WD Catalog 2018

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6-10
Chapter 6 - Service Tools & Their Use
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A thermostat tester has a built in thermometer and a heating element.
You put water and the thermostat in the tester, turn on the heating
element and observe the thermostat to see if it functions. The thermostat
should begin to open at from three to nine degrees Fahrenheit below it’s
rated temperature and should be fully open at the rated temperature.
Other Equipment
The pulley alignment bar and belt tension gauge may already be a part of your
normal tool chest items. They are good tools to have for other service work. In
AC systems, belt alignment and tension are important for efficient compressor
clutch operation and belt and clutch bearing service life.
A fin comb is used to clean bugs and debris from the condenser and evapora-
tor fins and straighten them if they are bent. These combs are made of molded
plastic with a series of grooves to correspond with condenser and evaporator fin
spacing.
The dial-type or digital thermometer is used to measure the temperature at
evaporator fins or the air coming out of ducts. Figure 1-6 in Chapter 1 illus-
trates and describes a typical dial type thermometer.
A variety of compressor service tool kits are available. These contain special
tools needed for clutch removal, compressor tear down, service and repair. To
check compressor oil level you can make your own oil dipsticks or purchase one
for each type of compressor. Three of these and their uses are illustrated in
Figure 6-10.
2-9/32"
2-7/32"
1-7/8"
1-1/8"
1-5/16"
1-1/8"
1/2" RAD
5-5/8 RAD
90°
45°
30°
1-1/2" 12 NOTCHES
1/8" APART
4-3/4" RAD
78°
50°
NOTCH WIRE AS SHOWN
1/32 WIDE. (4) PLACES
1"
3/16"
1/16"
30°
REAR OIL HOLE - TECUMSEH
OIL DIP STICK
3-1/4"
3-1/4"
30°
YORK SIDE HOLE
SIDE OIL HOLE – TECUMSEH
FINGER RING
COMPRESSOR POSITION
FOR SIDE HOLE OIL CHECK
Figure 6-10
Refrigeration oil dipsticks
for checking compressor oil
levels are described in these
illustrations.