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
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
B.
Refer to
C.
Refer to
D.
Refer to
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
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
.
• 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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