Engine Mechanical (VK56VD): Adjustments Infiniti M37 IV

Tension Adjustment

Refer to " DRIVE BELTS ".

Scheme 316

1. Remove air duct (inlet). Refer to " «EXPLODED VIEW»(ref-573596-S05717187862013082200000) ".
2. Remove reservoir tank. Refer to " «EXPLODED VIEW»(ref-573598-S31937941162013082200000) ".
3. With box wrench, and while securely holding the hexagonal part in pulley center of auto tensioner (1), move wrench handle in the direction of arrow (loosening direction of belt tensioner). CAUTION: Never place hand in a location where pinching may occur if the holding tool accidentally comes off. Never loosen the hexagonal part in center of auto tensioner pulley (Never turn it clockwise). If turned clockwise, the complete auto tensioner must be replaced as a unit, including the pulley.
4. Under the above condition, insert a metallic bar (A) of approximately 6 mm (0.24 in) in diameter (hexagonal bar wrench shown as example in the figure below) through the holding boss to lock auto tensioner pulley arm. Leave auto tensioner pulley arm locked until belt is installed again.
5. Remove alternator, water pump and A/C compressor belt.

Scheme 317

1. Remove engine undercover with power tool.
2. Remove alternator, water pump and A/C compressor belt. Refer to " «ALTERNATOR, WATER PUMP AND A/C COMPRESSOR BELT»(ref-573596-S24359745162013082200000) ".
3. With box wrench, and while securely holding the hexagonal part in pulley center of auto tensioner (1), move wrench handle in the direction of arrow (loosening direction of tensioner). CAUTION: Never place hand in a location where pinching may occur if the holding tool accidentally comes off. Never loosen the hexagonal part in center of auto tensioner pulley (Never turn it clockwise). If turned clockwise, the complete auto tensioner must be replaced as a unit, including the pulley.
4. Under the above condition, insert a metallic bar (A) of approximately 6 mm (0.24 in) in diameter (hexagonal bar wrench shown as example in the figure below) through the holding boss to lock auto tensioner pulley arm. Leave auto tensioner pulley arm locked until belt is installed again.
5. Remove power steering oil pump belt.

CAMSHAFT (EXH) VALVE CLEARANCE ADJUSTMENT

1. Perform adjustment depending on selected head thickness of valve lifter (EXH).

Scheme 318

Scheme 319

1. Measure the valve clearance. Refer to " «INSPECTION»(ref-573596-S05347332542013082200000) ".
2. Remove VVEL ladder assembly and camshaft (EXH). Refer to " «DISASSEMBLY AND ASSEMBLY»(ref-573596-S23394472632013082200000) ". CAUTION: Never loosen adjusting bolts and mounting bolts (black color) of VVEL ladder assembly.
3. Remove valve lifter (EXH) at the locations that are out of the standard.
4. Measure the center thickness of the removed valve lifters (EXH) with a micrometer (A).
5. Use the equation below to calculate valve lifter (EXH) thickness for replacement. Valve lifter (EXH) thickness calculation: t = t1 + (C1 - C2) t = Valve lifter (EXH) thickness to be replaced t1 = Removed valve lifter (EXH) thickness C1 = Measured valve clearance C2 = Standard valve clearance: Exhaust: 0.33 mm (0.013 in) Thickness of new valve lifter (EXH) can be identified by stamp marks on the reverse side (inside the cylinder). Stamp mark 788 indicates 7.88 mm (0.3102 in) in thickness. Available thickness of valve lifter (EXH): 27 sizes with range 7.88 to 8.40 mm (0.3102 to 0.3307 in) in steps of 0.02 mm (0.0008 in) (when manufactured at factory). Refer to " «CAMSHAFT»(ref-573596-S09392030462013082200000) ".
6. Install selected valve lifter (EXH).
7. Install VVEL ladder assembly and camshaft (EXH). Refer to " «DISASSEMBLY AND ASSEMBLY»(ref-573596-S23394472632013082200000) ".
8. Manually turn crankshaft pulley a few turns.
9. Check that the valve clearances for cold engine are within the specifications by referring to the specified values. Refer to " «INSPECTION»(ref-573596-S05347332542013082200000) ".
10. Install all removed parts in the reverse order of removal.
11. Warm up the engine, and check for unusual noise and vibration.