FX50 AWD V8-5.0L (VK50VE) (2009)
Camshaft: Service and Repair
Inspection
CAMSHAFT
Inspection
CAMSHAFT (EXH) VALVE CLEARANCE ADJUSTMENT
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Perform adjustment depending on selected head thickness of valve lifter (EXH).
1. Measure the valve clearance. Refer to See: Cylinder Head Assembly/Valve Clearance/Testing and Inspection.
2. Remove VVEL ladder assembly and camshaft (EXH). Refer to See: Disassembly And Assembly.
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)
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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 See: Specifications.
6. Install selected valve lifter (EXH).
7. Install VVEL ladder assembly and camshaft (EXH). Refer to See: Disassembly And Assembly.
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 See: Cylinder Head
Assembly/Valve Clearance/Testing and Inspection.
10. Install all removed parts in the reverse order of removal.
11. Warm up the engine, and check for unusual noise and vibration.