Engine: Service Precautions

PRECAUTIONS

Precaution for Procedure without Cowl Top Cover

When performing the procedure after removing cowl top cover, cover the lower end of windshield with urethane, etc.

Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER"
The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER" used along with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.

WARNING:
^ To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in the event of a collision which would result in air bag inflation, all maintenance must be performed by an authorized NISSAN/INFINITI dealer.
^ Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal injury caused by unintentional activation of the system.
^ Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this Service Information. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness connectors.

Precaution Necessary for Steering Wheel Rotation after Battery Disconnect

NOTE:
^ Before removing and installing any control units, first turn the push-button ignition switch to the LOCK position, then disconnect both battery cables.
^ After finishing work, confirm that all control unit connectors are connected properly, then re-connect both battery cables.
^ Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work. If a DTC is detected, perform trouble diagnosis according to self-diagnosis results.

This vehicle is equipped with a push-button ignition switch and a steering lock unit.

If the battery is disconnected or discharged, the steering wheel will lock and cannot be turned.

If turning the steering wheel is required with the battery disconnected or discharged, follow the procedure below before starting the repair operation.

OPERATION PROCEDURE
1. Connect both battery cables.

NOTE:
Supply power using jumper cables if battery is discharged.

2. Turn the push-button ignition switch to ACC position.
(At this time, the steering lock will be released.)
3. Disconnect both battery cables. The steering lock will remain released with both battery cables disconnected and the steering wheel can be turned.
4. Perform the necessary repair operation.
5. When the repair work is completed, re-connect both battery cables. With the brake pedal released, turn the push-button ignition switch from ACC position to ON position, then to LOCK position. (The steering wheel will lock when the push-button ignition switch is turned to LOCK position.)
6. Perform self-diagnosis check of all control units using CONSULT-III.

Draining Engine Coolant
Drain engine coolant and engine oil when the engine is cooled.

Disconnecting Fuel Piping
^ Before starting work, check no fire or spark producing items are in the work area.
^ Release fuel pressure before disconnecting and disassembly.
^ After disconnecting pipes, plug openings to stop fuel leakage.

Removal and Disassembly
^ When instructed to use SST, use specified tools. Always be careful to work safely, avoid forceful or uninstructed operations.
^ Exercise maximum care to avoid damage to mating or sliding surfaces.
^ Dowel pins are used for several parts alignment. When replacing and reassembling parts with dowel pins, check that dowel pins are installed in the original position.
^ Cover openings of engine system with a tape or equivalent, if necessary, to seal out foreign materials.
^ Mark and arrange disassembly parts in an organized way for easy troubleshooting and re-assembly.
^ When loosening nuts and bolts, as a basic rule, start with the one furthest outside, then the one diagonally opposite, and so on. If the order of loosening is specified, do exactly as specified. Power tools may be used in the step.

Inspection, Repair and Replacement
Before repairing or replacing, thoroughly inspect parts. Inspect new replacement parts in the same way, and replace if necessary.

Assembly and Installation
^ Use torque wrench to tighten bolts or nuts to specification.
^ When tightening bolts and nuts, as a basic rule, equally tighten in several different steps starting with the ones in center, then ones on inside and outside diagonally in this order. If the order of tightening is specified, do exactly as specified.
^ Replace with new gasket, packing, oil seal or O-ring.
^ Dowel pins are used for several parts alignment. When replacing and reassembling parts with dowel pins, check that dowel pins are installed in the original position.
^ Thoroughly wash, clean, and air-blow each part. Carefully check engine oil or engine coolant passages for any restriction and blockage.
^ Avoid damaging sliding or mating surfaces. Completely remove foreign materials such as cloth lint or dust. Before assembly, oil sliding surfaces well.
^ Release air within route when refilling after draining engine coolant.
^ After repairing, start the engine and increase engine speed to check engine coolant, fuel, engine oil, and exhaust gases for leakage.

Parts Requiring Angle Tightening
^ Use the angle wrench [SST: KV10112100 (BT8653-A)] for the final tightening of the following engine parts:
^ Cylinder head bolts
^ Lower cylinder block bolts
^ Connecting rod cap bolts
^ Do not use a torque value for final tightening.
^ The torque value for these parts are for a preliminary step.
^ Ensure thread and seat surfaces are clean and coated with engine oil.