COMPILER TECO/ATL
REG. CODE
1-5302-351
MODEL N°
50563
DATE OF ISSUE
04.90
REVISION 04
ENDORSED
DATE
15.11.99
37
VALVE TIMING CONFIRMATION
A Intake Valve
B Exhaust Valve
Rotate the engine in the normal direction of rotation until the No. 1
piston (flywheel side) approaches TDC- compression stroke. Setup
dial indicators on the intake and exhaust valve caps as shown.
Locate the dial indicators so that the full valve travel will be indicated
by needle movement. Rotate the engine (normal direction) until the
valves are on “rocking point”. Rocking point is defined as the
condition at which any small movement of the crankshaft results in
opposing valve movements. That is, a movement of the crankshaft
CW with result in one valve tending to open and the other valve
tending to close. Further, a movement of the crankshaft CCW will
result in the opposite valve behavior. Position the crankshaft so that
both valves are at the highest point possible with reference to the
dial indicator movements- thus TDC. Zero the dial indicators. Rotate
the engine 360° so that the engine is at TDC- exhaust stroke. Check
the valve timing angles as detailed below.
VALVE TIMING ANGLES
With the engine setup as above and positioned at TDC- exhaust
stroke as determined above, fit the engine crankshaft with a suitable
“degree wheel” and pointer. Set the pointer to 0°. Adjust valve
clearance to 0.25mm at the camshaft to rocker arm roller interface.
Zero the dial indicators. Rotate the engine clockwise (when facing
the crankshaft pulley end of the engine) and check conformance to
the chart to the left and the data below.
S = TDC (Top Dead Center)
I = BDC (Bottom Dead Center)
a = Intake Valve Opening Angle
b = Intake Valve Closing Angle
g = Exhaust Valve Opening Angle
d = Exhaust Valve Closing Angle
LDW 502, 602, 903 and 1204:
a = 16° BTDC
b = 36° ABDC
g = 36° BBDC
d = 16° ATDC
LDW 1204/ T
a = 10° BTDC
b = 42° ABDC
g = 56° BBDC
d = 16° ATDC
DISASSEMBLY/REASSEMBLY
II
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