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).
Condition report on engine tappets after running tests.
| Identifier | ExFiles\Box 96\2\ scan0266 | |
| Date | 2nd November 1937 guessed | |
| -5- Fescolised tappets in No.5 block. Cast Iron tappets in Nos. 2 and 4 blocks. Condition of these after 8 hrs. 30 mins. running:- Cast iron tappets in good condition, very slightly grooved, and a good surface. Fescolised tappets in good condition. These tappets refitted, with exception of No.1 block. This with standard SZN tappets and run with clearance .004" inlet and .008" exhaust. Nos. 3 and 6 blocks with original standard tappets. All tappets other than No.1 Block, running as auto tappets. Condition after 3 hrs. at 4000 r.p.m. and 1 hr. at 4250 | No. | Type. | Condition. | No. | Type. | Condition. | |-------|-------------|----------------------------------------------|-------|-------------|--------------------------------------------------------| | A.1 | New Std. SZN| Very good surface. No groove. | B.1 | New std. SZN| Lightly scratched. Groove .025 wide. | | A.2 | " | ditto | B.2 | " | Lightly scratched. No groove. | | A.3 | Cast iron | Chipping on edges. Good surface .050 groove | B.3 | Cast iron | Good surface. Slightly chipped. Groove .025 wide | | A.4 | " | ditto | B.4 | " | ditto | | A.5 | Std.SZN | Bad groove .125 wide. Scratched surface. | B.5 | Std.SZN | Slightly scratched. Groove .075 wide. | | A.6 | " | ditto | B.6 | " | Slightly scratched. Groove .100 wide. | | A.7 | Cast iron | Good surface groove .075 wide | B.7 | Cast iron | Good surface. Groove .025 wide. | | A.8 | " | Good surface groove .050 wide | B.8 | " | Good surface. Chipping. 3 flats .025 wide. | | A.9 | Fescolised. | Good surface. groove .025 wide. | B.9 | Fescolised | Good surface. No groove | | A.10 | " | ditto | B.10 | " | ditto | | A.11 | Std.SZN. | Scratched surface. Bad groove .100 wide | B.11 | Std.SZN | Scratched surface. Groove .075 wide. | | A.12 | " | Good surface. Bad groove .100 wide | B.12 | " | Scratched surface. Groove .025 wide. | The cams with cast iron tappets badly worn. | ||