| Air cleaner and silencer (single carburettor models) |
| Make |
AC Delco |
| Type |
Rnewable paper element |
| Air cleaner and silencer (twin carburettor models) |
| Make |
Cooper |
| Type |
Rnewable twin elements |
| Auxiliary drive unit |
| Auxiliary drive unit |
Oil pump, distributor and fuel pump |
| Type of drive |
Duplex chain |
| End-float of drive shaft |
0.002 to 0.006 in (0.05 to 0.15 mm) |
| Camshaft |
| Drive |
Two duplex endless chains |
| Diameter of journals |
1.125 in (2.85 mm) |
| Thrust taken |
No.1 bearing cap |
| Camshaft bearings |
| Type |
Shell - steel shell lined with white metal |
| Number of bearings |
6 |
| Bearing clearance |
0.008 to 0.0028 in (0.020 to 0.070 mm) |
| Bearing nip |
0.0015 to 0.0025 in (0.014 to 0.060 mm) |
| Carbuerettor - Single |
| Type |
SU HS6 |
| Needle |
RN |
| Jet size |
0.100 in (2.5 mm) |
| Float level |
1/8 to 3/16 in (3.0 to 4.5 mm) |
| Idling speed |
600/650 rpm |
| Carbuerettor - Twin |
| Type |
SU HD8 |
| Needle |
U1 |
| Jet size |
0.125 in (3.0 mm) |
| Float level |
7/16 (11 mm) in shut-off |
| Idling speed |
700/750 rpm |
| Chains and chainwheels |
| Chain type |
Duplex endless |
| Number of pitches |
|
| Bottom crankshaft to intermediate |
74 |
| Upper intermediate to camshaft |
78 |
| Chain tensioners |
2, Reynolds hydraulic |
| Vibration dampers |
2 |
| Connecting rod |
| Type |
'H' section forging |
| Length between centres |
5.781 in (197.5 mm) |
| Big end bearings |
Detachable, lead-bronze steel shell positioned by tab |
| Bearing clearance |
0.0008 to 0.0023 in (0.020 to 0.058 mm) |
| End-float connecting rod on crankpin |
0.004 to 0.10 in (0.10 to 0.25 mm) |
| Bore diameter of little end bush |
1.000 in (25.40 mm) |
| Connecting rod bearing nip |
0.002 to 0.004 in (0.05 to 0.10 mm) |
| Crankshaft and bearings |
| Balance |
1/3 oz/inches |
| Number of main journals |
5 |
| Width of main journals |
1.375 in (40 mm) |
| Nominal diameter of crank journals: main bearings |
2.5 in (63.50 mm) |
| Nominal diameter of crank journals: big end bearings |
2.0 in (50.80 mm) |
| Width of crankpin |
0.969 in (24.5 mm) |
| Thrust taken |
Thrust washers on No.4 main bearing |
| End-float |
0.002 to 0.006 in (05050 to 0.15 mm) |
| Type |
Lead-bronze steel shell positioned by tab |
| Bearing clearance |
0.001 to 0.0025 in (0.025 to 0.063 mm) |
| Bearing nip |
0.004 to 0.006 in (0.10 to 0.15 mm) |
| Crankshaft damper |
'Holset' Harmonic |
| Cylinder block |
| Type |
Monobloc, integral with crankcase. Stamped Z, A, B, C or D to denote standard piston grade |
| Cylinder reboring limit |
0.040 in (1.00 mm) |
| Flywheel |
| Run-out permissible |
0.002 in (0.05 mm) |
| Number of teeth on starter ring |
93 |
| Markings |
|
| TDC |
When opposite pointer, No.1 piston is at top dead centre. |
| EP |
When opposite pointer, No.1 exhaust valve should be fully open 4 degrees on single carburettor engines and six degrees on twin carburettor engines. When opposite pointer with both valves closed, indicates firing point of No.1 cylinder |
