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Old 04-06-2017, 01:58 PM   #1
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Originally Posted by truegearhead View Post
I replaced my IMS with an upgraded unit a few years ago and just pulled everything back apart to replace a new IMS oil leak. I can see where the IMS oil seal failed. My question is where is this oil coming from? Is it passing through the bearing? It's a huge leak. I'm going to replace the bearing again due some metal shavings I found around the housing. The bearing still "feels ok" but it's obviously time for it to go. With as much oil is there was in the housing it really seems like a unsealed bearing would be the way to go.

Bonus question, I searched and searched yesterday but even with all the RMS depth talk out there I can't find a picture of one that is confirmed to be at the right depth. I don't have the tool. I seated mine 2mm past the housing face.
The oil is coming from splash oil in the crankcase.

The only sealing the bearing is meant to do is seal the grease inside the bearing. The bearing is not an oil seal except to the inside of the IMS tube, and that is one of the big problems with the bearing set up. Oil can get past the bearing and cook in the tube. This creates an acidic slime that can eat the IMS bearing. The bearing does not seal oil to the outside of the engine. There should be an O ring on the bolt to do that. If it is leaking lots of oil, the O ring on the bolt may be missing.

The bearing you show is not a full contact seal bearing, I'll hazard a guess it's the Pelican replacement looking at it. I bought the Pelican kit for the better bolt, and replaced the bearing with a full contact 6204 steel bearing with high temp grease and Viton seals ($6.00). I didn't catch if your engine was originally single or dual row. If dual row I'd suggest a dual row bearing.

If you have metal in the oil, your situation does not lend itself to an open bearing. Metal particles in a bearing will lead to premature bearing failure.

If it were me, I'd source a full face contact steel bearing and plan on replacing it next clutch job. If this is a case of a dual row bearing being replaced with a single row and a spacer, I'd get a new dual row full contact. I'd also replace the rear main seal. In my view leaving in a worn seal is not finishing the job.

Some folks would agree with this approach, others not. In the end it's up to you. One thing I think everyone would agree on is if it is a dual row replaced with a single row and a spacer, at a minimum go back with a dual row. Best of luck on whatever you decide.

My 2 cents
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Old 04-07-2017, 04:08 AM   #2
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[QUOTE=JWhen you buy a bearing made of the same materials as the ones that were originally failing, why would you expect different results?[/QUOTE]

I agree, I'm not disappointed in the fact that it failed though, I'm disappointed there's no way to remove it.

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The oil is coming from splash oil in the crankcase....

Oddly no, I cleaned off the lip just past the bearing and drained all the oil out of the car. Over night oil leaked back out of the bearing and filled that space shown in the photo. Its either oil that was in the bearing or oil that was in the tube and leaked back through the bearing.

QUESTION: Does anyone know what threads are on the revised Pelican IMS bearing shaft? I need to order some parts to make this tool. Thanks


Happy Friday guys


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Old 04-07-2017, 04:42 AM   #3
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Originally Posted by truegearhead View Post
I agree, I'm not disappointed in the fact that it failed though, I'm disappointed there's no way to remove it.




Oddly no, I cleaned off the lip just past the bearing and drained all the oil out of the car. Over night oil leaked back out of the bearing and filled that space shown in the photo. Its either oil that was in the bearing or oil that was in the tube and leaked back through the bearing.

QUESTION: Does anyone know what threads are on the revised Pelican IMS bearing shaft? I need to order some parts to make this tool. Thanks


Happy Friday guys


.
Contact LN Engineering, they produce Pelican's low priced kits for them and should know what size the stud is. Most likely, their supplemental IMS tool kit has the correct adaptor in it, but you should ask them that question as well.
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Old 04-07-2017, 05:30 AM   #4
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Contact LN Engineering, they produce Pelican's low priced kits for them and should know what size the stud is. Most likely, their supplemental IMS tool kit has the correct adaptor in it, but you should ask them that question as well.
Good call! I just gave LN a ring and they are sending me an adapter free of charge! Those guys rock!
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Old 04-07-2017, 07:16 AM   #5
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Amazing service to the Porsche Community by LN Engineering.
This was Not their customer, it was not their problem. Truegear probably never bought anything from them. But they gave him a valuable part anyway. Outstanding.
Hopefully this standard of performance is remembered by the Peanut Gallery who so delight in disparaging LN and others.
A happy conclusion for all would be to read that an LN IMSB was eventually fitted as a replacement for the failed Pelican part. Great story, thanks for sharing with us.

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Good call! I just gave LN a ring and they are sending me an adapter free of charge! Those guys rock!
RS Roller Bearing IMS retrofit kits - RND Store LN Engineering
IMS - Products LN Engineering
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