14-09-2020, 09:05 PM
It is unusual for a rod significantly tight to remain that way. The purpose of running in was to melt the high spots and the surface usually shows signs of smearing if originally tight. On the other hand the oil film attains immense separating pressure.
Hardly dare ask but any chance a cap get mixed or reversed? The bolts run slack must be replaced as this is the condition which causes fatigue. (As does repeat tightening!)
If the crankpins are at all oval contact assembled only occurs with the unworn high part, which may give a different pattern than when the halves are tried separately on the sides. Slight distortion occurs when the cap is tightend, esp if the caps not perfectly filed.
Experienced persons can quickly fit rods of quite seriously different size. The main art is avoiding corrugations and keeping the rod square. (Expereinced persons can also reduce ovality of the crankpin!)
Modern practice is to maintain a running clearance which makes the final fitting somewaht blind.
It was considerd good practice to fit down the caps and lightly scape good bearings. This removes the abrasive layer of embedded dirt which eventually builds with no filter.
The oriinal Austin bolts are a very precise fit, i dunno about replacements.
Hardly dare ask but any chance a cap get mixed or reversed? The bolts run slack must be replaced as this is the condition which causes fatigue. (As does repeat tightening!)
If the crankpins are at all oval contact assembled only occurs with the unworn high part, which may give a different pattern than when the halves are tried separately on the sides. Slight distortion occurs when the cap is tightend, esp if the caps not perfectly filed.
Experienced persons can quickly fit rods of quite seriously different size. The main art is avoiding corrugations and keeping the rod square. (Expereinced persons can also reduce ovality of the crankpin!)
Modern practice is to maintain a running clearance which makes the final fitting somewaht blind.
It was considerd good practice to fit down the caps and lightly scape good bearings. This removes the abrasive layer of embedded dirt which eventually builds with no filter.
The oriinal Austin bolts are a very precise fit, i dunno about replacements.