Isuzu engine 4j series. Manual - part 48

6A1 – 60  4JB1/4JB1T/4JB1TC/4JG2 - ENGINE

3) Apply a coat of engine oil to the threads and setting

faces of each connecting rod cap bolt.

4) Tighten the connecting rod bearing cap bolts to the

specified torque in two steps using the Angular
Tightening Method.

Connecting Rod Bearing Cap Bolt Torque N∙m (kg∙m/lb∙ft)

1st Step

2nd Step

29 (3.0/22)

45° - 60°

NOTE

Check to see that the crankshaft turns smoothly by
rotating it manually.

4. Piston Cooling Oil Pipe

1) Install the piston cooling oil pipe to the cylinder body.
2) Tighten the oil pipe bolts and relief valve to the

specified torque.

Oil Pipe Bolt Torque

N∙m (kg∙m/lb∙ft)

! 

M8x1.25

19 (1.9/14)

N∙m (kg∙m/lb∙in)

" 

M6x1.00

8 (0.8/69)

Oil Pressure Regulating Valve Torque

N∙m (kg∙m/lb∙ft)

#

 M6x1.5

29 (3.0/22)

NOTE:

Check that there is no interference between the piston
and the oiling jet pipe by slowly rotating the
crankshaft.

3. Oil Pump Assembly

Above works refer to “OIL PUMP” Section in this manual.

2. Oil Pan Assembly

1) Apply the recommended liquid gasket or its equivalent

to the No.5 bearing cap arches, the grooves, and the
timing gear case arches at the positions shown in the
illustration.

6A1-60-1.tif

6A1-60-2.tif

4JB1/4JB1T/4JB1TC/4JG2 – ENGINE  6A1 – 61

2) Fit the gasket rear lipped portion into the No.5 groove.

Be absolutely sure that the lipped portion is fitted
snugly into the groove.

3) Install the oil pan to the cylinder body.
•

Tighten the oil pan bolts to the specified torque.

Oil Pan Bolts Torque

N∙m (kg∙m/lb∙ft)

                                                                                                                   

19 (1.9/14)

                                                                                                                   

4) Install the space rubber and stiffener (right & left side)

then tighten bolts to the specified torque.

Engine Body Side Stiffener Bolts Torque N∙m (kg∙m/lb∙ft)

                                                                                                                   

37 (3.8/27)

                                                                                                                   

Clutch Housing Side Stiffener Bolts TorqueN∙m (kg∙m/lb∙ft)

                                                                                                                   

78 (8.0/58)

                                                                                                                   

5) Install the exhaust pipe bracket.

6) Install the support rubber and tighten nuts to the

specified torque.

Support Rubber Nut Torque

N∙m (kg∙m/lb∙ft)

                                                                                                                   

40 (4.1/30)

                                                                                                                   

7) Install the vacuum pump oil hose 

!

 to oil pan.

6A1-60-1.tif

6A1-60-2.tif

6A1-60-3.tif

6A1-60-4.tif

6A1 – 62  4JB1/4JB1T/4JB1TC/4JG2 - ENGINE

1. Cylinder Head ASM

1) Cylinder head gasket
2) Cylinder head assembly
3) Push rod
4) Rocker arm shaft
5) Valve clearance adjustment
6) Cylinder head cover
7) By-pass hoses
8) Front exhaust pipe
9) Vacuum actuator hose (Exhaust Brake Model)
10) A/C compressor assembly (A/C Model)
11) Oil cooler water pipe (Oil Cooler Model)
12) Oil level gauge guide tube
13) Glow plug harness
14) PCV hose
15) Leak off pipe
16) Injection pipe
17) Air intake duct
18) Engine harness
19) A/C compressor drive belt (With A/C Model)
20) Heater hose

Above works refer to “CYLINDER HEAD ASSEMBLY
AND GASKET” Section in this manual.

4JB1/4JB1T/4JB1TC/4JG2 – ENGINE  6A1 – 63

CAMSHAFT AND TAPPET

REMOVAL

Preparation:

•

Disconnect battery ground cable.

•

Drain coolant.

•

Drain engine oil.

NOTE

Install drain plug with new washer.
Drain Plug Torque

N∙m (kg∙m/lb∙ft)

                                                                                                                   

83 (8.5/61)

                                                                                                                   

6A1-63-1.tif

Removal steps

1.  Transmission and clutch

Assembly

2. Engine Assembly
3.  Cylinder head Assembly and

gasket

4. Timing gear
     (Gear drive model)
4a. Timing belt

       (Belt drive model)

5. Oil pan
6. Oil pump
7.  Camshaft and tappets

Installation steps

To install, follow the removal
steps in the reverse order.