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TM5-4210-229-14&P
6-6. CYLINDER HEAD AND VALVES MAINTENACE (Continued).
x. Engine timing check (using a feeler gauge).
(1) Adjust the number 1 intake valve with the
number 1 piston set at top dead center com-
pression stroke to 0.029 inch (0.74 mm).
(2) Turn the engine forward to approximately
bottom dead center.
(3) Place a 0.004 inch (0.10 mm) feeler gauge
between the valve lever and valve stem of
the number 1 intake valve and slowly rotate
the engine forward until the feeler gauge
becomes tight. This is now the point at
which the number 1 intake valve starts to
open before top dead center. The degree
readings should be 24° ± 3°.
NOTE
One tooth out of time on gear train equals
approximately 11 degrees movement of
vibration damper.
If the timing on the number 1 valve is within
specifications, the other valves, barring ex-
treme camshaft lobe wear or poor
adjustment,
will also be in time.
(4) Readjust the number 1 intake valve to its
proper lash as described in step w.
(5) If timing is found to be incorrect, removal of
the engine's front cover is required to in-
spect punch mark and gear tooth position.
y. Engine timing check (using a dial indicator).
(1) Adjust the number 1 intake valve with the
number 1 piston set at top dead center com-
pression stroke to 0.029 inch (0.74 mm).
(2) Position the dial indicator fixture magnetic
base on the valve cover fence rail with the
indicator shaft on the number 1 intake valve
rotator.
(3) Set dial indicator at zero.
(4) Rotate the engine approximately one full
revolution either direction to a position of
360° from starting point.
(5) Read the dial indicator. The following
readings indicate proper gear train timing:
0.155 to 0.220 inch (3.9 to 5.5 mm).
(6) If dial indicator readings are outside the
specified range, the engine's front cover
must be removed and punch mark and gear
tooth position adjusted.
z. Install valve cover (paragraph 4-90).
aa. Install injection nozzles (paragraph 4-77).
bb. Install engine (paragraph 5-1 1).
6-14
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