Onan JC Service Manual

ASSEMBLY TORQUES AND SPECIAL TOOLS
ASSEMBLY TORQUES
The assembly torques given here will assure proper
tightness without danger of stripping threads. If a
torque wrench is not available, be careful not to strip
threads. Use reasonable force only and a wrench of
normal length.
Specially designed place bolts do not require a
lockwasher or gasket. Check all studs, nuts and
screws often and tighten as needed to keep them from
working loose.
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TORQUE SPECIFICATIONS (Ft. Lbs.)
Center Main Bolt (4 cylinder). ............. 97-102
Connecting Rod Bolt ...................... 27-29
Cover-Rocker Box .......................... 8-10
Cylinder Head Bolt ........................ 28-30
Exhaust Manifold Nuts.. .................. 13-15**
Flywheel Mounting Screw. ................. 65-70
Hub-to-Flywheel Screws (4 cylinder) ....... 17-21
Fuel Pump Mounting Screws.. ............. 15-20
Gear Case Cover .......................... 18-20
Intake Manifold. ........................... 13-15
Oil Base Mounting Screws ................. 45-50
Oil Filter ................... Hand Tight + 1/2 Turn
Oil Pump Mounting Screws
................. 15-20
Rear Bearing Plate.. ....................... 40-45
Rocker Arm Nut.. ......................... 4-IO*
Rocker Arm Stud .......................... 35-40
Spark Plug ................................ 25-30
PLACE BOLTS
SPECIAL TOOLS
These tools are available from ONAN to aid service and
repair work.
Driver, Valve Seat
....................... .420-0270
Oil Seal Guide and Driver.. .............. .420-0456
Valve Seat Remover. .................... .420-0311
Replacement Blades for 420-0272 ........ .420-0274
Crankshaft Gear Pulling Ring ............ .420-0248
Driver, Center Camshaft Bearing (JC only) . .420-0254
Driver, Combination Main and Cam ........ .420-0326
Reamer, Ridge. ......................... .420-0260
Valve Guide Remover and Driver ......... .420-0300
- This torque isfrorn friction between thethreadsonlyand locks
the nuts in place. The rocker arm nuts are
for adjusting valve
lash.
- I lyiliari riuis averiiy io avoia rnaniioio oarnage.
.. -.
OPTIONAL EQUIPMENT
1. Solenoid Shift Starting Motor - 12 volt or 24-32
volt; less solenoid switch.
2. Auto-Cycle Starting Motor - 12 volt DC or 120
volt AC; 18 to 1 gear reduction; gear train
lubricated by crankcase oil; one-way, sprag-type
engaging clutch.
3. Flywheel Alternator - For battery charging;
integral; no brushes or commutator; two step
regulator; maximum charge rate at 2400 rpm; 14.5
amperes into 70 AH discharged battery.
4. Low Oil Pressure Cut-Off - Shuts down plant if
oil pressure fails. Crankcase oil level must be
checked regularly.
5. Two-Speed Governor - Two springs for low- and
high-speed control of engine.
6. Gas-Gasoline Carburetor - One carburetor with
gasoline and gaseous fuel provisions. Available
as a factory modification or
as a field conversion
kit.
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Onan JC Specifications

General

Brand	Onan
Model	JC
Category	Engine
Language	English