Quote:
Originally Posted by tlow98
Out of curiosity, why do you not recommend replacing the mains preventively @deansbimmer?
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For the reasons mentioned.
-Statistically lower number of reported failures than rod bearings.
-Mechanically lower risk of failure, they wear differently and slower.
-Split bed plate design = exceptionally high labor requirements and more involved than individual cap design like S54 which are quite easy.
It's not a "while you're in there" job. Mains require engine removal and teardown. Even at the minimum feasible job scope your total investment should still rival the cost of a replacement engine. It doesn't make financial sense.
If you found someone willing to do it cheap, it wouldn't be up to the correct standards of precision or cleanliness to provide a lasting solution. Done properly, it will always be expensive. You'd be better off leaving the factory mains in place. When it comes time to do mains, you should be at high miles and doing a complete rebuild of the engine.