

Any help is greatly appreciated.

1990-964

Almost certainly the fan belt. You should get the tension on it checked.

dfinnegan

Your distributor belt has teeth.
If it shifts the shrieking you hear will be your own!

jturbo

The fan belt tension seemed ok? It had about 1/4 to 1/2 inch of play in the belt. Could the sound be comming from the pully?

dfinnegan

It could be your belt tension sensor. Those seem to be going bad of late.
Mine started shrieking some time ago and I pulled it and cleaned it up nicely and oiled the wheel, but it's back shrieking again. I've ordered a replacement. $70. Yowza! For a switch.

dkeen

Here is a good link showing you how to replace the belt.
http://p-car.com/diy/vbelt/

If you hear a squealing noise, its likely the v belt. The distributor belt has teeth. It cant slip, but it can break. You'll know it if it breaks. Its tougher to replace because you have to remove the distributor and take the distributor apart. I have replaced both belts and the v belt is an easy job.

jturbo

Thanks dKeen,

Are the instructions only for 993 or are they also applicable to the 1993 964?

Thanks.

jturbo

When I look at the belts that are attached to the fan I see only "toothed" belts. Where is the "Fan Belt"?

boxsey911

Both belts (fan and alternator) have 'teeth' but this is a normal V belt design - there are no slots in the pulleys for the teeth to fit in to.

dkeen

The instructions are applicable to both 993 and 964. There are also instructions on this site for replacing the belt tensioner. If the belts still squeel after replacing them, and you have them properly tensioned, the noise may be the tensioner. But it sounds to me like its one of your belts slipping. They can slip even if properly tensioned once they get old and hard.