I have no knowledge here other than being a mechanic. The broken bolts have all failed with a line radiating out from the center which would indicate to me fatigue from the gear being loose and causing failure due to repeated shock loadings, in a rotational direction.
I have seen a Continental engine conrod that had the flats that the conrod bolt head sat against and it was not machined square. This would have led to a conrod bolt failure. There can be many reasons for failure. One of them can be faulty new parts.
I guess I'm about to be educated
Btw. Allen screws / bolts are usually grade 12..... and forged. Machined threads on bolts are usually in the realm of junk bolts.
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Bluebell
Carrier Armoured O.P. No1 Mk3 W. T84991
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6.
Dodge WC55. 37mm Gun Motor Carriage M6
Jeep Mb #135668
So many questions....
Last edited by Lynn Eades; 20-12-20 at 10:29.
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