Tools Required

Important: 

1. Remove the cylinder head cover. Refer to Cylinder Head Cover Replacement .



2. Turn the crankshaft clockwise until the alignment notch on the crankshaft pulley is aligned with the "0" mark on the engine front cover tab.



3. Check that the point marks on the camshaft gears are aligned. If the point marks on the camshaft gears are not aligned, turn the crankshaft clockwise one revolution in order to align the camshaft gears.



4. Using a feeler gage, measure the clearance between the intake valve shims and the intake camshaft for cylinders #1, and #2.

Intake Valve Clearance (Cold):
0.08-0.18 mm (0.0031-0.0071 in)

Important: Record any out of specification valve clearance measurements. The measurements will be used later to determine the required replacement shim.

5. Using a feeler gage, measure the clearance between the exhaust valve shims and the exhaust camshaft for cylinders #1, and #3.

Exhaust Valve Clearance (Cold):
0.22-0.32 mm (0.0087-0.0126 in)

Important: Record any out of specification valve clearance measurements. The measurements will be used later to determine the required replacement shim.

6. Turn the crankshaft clockwise 1 revolution until the alignment notch on the crankshaft pulley is aligned with the "0" mark on the engine front cover tab.



7. Using a feeler gage, measure the clearance between the intake valve shims and the intake camshaft for cylinders #3, and #4.

Intake Valve Clearance (Cold):
0.08-0.18 mm (0.0031-0.0071 in)

Important: Record any out of specification valve clearance measurements. The measurements will be used later to determine the required replacement shim.

8. Using a feeler gage, measure the clearance between the exhaust valve shims and the exhaust camshaft for cylinders #2, and #4.

Exhaust Valve Clearance (Cold):
0.22-0.32 mm (0.0087-0.0126 in)

Important: Record any out of specification valve clearance measurements. The measurements will be used later to determine the required replacement shim.

9. If there were any valve clearances that were out of specifications, the valve shims must be replaced.

1. Turn the crankshaft so the related rocker arm, where the valve clearance is to be adjusted, is fully pushed down.
2. Install J 45785-1 onto the spark plug tube.

Important: To avoid unlocking the valve spring keeper, do not allow clearance between the valve retainer and J 45785-1 .




3. Operate the lever on J 45785 so the tool seat surface comes to contact with the valve retainer and lock them with the set screw.
4. Lock the set screw on the spark plug tube side of J 45785 .



5. Rotate the crankshaft so the camshaft is positioned as shown.



6. Using J 45785-2 , lift the rocker arm and remove the valve adjusting shim.

Important: In order to maintain the specified valve clearance the proper shim must be selected. Perform the following procedure in order to select the proper shim:

1. Determine the valve(s) clearances that were out of specifications.
2. Remove the shim(s) from the out of specification valves.



3. Use a J 26900-13 and J 8001 to measure the thickness of the removed shim.
4. After measuring the shim, determine the size of the replaced shim according to the formula as follows:

•	A = Thickness of used shim

•	B = Measured valve clearance

•	C = Thickness of new shim

•	Intake Valve: C= A + (B -- 0.13 mm (0.0051 in)) x 1.5

•	Exhaust Valve: C = A + (B -- 0.27 mm (0.0106 in)) x 1.5

•	Shims are available in 41 size increments of 0.020 mm (0.0008 in), from 2.000 mm (0.0787 in) to 2.800 mm (0.1102 in).

5. After selecting the proper shim, re-measure the valve clearance.
6. Install the cylinder head cover. Refer to the installation instructions in Cylinder Head Cover Replacement .