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).
Instructions for adjusting the clutch bleeder valve and checking for clutch slippage.
| Identifier | ExFiles\Box 128\2\ scan0132 | |
| Date | 14th April 1932 guessed | |
| the button down make a normal start with the accelerator. If the clutch grabs or the engine speeds up too much before the clutch engages, check the length of the bleeder valve by measuring from the centre of the pin to the front face of the plunger. (See Fig.43). This distance should be 1 to 1.1/16 in. If incorrect, adjust the valve and recheck by again starting in low gear. Shorten the bleeder valve if the clutch grabs or lengthens it if the engine speeds up too much before the clutch engages. This is a very fine adjustment and should be made by giving the bleeder valve one half turn at a time. If it seems necessary to go outside of the 1.1/16 in. measurement look for other troubles. After a good low speed start is obtained, check by "free wheeling" at 25 M.P.H. and then opening the accelerator normally. There must be no more than normal clutch slippage under these conditions. If the clutch slips too much, it will probably be necessary to lengthen the bleeder valve but care must be used not to lengthen it enough to bring its length very far outside of the 1.1/16 in. limit. | ||