30-10-2020, 09:16 PM
The bolts are comparatively large for the light components, short stroke and modest revs. Much larger and high revving engines survive on 5/16.
Probably the main threat to fatigue failure is stretched bolts and frequent repeat tightening to a high stress, as when scraping bearings.
Torsion wrenches were almost unknown pre war.
For an ordinary 45 ton HT bolt 15 lbs/ft is recommended, adequate for a non racer.
Probably the main threat to fatigue failure is stretched bolts and frequent repeat tightening to a high stress, as when scraping bearings.
Torsion wrenches were almost unknown pre war.
For an ordinary 45 ton HT bolt 15 lbs/ft is recommended, adequate for a non racer.