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).
Maintenance and repair instructions for a Ford fuel pump, detailing component replacement and reassembly procedures.
| Identifier | ExFiles\Box 27a\2\ Scan226 | |
| Date | 18th July 1933 guessed | |
| FORD BULLETIN Page 37 Before dismantling the pump, a mark should be made across the edge of the upper and lower pump body flanges to facilitate correct re-assembly. If the diaphragm is punctured, or worn out, replace the complete diaphragm. Do not attempt to replace only one or two layers, but replace all four layers. If the valves are sticky, remove both inlet and outlet valve plugs, valve springs, and valves. Wash the valves in petrol, and see if they have become distorted or warped. Examine the valve seats to make certain that no irregularities exist that will prevent the valve from opening or closing properly. Replace the valves if they have become worn or warped, and re-assemble them to the pump body using new gaskets under the valve plugs. (A thin film of oil on a new valve before installing will assist in the first priming of the pump). If it is found that the outlet valve seat has become loose, it will be necessary to replace the fuel pump upper body. If it is found that fuel is leaking around the pull rod as indicated by petrol dripping out of the pump body through the vent hole in the lower body, replace the pull rod gasket, and diaphragm if necessary, re-assemble the diaphragm washer and tighten the pull rod nut securely. When re-assembling the diaphragm do not under any circumstances use an adhesive, or jointing compound. [Image of a drain plug, Fig. 45] B-9185-AR supplied for replacements. Use on either old or new type pumps. B-9185-B. Used on production. Do not use on old type pumps. B.9185-AR Plugs identified by this hole. Fig. 45. To prevent the possibility of the high vacuum developed in the pump chamber from distorting the fuel pump inlet screen, a stiffener has been incorporated in this part as shown in Fig. 46. When fuel pumps are dismantled for any reason, the condition of the original design of pump screen, where fitted, should be noted and if the condition warrants replacement, should be replaced by one of the later type strengthened screens. To prevent the possibility of oil from the crankcase being blown out of the pull rod housing in the lower body, a fuel pump oil retaining washer P-110325 and fuel pump oil retaining washer tension spring BP-13222 have been added between the lower diaphragm protector and the top of the pull rod housing as shown in Fig. 49. If a case occurs where it is necessary to fit this washer and spring in a pump not originally fitted with them, the B-9396 diaphragm spring must also be changed so that the fitting of this extra spring does not alter the fuel delivery pressure. [Image of a fuel pump, Fig. 44] 1/8" HOLE HAS BEEN ADDED AT THIS POINT USE B-9185-AR ON FUEL PUMP UPPER BODIES EITHER WITH OR WITHOUT HOLE "A" - USE B-9185-B ONLY ON FUEL PUMPS HAVING HOLE "A" - Fig. 44. [Image of pump screens, Fig. 46] Strengthened Type Screen Original Type Screen Fig. 46. A 1/8 inch hole has been added to the upper bodies of all fuel pumps as shown in Fig. 44 to permit easier draining of the sediment chamber. A modified type of drain plug B-9185-B is used in production with these drilled upper bodies as shown in Fig. 45; the B-9158-AR drain plugs only being supplied for replacements as these may be used on the fuel pump upper bodies either with or without the 1/8 inch drain hole. If the B-9158-B drain plug were installed on a fuel pump not having the 1/8 inch drain hole, it would be necessary to remove the plug completely to drain the sediment chamber. The two types of diaphragm spring may be identified by the total number of coils being 7 1/4 to 8 1/2 in the original type, and 6 to 7 coils in the later type. The fuel pump oil retaining washer tension spring BF-13222 is also used in the fender lamp sockets and has been so altered in strength as to meet the requirements of the fuel pump. Care must be taken that the original type BF-13222 fender lamp socket springs are not used in the fuel pump: these may be identified by the original type springs having 3 1/2 coils, and the later type 4 coils. | ||