Valve Clearance: Service and Repair

CAMSHAFT VALVE CLEARANCE

Camshaft valve clearance

- Perform this inspection as follows after removal, installation, or replacement of the camshaft or any valve related parts, or if there are any unusual engine conditions due to changes in valve clearance over time (starting, idling, and/or noise).
1.Remove the fender protector side cover (RH). Refer to "FENDER PROTECTOR : Removal and Installation" Removal And Installation.
2.Remove the rocker cover using power tool. Refer to "Removal and Installation" Removal And Installation.





3.Turn crankshaft pulley clockwise when viewed from front to align
TDC identification mark (B) with timing indicator (A).
NOTE:
Do not confuse TDC mark (B) with paint marks (C).





4.At this time, check that the both intake and exhaust cam lobes of
No. 1 cylinder face outside.
- If they do not face outside, turn crankshaft pulley once more.





5.Measure valve clearances with a feeler gauge at locations marked (X) in the table below.
- No.1 cylinder compression TDC.





White arrow indicates : Engine front





- Use a feeler gauge to measure the clearance between valve lifter and camshaft.
Valve clearance:Refer to "Standard and Limit" [1][2]Specifications.
6.Turn crankshaft one complete revolution (360�) and align mark on crankshaft pulley with pointer.





7.Measure valve clearances with a feeler gauge at locations marked (X) in the table below.
- No.4 cylinder compression TDC.





White arrow indicates : Engine front

ADJUSTMENT

NOTE:
- Perform adjustment by selecting the valve lifter with the correct head thickness.
1.Remove camshaft. Refer to "Removal and Installation" Removal And Installation.
2.Remove the valve lifters at the locations that are outside the standard.





3.Measure the center thickness of the removed valve lifters with a micrometer (A).
4.Use the equation below to calculate valve lifter thickness for replacement.
- Valve lifter thickness calculation.
t = t1 + (C1 - C2)
t = Thickness of replacement valve lifter.
t1 = Thickness of removed valve lifter.
C1 = Measured valve clearance.
C2 = Standard valve clearance.





- Thickness of a new valve lifter (B) can be identified by stamp marks (A) on the reverse side (inside the cylinder).
Stamp mark 300 indicates a thickness of 3.00 mm (0.1181 in)
Available thickness of valve lifter: 26 sizes with a range of 3.00 to 3.50 mm (0.1181 to 0.1378 in), in steps of 0.02 mm (0.0008 in), when assembled at the factory.
5.Install the selected valve lifter.
6.Install camshaft. Refer to "Removal and Installation" Removal And Installation.
7.Install timing chain and related parts. Refer to "Removal and Installation" Removal And Installation.
8.Manually rotate crankshaft pulley a few rotations.
9.Check that valve clearances for cold engine are within specifications by referring to the specified values.
Valve clearance Refer to "Standard and Limit" [1][2]Specifications.
10.Install all removed parts in the reverse order of removal.
11.Warm up the engine, and check for unusual noise and vibration.