TM-5-4310-389-14
3-23 TIMING GEARS (VALVE ADJUSTMENT/DECOMPRESSION CHECK)
DESCRIPTION
This task covers: Adjust
INITIAL SETUP
Tools:
Equipment Conditions:
General Mechanic Tool Kit
1. Engine secured and cooled down
(paragraph 2-11).
2. Valve covers removed
(paragraph 3-22).
Materials/parts
Gasket
ADJUST
NOTE
Valve clearance to be checked with cold engine.
a.
Turn crankshaft at front end until the valves of the cylinder in question are overlapping (exhaust valve about to
close, inlet valve about to open).
b.
Mark crankshaft pulley.
c.
Then continue turning the crankshaft through 360 degrees.
d.
Check valve clearance (figure 3-21).
1.
Valve clearance (1) is correct when a 0.15 mm feeler gauge can be inserted with a slight drag between rocker
arm (2) and valve (3).
2
If valve clearance must be readjusted.
e.
Adjust according to the following steps.
1.
Loosen locknut (4) by two to three turns.
2.
Adjust setscrew (5) with screwdriver so that, when locknut is retightened, the feeler gauge can be inserted and
withdrawn with slight drag.
3-39
