COOLING SHROUD (F10000RG-2)

TM5-4110-234-14

TO 40R7-5-7-1

(1)

Before making governor adjustment, run the engine about 15 minutes to reach normal operating

temperature. If the engine runs with the throttle wide open, either the governor is not properly adjusted or the engine is

overloaded.

(2)

Adjust the carburetor idle needle with no load connected. See paragraph 4-45 for belt removal. The belts

need only be disconnected from the engine. Tie or tape them up out of the way so that they will not be damaged or

contaminated with oil or fuel.

(3)

Adjust the length of the governor linkage.

NOTE

The engine starts at wide open throttle. The length of the linkage connecting the governor arm to the

throttle shaft and lever is adjusted by rotating the ball joint. Adjust this length so that with the engine

stopped and tension on the governor spring, the stop on the carburetor throttle shaft just contacts the

underside of the carburetor bowl. This setting allows immediate control by the governor after

starting. It also synchronizes the travel of the governor arm and the throttle shaft.

(4)

Speed Adjustment. Adjust the governor spring tension for nominal engine speed at no load operation (fig. 4-

35). The no load speed should be slightly higher than the speed under load. A reliable instrument for checking engine

speed is required for accurate governor adjustment. Engine speed can be checked with a tachometer.

NOTE

It is difficult to determine after long usage, if the governor spring has become fatigued. If after

properly making all other adjustments, the regulation is still erratic, install a new spring.

(5)

Sensitivity Adjustment. Check engine rpm drop between no load and full load operation. The drop must not

exceed 100 rpm. To increase sensitivity shift the adjusting clip (fig. 4-35) toward the governor shaft. To decrease it shift

toward the linkage end.

NOTE

Too sensitive a setting will result in a surging speed (hunting) condition (alternate increase and

decrease in engine speed). An opposite setting will result in too much speed variation between no

load and full load conditions. Thus, the correct position of the clip (or stud) will result in the most

stable speed regulation without causing a surge condition.

(6)

Always recheck the speed adjustment after a sensitivity adjustment. Increasing sensitivity will cause a slight

decrease in speed and will require a slight increase in the governor spring tension.

(7)

Throttle Stop Screw. The throttle stop screw should be set at 1/32-inch (0.794 mm) distance from the

manifold when the engine is operating with no load connected (fig. 4-34).

4-66. COOLING SHROUD (F10000RG-2)

Inspect.

a. Check for loose or missing hardware.

b. Check for obvious damage.

c. Replace missing hardware and contact direct support maintenance for any necessary replacements or repairs.

4-83