Super charger pulley

[melhookv12]

Looking for opinions. I purchased a smaller upper pulley. I have damaged the shaft on removal. The new pulley worked it's way off. The seller kindly supplied a new one. I didn't think the marks on the shaft would matter.
I fitted the second pulley and that has worked it's way off.

Both pulleys were cold pressed on. The supplier says I have damaged/bodged the shaft. I didn't mention the damage as I didn't think it would effect it.

In our first conversation he mentioned that maybe the shaft was at the lower size limit and the pulley was at its upper tolerance.

What did you guys think.

Edited by melhookv12 on Sunday 14th January 16:02

Edited by melhookv12 on Sunday 14th January 21:10

[TooMany2cvs]

melhookv12 said:

In our first conversation he mentioned that maybe the shaft was at the lower size limit and the pulley was at its upper tolerance.

And what do the digital calipers say?

[Boosted LS1]

Looks like the pulley has spun on the shaft. If so it wasn't a tight enough fit. Why don't you pin the next one?

[k20erham]

Hi pin or key the next one, was the original steel and the replacements alloy? are you running megga boost now?

[melhookv12]

TooMany2cvs said:

melhookv12 said:

In our first conversation he mentioned that maybe the shaft was at the lower size limit and the pulley was at its upper tolerance.

And what do the digital calipers say?

I don't own anything accurate enough to measure either parts.

[melhookv12]

k20erham said:

Hi pin or key the next one, was the original steel and the replacements alloy? are you running megga boost now?

Do you mean woodruff key ? Cotter pin ?

Would a woodruff key stop it coming off? I suppose it would stop it spinning on the shaft?

It's a 10% Pulley. Not sure of boost increase, but it's a known mod, gives about 20-40 bhp and the same ft/lbs depending on who you talk to. Power is mush lower down and I can feel the difference.

Need to check but pretty sure it's a steel pulley.

Edited by melhookv12 on Monday 15th January 07:13

[E-bmw]

2 things.

Was "cold pressing them on" the recommended installation method? I ask as I recently fitted one to my Cooper S 'charger & the recommended method was hot pressing & it was specifically mentioned that this was to make sure of the best interference fit.

Can you get the type that "clamp" on (see below) rather than press on? as this may clamp up to a slightly smaller dimension.

http://www.kavsmotorsport.com/mini-tuning-products...

[melhookv12]

E-bmw said:

2 things.

Was "cold pressing them on" the recommended installation method? I ask as I recently fitted one to my Cooper S 'charger & the recommended method was hot pressing & it was specifically mentioned that this was to make sure of the best interference fit.

Can you get the type that "clamp" on (see below) rather than press on? as this may clamp up to a slightly smaller dimension.

http://www.kavsmotorsport.com/mini-tuning-products...

yes instructions said to use a press. the vendor asked if I had heated the pulley as he thought I might of overheated it.

[Boosted LS1]

Pinning, is done by fitting the pulley and then drilling into the nose of the shaft and partially into the i/d of the pulley. Then a pin is tapped into the hole.

[melhookv12]

Boosted LS1 said:

Pinning, is done by fitting the pulley and then drilling into the nose of the shaft and partially into the i/d of the pulley. Then a pin is tapped into the hole.

Like a roll pin ?

According to installation instructions it should just be pressed on. I will have to speak to a local machine shop.

[liner33]

You have to be very careful pressing them on, a garage ruined my Jag supercharger by fitting an uprated pulley and they do loads of them

As I understand it , you cut the old one pulley off and heat up the new one and push them on by hand , even a tap with a hammer can knacker the bearings in the nose of the supercharger

[PhillipM]

Yeah, most of those should be hot shrunk, otherwise you gall the pulley on the shaft and it screws up fit. Not to mention the pressure on the supercharger bearings axially brinells them.

[Boosted LS1]

melhookv12 said:

Boosted LS1 said:

Pinning, is done by fitting the pulley and then drilling into the nose of the shaft and partially into the i/d of the pulley. Then a pin is tapped into the hole.

Like a roll pin ?

According to installation instructions it should just be pressed on. I will have to speak to a local machine shop.

It's a solid round pin, probably made from tool steel or something hard.

[GreenV8S]

liner33 said:

even a tap with a hammer can knacker the bearings in the nose of the supercharger

I guess you're dealing with Eaton or similar. Don't you take the front housing off before pressing the pulley on? That way you can react the forces directly against the shaft and none of the bearings get involved.

[liner33]

GreenV8S said:

I guess you're dealing with Eaton or similar. Don't you take the front housing off before pressing the pulley on? That way you can react the forces directly against the shaft and none of the bearings get involved.

Yes Eaton TVS, removing the front coupler is about 5 hours work , the entire supercharger needs to come off to do it

Its not required provided you are careful doing it

[GreenV8S]

liner33 said:

removing the front coupler is about 5 hours work , the entire supercharger needs to come off to do it

Wow, that does seem like a lot of work and I can see why you'd want to avoid it. I guess I'm spoiled.