McMaster Part # for fan rivets

[Dpmulvan]

Anyone know the part number for alt fan rivets? Thanks

[911pcars]

There are fan rivets and there are Porsche fan rivets.

They're metric and were like hen's teeth to source awhile back. Good luck. I think fan rebuilders might be loathe to share their sources.

[Flojo]

as an alternative you can source little screws to fasten the pulley half to the fan.
You'd not be the first to go choose that option.

[75 911s]

Supertec had a kit at one point. Personally, I plan to buy replacement rivets at aircraft spruce in hard aluminum for the center I am re-zinc-ing. The fan has to be balanced again after this process by drilling small reliefs in the back side. You might be able to mark it before disassembly and orient it back the same way.

[Jonny042]

Originally Posted by 75 911s

Supertec had a kit at one point. Personally, I plan to buy replacement rivets at aircraft spruce in hard aluminum for the center I am re-zinc-ing. The fan has to be balanced again after this process by drilling small reliefs in the back side. You might be able to mark it before disassembly and orient it back the same way.

AN rivets don't come in metric. I had to order in bulk from Europe as I couldn't find a source in NA.

The fan will only go back together one way. The holes are not evenly spaced. I'm not convinced of the need to re-balance, unless you've removed a large amount of mass from somewhere?

[Jonny042]

Originally Posted by 911pcars

There are fan rivets and there are Porsche fan rivets.

They're metric and were like hen's teeth to source awhile back. Good luck. I think fan rebuilders might be loathe to share their sources.

This - it seems the forum becomes more and more a place to advertise parts and services than to share information, these days. I figure even if you share your methods and are completely open you are going to generate more business than you would if you are guarded. None of this is rocket science.

The rivets are DIN (deutsches institut für normung) 661 aluminum. I've forgotten the size (5mm I think), I ordered mine 20mm long and shorten them to the correct length.

I was able to find them on ebay.de but had to contact the seller to see if they'd ship to Canada.

[Jonny042]

Originally Posted by Flojo

as an alternative you can source little screws to fasten the pulley half to the fan.
You'd not be the first to go choose that option.

Countersunk screws of the correct diameter don't sit flush to the surface the way the rivets do. Of course you could further countersink the screws or maybe find a special reduced diameter screw head. In the end you'd be best off getting it done correctly.

[Arlo911]

You can order new centers including the rivets over here in Europe. Don´t know about the quality, might be crap as a lot of repro parts are nowadays.
I know you can also plate the fan without taking the center out, the plating doesn´t stick on the fan. It´s not the correct way of doing things, but I´ve seen it done.

[Jonny042]

Originally Posted by 75 911s

Supertec had a kit at one point. Personally, I plan to buy replacement rivets at aircraft spruce in hard aluminum for the center I am re-zinc-ing. The fan has to be balanced again after this process by drilling small reliefs in the back side. You might be able to mark it before disassembly and orient it back the same way.

I tried to order the kit from Supertec but they were NLA at that time and I don't think he planned to make any more - I could be wrong, and a phone call is cheap if you wanted to go that way. In the end I'm glad I restored my own.

Mine (early style) and a later one for forum user Uwon:

[Tom F2]

What kind of a tool did you use to set the rivets?

[Jonny042]

Originally Posted by Arlo911

You can order new centers including the rivets over here in Europe. Don´t know about the quality, might be crap as a lot of repro parts are nowadays.
I know you can also plate the fan without taking the center out, the plating doesn´t stick on the fan. It´s not the correct way of doing things, but I´ve seen it done.

I ordered a new center from a place in the UK, although it was a bit pricey. They are now affordably priced in the USA from rennspd. Sadly our host doesn't sell them.

The quality of the one I received was excellent, although the plating was not the greatest - it is more and more difficult to find parts plated with zinc and finished with hexavalent yellow. More often they are either zinc/clear or have a bluish tint. Nothing wrong with that, but it didn't match all the rest of the plating on the motor. I had it replated along with the pulley outer half.



As for plating with the fan in-situ, the first steps in plating are to chemically strip the old plating and get down to bare metal. This will conveniently strip the magnesium fan from the hub if that's what you're after....

[Jonny042]

Originally Posted by Tom F2

What kind of a tool did you use to set the rivets?

A rivet setting tool!!! Haha.

I had to make one in the lathe - I turned down an air-chisel drift and made a divot in the end with a ball-tip mill.

Rivet setting took a little practice - the right air pressure/pressure, etc. and different rivet lengths to get it right.

[Arlo911]

Originally Posted by Jonny042

As for plating with the fan in-situ, the first steps in plating are to chemically strip the old plating and get down to bare metal. This will conveniently strip the magnesium fan from the hub if that's what you're after....

Haha no the guy beadblasts the fan and has it plated as a whole, seems to work for him.

[Dpmulvan]

Originally Posted by 75 911s

Supertec had a kit at one point. Personally, I plan to buy replacement rivets at aircraft spruce in hard aluminum for the center I am re-zinc-ing. The fan has to be balanced again after this process by drilling small reliefs in the back side. You might be able to mark it before disassembly and orient it back the same way.

Who told you that??? The holes in the center only line up one way no need to mark or balance.

[Dpmulvan]

Originally Posted by 911pcars

There are fan rivets and there are Porsche fan rivets.

They're metric and were like hen's teeth to source awhile back. Good luck. I think fan rebuilders might be loathe to share their sources.

Ahhhh yes the mystique, the passion, the disruptor, there is no substitute for the Porsche rivet. While they loathe to share, I loathe the fan rebuilder. I shall make some metric hens teeth on my lathe and share with all for free.

[Dpmulvan]

Originally Posted by Jonny042

A rivet setting tool!!! Haha.

I had to make one in the lathe - I turned down an air-chisel drift and made a divot in the end with a ball-tip mill.

Rivet setting took a little practice - the right air pressure/pressure, etc. and different rivet lengths to get it right.

Rivet setting tools are like $20 if you don’t have a lathe.

[Carl S.]

Free hens teeth? Sounds tooo good to be true. How much would you charge for 6? I will be needing a set in the future.

[Solamar]

Originally Posted by Flojo

as an alternative you can source little screws to fasten the pulley half to the fan.
You'd not be the first to go choose that option.

Thats what I did. Sourced the proper size hardware from McMaster. Prior to plating my hub I did touch up the coutersink in the hub to the correct angle. 90* if I recall correctly.

Over 10k miles so far and not a single hickup.

edit - BelMetric PN SF5X16SS

[Jonny042]

It was bugging me that I dismissed the OP's question without actually looking..... not wanting to spread disinformation, I went to the McMaster website. Just as I thought, no metric. But these are pretty damn close:

https://www.mcmaster.com/97483A249/

They are about .009" smaller and the countersink angle is off by 3 degrees.

I'd source them from the EU in the proper metric size. Ebay is your friend, and your enemy, all on one convenient website.....

[75 911s]

Hey Jonny, Appreciate your attention to detail, but in all seriousness if it's .009 difference and you are smashing it down with a riveting tool to expand it... What am I missing here?