Onan NH User Manual

9.
10.
Engines without a governor low speed adjustment
screw require no further
low speed adjustments.
Engines with a governor low speed adjustment
screw require the following low speed adjustment:
A. Check to see that the governor linkage moves
freely and is not binding.
B. Adjust the governor low speed adjustment screw
to obtain
1200 rpm.
Check the main mixture adjustment (sidedraft and
LUA carburetors only) by rapidly accelerating the
engine from idle to full speed. The engine should
accelerate evenly and without hesitation. If it does
not, turn the main adjustment screw out in
1 /8 turn
increments until the engine accelerates smoothly,
but do not turn it out more than
1 /2 turn beyond the
original setting.
THRCI~I~STOP~ CARBURETOR
Cii
I\
GOVERNOR CONTROL
LINKAGE
GOVERNOR
SPRING GOVERNOR
GOVERNOR LO
SPEED ADJUSTMENT
[g!$$gvz
STOP SCREW
SCREW
FIGURE 12. IDLE SPEED ADJUSTMENT
Float Adjustment
An exceedingly high float setting will usually result in an
engine that is hard to start when warm. If the setting is
too low, the engine may not receive enough fuel under
sudden acceleration or load change. Adjust setting as
follows:
1. Disconnect throttle control, choke leads, breather
hose, air cleaner inlet hose, and fuel line from
carburetor.
2. Remove the four bolts that hold the intake manifold
assembly in place and remove the complete
carburetor and intake manifold assembly as one
unit Then remove carburetor from intake manifold
for easier handling when checking float level.
3. Separate the upper body of the carburetor from the
fuel bowl section.
4. Measure float level (Figure 13).
5. If the setting is incorrect, remove the float assembly
to adjust. Bend the assembly slightly at the location
specified in Figure
13.
71 Attempting adjustments wifh
ACAUT'oN
the float assembly installed may
result in deformation of the inlet needle and seat.
NEEDLE BEND FLOAT
AND
SEAT TANG HERE
BEND TAB
1/8f1/16 INCH
BOWL ~LANGE
GASKET
A91 3rw.
SIDE DRAFT CARBURETORS
U
FLOAT LEVEL ADJUSTMENT
WITH FUEL
NlKKl
carburetor with limited idle mixture adiustment
BEND FLOAT
STRAIGHT TAB HERE WALBRO
Ffg::f BEND FLOAT ARM
I HERE TOADJUST
MINIMUM BEND FLOAT ARM
FLOAT DROP HERE
TO ADJUST
NO FUEL
FS-1683
FUEL LEVEL
0.25 INCH
NO FUEL
FLOAT LEVEL ADJUSTMENT LUA CARBURETORS
FIGURE 13. FLOAT LEVEL ADJUSTMENT
FLOAT DROP ADJUSTMENTS
4
FS1524
16

Onan NH Specifications

General

Brand	Onan
Model	NH
Category	Engine
Language	English