Proheat M125 - Manual (Page 52)

Fuel Regulator and Inlet Screen Plate – Check:
a) Check Regulator for damage and/or contamination.
b) Check Regulator Screen Plate for contamination.
Procedure – Fuel Regulator removal, inspection and reinstallation:
a) Disconnect all harnesses at the G-II PCM.
b) Disconnect the fuel supply line.
c) Loosen and back out the burner head mounting (2) bolts five to six turns
allowing enough room to rotate the burner head 15° counter-clockwise
and remove.
START: Fuel System Step 6
(1 Flash)
Figure 4-16: Burner Head Removal and Fuel Regulator Removal.
WARNING
Spilt fuel is flammable.
WARNING
DO NOT disassemble the regulator.
No user serviceable parts. Attempts
to open or repair may lead to unsafe
operation.
MOUNTING EARS (2)
MOUNTING BOLTS (2)
TORQUE = SEE SECTION 1.3
COOLANT PUMP
SWITCH INPUT
DUAL MODE TEMP
SENSOR
POWER
FUEL INLET
4-15 PROHEAT M-SERIES G-II PCM SERVICE MANUAL
d) Remove the Ignition Electrode then the Flame Shield.
c) Disconnect the Fuel Solenoid Valve from the PCM.
e) To prevent contamination, clean area around the base of the Fuel Delivery
Block prior to disassembly. Blow all loose debris off with compressed air
prior to disassembly
f) Remove the Fuel Delivery Block by removing the three M6 screws and
three Lock Washers. Be careful not to lose the gears or Idler Shaft.
g) Remove the two screws holding the Fuel Regulator and Screen Plate to
the Fuel Delivery Block and remove.
h) Inspect Screen Plate, Regulator and all O-ring seats for contamination
and/or damage. Replace if necessary.
k) Reassembly.
Using new O-rings assemble Fuel Regulator Screen Plate and Fuel Regulator
using 2 x M6 Lock Washers and 2 x M6 x 1 x 30 screws. Apply Loctite ® 242 to
bolts. Torque to 75±7 in-lbs. Note orientation of fuel regulator screen plate.
l) If required, re-install the two Gears and Idler Shaft into the Compressor
Flange ensuring the area is clean and free of debris. Lubricate both Gears
with diesel fuel prior to installation.