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17 April, 06:35

Technician A says powdered metal rods can be resized just like a regular rod. Technician B says powdered metal rods can be resized if bearings of a larger diameter are available for that particular engine. Who is correct?

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  1. 17 April, 07:30
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    Technician B is correct

    Explanation:

    To resize a connecting rod's big end, the bolts are removed and the cap and rod mating surfaces will be ground to an approximate measurement. Thereafter, the rod cap will be bolted back onto the rod while the bore is machined back to it's proper size. However, the challenge with powdered metal rods is that due to the fact that the fractured surface is critical to their alignment, they cannot tolerate having those surfaces ground smooth. Hence, they cannot be resized, except bearing inserts of larger diameters are available for that particular engine.

    Thus, technician B is correct.
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