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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).
Test report on the performance of hydraulic adjusted tappets.

Identifier  ExFiles\Box 17\6\  Scan339
Date  20th March 1935
  
LP{Mr Lappin} Smith x454

Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux}28/KW.20.3.35.

28-EX

Tests Carried out with Hydraulic Adjusted Tappets.

(1) Hydraulic tappets in operation, erratic slow running below 8 m.p.h.
(2) Hydraulic adjustment cut out. Valves set to have .002 tight clearance.
(3) Erratic slow running below 8 m.p.h.
(4) Hydraulic adjustment cut out. Valves set to .003, .004 and .005. Slow running erratic until .005 setting was reached.
(5) Hydraulic tappet adjustment cut out. Valves set with a clearance of .002 tight. Car left out all night, moderately cold.
(6) Valve clearances checked before engine turned.

I E E I I E E I I E E I
2 4 5 6 10 12 Tappets just free

1 7 8 9 Tappets .002" clearance turning engine to check.

3 11 Tappets just free.

(7) Engine started up in 5 seconds, tappets quiet.
(8) Hydraulic adjustment still cut off. Valves set with .006" clearance.
(9) Slow running test. 4 m.p.h. steady running obtained, pulsation of engine felt.
(10) Hydraulic tappets dismantled and bench test taken of time and load required for leak of plunger. Oil and plunger unit kept at a constant temperature of 80°C. (see chart).
  
  


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