MGB Torque Settings

1 MGB Torque SpecificationsArea of UseTorque (ft/lbs)NotesGeneral UseGearbox remote control cover to tunnel44 to 46 All modelsHydraulic brake pipe connection, 3/8 UNF5 to 7 Hydraulic brake pipe connect, 7/16 UNF7 to 10 Alternator shaft nut25 to 30 All modelsInterior mirror special screw5 All modelsMaster cylinder port adaptors33later models (RBB)Master cylinder reservoir fixing bolts5 All modelsBrake pressure failure switch (nylon)15 Brake pressure failure switch end plug200 All modelsAir pump mounting screws18 Spark plugs18 All modelsPropeller shaft flange nuts30 to 35 All modelsBrake caliper securing bolts40 to 45 All modelsBrake front servo bolts8 to 13 All modelsBrake rear servo bolts13 to 27 All modelsBrake stone guard screws17 to 19 All modelsPressure differential switch end plug17later models (RBB)Alternator mounting bolt20 All modelsAlternator pulley nut25 All modelsStarter motor mounting bolts30 All modelsEngine FastenersMain bearing nuts70 All modelsFlywheel set screws4018G/18 GAGudgeon pin clamp bolts2518G/18GA (early CBB)Big-end bolts+35 to 40early models(CBB)Big-end bolts33later models (RBB), oiled threadCylinder head nuts45 to 5018G/18 GARocker bracket nuts25 All modelsOil pump to crankcase14 All modelsSump to crankcase6 All modelsCylinder side cover screws218G/18 GACylinder side cover screws, deep cover518G/18 GATiming cover, 1/4 inch screws618G/18 GATiming cover, 5/16 inch screws1418G/18 GARear plate, 5/16 inch screws20 All modelsRear plate, 3/8 inch screws30 All modelsWater pump to crankcase25early models(CBB)Water pump to crankcase17later models (RBB)Water outlet elbow nuts818G/18 GARocker cover nuts418G/18 GAManifold nuts15 All modelsOil filter center bolt1518G/18GA (early CBB)

2 Clutch to flywheel25 to 30 All modelsCarburettor stud nuts218G/18 GACarburettor stud nuts15 All modelsDistributor clamp bolt (nut trapped)418G/18 GADistributor clamp bolt (bolt trapped)2 to 318G/18 GAFan blade fixing screws7 to 918G/18GA0 Crankshaft pulley nuts70 All modelsCamshaft nut60 to 70 All modelsOil pipe banjo37 maxAll modelsFront plate, 5/16 inch screws20 All modelsRear engine mounting bolt38 to 40 All modelsOil pressure relief valve domed nut43 Pre-1978 Oil pressure relief valve domed nut401978 onRocker bracket nuts25 All modelsArea of UseTorque (ft/lbs)NotesGearbox FastenersFront brake band adj. screw locknut15 to 20automatic transmissionRear brake band adj. screw locknut25 to 30automatic transmissionFiller tube to transmission case20 to 30automatic transmissionFiller tube to connector sleeve nut17 to 18automatic transmissionDrive flange nut55 to 60automatic transmissionCenter support bolts10 to 18automatic transmissionMounting to gearbox case15 to 20manual transmissionDrive flange nut, without overdrive150manual transmissionDrive flange nut, overdrive Type D100 to 130manual transmissionDrive flange nut.

