2007 ISUZU KB P190 compression ratio

HEATER AND AIR CONDITIONING 1-91
RESULT SYMPTOM TROUBLE CAUSE CORRECTION
Reduced or no air flow through
the condenser
•
Condenser clogged or dirty
• Radiator (condenser) fan
does not operate properly •
Clean
• Check cooling fan
operation
No bubbles in sight glass when
condenser is cooled by water
(Insufficient cooling)



•
Excessive refrigerant in
system




•
Check sight glass.
(See “Reading Sight
Glass”)
• Discharge and
recover refrigerant.
Recharge to specified
amount
Discharge
(High)
pressure
gauge
abnormally
high
After stopping air conditioning,
pressure drops approx. 196 kPa
(2.0kg/cm
2 / 28psi) quickly •
Air in system
•
Evacuate and charge
refrigerant system
Insufficient cooling and excessive
bubbles in the sight glass





•
Insufficient refrigerant in
system





•
Check sight glass.
(See “Reading Sight
Glass”)
• Check for leaks
• Discharge and
recover refrigerant.
Recharge to specified
amount
Low pressure gauge indicates
vacuum •
Clogged or defective
expansion valve •
Replace the
expansion valve
Frost or dew on refrigerant line
before and after receiver/ drier or
expansion valve, and low pres-
sure gauge indicates vacuum •
Restriction caused by debris
or moisture in receiver/drier

•
Check system for
restriction and
replace receiver/drier

Discharge
(High)
pressure
gauge
abnormally
low
After turning off air conditioning,
high and low pressure gauge
balanced quickly
•
Compressor seal defective
• Poor compression due to
defective compressor
gasket •
Replace or repair
compressor
Low pressure gauge is lowered
after condenser is cooled by
water
•
Excessive refrigerant in
system

•
Discharge and
recover refrigerant
Recharge to specified
amount
Low pressure hose temperature
around the compressor refrigerant
line connector is lower than
around evaporator

•
Unsatisfactory valve
operation due to defective
temperature sensor of
expansion valve
• Expansion valve opens too
long •
Replace the
expansion valve




After turning off air conditioning,
high and low pressure gauge is
balanced quickly •
Compressor gasket is
defective
•
Replace


Suction
(Low)
pressure
gauge
abnormally
high
Air conditioning turns off before
passenger compartment is
sufficiently
cool •
Electronic thermostat
defective
•
Check the electronic
thermostat and
replace as necessary


* For the charging and discharging operations in the table above, refer to “RECOVERY, RECYCLING,
EVACUATION AND CHARGING” in this section.

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ISUZU KB P190 2007

4C1-58 FRONT WHEEL DRIVE





Important Operations
1. Spacer
Apply grease to both faces of spacer.
4. Inner Assembly
Apply grease wheel bearing to inside face of ring.
g(oz)

Amount of grease 6 (0.21)



7. Knob
( 1 ) Apply grease W heel bearing to outer circumference of knob
and inner circumference of cover.
(2) Align detent ball to either groove of cover.





8. Snap Ring
Turn the smoother face to knob side.
9. Retaining Spring
Align the end of spring to the end of cut portion of clutch spring
groove.




10. Follower
Install follower to clutch so that follower nail will come closer to
the bent portion of retaining spring by aligning follower stopper
nail to outer teeth of clutch. Then, hook retaining spring onto
upper portion of hanger nails of follower.





11. Compression Spring
Turn the smaller diameter side to follower.
12. Clutch Assembly
Align follower nail to handle groove, and then assemble clutch
with knob by pushing and turning clutch counterclockwise to
knob.


