Inspection; Governor Gear Installation; Crankcase Cover Installation - Generac Power Systems GN190H Service And Repair Manual

for (a) oil pump rotors and camshaft, (b) crankshaft, (c) gov-
ernor gear assembly and (d) the oil pickup assembly. Cored
oil passages are provided from the pickup bore to the pump
and from the pump to the crankshaft bore.

INSPECTION:

Clean the cover and blow dry with compressed air. Use com-
pressed air to blow out all oil passages. Inspect the cover for
cracks, damage, etc. Check the crankshaft and camshaft
bearing bore diameters as outlined in Section 11.

GOVERNOR GEAR INSTALLATION:

1. Apply engine oil to the governor gear shaft (Figure 12.8).
2. Install the governor gear thrust washer over the governor
gear shaft followed by the governor gear assembly.
3. Slide the governor retainer ring to a distance of 8mm
down over the governor gear shaft.
4. Lift the gear assembly up to the governor retainer ring.
5. Install the spool over the shaft so that the flange is under
the flyweights.
6. Slide the governor gear assembly, retainer ring, and spool
down the shaft until bottomed out.
FLYWEIGHTS
GOVERNOR
GEAR
THRUST
WASHER
GOVERNOR
GEAR
SHAFT
Figure 12.8 — Governor Assembly

CRANKCASE COVER INSTALLATION:

Install the crankcase cover as follows:
1. Rest the crankcase on its side with the crankcase cover
flange facing upward.
2. Check that the valve tappets, crankshaft and camshaft
have been properly installed into the crankcase.
SPOOL
GOVERNOR
RETAINER RING
GOVERNOR
GEAR ASSEMBLY
3. Make sure the timing marks on the crankshaft and camshaft
gears are properly aligned.
4. Place the crankcase cover gasket onto the crankcase flange.
5. Apply engine oil to the crankshaft and camshaft journals.
6. Apply engine oil to the crankshaft and camshaft bores in
the crankcase cover.
7. Insert tubular end of oil pickup into its crankcase cover bore.
The pickup screen must face downward and the pickup
must be parallel with the cover flange.
NOTE: When the crankcase cover is installed, the groove
at tip of pickup must mate with a cast protrusion on
the crankcase floor. The pickup must be properly posi-
tioned to ensure it will be retained by the cast
protrusion after the cover has been installed.
8. Make sure the camshaft bore in crankcase cover and the
oil pump's inner rotor shaft have been coated with oil.
9.Apply a small amount of general purpose grease to the
oil pump inner rotor. The grease will help prevent that
rotor from dropping out when the cover is inverted for
installation.
10. Install the oil pump inner rotor over the rotor shaft and
into the camshaft bore.
11. Install the oil pump outer rotor onto the two drive pins
at the of the camshaft (see Figure 12.10, next page).
CRANKCASE
COVER BOLTS
OIL PICKUP
ASSEMBLY
OIL PUMP
OUTER ROTOR
Figure 12.9 — Reassembly of Crankcase Cover and Oil
49
SECTION 12: LUBRICATION
OIL PUMP
INNER ROTOR
CRANKCASE
GASKET
Pump