Isuzu N-Series. Service manual — part 515
Engine Mechanical (4HK1-TC) 6A-165
Oil Pump
Components
Legend
1. Oil Pump Assembly
2. Spring
3. Ball
4. Split Pin
5. Driven Gear and Shaft
6. Oil Pump Body
7. Slinger
Removal
1. Drain out the engine oil.
2. Drain out the cooling water.
3. Remove the cylinder head cover.
Refer to “Cylinder Head Cover”.
4. Remove the rocker arm shaft assembly.
Refer to “Rocker Arm Shaft Assembly”.
5. Remove the camshaft assembly.
Refer to “Camshaft Assembly”.
6. Remove the cylinder head assembly.
Refer to “Cylinder Head”.
7. Clutch pressure plate assembly
Refer to “Flywheel”.
8. Driven plate
Refer to “Flywheel”.
9. Remove the fuel supply pump assembly.
Refer to “Fuel Supply Pump” in Section 6C.
10. Remove the flywheel.
Refer to “Flywheel”.
11. Remove the rear oil seal of the crankshaft.
Refer to “Crankshaft Rear Oil Seal”.
12. Remove the oil pan.
13. Remove the power steering pump.
14. Remove the idle gear cover of the power steering
pump.
N6A6312E
6A-166 Engine Mechanical (4HK1-TC)
15. Remove the idle gear of the power steering pump.
16. Remove the flywheel housing.
• Make sure you remove the bolts shown in the
figure.
17. Remove the idle gear A.
18. Remove the oil pump assembly.
Disassembly
1. Remove the driven gear and shaft.
2. Remove the split pin.
3. Remove the spring.
4. Remove the ball.
Reassembly
1. Install the ball.
2. Install the spring.
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N6A6313E
N6A6314E
Engine Mechanical (4HK1-TC) 6A-167
3. Install the split pin and fold it according to (1).
4. Apply engine oil on the driven gear and shaft and
mount them on the oil pump body.
Inspection
1. Measure the clearance between the gear and the
inner wall of the oil pump body.
• Measure the clearance between the gear and
oil pump body using a thickness gauge.
• If the clearance between the gear and inner
wall of the body exceeds the limit, replace the
gear assembly or the driven gear assembly.
2. Measure the clearance between the gear side
surface and the upper surface of the oil pump
body.
• Measure the clearance between the gear
surface and the upper surface of the oil pump
body using the thickness gauge and square.
• If the clearance between the gear and inner
wall of the body exceeds the limit, replace the
gear assembly or the driven gear assembly.
3. Measure the clearance between the driven gear
shaft and the bush.
• Measure the outside diameter of the driven
gear shaft using a micrometer.
Clearance between the gear and inner
wall of the body
mm (in)
Standard
0.125 – 0.220 (0.0049 – 0.0087)
Limit
0.30 (0.0118)
N6A6315E
N6A6316E
Clearance between the gear side surface
and the upper surface of the oil pump
body
mm (in)
Standard
0.064 – 0.109 (0.0025 – 0.0043)
Limit
0.20 (0.0079)
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6A-168 Engine Mechanical (4HK1-TC)
• Measure the inside diameter of the bushes of
the oil pump body and cylinder block using the
dial gauge.
• If the clearance between the driven gear shaft
and bush exceeds the limit, replace the driven
gear assembly.
Installation
1. Install the oil pump assembly.
• Apply the liquid gasket (ThreeBond 1141E or
equivalent) as shown in the figure, mount it on
the cylinder block within one hour, and tighten it
using the specified torque.
Tighten:
Oil pump assembly to 24 N
⋅m (2.4 kg⋅m/17 lb⋅ft)
Caution:
Apply the fluid gasket such that it does not enter the
holes shown by arrows in the figure, gear, and the oil
pump body.
2. Install the idling gear A.
• Install the idling gear shaft at the position
shown in the figure and apply engine oil on the
shaft.
• Rotate the crankshaft clockwise and bring the
piston of the No.1 cylinder to the top dead
center.
Outside diameter of the driven gear shaft
mm (in)
Standard
15.989 – 16.000 (0.62949 – 0.62992)
Limit
15.900 (0.62598)
Clearance between the driven gear shaft
and bush
mm (in)
Standard
0.04 – 0.07 (0.0016 – 0.0028)
Limit
0.20 (0.0079)
N6A6319E
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