Camshaft: Testing and Inspection
Valve Lash (Clearance) Inspection1. Remove negative (-) cable at battery.
2. Remove cylinder head cover. Service and Repair
3. Using 17 mm wrench, turn crankshaft pulley (1) clockwise until index (2) of cylinder block and index (3) of crankshaft pulley (1) are aligned.
4. Check whether cam position (1) of No. 1 cylinder is at the specified position [A] as shown in figure. If cam position is [B], locate cam position to [A] by turning crankshaft one rotation.
5. Check valve lashes with thickness gauge (1) according to the following procedure.
a) Check valve lashes of cylinder No. 1.
b) Turn crankshaft pulley by 1800 clockwise.
c) Check valve lashes of cylinder No.3.
d) In the same manner as b) - c), check valve lashes of cylinder No.4 then cylinder No.2.
If valve lash is out of specification, record valve lash and adjust it to specification by replacing shim.
Valve clearance specification
Shim Replacement
1. Close the valve whose shim (2) is to be replaced by turning crankshaft, then turn tappet (3) till its cut section (1) faces inside as shown in the figure.
2. Lift down the valve by turning crankshaft to 3600.
3. Hold tappet at that position using special tool as follows.
a) Remove its housing bolts.
b) Check housing No. and select special tool corresponding to housing No.
Special tool selection table
c. Hold down the tappet so as not to contact the shim by installing special tool on camshaft housing with housing bolt (1) tighten housing bolts by hand.
Special Tool (A):09916-66510
4. Turn camshaft by approximately 900 clockwise and remove shim (3).
WARNING: Never put in the hand between camshaft and tappet.
5. Using a micrometer (2), measure the thickness of the removed shim (1), and determine replacement shim by calculating the thickness of new shim with the following formula and table.
Shim thickness specification
Intake side: A = B + C - 0.20 mm (0.008 in.)
Exhaust side: A = B + C - 0.30 mm (0.012 in.)
A: Thickness of new shim
B: Thickness of removed shim
C: Measured valve clearance
For example of intake side:
When thickness of removed shim is 2.40 mm (0.094 in.), and measured valve clearance is 0.45 mm (0.018 in.).
A = 2.40 mm (0.094 in.) + 0.45 mm (0.018 in.) - 0.20 mm (0.008 in.) = 2.65 mm (0.104 in.)
Calculated thickness of new shim = 2.65 mm (0.104 in.)
6. Select new shim No. (1) with a thickness as close as possible to calculated value.
Available new shims No.
7. Install new shim facing shim No. side with tappet.
8. Lift valve by turning crankshaft counterclockwise (in opposite direction against above Step 4)) and remove special tool.
Special Tool (A):09916-66510
9. Install camshaft housing (1) and tighten bolts to specified torque.
Tightening torque
Camshaft housing bolt a: 11 Nm (1.1 kgf-m, 8.0 ft. lbs.)
10. Turn crankshaft pulley more than 4 rotations.
11. Check valve clearance again.
12. After checking and adjusting all valves, install cylinder head cover.