| Bore and stroke: |
|
|
| A, C |
|
3.125 x 3.5 (79.375 x 88.9
mm) |
| B |
|
3.281 x 3.5 (83.34 x 88.9 mm) |
| Compression ratio: |
|
|
| A |
|
8.25:1 |
| B |
|
9:01 |
| C |
|
8.7:1 |
| Crankshaft: |
|
|
| Main journal diameter: |
|
|
| A, B, C |
|
2.3742 to 2.3747 (60.305 to
60.317) |
| Main bearings: |
|
|
| A, B, C.
Length |
|
1.495 to 1.505 (37.973 to
38.227 mm) |
| A, B, C.
Material |
|
White metalled steel shell,
lead indium plated |
| Diametrical clearance: |
|
|
| A, B, C |
|
.0013 to .0028 (.033 to .071
mm) |
| Undersizes: |
|
|
| A |
|
-.010, .020, .030, .040 |
| B and C |
|
-.010, .020 |
| Crankpin diameter: |
|
|
| A, B, C |
|
2.0000 to 2.0005 (50.80 to
50.8127 mm) |
| Thrust washers, standard: |
|
|
| A, B, C |
|
.091 to .093 (2.315 to 2.366
mm) |
| |
|
+.0025 (.063 mm) |
| |
|
+.005 (.127 mm) |
| |
|
+.0075 (.190 mm) |
| |
|
+.010 (.254 mm) |
| Bore oversizes: |
|
|
| A, B, C |
|
.010,.020,.030,.040
(.25,.50,.76,1.02 mm) |
| Firing order: |
|
|
| A, B, C |
|
1,5,3,6,2,4 |
| Torque: |
|
|
| A |
|
142 lb ft at 2400 rev/min
(19.77 kg m) |
| B |
|
167 lb ft at 2700 rev/min
(23.09 kg m) |
| C |
|
150 at 3000 rev/min |
| BMEP: |
|
|
| A |
|
139 lb/sq in (9.77 kg/sq cm) |
| B |
|
142 lb/sq in (9.98 kg/sq cm) |
| Engine idle speed
(approx.): |
|
|
| B |
|
500 rev/min |
| Connecting rods: |
|
|
| Length between centres: |
|
|
| A, B, C |
|
6.601 to 6.605 (167.66 to
167.76 mm) |
| Side clearance: |
|
|
| A, C |
|
.004 to .007 (.10 to .18 mm) |
| B |
|
.005 to .009 (.13 to .23 mm) |
| Big-end bearing material: |
|
|
| A, B, G |
|
White metalled steel shells,
lead indium |
| Big-end diametrical
clearance: |
|
|
| A |
|
.0005 to .002 (.0127 to .051
mm) |
| B |
|
.002 to .0035 (.051 to .089
mm) |
| Small-end bush: |
|
|
| A |
|
.8750 to .8755 (22.225 to
22.328 mm) |
| B |
|
.8749 to .8751 (22.22 to
22.23 mm) |
| Reground crankpin sizes: |
|
|
| A |
|
.010, .020, ,030, .040 |
| |
|
(.254, .508, .762, 1.016 mm) |
| B |
|
.010, .020 (.254, .508 mm) |
| Pistons: |
|
|
| Material |
|
Low expansion aluminum |
| A, B, C |
|
Alloy |
| Clearance at skirt
(right angles to gudgeon pin): |
|
|
| A |
|
.0226 to .0008 (.066 to .020
mm) |
| B |
Top |
.0032 to .0043 (.081 to .109
mm) |
| |
Bottom |
.0010 to .0016 (.025 to .040
mm) |
| Width of ring groove: |
|
|
| A |
Compression |
.0952 to .0962 (2.410 to
2.436 mm) |
| |
Oil |
.189 to .190 (4.81 to 4.83
mm) |
| B |
Compression |
.1417 to .1482 (3.599 to
3.764 mm) |
| |
Oil |
.1567 to .1632 (3.98 to 4.137
mm) |
| Oversizes: |
|
|
| A, B, C |
|
+.010,.020,.030,.040 |
| |
|
(.25,.50,.76,1.02 mm) |
| Piston rings: |
|
|
| A, B |
|
3 compression (2 taper), 1
oil control |
| C |
|
First ring taper |
| Width compression: |
|
|
| A |
|
.0938 to .0928 (2.383 to
2.357 mm) |
| B |
Compression and oil |
.1262 to .1332 (3.2055 to
3.3832 mm) |
| A |
Width-oil |
.1865 to .1875 (4.737 to
4.762 mm) |
| Clearance in groove: |
|
|
| A |
Compression |
.0034 to .0014 (.086 to .036
mm) |
| |
Oil |
.0015 to .0035 (.038 to .088
mm) |
| B |
Compression and oil |
