Onan NHC Series Operator's/Service Manual And Parts Catalog page 214

ASSEMBLY TORQUES AND SPECIAL TOOLS
TORQUES
Assembly torques as given here require the use of a
torque wrench. These assembly torques w i l l assure
proper tightness without danger of stripping the threads.
If a torque wrench is not available, you w i l l have to
estimate the degree of tightness necessary for the stud,
nut or screw being installed and tighten accordingly.
Be careful not to strip the threads. Check a l l 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 20
Connecting Rod Bolt 27-29
Flywheel Capscrew 30-35
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
These tools are available from Onari to aid service and
repair work.
Crankshaft Gear Pulling Ring 420A248
Flywheel Puller . 420A100
Combination Bearing Remover,
Main and Cam 420A325
Combination Bearing Driver,
Main and Cam 420B324
Valve Guide Driver 420A300
Valve Seat Driver 420A308
Valve Seat Staker
Intake 420A309
Exhaust 420A310
Valve Seat Cutter 420A311
Oil Seal Guide and Driver
Bearing Plate . . . .' 420B181
Gear Cover 420B313
Timing Advance Mech. Cover Driver 420A296