4-22 ENGINE TOP END
Valve Clearance Inspection
Valve clearance must be checked and adjusted when
the engine is cold (room temperature).
Remove the cylinder head cover (see Cylinder Head
Remove the cylinder head oil pipes (see Cylinder Head
Oil Pipe Removal).
Unscrew the upper [A] and lower [B] caps on the alterna-
Special Tool - Filler Cap Driver: 57001-1454
Check the valve clearance when the pistons are at TDC.
The pistons are numbered beginning with the engine left
Using a wrench on the crankshaft rotation bolt [A], turn
the crankshaft clockwise [B] until the "C" mark [C] on the
rotor is aligned with the notch [D] in the edge of the upper
hole in the alternator cover for #2 piston and "T" mark for
Measure the valve clearance of the valves for which the
cam lobe is pointing away from the rocker arm.
Each piston has two inlet and two exhaust valves. Mea-
sure these two inlet or exhaust valves at the same crank-
Valve Clearance Measuring Position
#2 Piston TDC at End of Compression Stroke →
Inlet valve clearances of #2 piston, and
Exhaust valve clearances of #2 piston
Check the valve clearance using this method only.
Checking the clearance at any other cam position may
result in improper valve clearance.
#1 Piston TDC at End of Compression Stroke →
Inlet valve clearances of #1 piston, and
Exhaust valve clearances of #1 piston