Quote:
Originally Posted by elgyqc
I don't get it either, but reading on this and other forums it is often said that IMSB problems happen more often in M96 engines that have not been driven a lot and not driven hard. Is there data to back this up? I don't know.
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One possible explanation might be that the oil that gets trapped inside the IMS and hence in the bearing is overused and dirty as it`s not replaced with the oil changes. Also, the gas that seeps through the bearing during cooling-warm up cycles is crankcase gas, which contains CO2 and other potentially corrosive chemicals coming from burnt gas and oil. Now, if you leave your car unused for years, the bearing sits half way submerged in this dirty oil inside the tube. Being half way exposed to the oil for years may cause an uneven wear pattern which might lead to future failure?
This is just a theory that I just came up with, don`t take it for granted
But for this reason I added a "drain hole" to the IMS where the trapped oil can escape.
An additional note: my car had 100k miles and spent 11 years in a garage with the engine seized. The IMSB was original and in a perfect shape. But the oil it was sitting in was black and dirty.