2000S IMS confusion

[since95]

Sorry in advance for bringing this up again, but completely confused with info vs what I found in my car.

Info I'm finding states the 2000 could be either dual row or single row. Pulled tranny got to bearing, number on bearing is a NSK 6204DUA17. According to research the 6204 bearing is single row, but depth dimension is 14mm, I measured from the face of the bearing to the part of the center stud pressed into the inner race and I get 20mm... which is close to dimension of double row. My cover is the single o ring seal type with no part number markings on it. I haven't pulled the bearing at this point, don't want it removed and loose while I am ordering replacement.

Anyone help with what type of bearing I have?

I went in due to a pretty good oil leak. Clutch was just starting to kiss the rivets, so I am replacing clutch & all peripherals, flywheel, RMS, and IMS. Car has 97k miles on it & I have no service records. Oil was clean of any kind of debris and motor runs fine, so just piece of mind replacement. Wondering if this is original IMSB.

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[JFP in PA]

It looks like a dual row. As you have the IMS flange cover off, look to see if there is a snap ring between the flange cover and the bearing; if there is, it is a single row. If there is no snap ring, it is a dual row, which uses an internal wire retainer.

[since95]

Originally Posted by JFP in PA

It looks like a dual row. As you have the IMS flange cover off, look to see if there is a snap ring between the flange cover and the bearing; if there is, it is a single row. If there is no snap ring, it is a dual row, which uses an internal wire retainer.

No snap ring! Thanks for the help.

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[BirdDog]

Just to help confirm, that part number (6204DUA17) looks the same as the dual row shown in the first message of this thread...

My IMSB - Story & Pic's

[since95]

Bearing was a dual row. I replaced it this past weekend with LN retrofit. Bearing that came out was still in pristine condition, both seals intact, no play, and based on the style of bearing looks to be the factory original, so not bad for 97k miles. Rear main seal went in super easy. Thanks to everyone on the forum who has posted in the past, made both jobs super easy. They were reasonably straightforward for someone who has done some bearing replacements in the past, but always easier when you know what to expect. Built my own cam lock/removal/install/rms tools, but I have precision lathe and mill, so I was able to make them out of extra stock I had around. Still have to install the flywheel/clutch/transmission just waiting on some micro-encapsulated bolts. Winter in New England, so may as well just wait, not doing donuts in the snow with the Porsche, my truck however might be a different story.

[thom4782]

If you still have the old bearing, remove a seal and see if there’s grease on the inside. That will indicate what it’s future would look like

No grease = no future

[Tweedboru]

The number on the seal is not the bearing number, look for the number stamped on the steel rim of the bearing.
the double row ball bearing number is NSK W5204 dims are 20 dia x 47 dia x 23.8 wide
I replaced mine which was in good condition,seals still in place full of oil ,no grease.
I removed the seals in the new bearing to rely on engine oil, 6000km later no problems.
Hope this helps

[356Guy]

Originally Posted by thom4782

If you still have the old bearing, remove a seal and see if there’s grease on the inside. That will indicate what it’s future would look like

I just did this. The balls were in nice shape but no grease to be found.

[pidj]

So you have to pull the tranny cover off and remove the bearing before knowing what to order from LN?

[skypig#232]

In short, you have to take it apart to know for sure what you have. The transmission has to come out to know for sure. If it has a deep dish IMS cover it’s single row if it’s shallow it’s dual row. Pat