Connecting Rod; Assembly And Installation; Assembly - Generac Power Systems GN190H Service And Repair Manual

SECTION 10: PISTON, RINGS AND ROD
Figure 10.5 — Measuring Ring End Gap

CONNECTING ROD

The connecting rod is manufactured of die-cast aluminum.
Marks on the rod and on the rod cap must be aligned when
assembling the rod to the crankshaft.
CAUTION! DO NOT USE A WASHER WHEN ASSEM-
BLING THE ROD CAP.
NOTE: Match marks on the connecting rod and cap
must face up in the general direction of the gov-
ernor shaft when installed (see Figure 10.7).
Figure 10.6 — Match Marks on Rod and Cap

ASSEMBLY AND INSTALLATION

ASSEMBLY:

1. Install the rings (Figure 10.4).
a. Use a ring expander when installing rings into the piston
grooves.
Figure 10.7 — Match Marks Facing Up
b. Install the oil ring assembly first.
c. Install the second compression ring with its chamfer
facing up.
d. Finally, install the top compression ring.
2. Assemble piston, rod and wrist pin.
a. The assembly mark on piston must be toward the engine
flywheel side.
b. Coat the wrist pin, wrist pin bore in piston and the wrist
pin bore in rod with clean engine oil.
c. Install one snap ring into the piston's wrist pin bore.
NOTE: Use new snap rings when reassembling the
piston.
d. Assemble the piston to the rod and slide the wrist pin
through one piston bore, through the rod bore and
through the second piston bore until it contacts the
snap ring.
e. Finally, install the second snap ring to retain the wrist pin
in the piston and rod bores.
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