Commer Superpoise

Commer Superpoise truck Technical details and specifications (1939-1961)

ENGINE: Petrol 6 Cylinders 3180.9cc. (early)
No. of Cylinders-6
Treasury Rating- 20.92 hp
cubic capacity- 3180.9 c.c.
B.H.P.- 66 at 3,250 r.p.m.
Bore- 75 mm. (2.95in.)
Stroke- 120 mm. (4.72in.)
Compression Ratio- 5.7 to 1
1st O.S. Bore- + .010in.
Max. O.S. for boring- + .040in.
Firing order- 1-5-3-6-2-4
Piston clearance top- .0025in.
Piston clearance bottom- .0025in.
Ring Gap- .010in. to .014in.
No. of compression rings- 2
No. of oil rings- 2
Oil pressure, lb.sq.in- 45 to 50 (Engine warm)
Gudgeon pin type- Hollow, hardened and ground
Fit in piston- Tight, circlip located
Fit in con. rod- Running
Crankpin diameter(standard)- 54 mm.
End clearance- .006in. to .004in.
Diam. clearance- .002in
No. of crankshaft bearings- 4
Type of bearing (Crankshaft)- White Metal ('Babbit") bonded to rod
Standard main journal diameter-65 mm.
No. of camshaft bearings- 4
Type of bearing (Camshaft)- Detachable, steel back,
Camshaft drive (type)- "Duplex" roller chain
Valve timing markings-Punch marks on chain sprockets and T.D.C. mark on flywheel
Exhaust Valve diameter-35 mm.
Inlet Valve diameter-39 mm.
Are guides removable?- Yes
Carburettor make- 'Solex" 35 mm.F.A.I.
Choke setting- 25 mm
Main setting- 135

TRANSMISSION DRIVE LINE

Clutch type- : 11in. ventilated, single, dry plate
Type of facing-
Gear ratio, top- Direct
Gear ratio, third- 1.788 to 1
Gear ratio second- 3.366 to 1
Gear ratio, first- 6.414 to 1
Gear ratio, reverse- 8.246 to 1

AXLE & STEERING:

FRONT AXLE:
Camber- 2°
Caster angle- 3° 20'
King Pin inclination- 8°
Track- 1.5 Ton, 5ft. 6in.; 2 & 3 Ton, 5ft. 5in.
Turning circle- Short W.B 38ft; Long w.B. 47ft.
Wheel base- Short, 10ft.; Long, 12ft. 9in.

REAR AXLE:
Type of axle- Fully. Floating
Type of drive- Spiral Bevel
Ratio- 1.5 & 2 Ton, 6.00 to 1; 3 Ton, 6.57 to 1
Adjustment- Shims for pinion bearings; screwed adjusters for diff. & wheel bearings

BRAKES:
Type- Cowdrey hydraulically operated
Type of linings- Moulded

SPRINGS:
Type- Semi-elliptic, progressive
Length—Front- 36in.
Width—Front- 2.1/4 in.
No. of leaves—Front 3
Length—Rear- 46in.
Width—Rear- 2 1/2 in
No. of leaves—Rear- 1.5 Ton, 11.; 2 & 3 Ton, 13

ELECTRICAL:
Distributor rotation- Clockwise, viewed from driving end
Automatic advance- Suction 7°. Centrifugal 10°
Battery type- 12 V. 63 amp. hr.
Battery earth—pos. or neg- Positive

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Commer 5-ton Superpoise (Late trucks).

Engine Rootes ' Superpoise " petrol or Perkins " Six-354 " Diesel fuel injection.
Number of cylinders 6.
Cubic capacity 4.139 litres (petrol)
Cubic capacity 5.8 litres Diesel (fuel injection).
B.H.P. 91 (petrol),
B.H.P. 108 Diesel (fuel injection).
Overall length 24 ft.
Overall width 7 ft. 41 in.
Hejght (to top of cab) 6 ft. 9 in.
Turning circle 57 ft.
Wheel-base 14 ft. in.
Track 5 ft. 6} in. (front), 5 ft. 7 in. (rear).
Fuel tank capacity 16 gallons.
Gross weight 81 tons.

Commer Superpoise truck Maintenance and Service Guide (1939-1961)

ENGINE: Petrol 6 Cylinders 3180.9cc.
Inlet Valve Clearance for timing-
Inlet Valve opens—degs- 9° B.T.D.C.
In. Valve opens- 27 mm. B.T.D.C. measured on flywheel periphery
In. Valve opens—piston traverse- .037in. B.T.D.C.
Inlet Valve working clearance- .012in.
Exhaust Valve working clearance- .014in.

CAPACITIES:
Sump pints- 14 (7.95 litres)
Gear Box pints- 7 (0.98 litres)
Rear Axle 'pints- 11 (6.26 litres)
Petrol galls 16

Breaker gap- .012in.
Plug make- Champion, 14 mm.
Plug gap-.032in.
Firing order- 1-5-3-6-2-4
Ignition timing-T.D.C. fully retarded

Tyre size- 2 Ton, 6.00 x20in. Twin Rear; 3 Ton, 32 x 6in
Axle Adjustment- Shims for pinion bearings; screwed adjusters for diff. & wheel bearings

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