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).
Endurance test report on Phantom III bottom tappet wear for unit no. 5.
| Identifier | ExFiles\Box 96\2\ scan0262 | |
| Date | 2nd November 1937 | |
| File 354 PHANTOM III BOTTOM TAPPET WEAR 29.6.34 to 2.11.37. UNIT NO. 5. (1) 1 hours endurance. Plated tappets. Working as auto tappets. | No. | Thickness of plating. | Treatment. | Condition of Tappets. | |------|-----------------------|-------------------|---------------------------------------------------------------------------------------| | 1.B | .0005 | Polished only. | Slight groove and scratched surface | | 2 " | " | " | Bad | | 3 " | " | " | As 1.B | | 4 " | " | " | " " | | 6 " | " | " | As 2.B | | 1.A | .004 | Ground to clear | Very slight groove, good surface & free from scratches, but plating peeling at edges. | | 3.A | " | " | As 1.A. | | 6.A | " | " | As 1.A. but peeling very bad. | | 4.A | " | " | As 1.A. | | 5.A | " | " | As 6.A. | These tappets removed after further 7 hours endurance, and found to be in similar condition. (2) Condition of standard SZN bottom tappets, after 39 1/2 hrs. running, both light and full throttle:- Deeply grooved, with a badly scored surface, without exception. (3) Condition of roller tappets after 1 hr. 45 mins. running:- Rollers badly worn, and camshaft heating up. | ||