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Onan NH User Manual
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Service
Manual
Engine
940-0751
NHC,
NHCV
Spec
E
NH
(RV)
Spec
J-P
4-87
Printed
in
USA
2
Table of Contents
Safety Precautions
2
Table of Contents
3
General Information
4
Engine Model Reference
4
Specifications
5
Dimensions and Clearances
6
Assembly Torques and Special Tools
8
Engine Troubleshooting
9
Ventilation
10
Open Air Installation
10
NHC. NHCV Installation Guidelines
10
Exhaust
11
Carburetor Air Intake
11
Mounting
11
Vacu-Flo Scroll Positions
11
Battery Connections
12
Connecting the Load
12
Clutch Installation
12
Belt Drive
12
Battery Connections (Engines with Automotive Type Separate Starter)
13
Out-Of Service Protection
13
Returning Unit to Service
13
Oil Filter Change
14
Oil System
14
Crankcase Breather
15
Pressure Lubrication
15
Oil Pump
15
Oil By-Pass Valve
16
Carburetor Adjustments
17
Mixture Adjustments
17
Fuel System
17
Float Level Adjustment
18
Idle Speed Adjustment
18
Float Adjustment
18
Carburetor Overhaul
19
Carburetor Cleaning and Repair
19
Carburetor Reassembly and Installation
20
Fuel Pumps
21
Mechanical Fuel Pump Test
21
Pulse Pump Test Procedure
21
Pulse Pump Test Specifications
22
Pulse Pump Repair
22
Mechanical Pump Removal and Repair
22
Electric Fuel Pump Test and Repair
24
Fuel Shutoff Valve
25
Fuel Filters
25
Electric Choke
26
Air Cleaner
27
Linkage
28
Governor Adjustment
28
Sensitivity Adjustment
29
Variable Speed Governor Adjustment
29
Speed Adjustment
29
Breaker Points
30
Continuity Test
30
Ignition and Battery Charging
30
Ignition Coil
31
Spark Plugs
31
Specific Gravity Test
32
Battery Inspection
32
Flywheel Alternator
32
Battery Jump Starting
32
Testing or Servicing
33
Alternator Output Test
34
No Output - Stator Assembly
34
Checking Rectifier Assembly
34
Testing Regulator Assembly
34
Testing Phelon Systems
35
Starter Disassembly and Repair
36
Starting System
36
Brush Inspection
37
Testing Armature for a Short Circuit
37
Exploded View of Starter
37
Pinion Gear and Clutch Removal
37
Testing Armature for Ground
38
Inspecting for an Open Circuit in Armature
38
Testing Field Coils for Grounds
38
Testing Commutator Runout
38
Cleaning Parts
39
Starter Assembly
39
Testing Armature Shaft Runout
39
Shift Lever Installation
39
Adjusting Pinion Clearance
40
Wiring Starter for No-Load Tests
40
Checking Gear Lash
40
Inspection after Overhaul
40
Testing Compression
41
Engine Disassembly
41
Valve System
42
Tappet Adjustment
42
Valve Assembly View
42
Valve Stem and Valve Guide Inspection
43
Valve Guide Removal
43
Valve Stem Seals
43
Valve Guide Installation
43
Valve Spring
44
Valve Rotators
44
Valve Seat Removal
44
Valve Seat Installation
44
Valve Head Margin
45
Valve Interference Angle
45
Valve Face and Seat Grinding
45
Tappets
45
Flywheel
46
Gear Cover
46
Governor Cup
47
Timing Gears
47
Pistons and Connecting Rods
48
Piston Inspection
49
Connecting Rod Inspection
49
Checking Ring Side Clearance
49
Piston Groove Cleaning
49
Cylinder Block Cleaning
50
Cylinder Block Inspection
50
Piston Rings
50
Reboring the Cylinder
51
Cross Hatching
52
Deglazing Cylinder Bores
52
Honing Cylinders (Using Precision Hones)
52
Crankshaft
53
Bearings
53
Front Camshaft Bearing
53
Crankshaft Endplay
54
Oil Seals
55
Piston Assembly
55
Gear Cover and Rear Bearing Plate Oil Seals
55
Piston Rings View
55
Installation of Piston in Cylinder
56
Installing Piston and Connecting Rod
56
Cylinder Head Gasket Replacement
57
Cylinder Head Stud Test and Replacement Procedure
58
Intake Manifold Gasket Replacement
60
Engine Control Wiring Diagram
61
Wiring Diagram for Flywheel Alternator
62
5
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Onan NH Specifications
General
Engine Model
NH
Cylinders
2
Fuel Type
Gasoline
Governor Type
Mechanical
Ignition System
Battery
Starter
Electric
Engine Type
4-cycle, air-cooled
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