| Oil filter |
| Details |
AC No. 7965022, Type SC |
| Pistons and rings |
| Type |
Bricomatic with combustion chamber in piston crown |
| Standard size |
Graded Z to D |
| Oversize |
0.010 to 0.040 in (0.25 to 1.00 mm) - not graded |
| Clearance in bore measured at bottom of skirt at right angles to gudgeon pin |
0.0015 to 0.0020 in (0.038 to 0.050 mm) |
| Compression rings |
2 |
| Scraper ring |
1 |
| Clearance in groove |
|
| Compression |
0.001 to 0.003 in (0.02 to 0.07 mm) |
| Scraper |
0.001 to 0.003 in (0.02 to 0.07 mm) |
| Gap when fitted |
|
| Compression ring - chrome |
0.019 to 0.024 in (0.45 to 0.60 mm) |
| Scraper ring |
0.014 to 0.019 in (0.35 to 0.48 mm) |
| Taper ring |
0.017 to 0.022 in (0.43 to 0.55 mm) |
| Gudgeon pin outer diameter |
1.000 in (25.4 mm) |
| Fit in little-end bush |
Light push fit |
| Location in piston |
By circlips |
| Tappets |
| Operation |
Camshaft operated direct on to valve tappets |
| Exhaust tappet clearance |
0.013 to 0.015 in (0.33 to 0.38 mm) cold |
| Inlet tappet clearance |
0.008 to 0.10 in (0.250 to 0.25 mm) cold |
| For adjusting clearrance, two shims per valve |
26 sizes. Rnage 0.74 to 0.352 in (1.87 to 8.94 mm) |
| Valves |
| Valve face angle |
|
| Stem diameter |
|
|
| 0.3145 in (7.98 mm) |
0.3415 in (8.67 mm) |
|
| Stem clearance in guide |
|
|
| 0.001 to 0.003 in (0.02 to 0.07 mm) |
0.002 to 0.004 in (0.05 to 0.10 mm) |
|
| Valve stem oil steals |
Robber 'O' ring in valve guides |
| Valve lift |
0.370 in (9.40 mm) |
| Head diameter |
|
|
| 1.654 to 1.650 in (42.01 to 41.9 mm) |
1.341 to 1.337 in (34.0 33.95 mm) |
|
| Valve guides |
| Bore diameter |
|
|
| 0.315 in (8.00 mm) |
0.3438 in (8.73 mm) |
|
| Bore length |
|
|
| 2.525 to 2.531 in (64.13 to 64.28 mm) |
2.525 to 2.531 in (64.13 to 64.28 mm) |
|
| Valve seats |
| Material |
|
| Angle |
|
| Seat width |
|
|
| 0.35 to 0.55 in (0.88 to 1.39 mm) |
0.045 to 0.065 in (1.14 to 1.65 mm) |
|
| Valve springs |
| Type - single carburettor engines |
Inner and outer in pairs, interference fit |
| Type - twin carburettor engines |
Inner and outer, non-interference fit |
| Free length - single carburettor engines |
|
| Free length - inner |
1.960 in (49.78 mm) |
| Free length - outer |
2.190 in (55.60 mm) |
| Active coils - inner |
6 |
| Active coils - outer |
5.5 |
| Fitted length and load - inner |
1.443 in at 32.39 lb + 1.62 lb (36.65 mm at 14.84 mkg + 0.78 mkg) |
| Fitted length and load - outer |
1.827 in at 59.53 lb + 3.00 lb (46.41 mm at 27.00 mkg + 1.36 mkg) |
| Free length - twin carburettor engines |
|
| Free length - inner |
1.921 in (48.79 mm) |
| Free length - outer |
2.27 in (57.66 mm) |
| Active coils - inner |
6 |
| Active coils - outer |
5.5 |
| Fitted length and load - inner |
1.443 in at 32.80 lb + 1.69 lb (36.65 mm at 14.88 mkg + 0.76 mkg) |
| Fitted length and load - outer |
1.827 in at 73.00 lb + 3.65 lb (46.41 mm at 33.10 mkg + 1.66 mkg) |
