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T e c h n o l o g y , L L C
DIAGNOSTIC PROCEDURES - HEATER TESTING
Fluid Heater Thermovalve Test
1 . Drain the Fuel Pro completely .
2 . Remove the fluid hoses going to the bottom plate .
These will either be engine coolant hoses or return fuel
hoses . Engine coolant hoses will have to be plugged
when removing them from the Fuel Pro .
3 . Remove the bottom plate .
4 . While looking into the fluid port of the bottom plate
(see Figure 9) flow cold water over the thermovalve for
30 seconds, then run hot water over the thermovalve
and determine if the thermovalve spool is opening and
closing .
5 . Replace with a new bottom plate seal and install the
bottom plate onto the Fuel Pro .
Note: There are two styles of bottom plates .
•
Torque the collar version to 50 to 60 ft-lbs (the use of
2-3 drops of is recommended to secure the bottom col-
lar) . Use seal P/N 101994 .
•
Torque the bolts on the bolt-on version bottom plate to
10 ft-lbs . Use seal P/N 910005 .
6 . Reconnect the fluid hoses to the bottom of the Fuel
Pro .
7 . Fill the Fuel Pro with fuel and restart the engine .
Thermovalve
DAVCO Technology, LLC
Port to view
thermovalve
spool
Figure 9
P. O. Box 487
Saline, MI 48176
TECHNICAL MANUAL
Electric Pre-Heater and Thermoswitch
Tests
Equipment Needed:
•
A precision low resistance Ohm Meter capable of mea-
suring 1/10th Ohm or less is recommended .
•
Current Flow Meter (Clamp-on type for DC current) .
•
Ice, dry-ice, CO
2
switch .
•
A flameless source of heat . Infrared heat lamp, etc . (a
Vortex tube is a good tool to heat and cool for testing) .
� DO NOT USE a test light that has a wire probe for
any of these tests. If the insulation of the wiring is
punctured, moisture and road salt can penetrate
into the wires creating a corrosion issue and
potential failure.
There are various configurations of electric pre-heaters and
thermoswitches available for the Fuel Pro . These include
12VDC pre-heaters, 24VDC pre-heaters, 120VAC pre-
heaters, thermoswitch, and combination pre-heater thermo-
switch . The voltage and wattage ratings are stamped either
on the sheath or the hex of each component for identifica-
tion .
If it is necessary to remove the fuel from the fuel/water
separator:
•
Shut off the engine and set the parking brake .
•
Attach a length of hose to the drain valve and into a
container .
•
Loosen the vent cap on top of the clear housing, and
open the drain valve to drain the fuel into the recep-
tacle .
•
When the fuel is drained, close the drain valve .
Call 800-328-2611
16
FUEL PRO
or some means of chilling the thermo-
www.davco.com
F1271 REV J
October 3, 2016 11:34 AM
382
®
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