Morris Mini 850

Models: Saloon; Van; Pick‑up

ENGINE

1. Type   ...             ...             4‑stroke; overhead valves; side camshaft

2. Cooling system                ...Water pump, radiator, fan and thermostat

3. Number of cylinders                   4 (bored) direct in block 113lb./sq.in.

4. Firing order and idling speed 1‑3 4 2 (No. 1 at front); 500 r.p.m.

5. Bore    ...             ...             2.478in. (62.94mm.)

6. Stroke                 ...             ...             2.687in. (68.25mm.)

7. Cubic capacity ...             848c.c. (51.7cu.in.)

8. Comp. ratio & pressure                   8.3:1; 150lb./sq.in.

9. Brake horse‑power           ...             34 at 5500 r.p.m.

10. Torque             ...             ...             44lb.ft. at 2900 r.p.m.

11. Piston oversizes             ...             .010, .020, .030, .040in.

12. Piston cl'nee (at skirt)  Bottom, .0006 to ‑0012in.; top, .0026 to.0032in.

13. Piston rings‑number      ...             3 compression, 1 oil

14. Piston rings‑width         ..Comp., .069 to .070in.; oil, 0. 124 to 0.125in.

15. Piston ring&‑groove cl'nee                     .0015 to .0035in.           

16. Piston rings‑ gap (in bore)                   .007 to .012in.

17. Oil pressure (lb. /sq.in.)         ... 60, normal; 15, idling (min.)

18. Gudgeon pin diameter ...                      0. 624in.

19. Gudgeon pin fit in piston                Hand push

20. Gudgeon pin fit in con. rod            Clamped

21. Crankpin diameter ...               1. 6254 to 1. 6259in.

22. Crankpin undersizes ... .010, ‑020, .030, .040in.

23. Connecting rod length ... 5. 75in. (centres)

24. Big end bearings  Steel‑backed lead‑bronze, lead indium

24a.             plated; or copper‑lead, lead‑tin plated

25. Big‑end bearing cl'nce   .001 to ‑0025in.

26. Big‑end side clearance  .008 to .012in.

27. Main journal diameter   1.7505 to 1.751 in.

28. Main journal undersizes               .010, .020, .030, .040in.

29. Main bearings ... ... 3, steel‑backed white‑metal

30. Main bearings‑length               1.187in.

31. Main bearing clearance... .0005 to .002in.

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

33. Crankshaft end thrust on Centre main bearing

34. Camshaft journal diam. (1) 1.6655 to 1.666in.; (2) 1.62275 to

34a.                                    1.62325in.; (3) 1.37275 to 1.3735in.

35. Camshaft bearings  3; front, steel‑backed w.m. others in block

36. Camshaft bearing cl'nce  (1) .001 to .002in.(2)(3).00125 to.00275in

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

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

39. Valve head diameter Inlet, 1.093 ,to 1.098in.exhaust,1.000 to 1.005in.

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

40a.                                  exhaust,0.2788 to 0.2793in.

41. Valve seat angle             45° inlet and exhaust

42. Valve lift          ...             ...             0. 285in.

43. Valve guide length     1. 687in. inlet and exhaust (fitted height,

43a.   .(fitted height, .594in  above machined spring seat)

44. Valve stem lguide cl'nee .Inlet, .0015 to .0025in.; exhaust,.002 to .003in.

45. Valve spring free length ... 1.625in.           

46. Valve spring rate (pres're) Valve open, 70lb.valve closed,37.5lb.

47. Valve working clearance .012in. inlet and exhaust (cold)

48. Valve timing cl'nce         ...             .019in.

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

49a.                              Exhaust opens 40° B.B.D.C.;closes 10° A.T.D.C.

50. Petrol pump     ...             ...             S.U.'mechanical, type AUF705

51. Carburettor      ...             ...             S.U., type HS2

52. Diameter          ...             ...             1.250in.

53. Needle (standard)          ...                EB

54. jet diameter                                      .090in.

