Installation; Cylinder Service; Inspection; Reboring The Cylinder - Generac Power Systems GN190H Service And Repair Manual

INSTALLATION:

1. Coat the cylinder walls with clean engine oil.
2. Coat crankshaft crankpin, connecting rod bearing and
connecting rod cap bearing with engine oil.
3. Reinstall the crankshaft.
4. Use a ring compressor to compress the piston rings back
into their grooves in the piston. Rings must be fully com-
pressed.
5. Guide the connecting rod into the cylinder carefully. The
assembly mark on the piston must be toward the flywheel
side of engine (3 o'clock position).
6. When the ring compressor contacts top of cylinder, use a
wood hammer handle to gently tap the piston down into
the cylinder.
7. Check that the connecting rod large diameter bearing is
coated with clean engine oil, as well as the crankpin and
connecting rod cap.
8. Guide the connecting rod large diameter bearing over the
crankshafts crankpin (rod journal).
9. Install the connecting rod cap with its match mark aligned
with identical mark on rod.
10. Install the connecting rod cap bolts and tighten to the
proper torque.
SECTION 10: PISTON, RINGS AND ROD
TORQUE SPECIFICATION
CONNECTING ROD CAP BOLTS
GN-190, GN-191, GN-220
120 inch-pounds or 10 foot-pounds

CYLINDER SERVICE

INSPECTION:

1. Inspect cylinder for dirty, broken or cracked cooling fins.
2. Check cylinder wall for wear, scoring or other damage.
3. Check all bearing surfaces for wear, scoring or other
damage.

REBORING THE CYLINDER:

At the time this Manual was published, oversize pistons and
rings were not available and reboring of the cylinder to an
oversize cannot be done.
CAUTION! DO NOT ATTEMPT TO REBORE THE
CYLINDER. OVERSIZE PARTS ARE NOT AVAILABLE.
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