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ISUZU KB P190 2007

6A – 4 ENGINE MECHANICAL
MAIN DATA AND SPECIFICATIONS
Engine model
Item 4JA1T (L)
4JA1TC
Engine type
Combustion chamber type
Cylinder liner type
Timing gear train system Four-cycle, overhead valve, water cooled
Direct injection
Dry type, chrome plated Gear drive
No. of cylinders-bore × stroke mm (in) 4 – 93 × 92 (3.66 × 3.62)
No. of piston rings Compression ring: 2 / Oil ring: 1
Total piston displacement cm3 (in3)
Compression ratio (to 1) 2,499 (152.4)
18.5
Compression pressure MPa (kg/cm2/psi) 3.0 (31.0/441) – 200 rpm
Engine weight (dry) kg (lb)Approximately 239 (527)
Fuel injection order 1 – 3 – 4 - 2
Fuel injection timing BTDC deg8 -
Specified fuel type
Idling speed rpm

Valve clearances (At cold): Intake mm (in)
Exhaust mm (in)
Intake valves Open at (BTDC) deg
Close at (ABDC) deg
Exhaust valves Open at (BBDC) deg
Close at (ATDC) deg
Fuel system JIS No. 2, DIN/EN590, GB252-1944 Diesel fuel
730 ± 25 (A/C Off)
780 ± 25 (A/C ON)
0.4 (0.016)
0.4 (0.016) 24.5
55.5
54.0
26.0

Injection pump type BOSCH distributor VE type BOSCH distributor VP44 type
Governor type Mechanical (Half all speed
type) Electronically controled
Injection nozzle type
Injection nozzle opening pressure Hole with 5 orifices

MPa (kg/cm2/psi) 1st 19.1 (195 / 2,773) 1st 19.0 (194 / 2,755)
2nd (Reference)
25.5 ∼27.0
(260 ∼275 / 3,702 ∼3,920) 2nd (Reference)
34.0 ∼35.5
(347 ∼362 / 4,936 ∼5,154)
Main fuel filter type
Lubricating system
Lubricating method Cartridge paper element and water separator

Pressure circulation
Specified engine oil (API grade) ISUZU genuine 10W – 30 (API CD of ACEA B2/B3)

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ISUZU KB P190 2007

6A – 6 ENGINE MECHANICAL
MAIN DATA AND SPECIFICATIONS
Engine model
Item 4JH1TC
Engine type
Four-cycle, overhead valve, water cooled
Combustion chamber type Direct injection
Cylinder liner type
Timing gear train system Dry type, chrome plated
Gear drive
No. of cylinders-bore × stroke mm (in) 4 – 95.4 × 104.9 (3.76 × 4.13)
No. of piston rings Compression ring: 2 / Oil ring: 1
Total piston displacement liter
Compression ratio (to 1) 2,999
18.3
Compression pressure MPa (kg/cm2/psi) 3.0 (31.0/441) – 200 rpm
Engine weight (dry) kg (lb)MT: Approximately 249 (549)
AT: Approximately 236 (520)
Fuel injection order 1 – 3 – 4 - 2
Specified fuel type JIS No.2, DIN/EN590, GB252-1944 Diesel fuel
Idling speed rpm
700 ± 25 (A/C OFF)
800 ± 25 (A/C ON)
Valve clearances (At cold): Intake mm (in)
Exhaust mm (in)
Intake valves Open at (BTDC) deg
Close at (ABDC) deg
Exhaust valves Open at (BBDC) deg
Close at (ATDC) deg
Fuel system
Injection pump type 0.4 (0.016)
0.4 (0.016) 24.5
55.5
54.0
26.0
BOSCH distributor VP44 type
Injection nozzle type
Injection nozzle opening pressure
MPa (kg/cm
2/psi) Hole with 5 orifices

1st 19.5 (199/2,828)
2nd (Reference) 34.3 ∼35.8 (350 ∼365/4,980 ∼5,197)
Main fuel filter type
Lubricating system
Lubricating method Cartridge paper element and water separator

Pressure circulation
Specified engine oil (API grade) ISUZU genuine 10W – 30 (API CD of ACEA B2/B3)
Oil pump type
Oil filter type Gear
Cartridge paper element
Oil capacity lit (US/UK gal)
6.2 (1.64/1.36) (For 4
× 2)
7.0 (1.85/1.54) (For 4 × 4)
Oil cooler type W ater cooled

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ISUZU KB P190 2007

ENGINE MECHANICAL 6A – 31
VALVE CLEARANCE ADJUSTMENT
1. Bring the piston in either the No. 1 cylinder or the No. 4 cylinder to TDC on the compression stroke by turning
the crankshaft until the crankshaft damper pulley TDC
line is aligned with the timing pointer.

