Morris Mini 1275 G.T.

ENGINE

1. Type (12H)     ...         ... 4‑stroke; overhead valves; side camshaft

2. Cooling system Radiator, water pump, fan and thermo‑stat 180°F 82°C 13lb./sq.in

3. Number of cylinders ...                     4

4. Firing order and idling 1‑3‑4‑2 (No. 1 at left side); 650r.p.m. speed

5. Bore  ...         ...         ... 2.78in. (70.61mm.)

6. Stroke ... ... ... 3.2in. (81.28mm.)

7. Cubic capacity ... ... 1,275c.c.

8. Compression ratio and pressdure 8.8:1; 150/180lb./sq.in. at 300 to 400 r.p.m.or 8:1

9. Brake horse‑power (net) ... 62 at 5,250 r.p.m. (8.8:1)

10. Torque ... ... ... 69lb.ft. at 3,500 r.p.m. (8.8:1)

11. Piston oversizes ...   .010, .020in. (max.)

12. Piston clearance in bore .0015/.0021in(skirt bottom).0029/.0037in.(skirt top)

13. Piston rings‑‑‑number ... 3 compression, 1 oil (Duaflex 61)

14. Piston rings‑width ... Comp., .0615 to .0625in.

15. Piston rings‑groove cl'nce Comp., .0015 to .0035in.

16. Piston ring&‑gap (in bore) Top.011 to .016in(2)(3).008 to .013in.oil .012 to .028in.

17. Oil pressure ... ... 70lb./sq.in. running; 15 idling

18. Gudgeon pin diameter ... 0. 8123 to 0. 8125in.

19. Gudgeon pin fit in piston Hand push fit

20. Gudgeon pin fit in con. rod Press fit, .0008 / .0015in. interference

21. Crankpin diameter ... 1.7504 to 1.7509in.

22. Crankpin undersizes ... .020 and .040in.

23. Connecting rod length ... 5. 748 to 5. 752 in.

24. Big‑end bearings      ... Steel backed, copper‑lead‑indium, thin wall

25. Big‑end bearing clearance .001 to .0025in.     

26. Big‑end side clearance ... .006 to .010in.

27. Main journal diameter ... 2.0005 to 2.0010in.

28. Main journal undersizes... .020 and .040in.

29. Main bearings ... ... 3; thin‑wall, copper‑lead‑indium

30. Main bearings‑length ... 0. 975 to 0. 985in.

31. Main bearing clearance... .001 to .0027in.

32. Crankshaft end‑float ... .002 to .003in.

33. Crankshaft end‑thrust on Centre main bearing

34. Camshaftjournal diameter(1)1.6655/1.666in(2)1.62275/1.62325in.(3)1.37275/1.3735in.

35. Camshaft bearings    ... 3, white‑metal, steel‑backed

36. Camshaft bearing cl'nce... ‑001 to .002in.

37. Camshaft end‑float ... .003 to .007in.

38. Camshaft drive type ... Chain; 52 x .375in. pitches

39. Valve head diameter ... Inlet, 1.307/1.312in.; ex., 1.1515/ 1.1565in.

40. Valve stem diameter ... Inlet, 0.2793 to 0.2798in.; exhaust, 0.2788 to 0.2793in.

41. Valve seat angle                               45°

42 Valve lift        ...         ...         0. 318in. inlet and exhaust

43. Valve guide length    ... Inlet, 1.6875in.exhaust, 1.8437in.(0. 540in. above head)

44. Valve stem /guide cl'nce... .0015 to .0025in.

45. Valve spring free length ... 1. 95in.

46. Valve spring rate Load at fitted length (closed) 79.5lb.at 1.383in.at top of lift,124lb.

47. Valve working clearance .012in. (0.305mm.) cold

48. Valve timing clearance ... .021in.

49. Valve timing ... ... Inlet opens 5° B.T.D.C.; closes 45° A.B.D.C.

49a.                            Exhaust opens 51° B.B.D.C.; closes 21° A.T.D.C.

50. Petrol pump ... ...          S.U. mechanical   type AUF 705

51. Carburettor   ... ...          S.U., type HS4

52. Diameter ... ... ...              1.5in.

53. Needle (standard)     ...   AC

54. jet diameter ... ...           .090in.

