Onan NHC Series Operator's/Service Manual And Parts Catalog page 7

ASSEMBLY TORQUES
TORQUES
Assembly torques as given here require the use of a
torque wrench. These assembly torques will assure
proper tightness without danger of stripping the
threads. If a torque wrench is not available, you will
have.to estimate the degree of tightness necessary for
the stud, nut or screw being installed and tighten
accordingly. Be careful notto strip the threads. Check
all studs, nuts and screws often with the engine cold.
Tighten as needed to prevent them from working
loose.
TORQUE SPECIFICATIONS Ft.-Lb.
Cylinder Head Nuts 17-19
Rear Bearing Plate 25-28
Connecting Rod Bolt 27-29
Flywheel Capscrew 35-40
Starter Mounting Bracket to
Oil Base Screws 43-48
Gear Case Cover 8-10
Oil Pump 7-9
Other 3/8 Cylinder Block Nuts 18-23;.
Intake Manifold 18-20
Exhaust Manifold 10-12
SPECIAL TOOLS
SPECIAL TOOLS
These tools are available from Onan to aid service and
repairwork.
Crankshaft Gear Pulling Ring .420-0248
Flywheel Puller... 420-0100
Combination Bearing Remover,
Main and Cam 420-0325
Combination Bearing Driver,
Main and Cam 420-0324
Valve Guide Driver 420-0300
Valve Seat Driver 420-0308
Valve Seat Staker
Intake : 420-0309
Exhaust 420-0310
Valve Seat Cutter 420-0311
Oil Seal Guide and Driver
Bearing Plate 420-0181
Gear Cover 420-0313
Timing Advance Mechanism
Cover Driver 420-0296
Piston Ring Spreader 420-0146
Piston Groove Cleaner 420-0332