Just an FYI for all the do-it-yourselfers out there:

Instead of just shelling out $170 for a remanufactured nose drive, I figured I'd do a littel research. I assumed that all a new nose drive was, is an old one with new bearings and seal, boxed with some special gasket compound and oil. So I decided to bite the bullett and tear mine a part to see what could be done. You see, we have a local bearing shop that has every bearing ever made, so I figured that odds were in my favor.

After pulling it apart this is what I found:

UPDATE:

Front Bearing P/N: NSK 6204 ($3.71)
Front Oil Seal P/N: CR 7965 ($3.25)
Rear Bearing P/N: NSK 6303 ($6.27)
Lockrite Gasket Maker: ($6.00) - Anaerobic - 'for aluminum'
*4oz S/C Oil: ($7.00 )

*Any GM parts dealer, Info courtesy of Magnuson.

TOTAL cost for complete nose drive rebuild...PRICELESS (Under $30.00)

I actually got Koyo replacement bearings, I'll UPDATE with the proper cross reference P/N's later today.

UPDATE:
It looks like the model numbers are the same for Koyo and NSK, like somebody else mentioned.

I hope somebody else can benefit from this info, Enjoy!!

 

Awesome, are the bearings pressed?

Thanks!

 

Yup, but with a socket, an BFH, and a little TLC, you can tap them out no problem. We didn't bother using the press, I just get nervous when I can't tell how much pressure is where, just imagine cracking that aluminum housing :pat:

 

Koyo uses the same industrial standard bearing numbers as NSK. It should be a 6402 as well.
Then you're back where you started. No big deal (except to the wallet). It's not like it's an irreplaceable, out-of-production part.

 

You could even have one machined up if you cracked the original.
Might cost you a few $$$ though.

 

Yeah, it wouldn't be the end of the world if something happened, you'd just lose your core deposit. I just wanted to point out that you can still do this yourself even if you don't have access to a press. That might scare some people off from trying it.

 

Great info Yoda-g2! You should do a full write up with pics.

Mike

 

I agree totally!!!!!
Please help us all out and do a writeup and submit it to Corey for posting in the tech section.

 

I updated the part and price info.


:pat: Ok, don't hate me, I didn't have my digi cam when I took this all apart, and now it is nicely installed on my S/C, which is on my rig... :pat: I should've thought about a write up. Sorry I'm not worthy to be a YT member.

To redeem myself though, if someone is thinking of doing this, they can mail me their nose drive and I'll happily do the swap for them, and do a write up. Any takers???? Mine was a 1st gen S/C, but I assume that the 2nd gens should be just as easy.

Let me know!

 

Good work!

What is a good source for the seal?

Gadget

 

What's so special about this oil? My supercharger uses standard 75w-90 gear oil.

 

Judging from the looks of the oil, 75w-90 would be WAY too thick. Magnuson, the company that makes the S/C, recommended only using the specified oil for it. I believe that it is a special full synthetic blend, but I can't say for sure.



Thanks, the seal is from a local bearing specialty store, I don't think they do internet ordering though, I could act as a middle man if anyone is interested in purchasing some.

 

Some superchargers use engine oil. Some use gear oil. Some are tapped into the engines oil system.

The Eaton superchargers have a sealed gear box and they use a special synthetic oil that has about the same consistancy as water. The GM dealer is the best cheapest place to get it from.

Gadget

 

Plus, the smell from this SC oil will keep you coming back for more.

 

PS For anyone interested, I did a write up on how to change the nose drive without removing the SC. Do a search on my name and nose drive to find it.

 

yoda-g2,

Great info! Thanks for the effort

 

mhawker, I searched YT forums and came up with one hit and it wasn't your write-up. This was on a 1st Gen S/C - I'd have to see it to believe it.....

 

I know this is an Old thread..... but does anyone know if replacement bearings and replacment numbers are the same for the 2nd Gen S/C as for the first? I'm about to replace my bearings in my 2nd Gen (makes a bad bearing sound) and wanted to use these part number references...

 

bump, i have a 2nd gen with 115K miles on it. I want to replace the bearings before they go bad. Anyone know if the part numbers are the same?
thanks

 

i dont have the part numbers but theres some ppl on ebay who sell the complete kit. decent price. with everything needed