911-997

excuse me for the noob question, is there IMS in PDK as well? I thought IMS is located in engine only! Or am I mixing two different acronyms ?

Para82

You're thinking of IMSA - it's totally different.

Is Raby going to chime in and drop some knowledge or is there a waiting list for that too ?

pfbz

part number 040117

jdgamble

My April 1 post. Just for laughs.

earossi

It appears that most of the posters think you posting of a scored IMS bearing is bogus. If it is, then have a laugh on me. Happy April fools day.

However, if you have a mechanic telling you that the IMS bearing has scoring, you need to get your car and run away! The IMS bearing is a roller bearing, so there is no such phenomena as "scoring". When the bearings fail, you will get galling before they disintegrate. Not scoring.

It's all a mute point though, since for your mechanic to "observe" anything wrong with the bearing, he would have to pull the bearing from the engine, which is a bit of work. And, if he has it lying on his workbench, another $500 will give you a new bearing.

So, were you accurate in posting what the mechanic told you? Or, is this just another April fools joke!

Para82

Does anybody have any extra wet wipes?


Seriously...

pfbz

This part isn't true even on April fools day... M96/97 IMS bearings are not roller, which is, some say, the crux of the problem. Non-oil fed ball bearings.

SpeedyD

Bore scoring is exceptionally rare in the .2 and appears correlated to cold weather starts. Think Canadian or Northern US/European winters and instances where the car is being started in very cold temps (or had a prior history of being in a cold climate getting cold weather starts).

Unless someone is starting the car in freezing weather on a regular basis I dont think this is an issue to worry about at all.

Iceter

Well, you were warned not to use PVC air lines. That's what you get.

docdrs

What was the solution before......... balsa wood is very light, I like pizza!

earossi

Semantics. Roller bearings and ball bearings do the same thing......they roll. When you talk scoring, it applies to a plain journal bearing design as in the early 911's. The early 911 engine, and the later Mezger turbo engines all used plain bearings (of which some were bearing inserts and some had the IMS run using a machined area of the engine case as a plain bearing).

My post was to warn that a mechanic that uses terminology pertinent to journal bearings, has no idea of what he is talking about. Get a new mechanic.

myw

LOLL

Type_LT