Engine Mechanical: Removal & Installation Infiniti Q45 III

PRECAUTIONS FOR REMOVAL AND DISASSEMBLY

1. When instructed to use special service tools, use the specified tools. Always be careful to work safely, avoid forceful or uninstructed operations.
2. Exercise maximum care to avoid damage to mating or sliding surfaces.
3. Cover openings of engine system with tape or the equivalent, if necessary, to seal out foreign materials.
4. Mark and arrange disassembly parts in an organized way for easy troubleshooting and re-assembly.
5. 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 where noted in the step.

PRECAUTIONS FOR ASSEMBLY AND INSTALLATION

1. Use torque wrench to tighten bolts or nuts to specification.
2. 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.
3. Replace with new liquid gasket, packing, oil seal or O-ring.
4. Thoroughly wash, clean, and air-blow each part. Carefully check engine oil or engine coolant passages for any restriction and blockage.
5. Avoid damaging sliding or mating surfaces. Completely remove foreign materials such as cloth lint or dust. Before assembly, engine oil sliding surfaces well.
6. Release air within route when refilling after draining engine coolant.
7. After repairing, start engine and increase engine speed to check engine coolant, fuel, engine oil, and exhaust systems for leakage.

REMOVAL

1. Remove clips on back with clip driver. CAUTION: Do not damage or scratch cover when installing or removing.
2. Major parts and inspection points under each cover are as follows; (numbered as in illustration)

1. Upper side of engine assembly, power steering reservoir tank, cooling fan reservoir tank
2. Relay
3. Battery, relay box
4. Cooling fan fluid cooler, power steering fluid cooling tube
5. Engine assembly front side, drive belts, cooling fan
6. Mass air flow sensor, air cleaner case

INSTALLATION

Install in the reverse order of removal.

Scheme 128

1. Remove air duct (inlet) when inspecting drive belt for alternator, water pump and A/C compressor.
2. Remove engine undercover (with power tool) when inspecting power steering oil pump belt.
3. Make sure that indicator (single line notch) of each auto tensioner is within the allowable working range (between three line notches). NOTE: Check the auto tensioner indication when the engine is cold. When the new drive belt is installed, the range should be A. The indicator notch is located on the moving side of the auto tensioner for alternator, water pump and A/C compressor belt, while it is found on the fixed side for power steering oil pump belt.
4. Visually check entire belt for wear, damage or cracks.
5. If the indicator is out of allowable working range or belt is damaged, replace the belt.

1. Remove air duct (inlet) and engine undercover (with power tool).
2. Remove drive belts. Refer to «REMOVAL AND INSTALLATION»(ref-231095-S00603610242006050300000) . Keep auto tensioner pulley arm locked after belt is removed.
3. Remove auto tensioner and idler pulley with power tool. Keep auto tensioner pulley arm locked to install or remove auto tensioner.

Install in the reverse order of removal.

Scheme 129

1. Remove engine cover and air cleaner cover. Refer to «REMOVAL AND INSTALLATION»(ref-231095-S21134367422006050300000) .
2. Remove harness connector from mass air flow sensor.
3. Remove air duct (inlet), air cleaner case/mass air flow sensor assembly and air duct/resonator assembly disconnecting their joints. Add marks as necessary for easier installation.
4. Remove mass air flow sensor from air cleaner case. CAUTION: Handle mass air flow sensor with following cares. Do not shock it. Do not disassemble it. Do not touch its sensor.
5. Remove resonator in fender lifting left fender protector.

Installation in the reverse order of removal paying attention to the following.

