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YOUR RESEARCHOh no, not another IMS thread..but...
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Check i have never seen one
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I bet yours had oil in it, not grease - in the over 100 I have checked I have never seen one with grease in it - how long will that last...depends on the oil, the contaminants, the amount of use, the flow of new oil (thru thermal transfer) and the eventual filling of the tube to the point no new oil can get in and the old oil just "cooks" in there turning nasty black
Leading evidence: 'Check i have never seen one' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check i have never seen one' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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It's lubricated with engine oil and allowed to drain back out.
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I bet yours had oil in it, not grease - in the over 100 I have checked I have never seen one with grease in it - how long will that last...depends on the oil, the contaminants, the amount of use, the flow of new oil (thru thermal transfer) and the eventual filling of the tube to the point no new oil can get in and the old oil just "cooks" in there turning nasty black
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Suggestion
I would bet that large changes in temperature "can" change the pressure in the tube to the point that even a "full tube" can get new oil in (hence the drive it like you stole it mentality)
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there is oil inside..to remove one seal use a metal "pick" and poke a hole in it then just pull it off...
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Check i have never seen one
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I bet yours had oil in it, not grease - in the over 100 I have checked I have never seen one with grease in it - how long will that last...depends on the oil, the contaminants, the amount of use, the flow of new oil (thru thermal transfer) and the eventual filling of the tube to the point no new oil can get in and the old oil just "cooks" in there turning nasty black
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Suggestion
I bet yours had oil in it, not grease - in the over 100 I have checked I have never seen one with grease in it - how long will that last...depends on the oil, the contaminants, the amount of use, the flow of new oil (thru thermal transfer) and the eventual filling of the tube to the point no new oil can get in and the old oil just "cooks" in there turning nasty black
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Suggestion
I would bet that large changes in temperature "can" change the pressure in the tube to the point that even a "full tube" can get new oil in (hence the drive it like you stole it mentality)
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FWIW that bearing will leak oil out for a LONG time...pull one of the seals off and wash it with DAWN dishwashing soap and hot water...then it will be clean and free moving and wont leave a wet spot on your desk
there is oil inside..to remove one seal use a metal "pick" and poke a hole in it then just pull it off...
I would suggest the rear seal (head of center bolt) so the front is still on (side that faces UP) when displayed
once clean you will be able to look at the ball and race surfaces....under minimal magnification you would see any pitting that might be the starts of wear - sometimes they are very shiny, sometimes scratched, sometimes lightly pitted (etched) like a chemical ate the surface -
if it was horrific you would know right away, but most are not - they are somewhere along their life span
I took both seals off.
Now I have a little better understanding. Broken seal wouldn't necessarily cause an immediate failure. My seals were in great shape and even though I can barely see the *****, they look to be in good shape.
But I can't imagine the plastic seals would provide a "closed system" and prevent oil from entering the bearing.
I don't know the pathology and the cascade of how failure occurs but I guess integrity of the seal could have been better. Does LN Bearing have a different type of seal?
sorry guys.....but I still enjoy the topic
the seal IMO is part of the issue, the bearing comes with grease...then is installed in a "sealed tube" the tube has air and maybe a little oil...the air (gasses) in the tube expand with temperature and are forcedout thru that seal... when temps drop (cool down) there is a "low pressure" condition in the tube that is then equalized by air (and in this case OIL) being pulled into the tube, the oil coming in washes out the grease from the bearing and leaves contaminated oil in the bearing (which if left to sit over long periods of time causes chemical etching if the oil is contaminated enough with fuel and hydrocarbons) - where was I....OH the tube then has oil in it (which we often see when pulling the IMS bearing out, sometime VERY FULL!) and the bearing which was designed to run in grease is now running in oil
there comes a point when hydrolic pressure from the oil increases over what was air pressure from the air...I cant think that far ahead...but I am sure this happens
lastly the "seal" now is used to prevent new oil coming in as the tube is "full" of oil and just runs in the same old oil and old oil from exiting the tube
I bet yours had oil in it, not grease - in the over 100 I have checked I have never seen one with grease in it - how long will that last...depends on the oil, the contaminants, the amount of use, the flow of new oil (thru thermal transfer) and the eventual filling of the tube to the point no new oil can get in and the old oil just "cooks" in there turning nasty black
I would bet that large changes in temperature "can" change the pressure in the tube to the point that even a "full tube" can get new oil in (hence the drive it like you stole it mentality)
LNE bearing is not sealed, allows fresh oil in and out but thru a "splash" rather than a pressure
again, sorry guys -
for the record - this is an "educated guess" based on my limited knowledge of how things work and some practical thinking and collaborating
my "fix" had I worked at Porsche would be a small hole drilled in the tube....
that's IT!
the grease would stay in the bearing and work fine, maybe beef up the bolt a little so it doesnt break off...i would have fixed this for $0.05 at the factory - THAT is how awesome I am
and now for my next trick i will do a triple back flip on a motorcycle over a pit of snakes on fire
2002 Tiptronic with 51,900 miles. No oil leak. I plan on keeping the car another 5 years and I want to drive it without having to worry about the bearing going out.
I just had mine done earlier this month with the LN Retrofit, for the same reasons as you Rxjohn.
This included logging 1400 miles roundtrip to the Tail of the Dragon a couple weeks ago. Made the trip much more enjoyable!
In case this wasn't answered, the LN bearings have no seals - so nothing can get trapped in the bearing. It's lubricated with engine oil and allowed to drain back out. Also, re bearings, the ***** are harder than the races - so look for wear on the races, not the *****.
