Fan Pulley

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e3er

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Hi all,

It seems I may need part no. 115112553356 - its the fan pulley (my cooling fan is just spinning and not speeding up/slowing down) but its crazy expensive at the dealership.

Would anyone on here have a good used one or have any leads?

It's a stock 1973 Bavaria - though I'm assuming its the exact same as the e9 (there seems to be two systems - one with and one without an actual fan clutch - mine's without)

Thanks,
Chris
 
e3er said:
Hi all, It seems I may need part no. 115112553356 - its the fan pulley (my cooling fan is just spinning and not speeding up/slowing down) but its crazy expensive at the dealership.

Would anyone on here have a good used one or have any leads?

It's a stock 1973 Bavaria - though I'm assuming its the exact same as the e9 (there seems to be two systems - one with and one without an actual fan clutch - mine's without)
Click to expand...

Hello!

A "freewheeling" fan suggests it is the fan clutch that warrants replacement or service - and not a pulley.

Peruse the archives of this forum and you will discover that the fan clutch and associated parts (i.e., fan blades and water pumps) went through a marked evolution. In the picture below, the earliest setup is on the left and the latest is on the right. http://www.e9coupe.com/forum/showthread.php?t=10468

If you are running the five bladed fan, you have the earliest style mechanical friction clutch. Despite its simplicity, the friction material and the associated "drum" can both wear (just like drum brakes). Not aware of any simple fix for this other than substitution for new or unworn parts. Although the water pump design remains fairly constant, newer viscous clutch styles require different attachment designs at the pump's nose. Ergo, the reason for different pumps for different fan and clutch assemblies.

As has been discussed many times, you have four basic choices:
1. Find replacements for your current setup.
2. Run two longer bolts through the current "mechanical" fan clutch, thereby permanently engaging the fan whenever the engine is running.
3. Ditch the current fan clutch assembly in favor of a new, newer or used viscous style assembly.
4. Install an electric fan.

HTH

28.png


wdslk1zba1g2.jpg
 
Hi,

Thanks for taking time to answer my question - super helpful!

I am indeed running the early 5-blade fan - but realoem described the part as a pully hence the title for this thread...

I also have a/c so have the factory electric fan which helps alot, though doesn't solve the problem to my satisfaction.

I'll try option 1 or 2 below - the dealer wants $413 for the part new, though I get a small discount. I'm trying Walloth first, but I thought I'd post here as well.

I was a little fuzzy on the differences, but now its quite clear.

Thanks,
Chris

MMercury said:
Hello!

A "freewheeling" fan suggests it is the fan clutch that warrants replacement or service - and not a pulley.

Peruse the archives of this forum and you will discover that the fan clutch and associated parts (i.e., fan blades and water pumps) went through a marked evolution. In the picture below, the earliest setup is on the left and the latest is on the right. http://www.e9coupe.com/forum/showthread.php?t=10468

If you are running the five bladed fan, you have the earliest style mechanical friction clutch. Despite its simplicity, the friction material and the associated "drum" can both wear (just like drum brakes). Not aware of any simple fix for this other than substitution for new or unworn parts. Although the water pump design remains fairly constant, newer viscous clutch styles require different attachment designs at the pump's nose. Ergo, the reason for different pumps for different fan and clutch assemblies.

As has been discussed many times, you have four basic choices:
1. Find replacements for your current setup.
2. Run two longer bolts through the current "mechanical" fan clutch, thereby permanently engaging the fan whenever the engine is running.
3. Ditch the current fan clutch assembly in favor of a new, newer or used viscous style assembly.
4. Install an electric fan.

HTH

28.png


wdslk1zba1g2.jpg
Click to expand...
 
I run option 2 - I live in a warm climate so the fan will be on upon warming up anyway and don't want to rely on the friction clutch to keep me from blowing my head gasket.
 
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