TUNING DATA ENGINE Type Firing order Capacity Compression ratio Compression pressure Idle speed .. Fast idle speed Valve rocker clearance Stroboscopic ignition timing Static ignition timing Timing mark location DISTRIBUTOR Make Type Serial number . Contact breaker gap Rotation of rotor Dwell angle Condenser capacity Centrifugal advance Crankshaft degrees* Vacuum advance Starts Finishes . . . . . . Total crankshaft degrees SPARKING PLUGS Make Type Gap IGNITION COIL Make Type . . Resistanceprimary Consumption Ignition onstanding . . at 2,000 rpm. CARBUREITER(S) Make . . . . Type . . . . . . . . Specicationxed needle type. . spring-loaded needle type Choke diameter Jet size . . . . Needlexed type . . spring-loaded type Piston spring Initial jet adjustment EXHAUST EMISSION Exhaust gas analyser reading: At engine idle speed Air pump test speed Engine Emission. Issue 6. 8393159 MODEL: MGB To 1971 18GF, 18GH,.or v18GJ 1, 3, 4, 2, 1798 c.c. (109-8 cu. in.) 8-8 : 1 160 lb./sq. in. (171-25.kg./cm.2) 900 rpm. 1,300to 1,400 r,p.m. 015 in. (38 mm.) set cold 20 B.T.D.C. at 1,000 rpm. 10 B.T.D.C. Pointer on timing case, notch on crankshaft pulley Lucas 25D4 40897 or 41155 014 to ~016sinu (83:5 to ~40 mm.) Anti-clockwise 57 to 63 ~18 to -24 mF 10 at 400 to 600 rpm. 24 at 1,500 to 1,750 rpm. 30;t2" at 3,000 rpm. 5 in. Hg 13 in. Hg 20;l;2 Champion N9Y ~024 to 026 in. (625 to 660 mm.) Lucas HA12 3-1 to 35 ohms at 20 C. (68 F.) 39 amps. 14 amps. S.U. Twin HS4 AUD 265 AUD 326 1% in. (38-1 mm.) 090 in. (2-2 mm.) FX AAE Red 143atsfrom bridge .. ., 425%:00vcmaximgum) 1409011va li "7 Vacuum pipe disconnected. 443 1971 18GK. 1, 3, 4, 2 1798 c.c. (1098 cu. in.) 8-8 : .1 160 lbgfsq. in. (11-25 kg./cm.2) 906Fr.p.m. 1,300 to 1,400 npm. 015 in. (~38 mm.) set cold 15 B.T.D.C. at 1,500 rpm. 10 B.T.D.C. Pointer on timing case, notch on crankshaft pulley Lucas 25D4 41339 014 to 016 in. (~35 to -40 mm.) Anti-clockwise 57 to 63 ~18 to ~24 mF 10 at 900 to 1,100 rpm. 24 at 2,700 to 2,900 rpm. 30 i2 at 4,600 rpm. 7 in. Hg 13 in. Hg 10:1;2 Champion N9Y ~024 to 026 in. (625 to -660 mm.) Lucas HA12 3-1 to 35 ohms at 20 C. (68 F.) 39 amps. 14 amps. S.U. Twin HS4 AUD 465 1% in. (381 mm.) 090 in. (2-2 mm.) AAL Red 12 ats from bridge 4~5 % CO (maximum) 1,000 rpm. (engine) 59