.0015 to .0035 (.038 to .088
mm) |
| Ring gap: |
|
|
| A |
Compression and oil |
.009 to .014 (.23 to .35 mm) |
| B |
|
.013 to .018 (.33 to .46 mm) |
| Gudgeon pins. Type: |
|
|
| A |
|
Clamped in rod |
| A, B from #40501 |
|
Fully floating (circlips) |
| A, B |
|
Selective, push in piston |
| A, B |
|
.8748 to .8750 (22.215 to
22.220 mm) |
| Camshaft: |
|
|
| Journal diameters: |
|
|
| A, B |
Front |
1.78875 to 1.78925 (45.434 to
45.447 mm) |
| |
Middle front |
1.76875 to 1.76925 (44.926 to
44.939 mm) |
| |
Middle rear |
1.74875 to 1.74925 (44.418 to
44.431 mm) |
| |
Rear |
1.72875 to 1.72925 (43.910 to
43.923 mm) |
| End float taken on
thrust plate at front end: |
|
| A, B |
|
.003 to .006 (.076 to .152
mm) |
| Camshaft bearings: |
|
|
| Number and type: |
|
|
| A and B |
|
4 thinwall rolled bush |
| Outside diameter: |
|
|
| A and B Front |
|
1.9205 (48.780 mm) |
| A and B Middle
front |
|
1.9005 (48.272 mm) |
| A and B Middle
rear |
|
1.8805 (47.762 mm) |
| A and B Rear |
|
1.8605 (47.252 mm) |
| Inside diameter, reamed
in position: |
|
|
| A and B Front |
|
1.79025 to 1.79075 (45.472 to
45.485 mm) |
| A and B Middle
front |
|
1.77025 to 1.77075 (44.964 to
44.977 mm) |
| A and B Middle
rear |
|
1.75025 to 1.75075 (44.456 to
44.469 mm) |
| A and B Rear |
|
1.73025 to 1.73075 (43.946 to
43.959 mm) |
| Clearance: |
|
|
| A and B |
|
.002 to .001 (.051 to .025
mm) |
| Tappets: |
|
|
| A and B |
Type |
Cylindrical, spherical foot |
| A and B |
Diameter |
.93725 (23.81 mm) |
| A and B |
Length |
2.548 (64.72 mm) |
| Valves: |
|
|
| Seat angle inlet: |
|
|
| A |
|
30 deg. |
| B |
|
45 deg. |
| Seat angle exhaust: |
|
|
| A and B |
|
45 deg. |
| Head diameter inlet: |
|
|
| A |
|
1.693 to 1.683 (42.99 to
42.75 mm) |
| B |
|
1.750 to 1.745 (44.45 to
44.32 mm) |
| Head diameter exhaust: |
|
|
| A |
|
1.420 to 1.415 (36.07 to
35.94 mm) |
| B |
|
1.5625 to 1.5575 (39.69 to
39.56 mm) |
| Stem diameter inlet: |
|
|
| A and B |
|
.34175 to .34225 (8.68 to
8.69 mm) |
| Stem diameter exhaust: |
|
|
| A and B |
|
.34175 to .34255 (8.68 to
8,69 mm) |
| Valve lift: |
|
|
| A and B |
|
.3145 (8.054 mm) |
| Mks II and III |
|
.368 (9.36 mm) |
| Stem guide clearance
inlet: |
|
|
| A and B |
|
.0025 to .0015 (.063 to .038
mm) |
| Stem guide clearance
exhaust: |
|
|
| A and B |
|
.002 to .001 (.051 to .025
mm) |
| Seat face width inlet: |
|
|
| A and B |
|
.091 to .097 (2.31 to 2.46
mm) |
| Seat face width exhaust: |
|
|
| A and B |
|
.198 to .217 (5.03 to 5.51
mm) |
| Valve guides: |
|
|
| Length inlet: |
|
|
| A and B |
|
2.266 (57.55 mm) |
| Length exhaust: |
|
|
| A and B |
|
2.578 (65.49 mm) |
| Fitted height above
head: |
|
|
| B Inlet |
|
1.348 (34.23 mm) |
| B Exhaust |
|
1.036 (26.32 mm) |
| Valve springs: |
|
|
| Free length: |
|
|
| A and B |
Inner |
1.969 (50 mm) |
| A and B |
Outer |
2.047 (51.99 mm) |
| Mks II and III |
Outer |
2.031 (51.5 mm) |
| Fitted length inner: |
|
|
| A |
|
1.517 (38.53 mm) (load 25.3
lb. 11.476 kg) |
| B |
|
1.504 (38.2 mm) (load 26 lb.
