TSE DPT40-B, Owner'S Manual

Page: 156 / 472

Lubrication & Maintenance — 6000 Hours/72 Months
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Testing Thermostat Opening Temperature
1. Visually inspect thermostat for corrosion or damage.
CAUTION: DO NOT allow thermostat or
thermometer to rest against the side or bottom
of container when heating water. Either may
become damaged if overheated.
2. Suspend thermostat and a thermometer in a container
of water.
3. Stir the water as it heats. Observe opening action of
thermostat and compare with specifications.
Specification
Thermostat — Start to
Open—Temperature............................................................ 83°C (181°F)
Thermostat — Fully
Open—Temperature............................................................ 95°C (203°F)
NOTE: Due to varying tolerances of different suppliers,
initial opening and full open temperatures may
vary slightly from specified temperatures.
4. Remove thermostat and observe its closing action as
it cools. In ambient air the thermostat should close
completely. Closing action should be smooth and slow.
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Testing Thermostat Opening Temperature
5. Replace thermostat if defective.
Installing Thermostat
1. If necessary, install seal (F) into the thermostat
housing.
2. Remove gasket material from cylinder head (K) and
thermostat housing (H) surfaces.
3. Place thermostat (I) into recess in thermostat housing
with jiggle pin on top for proper deaeration.
4. Apply Loctite ® fast drying black weather strip
adhesive to the thermostat housing side of gasket (J).
5. Place gasket (J) onto thermostat housing (H). Allow
adhesive to set.
NOTE: Gasket holds thermostat in place during installation
of thermostat housing onto the cylinder head.
6. Install cap screws (G) and tighten to specifications.
Specification
Thermostat Housing Cap
Screws —Torque.......................................................... 70 N·m (52 lb.-ft.)
7. Reinstall coolant pump bypass tube.
8. Fill cooling system and check for leaks.
IMPORTANT: Air must be expelled from cooling
system when system is refilled. Loosen
temperature sending unit fitting at rear of
cylinder head to allow air to escape when
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F— Bypass Tube Seal
G—M10 x 25 mm Cap Screw (2
used)
H—Thermostat Housing
I— Thermostat
J— Gasket
K—Cylinder Head
filling system. Retighten fitting when all
the air has been expelled.
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