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Home >> Nissan-Datsun >> 2011 >> Altima L4-2.5L (QR25DE) >> Repair and Diagnosis >> Engine, Cooling and Exhaust >> Engine >> Service and Repair >> Removal and Replacement

Removal and Replacement





ENGINE ASSEMBLY


Removal and Installation












WARNING:
- Place chocks at the front and back of the rear wheels.
- For engines not equipped with slingers, attach proper slingers and bolts as described in the Parts
Catalog.

CAUTION:
- Do not start working until the exhaust system and coolant are cool.
- If items or work required are not covered by the engine main body section, follow the applicable procedures.
- Use the correct supporting points for lifting and jacking. Tools and Equipment Garage Jack And Safety Stand, "Garage Jack and Safety
Stand".
- In removing the drive shaft, be careful not to damage the grease seals on the transaxle.

REMOVAL
1. Remove engine cover using power tool.
2. Release fuel pressure. Inspection For California (California), Inspection For USA And Canada (Except California).
3. Disconnect the negative and positive battery terminal. Removal And Installation Coupe (Coupe models), (Sedan models).
4. Disconnect the fuel rail at the fuel hose quick connector (engine side). Service and Repair .
5. Drain the engine coolant. Changing Engine Coolant.
6. Remove the engine under cover. Removal And Installation Coupe (Coupe models) or Removal And Installation Sedan, "Removal and Installation" (Sedan models).
7. Drain power steering fluid. Draining.
8. Remove hood assembly. Removal And Installation Coupe.
9. Remove the air duct and air cleaner case assembly. Service and Repair.
10. Remove battery tray. Removal And Installation Coupe (Coupe models) or (Sedan models).
11. Disconnect the ECM.
12. Remove the ECM bracket.
13. Remove cowl top. Removal And Installation Coupe (Coupe models), Removal And Installation Sedan (Sedan models).
14. Remove strut brace. Exploded View.
15. Disconnect EVAP hose and vacuum hose from intake manifold.
16. Disconnect and set aside the IPDM/ER and remove the IPDM/ER bracket. Service and Repair.
17. Remove upper and lower radiator hoses (engine side)

NOTE:
Cap or plug opening(s) to prevent fluid from spilling.
18. Remove CVT cooler lines (CVT models).

NOTE:
Cap or plug opening(s) to prevent fluid from spilling.
19. Disconnect the heater hoses.

NOTE:
Cap or plug opening(s) to prevent fluid from spilling.
20. Remove front LR and RH wheels and tires. Adjustment.
21. Remove the fender protector side covers RH and LH. Removal And Installation Coupe (Coupe models) or Removal And Installation Sedan (Sedan models).





22. Remove the lower side bolt of the lower steering shaft assembly.
23. Remove rear cover plate.
24. Remove the torque converter nuts (CVT models).
25. Remove the rear engine mount torque rod.
26. Remove front exhaust tube. Exploded View.
27. Remove the left and right drive shafts. Front Drive Shaft Left Side, Front Drive Shaft Right Side.

NOTE:
Cap or plug opening(s) to prevent fluid from spilling.
28. Remove the drive belt. Removal and Replacement.
29. Remove the front suspension member. Removal And Installation.
30. Dismount the A/C compressor with piping connected and secure with wire to the radiator support.
31. Disconnect the power steering hose and tube from the power steering gear.

NOTE:
Cap or plug opening(s) to prevent fluid from spilling.
32. Disconnect the clutch operating cylinder fluid line (M/T models). Removal and Replacement.
- Drain the clutch fluid.
33. Disconnect the transaxle shift controls.
34. Disconnect electrical connectors from transaxle (M/T models)





35. Install engine slingers into front left cylinder head (A) and rear right cylinder head (B).
- Use generator bracket bolt holes for the front slinger.
- Use the proper slingers and bolts as described in the Parts
Catalog.






36. Support engine and transaxle assembly with engine lifting equipment from the top with the vehicle raised on a hoist.
37. Remove the RH engine mount torque rod, RH engine support bracket and RH engine mounting insulator and bracket.
38. Remove LH transaxle mounting insulator through-bolts.
39. Lower the engine and transaxle assembly from the engine compartment using suitable tool.

CAUTION:
- Before and during this procedure, always check if any harnesses are left connected.
- Avoid any damage to, or any oil/grease smearing or spills onto the engine mounting insulators.
40. Remove the starter motor. Starter Motor.
41. Separate engine and transaxle. (M/T), Exploded View (CVT).

INSTALLATION
Installation is in the reverse order of removal.

NOTE:
Tighten the transmission mounting bolts to specification. Removal And Installation (M/T), Removal And Installation (CVT).
- Do not allow oil to get on mounting insulators. Be careful not to damage mounting insulators.
- If parts have a direction mark (arrow) this indicates front of the vehicle, and the parts must be installed according to the identification mark.





- Install the RH engine mounting bracket bolts in the following steps:
- First install bolts (A) and (B) loosely.
- Install and tighten the five RH engine mounting bracket bolts to specification in the order as shown.

RH engine mounting bracket bolt : 48.2 N.m (4.9 kg-m, 36 ft-lb)

Arrow Indicates Front

INSPECTION AFTER INSTALLATION
- Before starting engine, check oil/fluid levels including engine coolant and engine oil. If less than required quantity, fill to the specified level.
- Use procedure below to check for fuel leakage.
- Turn ignition switch ON (with engine stopped). With fuel pressure applied to fuel piping, check for fuel leakage at connection points.
- Start engine. With engine speed increased, check again for fuel leakage at connection points.
- Run engine to check for unusual noise and vibration.

NOTE:
If hydraulic pressure inside timing chain tensioner drops after removal and installation, slack in the guide may generate a pounding noise during and just after engine start. However, this is normal. Noise will stop after hydraulic pressure rises.
- Warm up engine thoroughly to make sure there is no leakage of fuel, exhaust gas, or any oils/fluids including engine oil and engine coolant.
- Bleed air from passages in lines and hoses, such as in cooling system.
- After cooling down engine, again check oil/fluid levels including engine oil and engine coolant. Refill to specified level, if necessary.
- Summary of the inspection items:




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