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Page Title: Section V. CONNECTING ROD PISTONS AND RINGS
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TM 5-4110-217-14
g. Check the rotators periodically by removing the
smaller diameter of the tapered valve guides must face
toward the valve head.  Install 0-ring (173) on intake
cylinder heads and cranking the engine.
When
valve side only.
functioning properly, the valve is rotated a fraction of a
c. Install valves (177) & (178) through aligned holes
turn each time it opens. If rotators are faulty, install new
of valve guides from which removed.
ones.
d. Install valve spring (172) and valve rotator (170)
5-20. Installation.
& (171). Depress springs with valve spring compressor,
NOTE
Onan Part No. 420-0119, and lock spring in place with
Refer to paragraph 1-5 for dimensions
valve spring washer lock (169).
and clearances prior to valve installation.
e. Install valve tappet cover (157) using four bolts
(158) and washers (159).
a.
If replaced, install tappets (168) in valve
f. Install cylinder head (para. 5-15c).
chamber from which removed.
b. If replaced, install valve guides (174) in valve
ports of crankcase from which removed. The
.
Section V. CONNECTING ROD PISTONS AND RINGS
5-21. General.
The engine is a two cylinder engine equipped with
two connecting rods, two pistons, and two sets of rings.
The connecting rod is aluminum and comes equipped
with bushings and place bolts. The piston comes with a
piston pin and pin retainer. The ring set is made up of
two compression rings, one oil control ring with an
expander.
5-22. Connecting Rod, Piston, and Piston Rings.
a. Removal (fig. 3-11).
CAUTION
Whenever there is a noticeable wear ridge
at the top of each cylinder, remove the
ridge with a ridge reamer before removing
the pistons. If the ridge is not removed,
the rings can catch the ridge when the
pistons are pushed out and cause a ring
land fracture (fig. 5-19).
(1) Remove engine accessories and other
Figure 5-19. Wear Ridge on Cylinder Wall (Model RMP-
major  assemblies  and  components  described  in
J/l-10G)
(2) To remove the piston and connecting rod
assemblies, turn the crankshaft until a piston is at the
NOTE
bottom of the stroke. Bend out tabs on lockwasher (195)
Keep the connecting rod bearing caps
to release screw (196). Remove the screw (196) and
and bearings with their respective rods
washer (195) from the connecting rod. Lift out the rod
Tag each piece.
bearing cap (197) from the rod.  With the end of a
hammer, push the rod and piston assembly out of the
b. Disassembly.
cylinder.
(1) Using a piston ring spreader tool, remove
CAUTION
piston ring set (207) from piston (206).
Be careful not to scratch the crackpin or
(2) Remove retainer ring (203) from piston pin
the cylinder wall when removing the
(204) in piston (206). Push out piston pin. Separate
parts.
piston from connecting rod (197).  Drive piston pin
bushing (205) from connecting rod (197).
Change 3 5-12

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