Section II. FLYWHEEL, GEAR COVER, GOVERNOR CUP, TIMING GEARS AND OIL PUMP

TM 5-4110-217-14

Section II. FLYWHEEL, GEAR COVER, GOVERNOR CUP,

TIMING GEARS AND OIL PUMP

b. Repair. A magneto flywheel which has lost its

5-8. General.

magnetism can be remagnetized. Test by holding the

If engine disassembly is necessary, remove engine from

spark plug wire away from a clean metal part of the

refrigeration unit and first remove all the complete

engine while cranking. The spark should jump a 3/16-

assemblies. Individual assemblies can be removed and

inch gap with ease. Replace magnet (figure 3-17) if

serviced later, if necessary. Refer to Section I for

necessary.

removal of the engine accessories. Most engine repairs

c. Installation. Press on flywheel. Make sure the

will require the removal of blower housing group (13, fig.

steel key (202), (fig. 3-11) is used to lock the flywheel to

3-11) prior to start of defective components repair.

the shaft (199).

NOTE

5-10. Gear Cover (Fig. 3-11).

When disassembling the engine, keep

a. General. After removing the flywheel (127),

all parts in their respective order, such

flywheel key (202), the gear cover (135) can be removed.

as valve assemblies, rod caps for

b. Removal. Remove five screws (135A), (135B),

respective rod and piston assemblies,

and lockwashers (135C) holding gear cover assembly.

etc. Analyze reasons for parts failures.

Gently tap the gear cover with a soft-faced hammer to

Use new gaskets for reassembly.

loosen it.

5-9. Flywheel.

c. Repair. Replace leaking oil seal gasket (148),

a. Removal. To remove the flywheel, turn the

or defective governor shaft and arm (138), governor

flywheel mounting screw outward about two turns and

shaft yoke (139), or roll pin (137).

use Onan puller 420-0100 (or equivalent) and pull

d. Installation (figure 5-11).

flywheel (127, figure 3-11).

CAUTION

When installing the gear cover, make

DO NOT use a screwdriver or similar

sure that the roll pin in the gear cover

tool or pry behind the flywheel against

engages the governor cup correctly.

the gearcase. The gearcase cover is

die-cast material and will break if undue

(1) Prior to installing the gear cover assembly

pressure is applied in this manner.

to the engine, adjust the stop pin to protrude to a point

Handle the flywheel with care. Do not

3/4-inch from the cover mounting surface.

drop the flywheel. A broken fin will

destroy the balance.

Figure 5-11. Gear Cover Assembly Installation (Model RMP- J/l-IOG

5-7