Humber Hawk Mark III to V
| 1948 to 1954 | |
|---|---|
 | |
| Production | 1948 to 1954 |
| Total built | 10,040 (III) 6,492 (IV) 14,300 (V) |
| Body style | 4-door saloon,Limousine (Mk V only) |
| Engine | 1944 cc Straight-4 side-valve (Mk III) 2267 cc Straight-4 side-valve (Mk IV & V) |
| Transmission | 4-speed manual |
| Wheelbase | 105.5 inches (2678 mm) |
| Length | 174 inches (4420 mm) |
| Width | 70 inches (1778 mm) |
| Height | 64.75 in (1,645 mm) |
The Humber Hawk Mark III to Mark V (Mark 3 to Mark 5) was introduced in 1948 untill 1954 by the British company Humber .
History
In October 1948 the Hawk Mark III was introduced. The newly developed car in pontoon form, whose body had been designed by Raymond Loewy, had a new separate frame with cross bracing and the engine of the predecessor. The front wheels were individually suspended on double wishbones with coil springs. The rear rigid axle had also been revised and an axle drive with hypoid gearing was used. The body of the sedan was optionally available in two-tone or metallic paint.
The Mk III Hawk was a completely new car and was first shown at the London Motor Show in October 1948, but it still retained the earlier engine and transmission. The new body was styled by the Loewy Studio and the separate headlights of the old model were gone, along with the separate front wings. The chassis was new, with coil-sprung independent front suspension. The rear axle was also a new design with hypoid gearing. The body could be finished in a wide range of colours, both as two-tone and metallic. The metallic finishes would be offered on all the Hawks until the model's demise in late 1967/early 1968.
By 1950, 10,040 copies of the Hawk Mark III were built.
Humber Hawk chassis from 1951
Hawk Mark IV (1950-1952)
The new Hawk Mark IV appeared in 1950 The body of the sedan remained unchanged. By 1952 had an engine with an enlarged cylinder bore and a displacement of 2267 cc. The power increased only slightly by 2 bhp (1.5 kW). The engine now had an aluminum cylinder head and the wheels were enlarged to 15″ and the steering ratio increased. The car weighed 1358 kg, 53% of which was on the front axle.
6492 copies were built
1951 Humber Hawk engine bay
Hawk Mark V (1952-1954)
The Hawk Mark V was mechanically unchanged in 1952 . Only the front was slightly revised, the trunk lid was a bit flatter and bumpers were wrapped around the corners of the vehicle with over-riders distinguished this model from the Mk IV. In addition to the sedan, a Pullman sedan was offered available as a "luxury touring limousine".
By 1954, 14,300 Mark V cars were made.
Description
Technical
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Humber Hawk Mark III-V Technical details and specifications (1948-1954)
Humber Hawk Mark III
ENGINE.1,944cc
No. of Cylinders -4
c.c. -1,944
B.H.P. 56 at, 3,800 r.p.m.
Bore -75 mm.
Stroke -110 mm.
Compression Ratio -6.41 to 1
System of Cooling -Pump, Fan and Thermostot
Firing order - 1-3-4-2 -
No. of compression ring -2
Width of comp. rings -.0938in.—.0933in.
No. of oil rings -1
Width of oil rings -.1875—.1865in.
Oil pressure, lb. sq. in. 45—50 -
Gudgeon pin type -1.94in. -
Camshaft drive (type)-Roller Chain
Valve timing markings - 1—4 Mark on Flywheel gives T.D.C. on No. 1 Piston
Exhaust Valve diam.Head and Stem -1.309in. and .3117in.
Inlet Valve diam.—Head and Stem -1.388in. and .3117in.
Tappet type -Barrel
Carb. make and type -Stromberg D.B.A .D/Draught
Venturi -.97
By-pass Jet -.026
Metering Jet -.004
Idling setting -68
Progression setting -54CLUTCH AND GEAR BOX
Clutch type -Borg and Beck Single Dry Plate 8in.
Gear ratio, top (overall) ... 4.55 : 1
Gear ratio, third 6.78 : 1
Gear ratio, second 11.24 : 1
Gear ratio, first, 16.19 : 1
Gear ratio, reverse 21.62 1FRONT AXLE AND STEERING
Camber -0° 45'
Caster angle -0°
Toe-in -.125in.
King pin inclination -8° 15'
Track -56.00in.
Turning circle -37ft. Oin.
Wheelbase -105.5in.REAR AXLE.
Type of axle -Semi-floating
Type of drive -Hypoid
Ratio or No. of teeth -4.55 to 1
Adjustment -Shims for Pinion and Diff. Bearing
End play—ins. - Nil
Lash—ins. -.006—.010in.BRAKES.
Type -Lockheed 2LS Hydraulic 9in. Drums
Type of linings -Ferodo MR19
Lining size—Front -9 1/2x 1 3/4in.
Lining size—Rear -9 1/2x 1 3/4inSPRINGS.
Type -Front, Coil ; Rear, Semi-Elliptic
Length—Front -(Free) 14.59in.
Diam.—Front -4 1/2in.
No. of Coils—Front -12
Diam. of -.550in.
Length—Rear (Laden centres) 52in.
Width—Rear -2in.
No. of leaves—Rear -8
Thickness Of leaves—Rear -No. 5 B.W.G.
Camber—Rear -(Free) 4.90in.ELECTRICAL.
Distributor rotation -Clockwise
Manual advance -Rotation of Body
Automatic advance -Vacuum and Centrifugal
Charging system -c.v.c.
Battery—Capacity and make, type -12v. X 51A.H. Lucas
Battery earth—pos. or neg - PositiveGENERAL DIMENSIONS
Overall Length -14ft. 6in.
Overall Height -5ft. 41/2in.
Overall Width -5ft. 10in.
Ground clearance -6.68in.
Total weight (Dry) -2,652 1b© Motor car History
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Humber Hawk Mark III-V maintenance and Service Guide (1948-1954)
Humber Hawk Mark III Engine 1,944cc
Distributor Breaker gap -.010—.012in.
Ignition timing—degree -4° B.T.D.C.
Ignition timing—No. Mark on Flywheel to be 3/8in. before Mark on Engine Plate
Plug make and type- Champion L 10. 14 mm.
Plug gap -.028—.032in
Firing order -1-3-4-2
Tyre size and pressures -5.50 x 15in.: Front, 26 1b. Rear, 28 1bInlet Valve Clearance for timing -.014in.
Inlet Valve working clearance -.010in. cold
Exhaust Valve working clearance -.010in. cold -
CAPACITIES.
Sump-10 pints
Gear Box—2 pints
Rear Axle—1 3/4in.
Cooling system - 16.50 pints
Radiator hose (top) 6.00 X 1 3/8in.
Radiator hose (botton) -6.00 X 1 3/8in.
Petrol tank-10 galls© Motor car History
