Camshaft Valve Clearance Adjustment
WARNING: This page is about a different variant/trim than selected.
- Perform adjustment depending on selected head thickness of valve lifter.
- Measure the valve clearance. Refer to Inspection .
- Remove VVEL ladder assembly and exhaust camshaft. Refer to Removal and Installation .CAUTION: Do not loosen adjusting bolts and bolts (black color) of VVEL ladder assembly.
- Remove valve lifter (EXH) or valve lifter (INT) at the locations that are out of the standard.
- Measure the center thickness of the removed valve lifters with a suitable tool (A).
- Use the equation below to calculate valve lifter thickness for replacement.
Valve lifter (EXH) thickness calculation:
t = t 1 + (C 1 - C 2 )
t
= Valve lifter (EXH) thickness to be replaced
t 1
= Removed valve lifter (EXH) thickness
C 1
= Measured valve clearance
C 2
= Standard valve clearance:
Exhaust
: 0.33 mm (0.013 in)
- Thickness of new valve lifter can be identified by stamp marks on the reverse side (inside the cylinder).
Stamp mark 312N or 312n indicates 3.12 mm (0.1228 in) in thickness.
(A)
: Stamp
(B)
: Thickness of valve lifter
NOTE: Available thickness of valve lifter: 26 sizes with range 3.00 to 3.50 mm (0.1181 to 0.1378 in) in steps of 0.02 mm (0.0008 in) (when manufactured at factory). Refer to Camshaft . - Thickness of new valve lifter can be identified by stamp marks on the reverse side (inside the cylinder).
- Install selected valve lifter.
- Install VVEL ladder assembly and exhaust camshaft. Refer to Removal and Installation .
- Manually turn crankshaft pulley 2 revolutions clockwise.
- Check that the valve clearances for cold engine are within the specifications by referring to the specified values. Refer to Inspection .
- Installation of remaining components is in the reverse order of removal.
- Warm up the engine, and check for unusual noise and vibration.