From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Procedures for addressing different types of big end failure in engines.
| Identifier | ExFiles\Box 115\3\ scan0010 | |
| Date | 3rd July 1937 guessed | |
| -2- (a) Big end failure in cases where the main bearings are a good job without slackness or hammering out. Modify the lubrication holes in the crankshaft in accordance with (a) and (b) of paragraph (1) of this memo. Renewal of failed big ends and attention to liners in accordance with the Depot Sheet Hd.{Mr Hayward/Mr Huddy}333 paragraph 2 & 4. Fit large oil pump. (b) Big end failure in cases where the main bearings have hammered out and not had the first 'take-up'. Main bearings to be taken up by liner stepping. Attention to big ends as (a). Fit large oil pump. (c) Big end failures in cases where the unit has had the main bearings taken up once and are again hammered out. New A.C.2. main bearings and modified lubrication of crankshaft as paragraph (1) of this memo. Attention to big ends as (a). (d) Where the extra lubrication hole is drilled in the crankpins, the oil jet hole in the side of the connecting rods should be blanked off. Ordinary blanking by soldering is not satisfactory. The best way is by knocking in small taper pins and peening the rod, finally soldering over. | ||