Valve Clearance Adjustments - Yale GLP20LX Service Manual

Cylinder Head Assembly Repair
Assemble
NOTE: The rocker arm shaft fits tightly in the rocker
arm support brackets. Clamp the rocker arm shaft in a
padded vise and twist and push the support brackets
onto the rocker arm shaft.
NOTE: To properly align the rocker arm shaft with
the support brackets, first install the rocker arm shaft
support bracket with the hole for the shaft alignment
screw. Align the hole in the rocker arm shaft and the
hole in the support bracket. Install the alignment
screw. See Figure 7.
1. Lubricate the rocker arm shaft. Slide the rocker
arm support brackets, springs, and rocker arms
onto the shaft.
2. Position the rocker arm assembly on a flat sur-
face. Install the retaining rings onto the ends of
the rocker arm shaft. See Figure 7.
3. If removed, install the valve adjusting screws and
lock nuts.
Install
1. Install the push rods.
2. Place the rocker arm assembly in position on the
cylinder head.
3. Install and hand tighten the rocker arm shaft re-
taining bolt and nuts.
4. Align the push rods with their respective rocker
arms.
5. Tighten the rocker arm shaft retaining bolt and
nuts.
6. Tighten the rocker arm shaft alignment screw.
7. Adjust the valve lash. See Valve Clearance Ad-
justments.
8. Install the valve cover. See Valve CoverInstall.
10

VALVE CLEARANCE ADJUSTMENTS

NOTE: Make measurements and adjustments while
the engine is cold.
NOTE: The cylinder to be adjusted first does not
have to be the number one cylinder. Select and adjust
the cylinder where the piston is the nearest to top
dead center (TDC) after rotating and make the adjust-
ment for the other cylinders in the order of the ignition
by turning the crankshaft 180 degrees each time.
1. Remove the valve cover. See Valve CoverRe-
move.
NOTE: The number one piston position is on the fly-
wheel end of the engine, opposite side of the radiator,
and the ignition order is 1 - 3 - 4 - 2 at 180 degree in-
tervals.
NOTE: Since the intake and exhaust valve rocker
arms are operated the same and there is a clearance
between rocker arm and valve generally at top dead
center, the position can be checked by means of the
play when the arm head is held with a hand. Also, see
that the crankshaft pulley top mark is positioned at
zero on the timing scale. If there is no valve clear-
ance, inspection in the disassembled state is neces-
sary since the valve seat may be worn abnormally.
2. Rotate the crankshaft clockwise, as seen from the
radiator side, to bring the number one piston to
top dead center (TDC) while watching the rocker
arm motion, timing scale, and top mark position of
the crankshaft pulley. (Position where both the in-
take and exhaust valves are closed.)
3. Insert a feeler gauge between the rocker arm and
valve cap. See Figure 11. Record the measured
valve clearance. The valve clearance should be
between 0.15 to 0.25 mm (0.006 to 0.010 in.).
0600 YRM 1205