SECTION 10 - ENGINE
10-68
Piston Position in Relation to the Crankshaft Angle
(BTDC)
N844, N844T
Crankshaft Angle
(BTDC)
Position
13
14
15
16
17
18
19
20
21
22
23
24
25
26
0.0594″ (1.510 mm)
0.0689″ (1.749 mm)
0.0789″ (2.005 mm)
0.0897″ (2.278 mm)
0.1011″ (2.569 mm)
0.1132″ (2.875 mm)
0.1259″ (3.199 mm)
0.1393″ (3.539 mm)
0.1533″ (3.895 mm)
0.1680″ (4.267 mm)
0.1833″ (4.655 mm)
0.1991″ (5.058 mm)
0.2156″ (5.477 mm)
0.2328″ (5.912 mm)
Slowly turn the crankshaft clockwise until flowing fuel
from the delivery holder is stopped. Check the piston
position at this point. If the position is later than “Y”
BTDC, use a thinner shim. If the position exceeds “Z”
BTDC, use a thicker shim.
Changing the shim thickness by 0.004″ (0.1 mm) will
change the timing approximately one degree. Adding
shims decreases the angle, while subtracting shims
increases the angle.
NOTE: When the shim is not needed, assemble by
coating, using liquid sealant.
110
SPILL-TIMING PROCEDURE
1. Verify that the timing mark on the crankshaft
pulley is in line with the “TOP” mark on the timing
scale. If the mark on the crankshaft pulley is not
in line with the “TOP” mark, verify piston top-dead
center with a dial indicator. If the pulley mark is
slightly off, re-mark the pulley and proceed.
NOTE: Color the timing mark on the crankshaft
pulley and appropriate marks on the timing scale to
increase visibility.
2. Reinstall the valve spring, keepers, rocker arm
assembly, and valve cover.
3. Shut off the fuel supply to the injection pump at
the fuel filter.
111
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