Onan NH Instruction Manual

OPERATOR'SMANUAT
AND
PARTS
CATALOG ETECTRIC
GENERATING
PTANTS
FOR RECREATIONAL
SERTES NH
vEHrctEs
0 NAN' 14ooz3
R
D
AvEN
u
En..=;,,,r,,,1f.,
*L:*rf,':"r, MIruN
EsorA
8s432
940-310 6A.D72

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lilIn0DUCIt0ll
THISOPERATOR'SMAI{UAL
CONTAINS
IT{FORMATION
PERTAINING
TOTHEINSTALLATION,OPERATION,AND
MAINTENANCEOFYOUR
ONANUNIT. A PARTSCATALOGISALSO INCLUDED
IT{THIS
MANUAL.
t{E SUGGESTTHATTHIS MANUALANDTHEWIRINGDIAGRAMITHICH
ACCOMPANIESEVERYONAi{UNITBERETAINED
ANDREFERRED
TOWHENMAKING EOUIPMENT
ADJUSTMENTS
OR
ORDERINGPARTS.
ADDITIONALCOPIES
AREAVAILABLEFOR
A NOMINAL CHARGE
FROM
YOURONANDISTRIBUTOR,
WHENORDERING
PARTSREMEMBERTO INCLUDETHE ONAN
MODEL,SPECIFICATION
LETTER,
AND
SERIALNUMBER
LOCATED
ONTHENAMEPLATEOFYOURONAT{UNIT,THISISESSENTIALTO
ENSURETHECORRECTPARTIS
SHIPPED
TOYOU.
FORMAJORREPAIRSERVICE,CONTACTYOURONANAUTHORIZED
DISTRIBUTOR.

-
TABTEOFCONTENTS
TITLE PAGE
GeneralInformation..,. ...... 3
Specificatiols 5
Dime[sionsandClearances ,,.,,., 6
ools... 8
Installation
Operation
Adjustments
ServiceandMaintenance.
Parts Catalog
AssemblyTorquesandSpecialT
EngineTroubleshooting
Guide
LISTOFILLUSTRATIONS
Typical MobileInstallation
OnanVibration Isolators .
Battery andCround
Connection . . . . .
Load Connections
RemoteStart-Stop
Switch
Solid-StateControlBoard
Ignition Timing andBreaker
Points . .
Carburetor
Adjustments
Zenith Carburetor
Float Adjustrnent
SissionChoke
GovernorAdjustments
TappetAdjustment
Oil PressureRelief Valve Adjustment
Oil Level Indicator
Oil Filter
Air Cleaner
CrankcaseBreather .
Spatk
Plug Gap
CeneratorBrushes .
VacuumSpeed
Booster ,
Governor
BalI Joints
Fuel Filter
9
10
15
t7
22
26
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figute 10.
Figure
11.
Figure 12.
Figure 13.
Figure 14,
Figure 15,
Figure 16.
Figure 17.
Figure 18.
Figure 19,
Figure20.
Figure
21.
Figure 22.
PAGE
10
lt
12
1J
13
t4
t7
18
18
19
l9
2l
2l
22.
23
23
23
24
ZJ
25

I
GENERAL
INFORMATION
INTRODUCTION
This manualincludes iflstructions for the installation,
operation, and maintenanceof the NH electric ge[er-
ating plants used in recreational vehicles. Identify
your model by referring to the MODEL AND SPECIFI-
CATION NUMBER as shown on the Onan nameolate.
Electrical characteristics are shown on the iower
portion of the nameplate.
How to interplet the MODEL and
SPECNO.
/ 12000
D
-T-r
Indicates KW
rating.
Factory codefor Seriesidentification.
Combines
with 1 and2 to indicate model.
3 - 120/240 voltage.
C - Indicates reconnectiblefeature.
R - REMOTE. Electric starti[g at the set or froma
remote location.
4, Factoty code for optional equipmentaddedto unit,
5. Specification (Spec) letter. Advanceswher factoly
makes production modifications.
Onanelectric plants are give[ a completerunningtest
urder various load conditionsandare thoroughlycheck-
ed before leaving the factory. Upor receipt of yout unit
check it thoroughly for any damage that rnay have
occurred during shippiflg. Tighten loose parts, teplace
missing parts, and repair any damagebefore putting
the unit into oDelation.
3CR
---'t-
I
NH
T
2
5.5
T
I
1.
2.
3.
iIANT
TACTIRTR'S
W{RR{IITY
ot vt R(:lr
r\Trrrr.rTr { r,{tl(rr\r