014RY00014











2. Check the rocker arm shaft bracket nuts for
looseness.
Tighten any loose rocker arm shaft bracket nuts
before adjusting the valve clearance.

Rocker Arm Shaft Bracket Nut Torque N·m (kg·m /lb·ft)
54 (5.5/40)


014RY00015
8. Check for play in the No. 1 intake and exhaust valve
push rods.
If the No. 1 cylinder intake and exhaust valve push
rods have play, the No. 1 piston is at TDC on the
compression stroke.
If the No. 1 cylinder intake and exhaust valve push
rods are depressed, the No. 4 piston is at TDC on the
compression stroke.

014RY00016
Adjust the No.1 or the No. 4 cylinder valve clearances
while their respective cylinders are at TDC on the
compression stroke.
Valve Clearance (At Cold) mm (in)
0.4 (0.016)

9. Loosen each valve clearance adjusting screw as
shown in the illustration.
10. Insert a feeler gauge of the appropriate thickness between the rocker arm and the valve stem end.

014RY00017


11. Turn the valve clearance adjusting screw until a slight
drag can be felt on the feeler gauge.
12. Tighten the lock nut securely.
13. Rotate the crankshaft 360 °.
14. Realign the crankshaft damper pulley TDC notched line with the timing pointer.
15. Adjust the clearances for the remaining valves as shown in the illustration.



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6A – 98 ENGINE MECHANICAL


RTW 36ASH002001



































6. Piston Ring
1. Use a piston ring replacer to install the three piston rings.
Piston Ring Replacer
Install the piston rings in the order shown in the
illustration.
1. Oil ring
2. 2nd compression ring
3. 1st compression ring

NOTE:
Install the compression rings with the stamped side
facing up.
Insert the expander coil into the oil ring groove so that
there is no gap on either side of the expander coil
before installing the oil ring.
2. Apply engine oil to the piston ring surfaces.
3. Check that the piston rings rotate smoothly in the piston ring grooves





7. Connecting Rod Bearing
Carefully wipe any oil or other foreign material from the
connecting rod bearing back face and the connecting rod
bearing fitting surface.




015R100006

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ENGINE MECHANICAL 6A – 107


RTW 36ASH002001




11. Piston and Connecting Rod with Upper Bearing
12. Connecting Rod Bearing Cap with Lower Bearing
1. Apply a coat of engine oil to the circumference of each piston ring and piston.
2. Position the piston ring gaps as shown in the illustration.
1. Oil ring
2. 2nd compression ring
3. 1st compression ring










3. Apply a coat of molybdenum disulfide grease to the two
piston skirts.
This will facilitate smooth break-in when the engine is
first started after reassembly.
4. Apply a coat of engine oil to the upper bearing surfaces.
5. Apply a coat of engine oil to the cylinder wall.














6. Position the piston head front mark so that it is facing
the front of the engine.
7. Use the piston ring compressor to compress the piston rings.
Piston Ring Compressor: 5-8840-9018-0
8. Use a hammer grip to push the piston in until the connecting rod makes contact with the crankpin.
At the same time, rotate the crankshaft until the
crankpin is at BDC.



9. Align the bearing cap cylinder number marks and the connecting rod cylinder number marks.
The cylinder number marks must be turned toward the
exhaust manifold.



015LX096
015R100007 015R100006

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ENGINE MECHANICAL 6A – 137
SPECIAL TOOLS
Illustration Tool Number Tool Name
5-8840-0201-0 Filter
W rench
5-8840-0253-0 Filter
W rench
5-8840-2675-0 Compression Gauge

5-8531-7001-0
Adapter; Compression Gauge
5-8840-2723-0
Nozzle Holder Remover
5-8840-0019-0 Sliding Hammer
5-8521-0002-0 Universal Puller
5-8840-2360-0 Oil Seal Remover

9-8523-1423-0 Spring
Compressor
9-8523-1212-0 Valve Guide Replacer

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