MT0911

What's up guys - so I have a Paxton Novi 2000 Head Unit that I've been running between 18 - 22 lbs of boost through for the past couple years and it just started leaking oil out of the rear. I pulled the blower and there is no shaft play - it spins very nicely; I'm thinking the rear seal took a ****. Oh well. The last time it was rebuilt was about 7-8 years ago by Paxton but now they are telling me they can't rebuild it because they updated their design.

Can you guys recommend me a good rebuilder for centri blowers that know what they are doing?

I've spoken to both Jon Bond Performance and 928 Motorsports and both companies are very nice, and sound like they've been around the block. Never had a chance to deal with either so if you've had experience, let me know! Recommendations are appreciated guys!

DOUG @ ECS

Replacing a seal is pretty straight forward if you would like to try it yourself. You can get the seal at www.superchargerrebuilds.com

If we can help let me know.

Unreal

You can get seals locally too. I've always found them at carquest or napa. Super easy. I've replaced 3 of them now.

96TTdodge

I was planning on putting new seals in mine too, but I don't know how to tell what seals need replaced. Input/output shaft seals or case O-rings? Is there a way to tell which is the culprit?

MT0911

Thanks a lot Doug. I appreciate you extending your help! I heard on another site that the part number for the seal is:
Chicago 9838
or
Federal Mogul 472311

I do all the work on all my cars minus machining so I don't have a problem giving it a shot. If it's straight forward then I'll start taking it apart this week and see what needs to happen. I'll let you know if I need help! Thanks a lot brother!

Right - I found them locally at the same places. I'll try to knock it out this week. Thanks man!

Unreal

Just as easy as replacing any other seal Use a pick/seal puller to remove, and then press new one in. Mine got taken out when a belt broke and got wrapped around the shaft and killed the seal.

MT0911

I haven't started taking it apart yet - (ordered the seal and just waiting on it now). I was thinking the front case had to come off and then the seal knocked out. You can replace the seal without removing the front case?

I went on a couple other forums and found some great info on rebuilding them. I think I might take the front cover off to at least inspect everything but judging from how well the blower was doing prior to the oil leak, I may end up just replacing the seal.

Unreal

I did mine on the car twice without doing anything but removing the pulley. Just pop the seal out and push the new one in.

MT0911

Nice and easy. That's always good to hear

Thanks brother!!

MT0911

Ok so I got a couple questions. I got the new seal in the mail. Everywhere I look online I see the front cover on the blower having this type industrial seal:

This is NOT my blower, just an example of the seal


I started taking apart my head unit and this is what I see:

This is MY head unit


This is inside the front cover:


Upon further inspection of the blower. Good news - Bearings are in great shape and the gears look perfect as well.




Has anyone dealt with this type of seal? Or know what is needed to replace it?

Thanks in advance!

MT0911

Actually, I should have just looked at it closer before posting all that above. Looks like it knocks out the same way as the other seal. The outside was just throwing me off. Going to knock it out now and put the new seal in. No more confusion lol.

MT0911

Yep - after having my "stupid" moment, I got it.



The new seal is going in now then I'll start buttoning the blower back up.

BLOWNBLUEZ06@RKT Performance

In case it helps the future readers:
I pull the seals out by carefully running a drywall screw in (just a little) and using a hammer claw to pull it out. :-)

4DRUSH

Pretty high tech tip right there, thanks Bret

a/c man

cool tip should make the seal come out easy with less damage to cover

MT0911

That is a good tip. I decided to take the front cover off anyway to inspect but if someone knows it definitely the seal then this is a simple way of doing it

MT0911

By the way - I figured I go ahead and post the update for those that want to see. The seal definitely failed. It was pretty rough.

Here is the new seal next to the old one:


Here it is freshly seated onto the front cover:


Here is the front cover bolted back in. I figured out you have to be very careful putting the cover onto the shaft or you risk damaging the new oil seal. It's easier to slip on if you put a light film of oil on the lip (similar to how you install a rear main seal) and then use the carboard that the seal was packaged in to make sure the lip doesn't fold over when pressing the cover onto the shaft. This is because the ID of the new seal is a tighter fit since it's of course brand new.


Here is everything buttoned back up. Next step is to install and we should be in good shape

96TTdodge

Bringing this back ttt.
Anybody have a part number for the big o'ring seal for the front housing?

MT0911

Late on the response but in case this helps others. Here are the part numbers for the Oil Seal. I used Chicago Rawhide 9838 and it was a perfect fit.

Federal Mogul 472311 (size is 1.000 x 1.437 x 0.250)
Chicago Rawhide 9838

The front housing seal is just a large O-ring. I didn't replace mine since it looked to be in perfect shape. But I've heard from others if you just head down to your local parts store; they should carry them and the price is around $1.00 or so.

blown81bu

good info here thanx guys

i think thats the only thing that goes wrong with these blowers..bulletproof