Using Durametric to Detect IMS Bearing Weakness

[papasmurf]

as if the values are fluctuating. If the numbers are not changing then I think you are okay.

[The Radium King]

i've seen both +/- 4 and +/- 6 stated as acceptable limits. watching the numbers with your durametric will tell you two things:

- fluctuating values tell you your ims is wobbling.
- values that slowly increase over time (months, years) speak to deteriorating tensioner paddles (bits of green plastic in your oil filter) and need for eventual rebuild (3.6!!!).
- values that start high are probably due to mis-calibrated sensors from the factory.

[jaykay]

okay great.....thanks guys

I guess 4 degrees is nothing when you are dealing with chain lash!

[navyc130fe]

I have a deviation of 2.0 and -6.0. I'm guessing this is bad.....?? Should I flatbead it to my mechanic??? What say you Boxster Gods???

[JFP in PA]

Originally Posted by navyc130fe

I have a deviation of 2.0 and -6.0. I'm guessing this is bad.....?? Should I flatbead it to my mechanic??? What say you Boxster Gods???

Don't panic just yet; if the values are steady (not swinging back and forth and idle), it is probably just wear on one of the tensioners, chain paddles, or a VarioCam unit. These are problems that can be addressed when time and funds permit.

If the deviation values are swinging wildly, shut the car off and call the flatbed.....

[jaykay]

There is mode that can plot the deviation in real time as you idle. As far as I recall you call up cam one and cam two. The display seemed accurate enough to show variance in deviation; you should have flat lines for both parameters. There is also a numerical display that can keep your eye on

[navyc130fe]

They were rock steady at idle. No deviation at all, let run for 5 minutes. I am still contemplating the IMS/RMS upgrade as a precaution. I have a mechanic (Provost Motorsports) who runs a $2k special to replace. Any idea on the price of the tensioners, etc.?? Thanks for the replies!

[JFP in PA]

Originally Posted by The Radium King

i've seen both +/- 4 and +/- 6 stated as acceptable limits.

The OEM spec has been both +/- 4 (early M96) and +/- 6 (later M96/97).