Engine: Service Precautions

PRECAUTIONS

Precautions 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.

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. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness connectors.

Precautions for Drain Engine Coolant
Drain engine coolant when engine is cooled.

Precautions for Disconnecting Fuel Piping
^ Before starting work, make sure 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.

Precautions for 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.
^ Cover openings of engine system with 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.

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

Precautions for Assembly and Installation
^ Use torque wrench to tighten bolts or nuts to specification.
^ When tightening nuts and bolts, 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.
^ 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 engine and increase engine speed to check engine coolant, fuel, engine oil, and exhaust gasses for leakage.

Parts Requiring Angle Tightening
^ For the final tightening of the following engine parts use Tool:
Tool number: KV10112100 (BT-8653-A)
- Cylinder head bolts
- Lower cylinder block bolts
- Connecting rod cap bolts
- Crankshaft pulley bolt (No angle wrench is required as bolt flange is provided with notches for angle tightening)
^ 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.