Isuzu N-Series. Manual - part 511

Engine Mechanical (4HK1-TC)   6A-149

3. Amount of the cylinder liner extrusion

Measure the amount of the cylinder liner extrusion
using a dial gauge.
Difference of the amount of the extrusion between
adjacent two cylinders should be within 0.03 mm
(0.0012 in).

Caution:
Be sure to measure the cylinder liner extrusion
whenever you have replaced cylinder liners.

4. Install the piston oil jet.

• Align the dowel pin of the oil jet with the pin hole

on the cylinder block and tighten with the check
valve.

Tighten:
Bolts to 21 N

⋅m (2.1 kg⋅m/15 lb⋅ft)

Caution:
Be careful not to deform or damage the oil jet nozzle.

5. Install the crankshaft.

Refer to “Crankshaft”.

6. Install pistons and connecting rods.

Refer to “Pistons and Connecting Rod”.

7. Install the oil pump.

Refer to “Oil Pump”.

8. Install the timing gear train.

Refer to “Timing Gear Train”.

9. Install the front cover.

Refer to “Front Cover”.

10. Install the water pump.

Refer to “Water Pump” in Section 6B.

11. Install the oil pan.

Refer to “Oil Pan”.

12. Install the crankshaft rear oil seal.

Refer to “Crankshaft Rear Oil Seal”.

13. Install the crankshaft front oil seal.

Refer to “Crankshaft Front Oil Seal”.

14. Install the fuel supply pump.

Refer to “Fuel Supply Pump” in Section 6C.

15. Install the cylinder head.

Refer to “Cylinder Head”.

16. Install the camshaft assembly.

Refer to “Camshaft Assembly”.

17. Install the rocker arm shaft assembly.

Refer to “Rocker Arm Shaft Assembly”.

18. Install the cylinder head cover.

Refer to “Cylinder Head Cover”.

19. Mount the engine assembly on the chassis.

Refer to “Engine Assembly”.

Amount of the cylinder liner extrusion

mm (in)

Standard

0.05 – 0.10 (0.0020 –  0.0039)

N6A6287E

N6A6171E

N6A6289E

6A-150   Engine Mechanical (4HK1-TC)

Lubrication System

Service Precautions

• During each disassembly, remove the old gasket

adhering to each part and mating part completely
using a scraper at the location, where the fluid
gasket is to be used, clean the traces of oil,
moisture, and dirt completely using waste cotton
and apply the specified new fluid gasket at each
location.

• Avoid excessive or insufficient coating amount.

Note that seizure may occur in case of excessive
coating due to clogging of the oil gallery and oil jet,
and oil and water leakage may occur if the coating
is insufficient.

• Always, the starting and ending piston of

application should be overlapped.

Explanations on Functions and Operation
The lubrication system uses the filter element
combined with a full flow bypass, water-cooled oil
cooler, and oil jet for piston cooling.

Lubricating System Diagram

Functional Check

Oil pressure check

1. Check whether the engine oil is contaminated with

dirt, fuel or water. If contaminated with dirt, fuel, or
water (after examining the cause and taking the
appropriate measures for fuel or water
contamination), replace the oil.

2. Check the engine oil level. The oil level should be

between the two holes of the level gauge. If the oil
level is insufficient, replenish it.

3. Remove the oil pressure switch on the oil filter

body.

N6A6647E

Engine Mechanical (4HK1-TC)   6A-151

4. Install the oil pressure gauge on the oil filter body.

Special tool
Oil pressure gauge set:
5-8840-2843-0
(Oil pressure gauge: J-43630-20)
(Hose: J-43630)
(Connector: J-43630-14)
(Oil pressure testing adapter: EN-46333)

Legend

1. Oil Filter Cartridge
2. Oil Pressure Testing Adapter
3. Connector
4. Hose
5. Oil Pressure Gauge

 

5. Warm the engine.
6. Measure the oil pressure, to check whether it is

more than 343 kPa (3.5 kg/cm

2

 / 50 psi) at

3200 rpm.

7. Stop the engine.
8. Remove the oil pressure gauge.
9. Install the oil pressure switch.

10. Start the engine and check for oil leakage.

Engine oil

• Ensure the car is at a level ground. Before starting

the engine or when 5 minutes or more have
elapsed after stopping the engine, check the
engine oil volume using the level gauge. The
volume is appropriate if the engine oil is between
the upper and lower limits of the level gauge.
Replenish the engine oil, if level is below the lower
limit. Also, check for contamination of the engine
oil.

Legend

1. Upper Limit
2. Lower Limit

 

Engine oil leakage

• In the lift up condition, confirm that there are no

leaks from the cylinder head cover and oil pan.

N6A6291E

N6A6292E

N6A6293E

6A-152   Engine Mechanical (4HK1-TC)

Special Tool

Illustration

Tool Number / 

Description / Remarks

5-8840-2843-0

Oil Pressure Gauge Set

(J-43630-20 / 

Oil Pressure Gauge, 

J-43630 / Hose, 

J-43630-14 / Connector, 

EN-46333 / Oil Pressure 

Testing Adapter)

5884028430