1. Align marks. Attach each joint. Screw clamps firmly.

Scheme 130

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Scheme 133

Scheme 134

1. Remove engine cover (with power tool), air cleaner cover and battery cover. Refer to «REMOVAL AND INSTALLATION»(ref-231095-S21134367422006050300000) .
2. Release fuel pressure. Refer to «FUEL PRESSURE RELEASE»(ref-151802-S17369107142003010800000) .
3. Remove air cleaner case and air duct assembly. Refer to «REMOVAL AND INSTALLATION»(ref-231095-S06686960942006050300000) .
4. Drain engine coolant when engine is cooled. Refer to «CHANGING ENGINE COOLANT»(ref-183866-S19457821222005081700000) .
5. Disconnect fuel tube quick connector on engine side only. Using tool of quick connector release [SST: J-45488], perform the following steps to disconnect quick connector. Remove quick connector cap on engine side only. With the sleeve side of quick connector release facing quick connector, install quick connector release onto fuel tube. Insert quick connector release into quick connector until sleeve contacts and goes no further. Hold the quick connector release on that position. CAUTION: Inserting the quick connector release hard will not disconnect quick connector. Hold quick connector release where it contacts and goes no further. Draw and pull out quick connector straight from fuel tube. CAUTION: Pull quick connector holding A position in illustration. Do not pull with lateral force applied. O-ring inside quick connector may be damaged. Prepare container and cloth beforehand as fuel will leak out. Avoid fire and sparks. Be sure to cover openings of disconnected pipes with plug or plastic bag to avoid fuel leakage and entry of foreign materials.
6. Move cooling fan fluid reservoir tank.
7. Remove or disconnect intake manifold upper, wiring harnesses, brackets, vacuum hose, vacuum gallery and PCV hose and tube. CAUTION: Cover engine openings to avoid entry of foreign materials.
8. Disconnect water hoses.
9. Remove electric throttle control actuator loosening fixing bolts diagonally. CAUTION: Handle carefully to avoid any shock.
10. Loosen bolts in reverse order of illustration to remove intake manifold upper assembly with power tool.
11. Loosen bolts in reverse order of illustration to remove intake manifold lower assembly with power tool.

Install in the reverse order of removal paying attention to the following.

Installation of Electric Throttle Control Actuator

1. Install intake manifold adapter gasket and electric throttle control actuator gasket so that three protrusions for installation identification do not face downward.
2. Tighten fixing bolts of electric throttle control actuator equally and diagonally in several steps.
3. After installation perform procedure in «INSPECTION AFTER INSTALLATION»(ref-231095-S33968001262006050300000) .

Install in the reverse order of removal paying attention to the following.

Installation of Heated Oxygen Sensor

Scheme 135

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Scheme 137

1. Remove front tire.
2. Remove hood assembly. .
3. Remove engine undercover and engine cover with power tool.
4. Drain engine oil.
5. Remove drive belts. Refer to «REMOVAL AND INSTALLATION»(ref-231095-S00603610242006050300000) .
6. Remove auto tensioner of power steering oil pump belt. Refer to «DRIVE BELT AUTO TENSIONER AND IDLER PULLEY»(ref-231095-S05769777882006050300000) .
7. Move power steering oil pump and remove power steering oil pump bracket.
8. Remove oil filter.
9. Remove A/C compressor fitting bolts, and install A/C compressor temporarily on vehicle side with ropes or equivalent.
10. Disconnect harness and wires of lower side of oil pan from oil pan.
11. Remove crankshaft position sensor (POS) from transmission. CAUTION: Do not drop or shock it. Do not disassemble it. Do not let steel powders contact magnetic parts of sensor tips. Do not leave where magnetically effected.
12. Install engine slinger and hang engine assembly to secure position. Refer to «REMOVAL AND INSTALLATION.»(ref-231095-S06636579622006050300000)
13. Remove front suspension member. Refer to «FRONT SUSPENSION MEMBER»(ref-166164-S29479490292004091400000) .
14. Remove oil pan in the order shown below. Remove rear plate cover. Remove transmission joint bolts (M12: 4 bolts) which pierce oil pan. Loosen oil pan bolts with power tool in reverse order of illustration to remove. NOTE: Exclude No. 11 and No. 17 in removal. Insert seal cutter between oil pan and cylinder block. Slide seal cutter by tapping on side of the seal cutter with a hammer. Remove oil pan.
15. Remove oil strainer.

1. Remove engine cover (with power tool), air cleaner cover and battery cover. Refer to «REMOVAL AND INSTALLATION»(ref-231095-S21134367422006050300000) .
2. Move heater hose and its peripheral parts aside. (No. 7 cylinder)
3. Disconnect harness connector from ignition coil.
4. Remove ignition coil. CAUTION: Do not shock it.

Install in the reverse order of removal.

Scheme 138

Scheme 139

1. Remove engine cover with power tool. Refer to «ENGINE ROOM COVER»(ref-231095-S41109186642006050300000) .
2. Remove ignition coil. Refer to «IGNITION COIL»(ref-231095-S21650249192006050300000) .
3. Remove spark plug with spark plug wrench (commercial service tool).

Install in the reverse order of removal.

1. Spark plug
2. 19.6 - 29.4 N.m (2.0 - 2.9 kg-m, 15 - 21 ft-lb)

Scheme 140

Scheme 141

1. Release fuel pressure. Refer to «FUEL PRESSURE RELEASE»(ref-151802-S17369107142003010800000) .
2. Remove intake manifold upper with power tool. Refer to «REMOVAL AND INSTALLATION»(ref-231095-S12730739602006050300000) .
3. Disconnect fuel injector sub harness connectors.
4. Disconnect fuel damper assembly with hose from fuel tube RH and LH.
5. Remove fuel injectors with fuel tube assembly.
6. Expand and remove clips securing fuel injectors.
7. Extract fuel injectors straight from fuel tubes. Be careful not to damage injector nozzles during removal. Do not bump or drop fuel injectors.

