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Figure 4-10. Spark Plug Wiring		Up
TM-10-3930-633-12 Tractor Wheeled Warehouse Gasoline 4-Wheel Pneumatic Tired 4 000 Pound Drawbar Pull (Army Model MHE-228) Manual		Next
Figure 4-13. Adjusting Point Gap

TM 10-3930-633-12
Figure 4-11. Point Alignment Chart
Table 4-4. Engine Tune-up Specifications
Compression pressure, PSI 140-170
1-5-3 -6-2-4
Firing
order
Engine idle speed, RPM . . . . 500 to 550
(transmission in drive range)
Engine idle manifold vacuum
(in./Hg) . . . . . . . . . . . . . ...17
Initial timing advance 6° BTDC
(vacuum line disconnected)
Maximum governed speed:
No
load
2750
RPM
Loaded . . . . . . . . . . . . . . 2600 RPM
0°-4° at 8 in.
Vacuum advance (1000 RPM)
(degrees at in./Hg vacuum 4°-7° at 10 in.
5.5°-8.5° at 17 in.
S p a r k plug gap (inches) 0.032­0.036
Breaker arm spring tension 17­21 oz
Breaker point gap (inches) 0.024­0 .026
Dwell  angle  at  idle  35°  to  38°
b. Align the breaker points to make full face
contact by bending the stationary breaker point
bracket. Do not bend the breaker arm. See figure
4-12.
Figure 4-12. Aligning Breaker Points
4-25

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