Quote:
Originally Posted by brjak
Am i missing something? the dual row/early boxsters have a less than 1% failure rate. With an 8% for single row IMS.
If someone came to you and said you have a 99+% chance nothing will go wrong, would you not save your money? and spend elsewhere?
Sorry, if I am alone feeling this way, but other items in the car probably have a higher failure rate. Yes everything will fail eventually.
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1. that figure is wrong in that an unknown number of failures were left out.
(I never rely on incomplete data, aka the Enron rule)
2. an actual figure that is accurate is impossible to nail down.
The IMSB failure rate is like guessing heads or tails based on the last 20 flips.
What the others experience has nothing to do with the current condition of
your factory original IMSB.
An IMSB that was once 1% can jump to 70% due to host of maintenance and driving variables that changed abruptly. When those figures you cite were calculated the single row bearing fleet was still relatively low mileage as group. The IMSB is not a static issue. Every 2nd, 3rd, 4th and possibly 5th owner maintained potentially different driving and maintenance habits. As the cars get cheaper less attention is given to the cars. Why is this relevant? Because a sealed bearing with no direct oil feeding it is on a timer. That timer speeds up if oil starvation or contamination is not mitigated during mileage intervals that are too long for the quality of oil used.
This is probably the simplest of all the possible engine failures to avoid. Or maybe replacing the water pump every 4-5 years. But the former can only be done when the trans is down which makes doing it a no-brainer.
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