!
BREAKER POINT
BOX
SOLID STATE CONTROL
AIFI CLEANER
SISS
ON
CHOKE
TIMING
ACCESS hOLE
.-AC OUTPUT BOX
ANO PLANT GROUND
TERMINAL
VACUUM SPEE
BOOSTER GENERATOR
o cooLtNG
0\2
START S
OLENOID
ELECTRIC
FUEL PUMP
IBRATION 15
OLATOR
IL DRAIN
TYPICAL
NH
FOR
RECREATIONAL
VEHICLES
4

!
SPECIFICATIONS
C
ylinder Bore (inches),
Number
of Cylinders
ENGINE
llorsepower
Maximum
Minimum
CubicInch D
isplacement.
5.5
NH
14.0
bhp
@
1800
RPM
2
60
3-9/t6
3
7.0
to1
1800
Battery
12
Volt
One
74amp/ht.
Two-Step
6amp.
1.5
amp.
Excite!
Cranking
Regular
Grade
withFilter Change)
5%(3Hettz)
65
00
27.1+
1.0
JJ
20-13
/16 "
1l -1/) "
350lbs.
Piston Stroke(inches)
Compression
Ratio
RPM(60
Hertz)
Battery Voltage
BatterySize
SAEGroup
60
SAERating - 20 Hour
(nominal)
BatteryChargeRate
StaftirlgSystem
Oil Capacity(Quarts) . . 4.0 (4.5
Fuel
GENERATOR
ACVoltageRegulation.
ACFrequencyRegulation
(No
Load
toRated
Load)
60HertzRecreational Vehicle Rating(watts)
Cunent Rating (amperes)
Phase
PowerFactor
sETDI
Length MENSIONS
(Approximore)
width
Height
Weight
NOTE: Hertz is a unit of frequency equalto onecycle persecond,
+ Reconnectibleto deliverratedoutput
at 120 volt, 2
wite (54.2amp);
240volt, 2wite (27.1
amp).

!
DI'NENSIONS
AND CTEARANCES
ALL
CLEARANCESGIVENAT
All dinensions ininches
V
alve TappetClearance
ln
lake
.
Exhaust
.
Valve Stemin Guide
- Intake
Valve
Stem
in Guide
- Exhaust
Valve Spring
Length
Free
Lenglh.
C
ompressed
Lenglh
.
ValveSpringTension(lb.
)
Open
C
losed
Valve SeatBore Diametet
lnl ake.
Exhaust.
Va1veSeat Diameter
lnt
ake
,
Exhausl
.
Val i,e Slem Diameter
Intake.
Exhaust
Valre Guide
Drameter
(1.D.)
Valve Lifter Diameter
Valve Lifter Bore
Valve Seat lnlcrference
liidlh
Valve FaceAngle
Valve Seat Angle
Valve Interference Ang
Ie.
Cranksha! Main Bearing.
Crankshaft ti nd Play
CamshaflBearing
Camshafl lind Play
( umshaftLrft
Camshaft Bc.rring Diameter
Camshalt J ournal Diameter
I?od Beari ng (Forged Rod)
Connecting
Rod End Play (Ductile lron).
'I'i
miog Gear
Backlash
Oil Pump
GearBacklash.
I)is1on
to Cylinder, StrutType (Measured
below oil-controlling ring -
90 frompin) Clearance
l)iston Pio [)iameter
Pi
ston Pin in Piston.
Pist on Pin in Rod
Piston Ring Groove
Width
Top
l.
Top2.
Top3.
Piston Ring Gap in Cylinder.
Piston Ring Side Clearance(Top compression
ring only)
Breaker Point Gap (Full Separation).
SparkPlug Gap - For Gasoline
Fuel
ROOMTEMPERATURE
OF
70"F
unless olherwise soeci{ied. Minimum Moximum
0.003
*
7l
38
0.0010
0.0025
1.5645
1
.2510
1.569
0.3125
0.3410
0.344
0.7475
0.7505
r/32
0.002s
0.005
0.0015
0.003
1.3760
1.3740
0.0005
0.002
0.002
0.002
0.0015
0.75
00
0.0001
0.0955
0.0955
0.1880
0.010 0.006
0.020
0.025
0.010+ 0.0025
0.0M0
1.662
1.375
79
42
1.5655
1.2s20
1.570
t.256
0.343
0
0.3415
0.346
0.7480
0.7s
15
3/64
44"
45"
0.0038
0.009
0.003
0
0.033 1.3770
r.3745
0.0023
0.016
0.003
0.005
0.0035
0.7502
ThumbPush
Fi t
0.0005
0.0965
0.0965
0.1890
0.020

