Engine: Removal & Installation Infiniti Q45 II

Removal

1. Release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-49502-S18357934462001011500000) . Remove hood. Disconnect battery cables. Drain cooling system and engine oil. Remove radiator.
2. Remove accessory drive belts, generator and cooling fan assembly. Remove power steering pump and secure aside. Disconnect necessary air intake hoses, vacuum hoses, fuel hoses, coolant hoses, control cables and electrical connectors.
3. Discharge A/C system using approved refrigerant recovery/recycling equipment. Ensure A/C compressor clutch electrical connector is disconnected. Remove A/C compressor. Remove refrigerant pipes as necessary.
4. Raise and support vehicle. Remove lower engine covers. Remove starter motor. Remove necessary exhaust pipes for engine and transmission removal. Disconnect oil cooler lines, control linkages and electrical connections from transmission. Remove oil dipstick tube from transmission. NOTE: Check markings on heads of drive shaft bolts before removing. Bolts must be installed in original location.
5. Mark drive shaft flange at rear axle for installation reference. Remove retaining bolts and drive shaft. Plug drive shaft opening in transmission.
6. Remove torque converter-to-flywheel bolts. Support transmission with transmission jack. Remove transmission crossmember located below transmission. Remove transmission support brace-to-cylinder block. Support engine with hoist.
7. Remove transmission-to-cylinder block bolts. Remove transmission. Remove engine mount-to-frame nuts. Lift engine from vehicle.

Installation

To install, reverse removal procedure. Tighten all fasteners to specification. See TORQUE SPECIFICATIONS at end of article. Adjust all control cables, linkages as necessary. Check and fill and fluid levels as necessary.

1. Release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-49502-S18357934462001011500000). Drain radiator and engine block. Separate accelerator control cable and Automatic Speed Control Device (ASCD) control cable from intake manifold collector.
2. Remove air duct hose. Remove necessary wires, hoses, valves and components for access to intake manifold collector and intake manifold. Remove intake manifold collector bolts in reverse order of tightening sequence. Remove intake manifold collector and gasket.
3. Remove fuel inlet and return hoses from fuel injector tube assembly. Disconnect all injector harness connections. Remove fuel tube assembly. Remove intake manifold bolts in reverse order of tightening sequence. (Scheme 2) If required, remove throttle body from intake manifold collector.

1. Install intake manifold using NEW gaskets, "O" rings and insulators. Tighten intake manifold bolts to specification in correct sequence. (Scheme 2)
2. Install intake manifold collector using NEW gaskets. Tighten intake manifold collector bolts to specification in correct sequence. (Scheme 3) See «TORQUE SPECIFICATIONS»(ref-49502-S16991742312001011500000). To complete installation, reverse removal procedure.

Scheme 2

Scheme 3