Groves formed on my alternator pulley

[richparker]

I have been using a CB 1914 billet alternator pulley on my bus motor for the last 17,000 miles. Over that time I’ve noticed that the face of the alternator has been turning black. I recently put a new smaller belt on, which I feel better matches the 6 3/4" Equalizer crank pulley I’m using. Anyway, when I pulled the alt pulley off I noticed there were deep groves on both sides and some gouges on the inside surface.

What do you think caused this to happen?

_________________
__________
’71 Westy build
Adventure thread
’65 Deluxe Build

[modok]

it's aluminum
not going to last forever.

I'm amazed that it hasn't worn through the anodizing entirely by now!

[oprn]

More useless show car bling! Put the stock steel pulley back on if you are going to actually drive the car.
_________________
Our cars get old, we get old but driving an old VW never gets old!

[borninabus]

hard to tell from the pics, but to me it looks like the \/ of the pulley doesn't match the \/ of the belt. i would try running the new, improved belt and see if the wear pattern improves or declines.
_________________
88 Van WBX, A/T - 13 JSW TDI 6M/T - 2012 Touareg TDI Sport

[richparker]

I installed a new belt and pulley. CB was out of the stock steel pulleys, so I bought another Billet one. I did not want to make the trip down to Flagstaff for the Jamboree next week with the grooved pulley. I’m on the email list to be notified when the steel pulleys are back in stock and I will order one then.
_________________
__________
’71 Westy build
Adventure thread
’65 Deluxe Build

[borninabus]

the only thing i see out there for steel pulleys right now is JP Dansk.
so yeah, i'd use the aluminum one too. or a nice OG from the classifieds.

i'll say hi if i see you
_________________
88 Van WBX, A/T - 13 JSW TDI 6M/T - 2012 Touareg TDI Sport

[RickS]

[chrisflstf]

These are nice steel pulleys:

https://www.csp-shop.com/en/brand-shops/generatora...1599600842

[modok]

Cb is not out of alternator pulleys.


This unit mimics the look of a generator pulley

[richparker]

[RickS]

[modok]

The alternators use the pulley with the fan blades on it
or, am I mistaken?

[74 Thing]

Powder coat is the way to go but make sure to tape off the shaft hole.

If you want to spray one yourself use some Spraymax 2k gloss black paint and wear protection when you spray it. Of course prep it as you would normally.

Search for: SprayMax 2K DTM Topcoat 3680222

[richparker]

[onwardtothestars]

[oprn]

If I recall correctly the stock generator is cooled by the engine fan drawing air through it from the slots in it behind the stock pulley. There was some debate recently on a thread here as to whether or not a pulley with a fan enhances or detracts from that airflow.

I don't know as I have never found a need for upgrading my type 1 engines to an alternator. A generator in good nick supplies all the charging I have ever needed.
_________________
Our cars get old, we get old but driving an old VW never gets old!

[onwardtothestars]

[richparker]

[Simon DeCasas]

Is the back half of the pulley on the shaft hole supposed to have a slight chamfer or completely flat? I had a rash of pulleys come loose with the chamfer then I found one that was flat no chamfer to but up against the bushing on the generator and it stop self-destructing usually in 5 to 6k in one case i had to find a new bushing for the generator because it mushroomed out where it met the pulley, this happened both on my Type 3 and Bug.

[modok]

Good point. A big chamfer would be no good. Those details matter.