Thermostat - Jacobsen R-311T Technical/Repair Manual

ENGINE
9
17
11
13 14 15
3
8. Loosen two clamps (9) and remove upper radiator
hose (10).
9. Loosen two clamps (11) and remove lower radiator
hose (12).
10. While supporting the radiator, remove four flat
washers (13), lock washers (14), and nuts (15).
11. Move fan shroud (16) back over fan and carefully
remove the radiator (17).
Radiator Installation
1. Install the radiator by reversing the order of removal.
2. With the lower radiator hose removed from radiator,
flush the inside of the radiator with fresh water.
Always use a mixture of antifreeze and fresh
water in the engine cooling system. Normally a
50/50 coolant mixture will provide freeze
protection to -37°F (-38°C) and boil-over
protection in an efficient cooling system.
3. Fill the radiator with a 50/50 mixture of good quality
ethylene glycol-base antifreeze and clean fresh
water.
4. Install the radiator cap and start the engine following
the instructions in the "Safety & Operation Manual."
Allow the engine coolant to completely cool
before removing the radiator cap. Hot coolant
sprayed from the cap can cause serious personal
injury.
3-12
16
10
11
12
Figure 3-16
!
CAUTION
!
CAUTION
5. When the engine reaches normal operating
temperature, check and fill the coolant reservoir to
the hot full level.

Thermostat

9
Removal and Installation
See Figure 3-17.
1. Park the mower safely. (See "Park Mower Safely" on
page 1-6.)
2. Allow the engine to cool completely.
3. Raise the hood.
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Never remove the radiator cap when the coolant
is hot. The engine must be shut down and cooled
before the radiator cap is removed. Very hot
coolant will be sprayed from the radiator if the
cap is loosened before the engine has cooled.
Serious personal injury can occur.
4. Drain the cooling system, 8 qt (7.6 L).
1
4
3
5. Loosen hose clamp (2) and remove hose (1).
6. Remove two screws (4).
7. Remove thermostat housing (3), gasket, and
thermostat.
Installation Notes
• Install the thermostat by reversing the order of
removal.
• