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 setting and checking the thermostat unit for the 'M' Series Bentley.
| Identifier | ExFiles\Box 156\1\ scan0340 | |
| Date | 8th December 1937 | |
| To RHC.{R. H. Coverley - Production Engineer} from Rm{William Robotham - Chief Engineer}/Std. c. Da.{Bernard Day - Chassis Design} c. By.{R.W. Bailey - Chief Engineer} c. Roy.{Sir Henry Royce} THERMOSTAT SCHEME FOR 'M' SERIES BENTLEY. This scheme which is Lec.3488 with certain modifications, has now been finally instructed. We give you herewith a description of the necessary setting and checking of the thermostat unit. The thermostat unit to EB.3509 will come in from the makers having been set in a master casing with a master valve. This unit will require no setting and should require no checking for opening temperature etc. Referring to print Lec.3488 attached however, it will be necessary to set the valve guide EB.622 so that when the bellows top plate is in contact with the casing guide boss (marked 'A' in print) the bypass valve EB.3507 is as near as possible in contact with the valve guide EB.622, so cutting off bypass flow. This adjustment is made by means of adjusting washers EB.675/6/7/8/9 of varying thickness and can be carried out thus - The guide (EB.622) is screwed tightly into the casing (EB.619) with the minimum thickness of washer (EB.675) underneath it, and the thermostat (EB.3509) is inserted into the casing and raised until the bypass valve (EB.3507) is touching the valve guide (EB.622). The clearance between the bellows top plate and the casing guide boss ('A' on attached print) should then be measured accurately by means of feelers and washers equal to this clearance (or .001 or .002 more but in no case less than this dimension) should be inserted under the valve guide seating (EB.622) and the latter tightened up in position. The thermostat casing unit is then assembled by inserting the thermostat unit (EB.3509) into the casing (EB.619) fitting cover (EB.621), tightening up nut (K.4322) which secures thermostat unit, (EB.3509) to the cover (EB.621), and fitting top valve (EB.680) nut (EB.681) and looking wire K.20185 to spindle of thermostat unit. | ||