56. Piston spring ... ...           Red

57. Richer needle ... ...         BQ

58. Weaker needle ... ...      HA

TRANSMISSION

101. Type ... ... ... Front wheel drive

102. Clutch ... ... ... Borg & Beck 7.5in. diam., diaphragm type

103. Gearbox ... ... ... 4 forward speeds, all synchromesh

105. Gearbox ratios ... ... 1; 1. 35; 2.07; 3.30; R., 3.35:1

107. Driving axles ... ... Solid shaft, reverse spline; Hardy Spicer hemispherical joint

109. Final drive ratio       ... 3.65:1 (62/17)

113. Diff. bearing pre‑load .003 to .004in. (housing/flange gap, .011in.)

BRAKES

201. Front Lockheed hydraulic, 7.5in. diam. disc‑type

202. Rear Lockheed hydraulic, 7in. diam. drum­ type (leading /trailing shoes)

203. Handbrake Mechanical, on rear wheels only (cable­operated)

204. Linings‑front           ...         M78 pads, minimum thickness    1/16in.

205. Linings‑rear            ...         Don 202; 6. 75 x 1. 5in.

206. Power assistance   ...         Vacuum servo; Lockheed Type 6

STEERING (see also "Dimensions")

301. Type          ...         ...         Rack and pinion

302. Camber angle         ...         1° to 3° positive

303. Castor angle           ...         3°

304. King‑pin inclination  ...         9° 30'

305. Toe‑out   1/16in. (on a 141in. diameter, 9.4in. above ground)0°15' included angle

306. Conditions for checking ... Unladen

FRONT SUSPENSION

401. Type ... ... ... Independent, rubber cone springs with telescopic damper

REAR SUSPENSION

501. Type ... ... ... Independent, rubber cone springs with telescopic dampers

502. Wheel camber (rear) ... 1° positive

503. Toe‑in (rear) ... ...           .125in.

ELECTRICAL SYSTEM

601. Ignition timing‑‑‑static 8° B.T.D.C.

601a.‑stroboscope 10° B.T.D.C. at 600 r.p.m. (vac. off)

602. Sparking plugs ... ... Champion N9Y

603. Sparking plug gap   ... .025in.

604. Distributor  ...         ... Lucas 25D4, 41257

605. Contact breaker gap            ... .014/.016in.; dwell angle 60°± 3°

606. Centrif. advance starts at* 18°/22° at 4000; 11°/15° at 2,800;

607. Centrif. advance‑max.6°/10° at 2,000 4°/8° at 1600 0°/3°at 800;none below 300 r.p.m.

608. Vacuum advance starts at                3in. Hg.

609. Vacuum advance‑‑‑max.          18°/22° at 10in. Hg.

609a.*Vacuum pipe off. Crankshaft degrees and r.p.m.

610. Ignition coil             ...         Lucas LA 12

611. Battery      ...         ...         12v. 40 or 50a.h. (20‑hr.)

612. Battery earth          ...         Negative

613. Dynamo or alternator           ...         Lucas C40 or 16ACR

614. Control box            ...         Lucas RB 106/2 (alternator, 8TR integral)

615. Starter motor          ...         Lucas M35J

CAPACITIES

701. Engine sump          ...          8.5 pints reffil (incl. filter)

702. Gearbox     ...         ...         8.5 pints reffil (incl. filter)

703. Differential  ...         ...           8.5 pints reffil (incl. filter)

704. Cooling system      ...         ...         5.250 pints (6.250 with heater)

705. Fuel tank   ...         ...         5.5 gallons

706. Titre size    ...         ...         145 x 10. radial Plv with tube

707. Tyre pressures (lb./sq.in.) Front, 28; rear, 26, (all conditions)

708. No. of grease gun points 8 (steering 6; rear radius arms 2)

708a.plus gear‑change shaft at major overhauls only

709. Servicing intervals   ...         3,000 miles

710. Hydraulic fluid         Lockheed 329; Unipart    550;Castroll Girling Green

DIMENSIONS

801. Length overall ... ...        124.656in.

802. Width overall ... ...            55.5in.

803. Height overall ... ...           53in.

804. Weight (kerb) ... ...           1555lb. (13‑9cwt.) approx.

805. Ground clearance (min.)      6in.

806. Track ...                              Front 48.5in.‑Rear 47..625in.

807. Wheelbase ...         ...          80.156in.

808. Turning circle diameter ...    28ft. 6in.

TORQUE SPANNER DATA                  (lb.ft.)

901. Cylinder head nuts ...                      50

902. Big‑end bearing nuts           ...       31/35

903. Main bearing nuts   ...                      60

905. Flywheel bolts ...    ...                  110/115

907a.Driving flange to diff. nut               70 (and align to next split pin hole)

908a.Driven gear to diff. cage...            60

909b.End cover bolts (diff. lisg.)           18

910. Road wheel nuts ... ...                    42

911. Steering wheel nut  ...                 32/37

BODY AND CHASSIS

1001. Type of construction           Integral all‑steeI construction, with front sub‑frame

1002. Material of body panels       Integral all‑steeI construction, with front sub‑frame

1003. Windscreen glass ...         Toughened (laminated optional)