GENERAL INFORMATION
MAIN DATA AND SPECIFICATIONS
6
Engine Model
A-4JA1 A-4JB1 4JB1T
Item
Engine type Water cooled, four-cycle, in-line, overhead valve
Combustion chamber type Direct injection
Cylinder liner type Dry
No. of cylinders - Bore x Stroke mm(in.) 4 - 93.0 x 92.0 4 - 93.0 x 102.0 4 - 93.0 x 102.0
(3.66 x 3.62) (3.66 x 4.02) (3.66 x 4.02)
Total piston displacement lit(cid) 2.449 (152.4) 2.771 (169.0) 2.771 (169.0)
Compression ratio (To 1) 18.4 18.2 18.2
*Engine dimensions mm(in.) 805 x 625 x 729 739 x 625 x 746 578 x 771 x 577
Length x Width x Height (31.7 x 24.6 x 28.7) (29.1 x 24.6 x 29.4) (22.8 x 30.4 x 22.7)
*Engine weight (Dry) kg(lb.) 218 (480) 220 (486) 245 (540)
Fuel injection order 1 – 3– 4 – 2
*Fuel injection timing (B.T.D.C.) degrees 14
Specified fuel Diesel fuel
Injection pump In-line plunger, Bosch A type Bosch distributor
VE type
Governor Variable speed mechanical type
*Low idle speed rpm 850 – 1,000
Injection nozzle Multi-hole type
Injection starting pressure kgf/cm
2
(psi/MPa) 185 (2630/18.1)
Fuel filter type Cartridge papaer element
Water sedimentor (if so equipped) Sediment/water level indicating type
Compression pressure kgf/cm
2
(psi/MPa) 31 (441/3.04)
Valve clearance (at cold) Intake mm(in.) 0.40 (0.0157)
Exhaust mm(in.) 0.40 (0.0157)
Lubrication method Pressurized circulation
Oil pump Trochoid type
Main oil filter type Cartridge paper element, full flow
Partial oil filter Not equipped
*Lubricating oil volume lit.(qts) 5.5 (5.8) – 6.6 (7.0) 4.6 (4.9) – 6.4 (6.8) 4.6 (4.9) – 6.3 (6.7)
Oil cooler (if so equipped) Water cooled built in oil filter
Cooling method Pressurized forced circulation
Coolant volume lit.(qts) 5.0 (5.3)
Water pump Belt driven impeller type
Thermostat type Wax pellet type
*Alternator V-A 12 – 35
*Starter V-kW 12 – 2.2
Specifications marked with an asterisk (*) will vary according to engine application.
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