Fan Belt Roller
The bearing inside the fan belt roller sensor can become
dry and rusty over time and starts to squeak. It usually starts to make the
squeaking noise only in the morning but eventually the problem will get worse and the
squeak will remain constant. I believe moisture plays a big part on the cause of
this problem, and when the bearing gets dry it will starts to squeak. Most
often the squeaking noise has been blamed on the belt, but the roller is also one place to
check for the source of the noise.
The fan belt roller in the part catalog is called
"sender", since the only function of the roller is to send a signal to the DME
telling it that the fan belt is functioning properly. On all 993s prior to 1997 the
fan belt roller part number is 964 106 035 07, after 1997 an updated roller part number
993 106 035 00 was introduced.
Tools required for this DIY are:
5 mm allen socket
There is only one 5 mm allen bolt that
holds the fan belt roller in place. To remove the 5 mm bolt I strongly recommend
using a 5 mm allen socket to remove this bolt. Because of the limited space you have
to work with you will be tempted to use an allen key, but I strongly suggest against this
Prior to the removal of the fan belt roller
I had to make a slight modification to my 5 mm allen socket in order for the tool to fit
in the confined space. As you can see from the picture the allen shaft on the allen
socket is quit long. I had to cut a section of it off in order for it fit into the
engine bay with the ratchet attached.
Be very careful once the
bolt has been loosen to take the bolt off first before you remove the fan belt
roller. Because if you are not careful and bolt will fall off and you will have one
heck of time to fish it out from under the crank pulley.
In my case I used some "Break
Free" lubricating oil to soak the roller bearing assembly with oil. "Break
Free" oil can be picked up from many firearm shops, it is primary used to provide
lubrication and protection to firearms.
I poured some oil in the bearing area and
had it soak over night before installing the roller unit back on to the car.
Reinstall the fan belt roller and you are
done. The squeaking noise will not come back for sometime.