3 Overdrive Type LH55 to 60manual transmissionConverter to drive plate bolts25 to 30automatic transmissionTransmission case to converter housing8 to 13automatic transmissionExtension housing to transmission case8 to 13automatic transmissionOil pan to gearbox8 to 13automatic transmissionFront servo bolts8 to 13automatic transmissionRear servo bolts13 to 27automatic transmissionPump adaptor to housing screw2 to 3automatic transmissionPump adaptor to housing bolts17 to 32automatic transmissionPump adaptor to transmission case8 to 18automatic transmissionManual shaft locknut7 to 9automatic transmissionPressure adaptor plug4 to 5automatic transmissionDrain plug8 to 10automatic transmissionUpper valve body to lower valve body scr20 to 30automatic transmissionLower valve body to upper valve body scr20 to 30automatic transmissionOil tube and end plate to valve body20 to 30automatic transmissionValve bodies to transmission case bolts5 to 9automatic transmissionCam bracket screws20 to 40automatic transmissionGovernor to counterweight screws4 to 5automatic transmissionGovernor to cover plate screws20 to 48automatic transmissionFront servo adjusting screw locknut15 to 20automatic transmissionRear servo adjusting screw locknut25 to 30automatic transmissionStarter inhibitor switch locknut4 to 6automatic transmissionDownshift cable adaptor bolts8 to 9automatic transmissionFiller tube connector to transmission20 to 30automatic transmissionStone guard screws17 to 19automatic transmissionDriving flange nut55 to 60automatic transmissionSteering FastenersSteering arm bolts60 to 65 All modelsSteering rack fixings v30 All modelsSteering wheel nut41 to 43 All modelsSteering wheel nut, 9/16 in.

4 UNF27 to 29 GHN4, GHD4,GHD5,GHN5 modelsSteering wheel nut, 11/16 in. UNF41 to 43 GHN4, GHD4,GHD5,GHN5 modelsSteering wheel nut36 to 38 GHN4, GHD4,GHD5,GHN5 some local modelsSteering column universal joint bolts20 to 22 All modelsSteering rack and pinion bearing nut40 All modelsSteering tie-rod lock nut33 to 38 All modelsSteering lever balljoint nut34 to 35 All modelsSwivel pin nut60 All models; tighten to align to next holeSteering column top fixing bolts12 to 17 All modelsRoad wheel nuts60 to 65 All modelsRear Suspension FastenersRear shock absorber bolts55 to 60 All modelsArea of UseTorque (ft/lbs)NotesFront Suspension FastenersFront shock absorber bolts43 to 45 All modelsBrake disc to hub40 to 45 All modelsBrake caliper mounting40 to 45 All modelsBearing retaining nut40 to 70 All modelsCross member to body54 to 56 All modelsShock absorber pinch bolt28 All modelsWishbone cross bolt28 All modelsAnti roll bar link60 All modelsSpring pan nuts and screws22 All modelsStiff nut to crossmember mounting bolt44 to 46 GHN4, GHD4,GHD5,GHN5 modelsKing pin to wishbone - lower fulcrum 45 King pin to damper - upper fulcrum 40 King pin trunnion (nut on top of king pin)

5 65 Rear Axle FastenersHalf-shaft nut150 Semi floating axle, tighten to align to next holeDifferential bearing cap bolts60 to 65three-quarter floating axleCrown wheel bolts60 to 65 All modelsPinion nut, new spacer only180 to 220 Pinion bearing nut135 to 140three-quarter floating axleAxle shaft nut150tighten to align to next holeCrown wheel to differential carrier55 to 60three-quarter floating axleBearing retaining nut180three-quarter floating axleDifferential bearing cap bolts50 to 55semi- floating axlePinion nut, oil seal changesee section Ha, Bentley & Leyland Workshop ManualAdjust to preload SizeGrade 2 Iron Grade 5 Iron Grade 8 IronAlumn1/4-20 (NC)6 7116 5/16-18 (NC)18 1522123/8-16 (NC)3040207/16-14 (NC)324565351/2-13 (NC)507095559/16-12 (NC)70100140805/8-11 (NC)1001351901103/4-10 (NC)1752403401907/8-9 (NC)3605502801-8 (NC)530820420 SizeGrade 2 Iron Grade 5 Iron Grade 8 IronAlumn1/4-28 (NF)6 91375/16-24 (NF)12 1724143/8-24 (NF)3045257/16-20 (NF)365070401/2-20 (NF)5575110609/16-18 (NF)80110155855/8-18 (NF)1101552151203/4-16 (NF)2002703802107/8-14 (NF)3906103101-14 (NF)590890480 Coarse ThreadedFine ThreadedBased on the use of lubricated threadsGeneral Torque Values by Fastener Siz