Nissan Frontier. Manual - part 723

 

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Nissan Frontier. Manual - part 723

 

 

ENGINE UNIT

EM-81

< UNIT DISASSEMBLY AND ASSEMBLY >

[QR25DE]

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Block Heater — Canada Only

Disassembly and Assembly

INFOID:0000000009478079

DISASSEMBLY

NOTE:

The following procedures explain how to disassemble the engine with the engine stand fastened to the bell

housing. Some steps may be different if using a different type of engine stand. 
1. Remove the engine and the transmission assembly from the vehicle, and separate the transmission

assembly from the engine. Refer to 

EM-77

.

2. Remove clutch cover and clutch disc (M/T models). Refer to 

CL-19, "5M/T : Removal and Installation"

.

1.

Cylinder block

2.

O-ring

3.

Crankshaft position sensor (POS)

4.

Knock sensor

5.

Oil pressure switch

6.

Water drain plug 

7.

Oil level gauge 

8.

Oil level gauge guide

9.

O–ring

10. Lower cylinder block

11. Lower cylinder block mounting bolt

12. Snap ring

13. Connecting rod

14. Connecting rod bearing

15. Connecting rod bearing cap

16. Connecting rod bolt

17. Piston

18. Oil ring

19. Second ring

20. Top ring

21. Piston pin

22. Thrust bearing

23. Main bearing upper 

24. Crankshaft

25. Crankshaft key

26. Main bearing lower

27. Rear oil seal

28. Pilot convertor (A/T models)

29. Pilot bushing (M/T models)

30. Signal plate (type 1)

31. Signal plate (type 2)

32. Reinforcement plate (A/T models)

33. Drive plate (A/T models)

34. Flywheel (M/T models)

A.

Refer to 

EM-81, "Disassembly and 

Assembly"

B.

Refer to 

EM-81, "Disassembly and 

Assembly"

C.

Refer to 

EM-81, "Disassembly and 

Assembly"

D.

Refer to 

EM-81, "Disassembly and 

Assembly"

PBIC3021E

1.

Cylinder block

2.

Gasket

3.

Cylinder block heater

4.

Connector protector cap

EM-82

< UNIT DISASSEMBLY AND ASSEMBLY >

[QR25DE]

ENGINE UNIT

3. Remove flywheel (M/T models) using suitable tool or drive plate

(1) (A/T models) using Tool (A).

• Secure crankshaft Tool, and remove bolts using a suitable

tool.

CAUTION:

• Be careful not to damage or scratch drive plate (A/T

models) and contact surface for clutch disc of flywheel

(M/T models).

• Place the drive plate or flywheel with signal plate sur-

face facing other than downward.

• Keep magnetic materials away from signal plate.

NOTE:

The flywheel, two block construction, allows movement in

response to transmission side pressure, or when rotated.

Therefore, some amount of noise is normal.

4. Remove the parts that may restrict installation of engine to

engine stand.

a. Remove drive plate (A/T models) or flywheel (M/T models).

• Holding crankshaft pulley bolts, lock crankshaft to remove flywheel or drive plate bolts.

• Loosen bolts diagonally.

b. Remove generator. Refer to 

CHG-28, "Removal and Installation - QR25DE Models"

.

c.

Remove engine mounting insulator bracket (upper) with power tool.

5. Lift engine, and mount to engine stand. Any commercially avail-

able engine stand can be used.

CAUTION:

• Use an engine stand that has a load capacity [approxi-

mately 240kg (529 lb) or more] large enough for support-

ing the engine weight. 

• Before removing the hanging chains, make sure the

engine stand is stable and there is no risk of overturning.

NOTE:

The figure shows an example of widely used engine stand (A)

that can support mating surface of transaxle with drive plate

removed.

• Remove the following parts if the engine stand load capacity is not adequate, to reduce the potential risk

of overturning stand:

- Intake manifold. Refer to 

EM-27, "Removal and Installation"

.

- Exhaust manifold. Refer to 

EM-31, "Removal and Installation"

- Rocker cover. Refer to 

EM-37, "Removal and Installation"

6. Drain engine oil. Refer to 

LU-10, "Changing Engine Oil"

.

Tool number

: KV11105210 (J-44716)

JPBIA4425ZZ

KBIA2491E

AWBIA1520ZZ

ENGINE UNIT

EM-83

< UNIT DISASSEMBLY AND ASSEMBLY >

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7. Drain engine coolant by removing water drain plugs (1), (2) and

(3)  from side of the engine. 

CAUTION:

Do not reuse copper sealing washer.

NOTE:

For Canada, the cylinder block drain plug (3) as shown, is not a

cylinder block drain plug but a block heater.

8. Remove cylinder head. Refer to 

EM-67, "Removal and Installation"

.

9. Remove knock sensor.

CAUTION:

Carefully handle knock sensor avoiding shocks.

10. Remove crankshaft position sensor (POS).

CAUTION:

• Avoid impacts such as a dropping.

• Do not disassemble.

• Keep it away from metal particles.

• Do not place the sensor in a location where it is exposed

to magnetism.

11. Remove oil pressure switch using a suitable tool.

CAUTION:

Do not drop or shock oil pressure switch.

12. Remove pilot converter (A/T models) or pilot bushing (M/T mod-

els) using Tool. 

13. Remove piston and connecting rod assembly as follows:

• Before removing piston and connecting rod assembly, check the connecting rod side clearance. Refer to

EM-91, "Inspection After Disassembly"

.

CAUTION:

AWBIA1524ZZ

PBIC2191E

Tool number

: ST16610001 (J-23907)

WBIA0618E

EM-84

< UNIT DISASSEMBLY AND ASSEMBLY >

[QR25DE]

ENGINE UNIT

Be careful no to drop connecting rod bearing, and to scratch the surface.

14. Position crankshaft pin corresponding to connecting rod to be removed onto the bottom dead center. 
15. Remove connecting rod bearing cap. 
16. Push piston and connecting rod assembly out to the cylinder

head side using suitable tool.

CAUTION:

Be careful not to damage the cylinder wall and crankshaft

pin, resulting from an interference of the connecting rod big

end.

17. Remove connecting rod bearings from connecting rod and connecting rod bearing cap. 

CAUTION:

Identify installation position, and store them without mixing them up.

18. Remove piston rings from piston. 

• Before removing piston rings, check the piston ring side clearance. Refer to 

EM-91, "Inspection After

Disassembly"

.

• Remove piston rings using piston ring expander or suitable

tool.

CAUTION:

• When removing piston rings, be careful not to damage

piston.

• Be careful not to damage piston rings by expanding

them excessively.

19. Remove piston from connecting rod as follows: 
a. Remove snap rings using snap ring pliers.

PBIC0259E

PBIC0087E

PBIC1638E

 

 

 

 

 

 

 

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