TM 5-3810-300-24&P-3
14.2
FUEL INJECTOR TIMING
To time an injector properly, the injector follower must be
3. Place the small end of the injector timing gage (refer
adjusted to a definite height in relation to the injector
to the charts for the correct timing gage) in the hole
body.
provided in the top of the injector body with the flat of the
gage toward the injector follower (Fig. 1).
All of the injectors can be timed in firing order sequence
during one full revolution of the crankshaft. Refer to the
4. Loosen the injector rocker arm push rod lock nut.
General Specifications at the front of the manual for the
engine firing order.
5. Turn the push rod and adjust the injector rocker
Time Fuel Injector
Timing
Timing
Camshaft
Injector
Dimension
Gage
Timing
After the exhaust valve clearance has been adjusted
71N5
*1.460"
J 1853
*Standard
(Section 14.1), time the fuel injectors as follows:
N55
*1.460"
J 1853
*Standard
N60
*1.460"
J 1853
*Standard
1. Place the governor speed control lever in the idle
N65
(white
*1.460"
J 1853
Standard
speed position. If a stop lever is provided, secure it in
tag)
the stop position.
N65 (Turbo
*1.484"
J 1242
Standard
2. Rotate the crankshaft, manually or with the starting
(brown
motor, until the exhaust valves are fully depressed on the
tag)
particular cylinder to be timed.
N65
Non-
**1.484"
J 1242
**Advance
Turbo
d
CAUTION: If a wrench is used on the crankshaft
(brown
bolt at the front of the engine, do not turn the
tag)
N70 Turbo
1 460"
J 1853
Standard
N70
Non-
1 460"
J 1853
Advanced
Turbo
∅N70 Turbo
1.484"
J 1242
Standard
∅N75 Turbo
1.484"
J 1242
Standard
*Use 1 484" timing gage (J 1242) when engine has
advanced camshaft timing.
Correct to standard
camshaft timing and 1.460" injector timing at first
opportunity to be consistent with current production
build.
**Use 1 460" timing gage (J 1853) when engine has
standard camshaft timing Correct to advanced
camshaft timing and 1 484'" injector timing at first
opportunity
NOTE: Advanced camshaft timing is indicated by "ADV-
CAM-TIMING" stamped on the lower right-hand
side of the option plate.
∅ 1973 build engines.
INJECTOR TIMING GAGE CHART
Fig. 1 - Timing Fuel Injector
(Needle Valve)
crankshaft in a left-hand direction of rotation or the bolt
may be loosened.
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