56. Piston spring ...                                Red

57. Richer needle ...                              M

58. Weaker needle                ...             GG

TRANSMISSION

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

102. Clutch            .Borg & Beck, 7.125in. diam., diaphragm­spring type

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

105. Gearbox ratios         .             1 . 0; 1. 43; 2. 2 1 ; 3. 52; R., 3. 54:1

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

109. Final drive ratio            ...             3.765:1 (64/17)

113. Differential brg. pre‑load .003 to .004in. for latest type bearing

113a.                                              (housing/flange gap .011in)

BRAKES

201. Front (Lockheed)         ...             Hydraulic, 7in. diam. 2L.S.

202. Rear (Lockheed)             Hydraulic, 7in. diam. lead/trail. shoes

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

204. Linings‑‑‑front              ...             Don 202, 6. 75 X 1.5in.

205.         Linings‑rear           ...             ...Don 202, 6. 75 x 1. 25in.

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 14.5in. diam. 9.4in.above ground)0°15' included angle

306. Condition for checking ... Unladen

FRONT SUSPENSION

401. Type     Independent; rubber cone springs with telescopic dampers.

REAR SUSPENSION    

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

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

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

ELECTRICAL SYSTEM           Premium fuel      Commercial fuel

601. Ignition timing‑‑‑static          0° (T.D.C.)          7° B.T.D.C.

601a.‑‑‑ 600 r.p.m. (vac. off)      3° B.T.D.C.    10° B.T.D.C.

602. Sparking plugs ... ...                  Champion N9Y, 14mm.

603. Sparking plug gap   ... .                 025in.

604. Distributor (Lucas 25D4)            41026                    41007

605. Contract breaker gap ... .    014 to .016in.; dwell angle, 60 ± 3°

606.Centrif.advance check      30°/34° at 3400           22°/26° at 5000

606a.[Decelerating; vacuum       16°/20° at 1300       15°/19° at 3900

606b.      pipe disconnected]       9°/ 15° at 900     1°/ 5° at 1700

606c.                                               1°/ 7° at 700         None below 850

608. Vacuum ady. starts at .       '          7in. Hg.            5in. Hg.

609. Vacuum adv.‑max.                   10° at 13in. Hg.    16° at 11 in. Hg.

609a.                            (Crankshaft degrees and r.p.m.)

610. Ignition coil ... ... Lucas, type LA12‑‑‑

611. Battery‑‑‑... ... Lucas, 12v. 30 or 40a.h. (20‑hr. rate)

612. Battery earth ... ... Negative

613. Dynamo/Alternator ... Lucas, type C40‑1/16ACR or 17ACR

614. Control box (dynamo)Lucas, type RB106/2;cut‑in,

614a                        12.7/13.3v.; drop‑off, 8.5/11.0v.

615. Starter motor ... ... Lucas, type M35J

CAPACITIES

701. Engine sump  8.5 pints,transmission case,including 1pint for filter

702. Gearbox ..     .8.5 pints,transmission case,including 1pint for filter

703. Differential  ..8.5 pints,transmission case,including 1pint for filter

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

705. Fuel tank   ...         ... Saloon, 5.5 gallons;  Van and P.U. 6 galls.

706. Tyre size,   ... ... 5.20 x 1 0in. or 145 x 10 radial ply

707. Tyre pressures (lb./sq.in.) Front, 24; rear (normal) 22, fully loaded) 24.

707a.                                           Radial: F, 28; R., 26

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

708a.                              plus gear‑change shaft at major overhauls

709. Servicing intervals   ...               3,000 miles

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

DIMENSIONS                                  Saloon      Van     Pick‑up

801. Length overall         ...               120¼in.   129⅞in. 130½in.

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

803. Height overall          ...                  53in.     54.5in.      53.5in.

804. Weight (kerb)                              1363lb.     1334lb.     1328lb.

805. Ground cl'nce (min.)                   6.156in.      6.156in.     6.156in.

806. Track         ...         ...         ......      Front, 47.4375in.; rear, 45.875in .

807. Wheelbase ...                             80.156in.           84.156in.    84.156in.

808. Turning circle diam.                        28.5ft.           29ft.             29ft.

TORQUE SPANNER DATA                                  (lb.ft.)

901. Cylinder head nuts                                        40

902 .Driven gear to diff.cage                                60

903. Big‑end bearing nuts                                     35

904. Main bearing nuts                                          60

905. Gudgeon pin clamp bolt                                25 

906. Flywheel centre bolts ...                             110 to 15

907. Roadwheel nuts                                           42

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

909 End cover bolts (diff.housing)                      18

911. Steering wheel nut                                     32/37

BODY AND CHASSIS

1001. Type of construction ...      [ Integral all‑steel construction, with

1002. Material of body panels ...                      front sub‑frame]

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