Car Repair Manuals

JOWETT SPECS

JOWETT

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The flat-twin Jowett had a remarkable run from 1911 to 1953. Benjamin and William Jowett had already made motorcycles for Alfred Angas Scott, as well as proprietary engines, when they produced their first complete car. This was a true primitive with side tiller steering, fixed cycle-type wire wheels, and armoured wood frame. The starting handle doubled as crankcase breather, but the rest of the car was surprisingly modern; an 816cc pressure-lubricated side-valve flat-twin engine mounted in unit with a cone clutch and a centrally-controlled three-speed transmission; final drive was by worm gear. By the outbreak of war the tiller was replaced with a steering wheel and Jowetts were steel-framed. They boasted not only bevel drive but also detachable steel wheels. Wheelbase was a compact 2133mm (84 inches). A two-seater weighing 391 kg (860 pounds) producing a top speed of 27 km/h (43 mph) sold for £160 ($900).

Shortly after WWI, the Jowetts were still two-seaters, but now they featured Lucas Magdyno electric lighting. In 1921 engines were bored out to increase capacity to 907cc. In 1923, coil ignition was installed.

The cars were incredibly tough, even penetrating the narrow and slippery Bradford-Esholt sewer. Although their reputation was initially confined to Yorkshire, they gained appreciation when they were exhibited at the London and Glasgow shows in 1921. In 1923 Jowett enthusiasts founded Britain's first one-make club.

Production climbed steadily, from 10 to 12 per week in 1922 to 85 by 1929. Until 1928, brakes were not up to the standard of the day with only rear-wheel and transmission brakes. Starters were an optional extra in 1923, but not standardized until 1926. Even the 1929 Jowetts had non-removable cylinder heads which meant that a mechanic had to rotate the unit in the frame and remove the whole cylinder from the bottom end to clean carbon off the underside of the head.

The Long Four of 1923 was a successful attempt to market a full four-seater in the 7 hp taxation class, something never achieved by Austin, whose model Seven was technically an Eight. Wheelbase was 2591mm (102 inches), but track remained at a narrow 1143mm (45 inches). The Jowett was, however, light and it could putter along at an easy 56-64 km/h (35-40 mph) even if the steady beat of the flat-twin engine was not to everyone's liking. The model continued with minimal change until 1929, when some attempt was at last made to improve Jowetts by changing the look of the radiator. The last of the pre-war twins retained mechanical brakes.

7G (1937-38)

Engine
Bore & Stroke 77mm x 101.6mm
Displacement 946cc
Firing order 1,2
Oil pressure (hot) 35 - 40 lb./sq. in.



Fuel Supply
Carburetor Zenith
Choke 23
Main 80
Compensating 80
Economy 130
Slow Running 50



Valving
Intake tappet clearance 0.006" (hot)
Exhaust tappet clearance 0.006" (hot)
Valve-timing indication Sprockets and flywheel
Intake valve opens TDC tappet clearance at 0.012"



Ignition
Breaker gap 0.015"
Plug gap 0.025"
Ignition timing indication Flywheel
Ignition timing TDC (retarded)



Clutch
Clutch type Single Dry Plate
Clutch linings Bonded asbestos



Brakes
Brake type Bendix-Cowdrey Self-servo
Brake linings Bendix-Cowdrey



Wheel Alignment
Toe-In Nil
Camber
Caster angle
King pin angle 8½°


J (1936)

Engine
Bore & Stroke 63.5mm x 92mm
Displacement 1166.4cc
Firing order 1324
Oil pressure (hot) 45 - 50 lb./sq. in.



Fuel Supply
Carburetor Zenith twin
Choke 23
Main 65
Compensating 85
Economy 130
Slow Running 40



Valving
Intake tappet clearance 0.006" (hot) [early 1936, 0.022]
Exhaust tappet clearance 0.006" (hot) [early 1936, 0.022]
Valve-timing indication Sprockets and flywheel
Intake valve opens TDC tappet clearance at 0.012"



Ignition
Breaker gap 0.015"
Plug gap 0.020"
Ignition timing indication Flywheel
Ignition timing TDC (retarded)



Clutch
Clutch type Single Dry Plate
Clutch linings Bonded asbestos



Brakes
Brake type Rod-operated internal expanding
Brake linings Ferodo



Wheel Alignment
Toe-In Nil
Camber 2½°
Caster angle
King pin angle 8½°


7J and 8J (1937-38)

Engine
Bore & Stroke 63.5mm x 92mm
Displacement 1166.4cc
Firing order 1324
Oil pressure (hot) 45 - 50 lb./sq. in.



Fuel Supply
Carburetor Zenith D/D
Choke 24
Main 90
Compensating 85
Economy 150
Slow Running 50



Valving
Intake tappet clearance 0.006" (hot)
Exhaust tappet clearance 0.006" (hot)
Valve-timing indication Sprockets and flywheel
Intake valve opens TDC tappet clearance at 0.012"



Ignition
Breaker gap 0.015"
Plug gap 0.020"
Ignition timing indication Flywheel
Ignition timing TDC (retarded)



Clutch
Clutch type Single Dry Plate
Clutch linings Bonded asbestos



Brakes
Brake type Bendix-Cowdrey Self-Servo
Brake linings Bendix-Cowdrey



Wheel Alignment
Toe-In Nil
Camber
Caster angle 3½°
King pin angle 8½°


Javelin 1½ litre (1947)

Engine
Bore & Stroke 72.5mm x 90mm
Displacement 1486cc
Firing order 1423
Oil pressure (hot) 50 lb./sq. in.



