Isuzu KB P190. Manual - part 210

ENGINE MECHANICAL   6A – 35 

Idling Speed Adjustment

 

1.  Loosen the idling set screw lock nut 

c

 on the injection 

pump idling set bolt. 

2.  Adjust the idling speed to the specified range by 

turning the idling set bolt 

d

. 

3.  Lock the engine set nut 

c

 with the idling set bolt lock 

nut. 

4.  Check that the idling control cable is tight (free of 

slack). If required, remove the slack from the cable. 

Fast Idling Speed Inspection 

1.  Set tachometer to the engine. 

2.  Disconnect the vacuum hose 

c

 from the fast idle 

actuator 

g

 on the injection pump. 

3.  Disconnect the other vacuum hose 

d

 from the 

vacuum switching valve 

e

 and connect it to the fast 

idle actuator 

g

. 

The vacuum line will now be connected directly from 
the vacuum pump 

f

 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 

 

 

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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. 

 

 

 

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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.. 

 

 

 

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