11.8 kg) |
| Fitted length outer; |
|
|
| A |
|
1.607 (40.82 mm) (load 54.2
lb. 24.58 kg) |
| B |
|
1.594 (40.49 mm) (load 55.7
lb. 25.2 kg) |
| Mks II and III |
|
Load 67.5 lb. (30.63 kg) |
| Rockers: |
|
|
| Bushes: |
|
|
| A and B |
|
Steel and whitemetal |
| Outside diameter before
fitting: |
|
|
| A and B |
|
.913 (23.17 mm) |
| Inside diameter (reamed
in position): |
|
|
| A and B |
|
.8115 to .8125 (20.62 to
20.65 mm) |
| Clearance: |
|
|
| A and B |
|
.0025 to .0005 (.083 to .012
mm) |
| Bore of arm: |
|
|
| A and B |
|
.909 to .910 (23.076 to
23.101 mm) |
| Valve timing: Marking: |
|
|
| A and B |
|
Adjoining gear teeth marks |
| Chain pitch and number
of pitches: |
|
|
| A and B |
|
.375 (9.525 mm) 62 |
| Rocker clearance for
timing: |
|
|
| A |
|
.0234 (.610 mm) |
| B |
|
.030 (.76 mm) |
| Inlet valve opens: |
|
|
| A |
Mks I and II (to 29F.2285) |
5 deg. BTDC |
| B |
Mk II (from 29F.2286) |
10 deg. BTDC |
| |
MkIII |
16 deg. BTDC |
| Inlet valve closes: |
|
|
| A |
Mks I and II (to 29F.2285) |
45 deg. ABDC |
| B |
Mk II (from 29F.2286) |
50 deg. ABDC |
| |
MkIII |
56 deg. ABDC |
| Exhaust valve opens: |
|
|
| A |
Mk I |
40 deg. BBDC |
| |
Mk II (to 29F.2285) |
51 deg. BBDC |
| B |
Mk II (from 29F.2286) |
45 deg. BBDC |
| |
Mk III |
51 deg. BBDC |
| Exhaust valve closes: |
|
|
| A |
Mk I |
10 deg. ATDC |
| |
Mk II (to 29F.2285) |
21 deg. ATDC |
| B |
Mk II (from 29F.2286) |
15 deg. ATDC |
| |
MkIII |
21 deg. ATDC |
| Valve rocker clearance: |
|
|
| A |
Engine Hot |
.012 (.3 mm) |
| B |
Engine Cold |
.012 (.3 mm) |
| Mks II and III
(Competition) |
|
.015 (.34 mm) |
| Oil pump: |
|
|
| Type: |
|
|
| A |
|
Rotor |
| B |
|
Gear |
| Pressure, running: |
|
|
| A |
|
55 to 60 lb/sq in (3.9 to 4.2
kg/sq cm) |
| B |
|
50 lb/sq in (40 mile/hr)
(3.52 kg/sq cm) |
| Pressure, idling; |
|
|
| A |
|
25 to 30 lb/sq in (1.758 to
2.109 kg/sq cm) |
| B |
|
20 lb/sq in (800 rev/min)
(1.4 kg/sq cm) |
| Release valve spring
length: |
|
|
| A |
|
2.562 (65.09 mm) |
| B |
|
2.687 (68.26 mm) |
| Number of coils: |
|
|
| A and B |
|
13 |
| Diameter: |
|
|
| A and B |
|
.484 +.000 -.015 |
| |
|
(12.30 mm +.000 mm -.318 mm) |
| Oil filter type: |
|
|
| A |
|
Fullflow - Tecalemit |
| B |
|
Fullflow-Tecalemit or
Purolator |
| Oil capacity (including
filter): |
|
|
| A and B |
|
12 3/4 pints (7.25 litres) |
| Flywheel: |
|
|
| Diameter: |
|
|
| A and B |
|
12.8125 (325.45 mm) |
| Number of teeth on
starter ring: |
|
|
| A and B |
|
106 |
| Cooling system: |
|
|
| Type: |
|
|
| A |
|
Pump and thermostat |
| B |
|
Pressurized thermosyphon,
thermostat |
| |
|
control, pump and fan |
| Capacity (without
heater) |
|
|
| A |
|
20 pints (11 litres) |
| B |
|
18 pints (10.2 litres) |
| Thermostat setting: |
|
|
| B |
|
70 C (158 F) |
| Mks II and III
from engine #29F.2592 |
83 C (182 F) |
