Hi folks,

I am new to the 928 world, having just picked up a 1984 S, I am working on some of the deferred maintenance items and the TT bearings are currently on the top of my list. I have the tube and transmission out ( wanted to make sure that the sound was coming from this area first before ordering parts), other than the super bearings , any good sources for the regular bearings for the 25mm shaft that folks seem happy with? Thanks in advance for the help.

 

Roger at 928s'r'us has everything you'll need. Also, while you have all that out, be sure to replace the front and rear linkage bushings. Those are a pain in the a$$ to replace with the torque tube in the car.

 

The stock TT bearings are off the shelf $20 items sold by any local bearing store.

 

Yea, good point. I'll just swing on down to my local bearing store, situated right between Costco and McDonalds!

 

Actually the stock bearings are steel shielded 6006 with a C5 clearance designator. This is imporant since the ball bearings will enlarge a bit from heat soak and start galling the races.

Most people are using lesser grade bearings with C3 or less clearance. Not good for longevity.

 

OP, just get the Black Sea Super Bearings, that's what I'm getting when it's time:

http://www.blackseard.com/site/index...ducts&Itemid=3

 

Thanks, I will give him a call as I looked on his site before posting here and didn't see any listed.

 

What UNEEKONE said! Just replaced shift bushings with TT in the car, and my arms and hands still hurt days later. Would be super simple with the assembly on the floor.

 

Let's say that Roger's parts biz is not at all web-centric. Phone and/or e-mail works the best in my experience.

Our cherished 928 parts vendors add value by making sure you get exactly the right parts for each project. For instance, your torque tube is out and you plan on replacing the bearings. You'll be interested in the shims that hold the shaft centered in the bearings for instance. Your auto gearbox car (if that's what you have...) will appreciate new torque converter bearings while the trans is out. You'll want new crush washers for the transmission cooler lines. You'll want to remove the trans cooler lines so you can replace the rubber sections before they go back up above the tube. The transmission mounts almost undoubtedly have collapsed if they are original, so a pair of those would be good in your care package. You'll want the service kit for the transmission, the seal for the reservoir, and quite possibly want to do a little PM with spring and piston kit while it's all so easy to access. CV joint boots. Rear wheel bearings if yours are original, while the suspension and axles are on the floor. It's a long and distinguished list, and I'm just getting started...

I'd phone or email Roger for everything at once, rather than having to wait for pieces as you discover each need one by one during the project. Saves on frustration, shipping costs, and in the end your sanity.

 

Thanks Dr Bob for the list, thankfully my car is a 5 speed. I have a 964 C2 coupe and a 914 currently so I am familiar with the rabbit hole that comes with " while you are in there". Thankfully the shifter couplings are new on both ends, it seems that the PO had them done with the TT still in the car based on the markings all over the upper trans tunnel. My plan with this car is to knock out the deferred maintenance items ( these bearings and the timing belt,WP....) and fix some of the other little things and see where I stand in the spring. I don't really have the space to hold all three of these cars here in the long term so the game of musical chairs is going to happen at some point. The question of why did I buy a car that I don't really have room for, well , I am only human.

 

Bearing store/supplier/shop whatever you want to call it they'll have it for $20 for brand name bearings. These are off the shelf items unless you want to go the exotic route and get the ones from Constantine. I've replaced a set and the car was pretty much daily driven for the last 7 years, the replacement bearings are still quiet. The ones that Porsche used were not exotic ones either and they lasted for decades. Heat soaking might be an issue if you just came off a 150mph run in the middle of the Shara and you hit a traffic jam.

 

Point is, why don't you actually be helpful instead of your typical sarcastic self? Post part numbers, examples of bearing supply companies etc...

You make it sound like I can walk into Granger and say: "Hello, I have a Porsche 928, can you please sell me torque tube bearings?" Fleet Farm sells a tone of different bearings locally, last time I checked they don't have a Porsche cross reference chart handy.

Most people like to have the parts before they start disassembly. I'm sure most people with half a brain are aware bearings can be sourced from places other than Roger, Mark etc... but being able to send an e-mail to Mark or Roger, the next day the proper bearing shows up in the mailbox, convenience is worth something to most people.

Maybe, maybe not. A lot has changed in the bearing manufacturing world in the last 30+ years. People I know who's day jobs rely on quality bearings (like Turbo Todd) are very careful with the sources of their bearings.

On top of that counterfeit SKF and other brands floating around..... why risk it? Stick with a known source like Mark & Roger

So I shouldn't worry about my track car, just toss in any old bearing that fits?

 

Yea, I think I'd rather use a quality bearing for that application, as opposed to some Ace Hardware bearing in a 996 IMS like some other person did.

 

Sarcastic? Here is what you and everyone can do. Take the bearing with you and have the bearing supplier match it. I've opted for ones with rubber seals instead of the metal dust shields to keep them sealed a little better. No, I didn't write down the part number, figured people are intelligent enough to figure this out and don't need to be spoon fed every single step if they are doing their own TT rebuild. That's what I did and that's what anyone else should do if they want to replace the factory bearing. If you are not capable to do things on your own without step by step instructions then perhaps forking out $1000 for a TT tube rebuilt by Constantine is a better choice. Since the bearings are standard/off the shelf parts, the most you might wait is a day but the places I use had them in stock and so will other places too. There isn't much advantage getting them before they are out anyways in case the carriers get wrecked or something else happens to them that changes the course of the TT rebuild.

By the way, you can do the same thing when the wiper motor bearings go too. They are off the shelf under $10 bearings.

 

Some passive aggressive comment. At least I tried it in my OWN engine and shared the results. Failure is part of experimenting, this was clearly stated in my 996 engine repair thread. The next IMS bearing in the same engine is going to be something different but still going to be an experiment. Whatever happens will be shared. That's what gearheads do.