Piston Assembly; Installation Of Piston In Cylinder - Onan T260G Service Manual

PISTON ASSEMBLY
Lubricate all parts with engine oil.
Position piston on its respective rod and install the
pin.
Install the rings on the piston's starting with the oil
control ring (Figure 26). Use a piston ring spreader
to prevent twisting or excessive expansion of the
ring.. Compression rings have a dot or the word
"top" on one side of the ring to indicate which side
faces the top of the piston. Unmarked piston rings
can be installed either way. The oil control ring has
an expander; install the expander first and then
close until the expander ends butt. The joint should
be 180 degrees from the gap of that ring.
FIGURE
26.
PISTON RINGS
INSTALLATION OF PISTON IN CYLINDER
1.
2.
3.
Turn the crankshaft to position the number one rod
bearing journal at the bottom of its stroke.
Lubricate the number one piston assembly and
inside of the cylinder. Compress the rings with a ring
compressor (Figure 27).
Position the piston and rod assembly in the cylinder
block. Notched side of connecting rod must face
camshaft; rod bolts must be off-set toward outside
of block.
4. Tap the piston down into the bore with the handle
end of a hammer until the connecting rod is seated
on the journal (Figure 27). Install the bearing cap on
the rod. Install and tighten the nuts evenly, in steps,
to the specified torques.
OIL HOLE
CAMSHAFT
TOWARD
CT-1077
FIGURE 27. INSTALLING PISTON AND
CONNECTING ROD
5. The bearing cap must be tapped to properly align it
with the rest of the connecting rod. Clearance varies
on the journal if this is not done.
6. Install the remaining piston and rod in the same
manner. Crank the engine over by hand to see that
all bearings are free.
7. Install the oil base with a new gasket.
8. Install the cylinder heads. See Cylinder H e a d
section for torques and torquing procedure.
9. Replace oil and break in engine.
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