Kohler K91 Service Manual page 50

LOCK-OFF
6-35.
Figure Models S a n d SO Secondary
Regu lators.
NOTE : The lock off adjusting screw may be used
while the engine is idling.
to adjust fuel flow
adjust at any speed above idle .
I f the regulator being adjusted i s a Model S or
5 .
SO , depress the primer button for an instant .
This will allow air to flow through the regulator.
!
- - - - _ _ _ _ _ _
LOCK-OFF
ADJUSTMENT
DIAPHRAGM SPRING
FUEL INLET
6 .2 4
!�
1
_ _ _ _
+
FUEL
OUTLET
Never
I
I
I
I
1
I
1
6-36.
Figure Model
Check that air flow stops when the primer is
6 .
released.
7 . If air flow does n o t stop completely, loosen t h e
adjustment screw lock nut and turn t h e adjust­
ment screw in until air flow stops , then one
more full turn .
8 . Repeat steps 5 through 7 until air flow stops
every time .
9 . Tighten adjustment screw lock nut .
Primary Regulator
The primary regulator provides initial control of the
fuel under pressure as it comes from the fuel sup­
ply tank. The i nlet pressure for primary regulators
should never exceed 250 psi . The primary regula­
tor is adjusted for outlet pressure of approximately
6 ounces per square inch ( 1 1
lator does not function properl y , replace it or have
it serviced by an authorized gas equipment shop.
Never a ttempt to service a faulty primary regulator .
Upon demand for fuel , pressure drops on the out­
let side of the regulator d iaphragm . The gas i nlet
valve then begins to open , allowing fuel to pass
through the regulator to the secondary regulator.
As the need for more fuel increase s , the fuel i nlet
valve opens further, allowing more fuel to pass .
Refer to Figure 6-37 .
Pressure may b e adjusted b y removing t h e bonnet
cap and turning the spring tension adjustment with
a large screwdriver. Turning clockwise i ncreases
the pressure ; turning counterclockwise decreases
i t .
KN Secondary Regulator.
I I W . C . ) . If the regu­
IAPHRAGM
VENT