Scheme 142

1. Carefully install O-rings, including the one used the fuel damper Lubricate O-rings by smearing new engine oil. Be careful not to damage O-rings and surfaces for O-ring sealing with service tools, finger nails or clips. Do not expand or twist O-rings. Discard old clips; replace with new ones.
2. Position clips in grooves on fuel injectors. Make sure that protrusions of fuel injectors are aligned with cutouts of clips after installation.
3. Align protrusions of fuel with those of fuel injectors.
4. After properly inserting fuel injectors, check to make sure that fuel tube protrusions are engaged with those of fuel injectors, and that flanges of fuel tubes are engaged with clips.
5. Tighten fuel tube assembly mounting bolts "a" to "c" in illustration and in two steps. 1st step : 9.3 - 10.8 N.m (0.95 - 1.1 kg-m, 6.2 - 7.9 ft-lb) 2nd step : 20.6 - 26.5 N.m (2.1 - 2.7 kg-m, 16 - 19 ft-lb)
6. Install all removed parts in the reverse order of removal.

VALVE GUIDE REPLACEMENT

When valve guide is removed, replace with oversized (0.2 mm, 0.008 in) valve guide.

Scheme 143

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Scheme 147

1. To remove valve guide, heat cylinder head to 110 to 130°C (230 to 266°F) by soaking in heated oil.
2. Drive out valve guide with a press [under a 20 kN (2 ton, 2.2 US ton, 2.0 lmp ton) pressure] or hammer and suitable tool. CAUTION: Cylinder head contains heat, when working wear protective equipment to avoid getting burned.
3. Ream cylinder head valve guide hole. Valve guide hole diameter (for service parts) Intake and exhaust: 10.175 - 10.196 mm (0.4006 - 0.4014 in)
4. Heat cylinder head to 110 to 130°C (230 to 266°F) by soaking in heated oil.
5. Press valve guide from camshaft side to dimensions as in illustration. CAUTION: Cylinder head contains heat, when working wear protective equipment to avoid getting burned.
6. Using valve guide reamer, apply reamer finish to valve guide. Standard Intake and exhaust: 6.000 - 6.018 mm (0.2362 - 0.2369 in)

Scheme 148

1. After confirming that the dimensions of valve guides and valves are within specifications, perform this procedure.
2. Apply Prussian blue (or white lead) onto contacting surface of valve seat to check the condition of the valve contact on the surface.
3. Check if the contact area band is continuous all around the circumference.
4. If not, grind to adjust valve fitting and check again. If the contacting surface still has N.G conditions even after the re-check, replace valve seat.

VALVE SEAT REPLACEMENT

When valve seat is removed, replace with oversized (0.5 mm, 0.020 in) valve seat.

Scheme 149

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Scheme 152

Scheme 153

1. Bore out old seat until it collapses. Boring should not continue beyond the bottom face of the seat recess in cylinder head. Set the machine depth stop to ensure this.
2. Ream cylinder head recess diameter for service valve seat. Oversize [0.5 mm (0.020 in)]: Intake 37.500 - 37.516 mm (1.4764 - 1.4770 in) Exhaust 32.700 - 32.716 mm (1.2874 - 1.2880 in) Be sure to ream in circles concentric to the valve guide center. This will enable valve seat to fit correctly.
3. Heat cylinder head to 110 to 130°C (230 to 266°F) by soaking in heated oil.
4. Provide valve seats cooled well with dry ice. Force fit valve seat into cylinder head. CAUTION: Avoid directly touching cold valve seats. Cylinder head contains heat, when working wear protective equipment to avoid getting burned.
5. Using valve seat cutter set and valve seat grinder, finish the seat to the specified dimensions. CAUTION: When using valve seat cutter, firmly grip the cutter handle with both hands. Then, press on the contacting surface all around the circumference to cut in a single drive. Improper pressure on with the cutter or cutting many different times may result in stage valve seat. Grind to obtain the dimensions indicated in figure.
6. Using compound, grind to adjust valve fitting.
7. Check again for normal contact.

Install in the reverse order of removal.

Scheme 154

1. Where positioning pin is used, be sure to securely insert it into the hole of mating part.
2. When installing front engine mount bracket to cylinder block, first tighten two bolts on upper side. Then, tighten two bolts on lower side. (The same applies to both right and left.)