Onan NHC Series Operator's/Service Manual And Parts Catalog page 279

Provide room for the clutch adapter casting by
plugging the wet holes with a 3/8-16 x 1/2-inch slotted
headless set screw. Apply-sealing compound to the
threads and install screw flush with the cylinder
block.
Drill a 13/64-inch hole (orfiled slot) in the crankshaft
for the clutch set screw. Locate center of hole 11/32-
inch from the end and directly opposite the keyway in
the crankshaft.
Install the clutch adapter, with drain slot downward,
using two cap screws 3/8-16 x 2-inches on the lower
and one cap screw 3/8-16 x 1-3/4-inch on the upper #2
cylinderside (cylinder nearer clutch). Install the3/8x
3-7/8-inch stud through the adapter into the engine
block upper remaining hole. Use a lock washer on
each assembly screw. Use a flat washer and a lock
washer under the stud nut.
Install the crankshaft key. Remove the clutch set
screw. Install the clutch assembly (less housing) to
the crankshaft, driving it on carefully with a soft-faced
hammer until set screw hole is aligned. Install set
screw to bottom in crankshaft hole, then back it out
one full turn. Tighten clutch retaining screws until
clutch is clamped securely to crankshaft. Lock the
screws and tighten the set screw.
Apply grease to splined power takeoff shaft. Position
the clutch throw-out to align the grease fitting with
the hole in the housing (#1 cylinder side, horizontal).
Pull the throw-out collar outward to remove tension.
Install the clutch housing sothattheclutch throw-out
fork engages the throw-out collar. Be sure the
serrated shaft is properly meshed with the clutch
plate. Use two cap screws 7/16-14 x 2-inches on the
lower and one cap screw 7/16-14 x 1-3/3-inch on the
upper #2 cylinder side. Install the stud washer and
nut. Lubricate the two grease fittings just until grease
appears.
BATTERY CONNECTIONS (Engines with
Automotive Type Separate Starter)
Connect the 12 volt battery positive cable to the
engine start switch terminal. Connect the battery
negative cable to the ground point on the engine oil
base (Figure 6).
B A T T
P O S I T
C A B L
I V E
C A B L E
( F A S T E N U N D E R C O N V E N I E N T
B O L T O N E N G I N E )
F I G U R E 6. B A T T E R Y C O N N E C T I O N S
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