What engine type does a 1971-72 MGB have?

The 1971-2 MGB uses the 18V 584Z (EEC, ELC—Non overdrive) or 18V 585Z (EEC, ELC—Overdrive) engine.

What carburetter needle is used on the 18V 584Z and 18V 585Z engines?

AAU. Other needles listed: 18GF uses FX, 18GH-18GJ use AAE, 18GK uses AAL, and 18V 672Z/673Z use ABD.

What distributor does the MGB use and what are the serial numbers?

A Lucas 25D4. Serial numbers: 18GF – 40897; 18GH-18GJ – 41155; 18GK – 41339; 18V 584Z and 585Z – 41370; 18V 672Z and 673Z – 41491.

What is the MGB steering-wheel nut torque?

36 to 38 lb. ft. (4·98 to 5·26 kg. m.), or 27 to 29 lb. ft. (3·73 to 4·00 kg. m.) for the 9/16 in. UNF steering-wheel nut.

What is the fuel tank capacity for MGBs with 18GJ or 18GK engines?

12 U.S. gallons (45·4 litres).

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MGB 1967-1973 General Data: Engine Types, Carb Needles, Distributor & Torque Specs

MGB General Data: engine type numbers, distributor specs and torque wrench settings page

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MGB factory General Data listing 18GF/18GH/18GK/18V engine type numbers by year, distributor serial numbers and brake/spark-plug torque settings.

AI caption September 2012 · Photo 38 of 101

This is page 64 ("General Data 18") of the MGB workshop manual (Issue 3, 83910), presenting supplementary general data for MGB models GHN5/GHN4 and GHD5/GHD4 fitted with equipment to local and territorial (emission) requirements. It lists engine types by year: 18GF (1967-69), 18GH and 18GJ (1969-70), 18GK (1970-1), 18V 584Z/585Z (1971-2, non-overdrive/overdrive), and 18V 672Z/673Z (1972-3), all with Exhaust Emission Control (EEC) and some with Evaporative Loss Control (ELC). It notes that servicing emission-controlled engines must follow Workshop Manual Supplement AKD 4957. Fuel system data gives a 12 U.S. gallon (45.4 litre) tank capacity for 18GJ/18GK engines and carburetter needle codes per engine type (FX, AAE, AAL, AAU, ABD). Distributor data specifies the Lucas 25D4 with serial numbers per engine (40897, 41155, 41339, 41370, 41491). Torque wrench settings are listed for steering column and wheel fasteners, master cylinder adaptors and reservoir bolts, brake pressure failure switch components, and hydraulic brake pipe connections, in lb. ft./lb. in. with metric kg. m. equivalents. Useful for identifying engine type by year, selecting correct carburetter needles, distributor identification, and torquing steering/brake hardware.

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Frequently asked questions

What engine type does a 1971-72 MGB have?: The 1971-2 MGB uses the 18V 584Z (EEC, ELC—Non overdrive) or 18V 585Z (EEC, ELC—Overdrive) engine.
What carburetter needle is used on the 18V 584Z and 18V 585Z engines?: AAU. Other needles listed: 18GF uses FX, 18GH-18GJ use AAE, 18GK uses AAL, and 18V 672Z/673Z use ABD.
What distributor does the MGB use and what are the serial numbers?: A Lucas 25D4. Serial numbers: 18GF – 40897; 18GH-18GJ – 41155; 18GK – 41339; 18V 584Z and 585Z – 41370; 18V 672Z and 673Z – 41491.
What is the MGB steering-wheel nut torque?: 36 to 38 lb. ft. (4·98 to 5·26 kg. m.), or 27 to 29 lb. ft. (3·73 to 4·00 kg. m.) for the 9/16 in. UNF steering-wheel nut.
What is the fuel tank capacity for MGBs with 18GJ or 18GK engines?: 12 U.S. gallons (45·4 litres).

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