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DISASSEMBLY, REASSEMBLY, INSPECTION, AND MAINTENANCE 3-31
Valve System
HLA Reassembly
•
Make sure that the piston is at the top-dead-center of the compression
stroke.
CAUTION
Make sure to apply engine oil to all the sliding areas of the
HLA, pushrod, rocker arm, rocker shaft, and valve before
reassembly.
•
Insert the HLA (with its end on which the snap ring is visible facing
up) from the cylinder head side of the engine block.
•
Mate the tip of the pushrod to the recess in the HLA, and the other
end with the recess in the rocker arm, and install the cylinder head.
A: Pushrod
B: Rocker Shaft
C: Rocker Arm
D: Valve
E: HLA
F: Engine Block
G: Cylinder Head
HLA Operation Precaution
The HLA comes filled with low-viscosity oil.
Once the engine starts, the low-viscosity oil is gradually replaced with
the engine oil.
After an engine that has previously operated is rebuilt, the valve takes
approximately 20 minutes to seat itself. Therefore, start a rebuilt
engine 20 minutes after it has been rebuilt. This prevents the engine
from starting poorly due to a compression leak.
If the engine is restarted after the HLA has been replaced with a new
one, the valve could be noisy, but the noise will go away after the
engine is operated for a while in the medium speed range.
Valve Clearance Inspection and Adjustment
NOTE
Inspect and adjust the valve clearance on a cold engine.
•
Rotate the crankshaft in the normal direction in order to bring the
piston to the top-dead-center of its compression stroke.
•
Using a gap gauge, measure the clearance of the intake and exhaust
valves.
•
If the clearance differs from the specified value, adjust it to the
specified value.
Specified Valve Clearance on Cold Engine
Intake: 0.12 mm (0.005 in)
Exhaust: 0.12 mm (0.005 in)
•
Loosen the lock nut. Turn the rocker arm pivot in or out to attain the
specified clearance. (FE120, 170, 250)
On the FE290, use a pair of pliers to hold the adjustment bolt, and
then loosen the lock nut. Turn the adjustment bolt in or out to attain
the specified clearance.
For FE120, 170, 250
A: Rocker Arm Pivot
B: Rocker Arm
C: Locknut
D: Valve
E: Valve Clearance