IMS Fix

[Gelbster]

Originally Posted by WorkInProgressK

I would have kept it sealed with grease. In the end, all of the "lubrification in the bearing" is mostly used as corrosion protection and cooling. Splash will work fine. Bearings deteriorate when they pit so when people stop driving their car. .

Really ?
How will splash help a bearing that is sealed ?The cumulative wisdom of the IMSB world is the outer seal was the cause of much of he problem. Ditto the mainshaft and pinion bearing in the G86 that you allude to.
I ask because of the Hippocratic oath we should take when giving advice. "First,do no harm". If you have enough evidence to refute the cummulative wisdom of the experts, we're all ears & eyeballs.

[WorkInProgressK]

Originally Posted by Gelbster

Really ?
How will splash help a bearing that is sealed ?The cumulative wisdom of the IMSB world is the outer seal was the cause of much of he problem. Ditto the mainshaft and pinion bearing in the G86 that you allude to.
I ask because of the Hippocratic oath we should take when giving advice. "First,do no harm". If you have enough evidence to refute the cummulative wisdom of the experts, we're all ears & eyeballs.

I was stating"either or" no seal with splash or seal with grease. These bearings are called "anti-friction bearing" and yes the cumulative wisdom is just fear mongering and people are making money on this. The real issue is people not using their cars causing their bearing to pit from corrosion. Without pitting the bearing would not wear in the cars useful life.
Out of the machinery's Handbook or bible to most Machinist and Mechanical Engineers.


Picture of pitting, from google search.


Here is some reference, maybe I should charge for doing some research on the subject? Btw I have owned my "porsche" for 1 year now so new to this fear, but my hobbies and daily job allow me to analyse it a little further.

[356Guy]

Well its either one or the other....grease lube or splash oil lube. Sealed grease lube bearings with some oil contamination is not a normal lubrication method. The problem is compounded when you are using contaminated oil due to infrequent oil changes, short driving trips, etc.

[JFP in PA]

Originally Posted by WorkInProgressK

I was stating"either or" no seal with splash or seal with grease. These bearings are called "anti-friction bearing" and yes the cumulative wisdom is just fear mongering and people are making money on this. The real issue is people not using their cars causing their bearing to pit from corrosion. Without pitting the bearing would not wear in the cars useful life.
Out of the machinery's Handbook or bible to most Machinist and Mechanical Engineers.


Picture of pitting, from google search.


Here is some reference, maybe I should charge for doing some research on the subject? Btw I have owned my "porsche" for 1 year now so new to this fear, but my hobbies and daily job allow me to analyse it a little further.

Which does nothing to explain why cars that are daily drivers, and driven hard, were some of the first to show the problem.

[WorkInProgressK]

Originally Posted by JFP in PA

Which does nothing to explain why cars that are daily drivers, and driven hard, were some of the first to show the problem.

I don't believe that is correct. Everything I read on the subject its people who didn't drive the cars hard that had the problem occur to them.

The book is from 2004. So those who made the boxster had access to it:P.


Oh I love that plug idea. Cheapest solution out there. Only thing is to put a pin hole to allow pressures to balance preventing the plug to pop out if the situation allowing it arise.

https://documents.mrosupply.com/product_documents/10/100KSF/lubrication.pdf

A more recent document I found on the World Wide Web.

[JFP in PA]

Originally Posted by WorkInProgressK

I don't believe that is correct. Everything I read on the subject its people who didn't drive the cars hard that had the problem occur to them.

The first cars to suffer IMS failures were daily drivers still under warranty.

Well we just pulled a dual row IMS out of a 2001 986, one owner car with just under 11,000 miles on it, or about 700 miles a year. The bearing (balls, races, and cages) was absolutely pristine and without any signs of pitting or other wear, after being basically parked for 16 years. And this is only one of dozens we have seen this way.

Sorry, but there is a problem with your theory............

IMS failure is much more complicated that just having one simple cause.

[JFP in PA]

Originally Posted by WorkInProgressK

Oh I love that plug idea. Cheapest solution out there. Only thing is to put a pin hole to allow pressures to balance preventing the plug to pop out if the situation allowing it arise.

It is totally unnecessary, as well as counter productive, to put a hole in shaft plug such as the IMS Solution uses; the other end (oil pump side) vents the tube.

[WorkInProgressK]

Originally Posted by JFP in PA

IMS failure is much more complicated that just having one simple cause.

Obviously, but the longer time goes by the more one failure method start showing. The first ones could have been related to production and being under designed(single vs dual row). Now its lubrication and corrosion. You say you guys removed a pristine bearing, did you test the bearing under load? What if it had pitting that couldn't be seen with the naked eye? Or the owner changed the oil every 6 months regardless of mileage. You are right about causes, but ownership's have a lot to do with the state of the car.

Originally Posted by JFP in PA

It is totally unnecessary, as well as counter productive, to put a hole in shaft plug such as the IMS Solution uses; the other end (oil pump side) vents the tube.

Isn't the pump side sealed? That's why there is a proposed solution to drill a little hole to allow oil to sneak past pushing everything towards the Aft IMS bearing?

JFP, I know you have a lot of knowledge and may be making a living maintaining these cars. I am just seeing this ownership as a nice car with nice dynamics that is overrun by fear, because it's a "premium vehicle" with premium cost. Finding cheap effective solution is my job and I like sharing my mechanical knowledge.

I don't mind having a problem with a theory, given the chance and money anything can become a fact. At the moment, that isn't a possibility.