2004 ISUZU TF SERIES engine

ENGINE MECHANICAL 6A – 35
Fast Idling Speed Inspection
1. Set tachometer to the engine.
2. Disconnect the vacuum hose

from the fast idle
actuator
 on the injection pump.
3. Disconnect the other vacuum hose
 from the
vacuum switching valve
 and connect it to the fast
idle actuator
.
The vacuum line will now be connected directly from
the vacuum pump
 to the fast idle actuator.
4. Check the engine fast idling speed.
If the engine idling speed is outside the specified
range, it must be adjusted.
Fast Idling Speed rpm
850  25

Fast Idling Speed Adjustment
1. Loosen the fast idle actuator bracket bolts.

2. Adjust the fast idling speed by moving the actuator
bracket, so that the clearance “S” can be 1 ~ 2 mm
(0.04 ~ 0.08 in.).
3. Tighten the bracket bolts.


Accelerator Control Cable Adjustment
Refer to Sec. 6H-6 (Accelerator Control)

6A – 36 ENGINE MECHANICAL
GENERAL DESCRIPTION









RTW46AMF000401

The 4J series automotive diesel engine has special designed combustion chambers in the piston. This design
provides superior fuel economy over a wide range of driving conditions.
Auto-thermatic pistons with cast steel struts are used to reduce thermal expansion and resulting engine noise when
the engine is cold.
Chrome plated dry type cylinder liners provide the highest durability.
The laminated steel sheet cylinder head gasket is very durable and, to increase the head gasket reliability.
The crankshaft has been tufftrided to provide a longer service life. Because the crankshaft is tufftrided, it cannot be
reground.
The 4JA1T(L) engine is equipped with the BOSCH VE-Type distributor injection pump.
The 4JH1TC and 4JA1TC engine is equipped with the BOSCH VP44-Type distributor injection pump.
The engine is turbocharger equipped.

ENGINE MECHANICAL 6A – 37

REMOVAL AND INSTALLATION
Read this section carefully before performing any removal and installation procedure. This section gives
you important points as well as the order of operation. Be sure that you understand everything in this section before
you begin.


Removal

P1010011
1. Battery
1) Disconnect the battery cable and the grounding cable from the battery terminals.
2) Remove the battery clamp. Take care not to accidentally short the battery with the wrench or some
other tool.
3) Remove the battery.
4) Disconnect the battery cable at the starter motor and the ground cable at the cylinder body.



2. Engine Hood Apply setting marks to the engine hood and the engine
hood hinges before removing the engine hood. This will
facilitate reinstallation of the engine hood to its original
position.



3. Supporting the Vehicle 1) Jack up the vehicle.
2) Place chassis stands at the front and the rear of the vehicle.


4. Under cover (for 4x4 model) 5. Rear propeller shaft 1) Remove the propeller shaft flange yoke at the rear differential.
2) Remove the center bearing retainer bolts.
3) Remove the propeller shaft together with the center bearing from the transmission mainshaft spline.


F06R300006 P1010002

6A – 38 ENGINE MECHANICAL
6. Front propeller shaft (for 4x4 model)
Remove the spline yoke flange bolt at the transfer output
shaft.
Do not allow the spline yoke to fall away from the front
propeller shaft.
If the spline yoke should fall away from the front propeller
shaft, align the setting marks on the spline yoke and the
propeller shaft to reassemble the two marks. The setting
marks are punched circles approx. 3mm (0.12 in) in
diameter.

7. Clutch slave cylinder (for M/T model)
8. ATF pipe (for A/T model)
9 Shift control cable (for A/T model)
10. Transmission sensor harness
Remove the vehicle speed sensor connector, inhibitor
switch connector (A/T), ATF temperature sensor
connector, back up light switch connector (M/T) from
transmission.
11. Breather hose (for A/T model)
12. Transmission shift lever (for M/T model)
Remove the shift lever from the floor.
13. Transfer shift lever (for 4x4 model)
Remove the shift lever from the floor.

14. Transmission member
1) Support the transmission with the transmission jack.
2) Remove the transmission member mounting bolts
fixing the transmission member to the chassis frame.


15. Torque converter bolt (for A/T model)
1) Remove the under cover under the torque converter
housing.
2) Rotate the flywheel by using tire lever or some other
tool, and then remove the torque converter bolts.
16. Transmission coupling bolt
1) Support the engine with the garage jack.
2) Use the jack to slightly lower the transmission.
3) Remove the transmission coupling bolts.
17. Transmission (and transfer)
Separate the transmission (and transfer) from the
engine.Take care not to damage the transmission, the
engine, and their related parts..

