Tune-Up - Diesel Isuzu Trooper I

ENGINE IDENTIFICATION

Engine serial number is stamped on front part of cylinder block near water pump.

ENGINE CODES

ENGINE COMPRESSION

1. Warm engine to normal operating temperature. Remove sensing resistor, glow plug connectors, glow plugs and fuel cut solenoid connector. Disconnect fusible link wire of "Quick Start" system at harness connector.
2. Install Compression Gauge Adapter (J 29762) and compression gauge. Operate starter and read compression at 200 RPM.

COMPRESSION SPECIFICATIONS

VALVE CLEARANCE

1. Rotate crankshaft until No. 1 piston is at TDC of compression stroke. Measure valve clearance between adjusting screw and valve stem end cap. With No. 1 piston at TDC, adjust intake valves on cylinders No. 1 and 2 and exhaust valves on cylinders No. 1 and 3.
2. Rotate crankshaft one complete revolution until No. 4 piston is at TDC of compression stroke. Adjust intake valves on cylinders No. 3 and 4 and exhaust valves on cylinders No. 2 and 4.

VALVE CLEARANCE SPECIFICATIONS

VALVE ARRANGEMENT

1. E-I-I-E-E-I-I-E (Front-to-rear).

Scheme 1

Scheme 2

1. Ensure line on injection pump flange is aligned with line on injection pump front bracket. Bring piston in No. 1 cylinder to TDC of compression stroke. With timing belt cover removed, ensure timing belt is properly tensioned and timing marks are aligned.
2. Disconnect injection pipe from pump. Remove distributor head screw and gasket. Install Dial Indicator (J 28827) on pump. Adjust lift to approximately .04" (1 mm). Bring piston in No. 1 cylinder to a point 45-60 degrees BTDC.
3. Calibrate dial indicator to Zero. Turn crankshaft (in direction of normal rotation) until 15 degrees BTDC (13 degrees BTDC for Calif. models) notch on damper pulley is in alignment with pointer. Read dial indicator.
4. Dial indicator reading must be .020" (.5 mm). If reading is not within specifications, hold crankshaft at 15 degrees BTDC (13 degrees BTDC for Calif. models). Loosen nuts on injection pump flange. Move injection pump until dial indicator reading is .020" (.5 mm)

IDLE SPEED

1. Set parking brake, block drive wheels and place transmission in "NEUTRAL" or "PARK". With A/C off (if equipped) and air cleaner installed, start engine and run until normal operating temperature is reached.
2. Connect tachometer and check idle speed. If idle speed is correct, loosen idle speed adjusting screw lock nut and turn adjusting screw to reach correct idle speed. Tighten lock nut.

IDLE SPEED SPECIFICATIONS

Scheme 3

1. Start engine and run until normal operating temperature is reached. Connect Tachometer (J 28885). Disconnect hose Nos. 1 and 2 from vacuum switch valve. (Scheme 3) Connect hoses together using a pipe or tube.
2. Check fast idle speed. If fast idle speed is incorrect, loosen adjusting lock nut 4. (Scheme 4) Adjust screw.

Scheme 4

FAST IDLE SPEED SPECIFICATIONS

EMISSION CONTROL

See EMISSIONS Section.

Fuel Injection

All Isuzu diesel models use Bosch mechanical diesel fuel injections

BATTERY

BATTERY SPECIFICATIONS

STARTER

All Isuzu diesel models use Hitachi starters.

STARTER SPECIFICATIONS

ALTERNATOR

All Isuzu diesel models use Hitachi alternators.

ALTERNATOR SPECIFICATIONS

ALTERNATOR REGULATOR

All Isuzu diesel models use Hitachi alternator regulators.

REGULATOR OPERATING VOLTAGE @ 68°F (20°C)

SERVICE INTERVALS

REPLACEMENT INTERVALS

BELT ADJUSTMENT

BELT ADJUSTMENT

CAPACITIES

FLUID CAPACITIES