Isuzu N-Series. Manual — part 509
Engine Mechanical (4HK1-TC) 6A-141
Bearing Selection Table
Installation
1. Install the crankshaft upper bearing.
• Install the upper bearing in the cylinder block
and apply oil.
Caution:
When replacing the crankshaft bearings, select grades
referring to the Bearing Selection table. Do not apply oil
to the bearing installation surface on the cylinder block
and external surface of the bearing.
2. Install the upper thrust bearing.
• Install the upper thrust bearing in the front side
of the cylinder block journal No.5. In doing this,
you may attach the upper thrust bearing to the
cylinder block with grease. Then, be sure to
wipe up excess grease.
Caution:
Install the thrust bearing so that the oil groove contacts
the crankshaft.
3. Install the crankshaft assembly.
• Apply engine oil to the crankshaft journal and
gently place the crankshaft on the cylinder
block.
• Press the crankshaft to the rear and insert the
upper thrust bearing in the rear side of the
cylinder block journal No.5.
Caution:
Install the thrust bearing so that the oil groove contacts
the crankshaft.
Combination of grades
Oil clearance
mm (in)
Cylinder block
Grade
Crank journal
Grade
Bearing identification
color
#1, 2, 4, 5
#3
1
1
Black
0.039 – 0.070
(0.00154 – 0.00276)
0.053 – 0.084
(0.00209 – 0.00331)
1
2
Brown
0.037 – 0.068
(0.00146 – 0.00267)
0.051 – 0.082
(0.00201 – 0.00323)
2
1
Blue
0.041 – 0.072
(0.00161 – 0.00283)
0.055 – 0.086
(0.00217 – 0.00339)
2
2
Black
0.039 – 0.070
(0.00154 – 0.00276)
0.053 – 0.084
(0.00209 – 0.00331)
N6A6275E
N6A6276E
6A-142 Engine Mechanical (4HK1-TC)
4. Install the lower crankshaft bearing.
5. Install the lower thrust bearing.
• Install the lower thrust bearing in the rear side
of the crankcase journal No.5.
• Install the thrust bearing so that the oil groove
contacts the crankshaft.
6. Install the crankcase.
• Apply liquid gasket (ThreeBond 1207C or
equivalent) to the crankcase forming beads
with diameters of 3 – 4 mm (0.12 – 0.16 in).
• Install the crankcase within 7 minutes after you
have applied the liquid gasket.
• Gently place the crankcase on the cylinder
block.
• Apply Molybdenum Disulfide to M14 bolt’s
threads and setting faces and tighten them to
the specified tightening torque in the sequence
shown.
N6A6277E
N6A6278E
N6A6279E
Engine Mechanical (4HK1-TC) 6A-143
• Do not apply any oil to M10 bolts.
Tighten:
M14 bolts (1
– 10) to
1st step: 98 N
⋅m (10.0 kg⋅m/72 lb⋅ft)
2nd step: 132 N
⋅m (13.5 kg⋅m/97 lb⋅ft)
3rd step: 30
° – 60° (degrees)
M10 bolts (11
– 27) to
4th step: 38 N
⋅m (3.9 kg⋅m/28 lb⋅ft)
• Tighten bolts from 1-10 (M14) and confirm that
they are tightened to a torque of 167 N
⋅m (17.0
kg
⋅m/123 lb ft) or more.
Special tool
Angle gauge: 5-8840-0266-0 (J-45059)
Caution:
Confirm that the crankshaft turns smoothly.
7. Install pistons and connecting rods.
Refer to “Piston and Connecting Rod”.
8. Install the oil pump.
Refer to “Oil Pump”.
9. Install the timing gear train.
Refer to “Timing Gear Train”.
10. Install the front cover.
Refer to the “Front Cover”.
11. Install the water pump.
Refer to “Water Pump” in Section 6B.
12. Install the oil pan.
Refer to “Oil Pan”.
13. Install the crankshaft rear oil seal.
Refer to “Crankshaft Rear Oil Seal”.
14. Install the crankshaft front oil seal.
Refer to “Crankshaft Front Oil Seal”.
15. Install the fuel supply pump.
Refer to “Fuel Supply Pump” in Section 6C.
16. Install the cylinder head.
Refer to “Cylinder Head”.
17. Install the camshaft assembly.
Refer to “Camshaft Assembly”.
18. Install the rocker arm shaft assembly.
Refer to “Rocker Arm Shaft Assembly”.
19. Install the cylinder head cover.
Refer to “Cylinder Head Cover”.
20. Mount the engine assembly on the chassis.
Refer to “Engine Assembly”.
N6A6268E
6A-144 Engine Mechanical (4HK1-TC)
Torque Specifications
Special Tool
N6A6280E
Illustration
Tool Number /
Description / Remarks
8-9439-1097-0
(EN-47684)
Crankshaft Gear Puller
5-8840-2667-0 (J-41222)
Crankshaft Gear Installer
Illustration
Tool Number /
Description / Remarks
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