GENERAL DATA (GHNS/GHDS CARS, 18V type ENGINE) The following information is applicable to the GHNS and GHDS series cars from Car No. 258001 tted with the 18V type engine, and should be used in conjunction with the preceding specications. ENGINE Type. Synchromesh gearbox . . . . . . . . 18V 581F18V 581Y. Synchromesh gearbox with overdrive . . . . . . 18V 582F18V 582Y. Automatic transmission . . . . . . . . . . 18V 583F18V 583Y. Valves Inlet valve: Seat angle . . . . . . . . . . 454?. Head diameter . . . . . . . . . . 1625 to 1630 in. (41-27 to 41-40 mm.). Stem diameter . . . . . . . . . . 03429 to 03434 in. (8-70 to 8-72 mm). Stem to guide clearance . . . . . . 0-0008 to 0-0018 in. (0020 to 0-046 mm.). Valve spring Free length . . . . . . . . . . . . . . 1-92 in. (48-77 mm.). Fitted length . . . . . . . . . . . . . . 1-44 in. (36-58 mm.). Load at tted length . . . . . . . . . . . . 82 lb. (37-2 kg). Load at top of lift . . . . . . . . . . . . 142 lb. (64-4 kg.). ELECTRICAL Starter motor Type . . . . . . . . . . . . . . . . Lucas 2M100 Pre-engaged. Brush spring tension _. . . . . . . . . . . . 36 oz. (1-02 kg). Minimum brush length . . . . . . . . . . % in. (9-5 mm.). Minimum commutator thickness . . . . . . . . 0-140 in. (3-5 mm.). Lock torque . . . . . . . . . . . . . 14-4 lb. ft. (202 kg. m.) with 463 amps. Torque at 1,000 r. p. m. . . . . . . . . . . 7-3 lb. ft. (102 kg. m.) with 300 amps. Light running current . . . . . . . . . . 40 amp. at 6,000 rpm. (approx) Maximum armature endoat . . . . . . . . 0-010 in. (0-25 mm.). Solenoid: Closing (series) winding resistance . . . . 0-25 to 0-27 ohm. Hold-on (shunt) winding resistance . . . . 0-76 to 080 ohm. Tourer GT FRONT SUSPENSIONFrom Car No. . . . . . . 293446. 296196. Spring coil diameter (mean) . . . . . . . . . . 3-238 in. 3- 28 in. (82-24 mm.). (83 31 mm) Free height . . . . . . . . . . . . . . 10-20:;0-06 in. 9- 32 115 1n. (259-08i1-5 mm.). (236- 73:1-6 mm.). Static length at load of 1,030jz20 lb. (467:9 kg.) . . . . 7-24 in. (187-70 mm.). Static length at load of 1,193:20 lb. (541i9 kg.) . . . . 6-84 in. (173-74 mm.). No. of free coils .. .. .. .. .. .. .. 7-5. 7-2. MGB. Issue 2. 83910 General Data 19 65