Fuel Supply
Carburetor Zenith 30VM4
Choke 23
Main 90
Compensating 50
Economy 170
Slow Running 45



Valving
Intake tappet clearance Zero lash hyd. tappets, set with 116" clearance when dry
Exhaust tappet clearance Zero lash hyd. tappets, set with 116" clearance when dry
Valve-timing indication Flywheel
Intake valve opens 12° BTDC



Ignition
Breaker gap 0.012"
Plug gap 0.018"
Ignition timing indication Flywheel
Ignition timing TDC



Clutch
Clutch type Single Dry Plate (7¼")
Clutch linings -



Brakes
Brake type Girling Hydraulic (Front & Rear)
Brake linings -



Wheel Alignment
Toe-In Parallel to 18" toe-out, unladen
Camber -
Caster angle -
King pin angle -


Javelin 1½ litre (1948)

Engine
Bore & Stroke 72.5mm x 90mm
Displacement 1486cc
Firing order 1423
Oil pressure (hot) 50 lb./sq. in.



Fuel Supply
Carburetor Zenith 30VM4
Choke 23
Main 90
Compensating 55
Economy 170
Slow Running 50



Valving
Intake tappet clearance Zero lash hyd. tappets, set with 116" clearance when dry
Exhaust tappet clearance Zero lash hyd. tappets, set with 116" clearance when dry
Valve-timing indication Flywheel
Intake valve opens 12° BTDC



Ignition
Breaker gap 0.010" - 0.012"
Plug gap 0.020" - 0.025"
Ignition timing indication Flywheel
Ignition timing 38" ATDC on flywheel



Clutch
Clutch type Single Dry Plate (7¼")
Clutch linings -



Brakes
Brake type Girling Hydraulic (Front & Rear)
Brake linings -



Wheel Alignment
Toe-In Parallel to 18" toe-out, unladen
Camber -
Caster angle -
King pin angle -


Javelin 1½ litre (1949-50)

Engine
Bore & Stroke 72.5mm x 90mm
Displacement 1486cc
Firing order 1423
Oil pressure (hot) 50 - 60 lb./sq. in.



Fuel Supply
Carburetor Zenith 30VM5
Choke 23
Main 90
Compensating 50
Progression 180
Slow Running 45



Valving
Intake tappet clearance Zero lash Set dry (Initial clearance 0.060" - 0.090")
Exhaust tappet clearance same
Valve-timing indication Marks on sprockets and flywheel
Intake valve opens 12° BTDC



Ignition
Breaker gap 0.010" - 0.012"
Plug gap 0.020" - 0.025"
Ignition timing indication Flywheel
Ignition timing 38" ATDC



Clutch
Clutch type Borg & Beck Dry Plate (7¼")
Clutch linings -



Brakes
Brake type Girling Hydro-mechanical
Brake linings -



Wheel Alignment
Toe-In 0" - 18" (toe-out)
Camber Nil
Caster angle
King pin angle 10°


Javelin 1½ litre (1951-52)

Engine
Bore & Stroke 72.5mm x 90mm
Displacement 1485cc
Firing order 1423
Oil pressure (hot) 50 - 60 lb./sq. in.



Fuel Supply
Carburetor Zenith 30VM5
Choke 23
Main 90
Compensating 50
Progression 180
Slow Running 45



Valving
Intake tappet clearance 0.002" (cold)
Exhaust tappet clearance 0.006" (cold)
Valve-timing indication Sprockets and flywheel
Intake valve opens 12° BTDC



Ignition
Breaker gap 0.010" - 0.012"
Plug gap 0.020" - 0.025"
Ignition timing indication Flywheel
Ignition timing 38" ATDC



Clutch
Clutch type Borg & Beck Dry Plate
Clutch linings -



Brakes
Brake type Girling Hydraulic
Brake linings -



Wheel Alignment
Toe-In 0" - 18" (toe-out)
Camber Nil
Caster angle
King pin angle 10°


Javelin 1½ litre (1953)

Engine
Bore & Stroke 72.5mm x 90mm
Displacement 1485cc
Firing order 1423
Oil pressure (hot) 50 - 60 lb./sq. in.



Fuel Supply
Carburetor Zenith 30VM5
Choke 23
Main 90
Compensating 50
Progression 180
Slow Running 45



Valving
Intake tappet clearance 0.003" (cold)
Exhaust tappet clearance 0.006" (cold)
Valve-timing indication Sprockets and flywheel
Intake valve opens 12° BTDC



Ignition
Breaker gap 0.014" - 0.016"
Plug gap 0.020" - 0.025"
Ignition timing indication Flywheel
Ignition timing 38" ATDC



Clutch
Clutch type Borg & Beck Dry Plate
Clutch linings -



Brakes
Brake type Girling Hydraulic
Brake linings -



Wheel Alignment
Toe-In 0" - 18" (toe-out)
Camber Nil
Caster angle
King pin angle 10°


Jupiter Mark 1A (1953)

Engine
Bore & Stroke (2.855") 72.5mm x (3.545") 90mm
Displacement 1485cc
Firing order 1423
Oil pressure (hot) 65 - 70 lb./sq. in.



Fuel Supply
Carburetor Twin Zenith 30VM
Choke 27mm
Main 115
Compensating 60
Progression 120
Slow Running 45



Valving
Intake tappet clearance 0.003" (cold)
Exhaust tappet clearance 0.006" (cold)
Valve-timing indication Sprockets and flywheel
Intake valve opens 12° BTDC



Ignition
Breaker gap 0.014" - 0.016"
Plug gap 0.020" - 0.025"
Ignition timing indication Flywheel
Ignition timing 38" ATDC



Clutch
Clutch type Borg & Beck Dry Plate (7¼)
Clutch linings Woven yarn



Brakes
Brake type Girling Fully Hydraulic
Brake linings 316" thick x 8¾ long



Wheel Alignment
Toe-In 0" - 18" (toe-out)
Camber
Caster angle
King pin angle 10°


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