F06R300007 P1010025

ENGINE MECHANICAL 6A – 39

18. Radiator
1) Drain the engine coolant.
2) Remove the reservoir hose.
3) Remove the upper and lower hose.
4) Remove the fan guide.
5) Remove the radiator.


19. Fan

P1010034
20. Air cleaner
1) Remove the MAF sensor connector (4JA1TC/4JH1TC) from air cleaner duct.
2) Remove the air cleaner duct and the air cleaner box from engine room.
3) Remove the two air ducts from inter cooler (4JA1TC/4JH1TC).

21. Power Steering Pump Loosen the power steering pump adjust plate bolt, then
remove the power steering pump assembly. Place the
power steering pump assembly along with piping on the
body side.
22. Air conditioner compressor 1) Remove air compressor magnet connector.
2) Remove the air conditioner compressor. Place the air conditioner compressor along with piping on the body
side.
23. Engine Control Cable Remove the engine control cable from its bracket
(4JA1TC/4JH1TC) or the injection pump (4JA1T(L)).

24. Vacuum Piping Remove the vacuum pipe from the vacuum pump, the
EGR valve, injection pump FICD (4JA1T(L)).

25. Engine Harness 1) Remove following connectors from engine.

TPS connector

Oil pressure switch connector

Thermo switch connector

Injection pump connector

Engine earth

Thermometer unit connector

TDC sensor
2) Remove the clips fixing engine harness.
P1010009

6A – 40 ENGINE MECHANICAL
140R300001
26. Fuel Hose
Remove the fuel hose from the fuel filter (Except EURO
III).





RTW46ASH000501
Remove the fuel hose from injection pump (EURO III
only).

27. Exhaust Pipe
Remove the front exhaust pipe bolts and separate the
exhaust manifold and the front exhaust pipe.

28. Engine Assembly
1) Remove two right side engine foot bolts.
2) Remove two left side engine mount bolts.
3) Use the hoist to lift the engine from the engine
compartment.






Installation
To reassemble, follow the removal steps in the reverse
order.


022R300002
F06R300008

ENGINE MECHANICAL 6A – 41

















































Coolant Replenishment
Warning:
When the coolant is heated to a high temperature, be
sure not to loosen or remove the rediator cap.
Otherwise you might get scalded by hot vapor or
boiling water.
To open the radiator cap, put a piece of thick cloth on
the cap and loosen the cap slowly to reduce the
pressure when the coolant has become cooler.
1. Open rediator cap pour coolant up to filler neck
2. Pour coolant into reservoir tank up to "MAX" line
3. Tighten radiator cap and start the engine. After idling
for 2 to 3 minutes, stop the engine and reopen radiator
cap. If the water level is lower, replenish.
4. After replenish the coolant tighten radiator cap, warm
up the engine at about 2000 rpm. Set heater
adjustment to the highest temperature position, and let
the coolant circulate also into heater water system.
5. Check to see the thermometer, continuously idling 5
minutes and stop the engine.
6. When the engine has been cooled, check filler neck for
water level and replenish if required. Should extreme
shortage of coolant is found, check the coolant system
and reservoir tank hose for leakage.
7. Pour coolant into the reservoir tank up to "MAX" line.

Coolant Capacity lit (US/UK gal)

4JA1 / TC 9.4 (2.5 / 2.1)
4JH1TC M/T: 10.1 (2.7 / 2.2)
A/T: 10.0 (2.6 / 2.2)

9.5 (2.5/2.1)
























Engine Warm-Up
After completing the required maintenance procedures,
start the engine and allow it to idle until it is warm.
Check the following:
1. Engine idling speed.
2. Engine noise level.
3. Engine lubricating system and cooling system.
Carefully check for oil and coolant leakage.
4. Clutch engagement.
5. Transmission operation.
6. Indicator warning light operation.

6A – 42 ENGINE MECHANICAL

ENGINE REPAIR KIT





RTW36ALF000601

Removal Steps
1. Cylinder head gasket
2. Head cover gasket
3. Head cover cap nut gasket
4. Drain cock gasket
5. Crankshaft rear oil seal
6. Gear case gasket
7. Oil pan drain plug gasket
8. Oil pan gasket
9. Oil filter gasket
10. Joint bolt gasket 11. Vacuum pump gasket
12. Water pump O-ring
13. Water outlet pipe gasket
14. Intake pipe gasket
15. Thermostat housing gasket
16. Intake manifold gasket
17. Exhaust manifold gasket
18. Nozzle holder O-ring
19. Nozzle holder gasket
20. Crankshaft front oil seal

NOTE
Discard all O-rings, gaskets, and seals removed at disassembly and replace them with new ones. Reuse of
these parts will result in oil, water, and gas leakage.