!
Crankshaft
Main
Bearing
Journal
- StandardSize
Main
Beari
ng
D
iameter
.
Main
BearingClearance
Crankshaft
Rod Bearing
Joumal - StandardSize
Cylinder
Bore
- StandardSize.
Ignition Tirning(Without
AutomaticSparkAdvance)
Stopped(Vith Automatic SparkAdvance)
Running
(WithAutomaticSpark
Advance).
Magneto
Pole ShoeAir Gap
*1.001
"
t.9992
2.0015
0.0015
t.6 2
22"BTC
3
OATC
22"B"tC
0.010
2.0000
2.0M0
0.0043
r.6260
3.5
635
0.015

!
ASSETNBTY
TORQUES
AND SPECIAT
TOOTS
TORQUE
Assembly torques as given here require the use of a
torque wrench. These assembly torques will assure
propertightness without danger of strippingthe threads.
If a torque lvrench is not available, you will have to
estimate the degreeof tightness necessary
for the stud,
nut or screw being installed andtighten accordingly.
Be
careful not to strip the threads. Check all studs, nuts
and screws often with the engine cold. Tighten as
needed to prevent them frorn working loose.
Special Place Bolts do not require lockwashers or
gaskets. Never attempt to use a lockwasher with these
bolts, it will defeattheir purpose.Check all studs, nuts
and screws often. Tighten as needed.
R€C
ESS
UNDER
HEAD
TOROUE
SPECIFICATIONSINLB-FT
SPECIAL
TOOLS
These tools are available fromOnan
to aid
repairwork.
Crankshaft
GearPullingRing.... .....
MainCrankshaft
Bearing
Driver
Frontand
Rear
.
Camshaft
Bearing
Driver
Ftont..
Rear
Valve Seat
Driver .
Valve SeatStaker
Intake.
. .
Exhaust
serviceand
. 420A248
. 420867
. 420A66
. 420A307
. 4204308
. 420A3 09
. 420A310
. 4208311
. 4 208181
. 420A314
. 420A315
Valve SeatCutter .
Oil Seal Guide
andDriver. . . .
Camshaft
Bearing
Remover . .
Crankshaft
BearingRemover. . .
Connecting Rod Bolt
FlywheelMountingsctew..........
F ur-l
Pump[lounting Screws
Oil Pump
Ccarcase
Cover
Ii(.arBeaong
PIate ..
Oil Base l\4odnl
Ing Screws.
CylinderHeadBolt....
SparkPlugs.
Valve Cover N ut .
Manifold Screws - lotake and Exhaust . .
Magneto
Stator
Screws . .
Carbureror Moun ting Stud Nuts
ArmatureThrough
Stud
Nur ,
GeneratorThroughStud
Nut.. .. .....
Blower Housrn
g Screws
Generator Adapter - To Cylindet Block . . .
Starter
Bracket - To Oil Base
>
'/e-4
Min. Max.
27 29
35 40
56
79
8 10
25 27
18 23
17 19
15 20
48
16 23
8 10
812
35 40
74 16
10 15
15 18
43 48