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).
Piston skirt dimensions and engine condition report for Chassis No. 8303/3.
| Identifier | ExFiles\Box 135\3\ scan0214 | |
| Date | 27th August 1937 | |
| R.P.81 S. SMITH & SONS (MOTOR ACCESSORIES) LTD., CRICKLEWOOD WORKS, LONDON, N.W.2. CONTINUATION NO -2- 27.8.37. PHILLIPS MILLS. CHASSIS NO. 8303/3 (Cont'd) PISTON SKIRT DIMENSIONS. No.1. Top of Skirt. Pin. 2.491" Bottom of Skirt. Pin. 2.495" " " Thrust. 2.495" " " Thrust. 2.495" No.2. Top of Skirt. Pin. 2.4905" Bottom of Skirt. Pin. 2.49575" " " Thrust. 2.495" " " Thrust. 2.496" No.3. Top of Skirt. Pin. 2.4905. Bottom of Skirt. Pin. 2.4955" " " Thrust. 2.4955. " " Thrust. 2.49575" No.4. Top of Skirt. Pin 2.491 Bottom of Skirt. Pin. 2.496" " " Thrust 2.495" " " Thrust. 2.497" All pistons were in good condition with the exception of the top ring grooves which have worn varying from .010 to .012". The gas rings have worn showing a gap of 3/32" when fitted to the cylinder bore. The scraper rings were partly choked with carbon resulting in a slightly higher oil consumption. All the bearings were in excellent condition with the exception of the centre main bearing (bottom half) which had cracked. With regard to the oil, a certain amount of sludge had collected in the tappet chamber and front cover, but the general condition of the interior of engine was good. The engine has covered 8,000 miles since the oil was last changed. -------- | ||