6
CALIBRATION
The meter is accurately calibrated at the
factory for use with diesel fuel� Due to
differences in viscosity and ow rates,
the meter may require recalibration
to measure other fuels or to adjust
for inaccuracies� A gear replacement
kit is available (PN 139500-15, see
Illustrated Parts List section) to
convert the meter to unleaded fuels�
1� To adjust the calibration of the me-
ter, gain access to the calibration
screw by performing the
following: (see Figure
5a
)
2� Remove the back plate and the
(4) screws retaining it� The O-ring
seal under the plate must not be
damaged�
3� Using the 5mm hex L-wrench
provided with the meter, adjust the
calibration screw as required�
4� Note: The calibration screw set-
ting may have been adjusted at
the factory� The gasoline setting
is approximately fully closed (turn
clockwise)� Do not overtighten the
screw against the seat�
figure
5a
5� Reinstall the plate, (4) screws
and the O-ring seal if removed�
Tighten (4) screws to 42-46 lb-in
[4�7-5�2 N
•
m] torque�
MAINTENANCE
The meter’s strainer should be cleaned
at regular intervals, especially if reduced
ow is encountered�
Clean or Replace Strainer
1� Remove the socket screws at the
inlet fitting� Remove the fitting, O-
ring and strainer� (see Figure 5
b
)
figure 5
b
2. The strainer rim is pressed into the
housing inlet but can be removed
by carefully grasping the end with
pliers and pulling with a wiggling
motion until free�
3. Using a fine brush, clean the strainer�
Replace the strainer as necessary�
4� Wipe the housing inlet and re-
install the strainer by pressing it
into place with the end of a 1”
pipe nipple (or 1" electrical conduit
for QM40) or similar tube tool using
light hammer taps�
CAUTION
The mesh strainer must always be
installed when operating the meter;
otherwise, particles may enter the
meter chamber and disrupt the
operation of the oval gears�
5� Wipe the fitting and O-ring groove
clean� Coat the O-ring with oil or
light grease and seat into the
fitting groove�
6� Reinstall the inlet tting and screws�
Tighten screws to 42-46 lb-in
[4�7-5�2 N
•
m] torque�
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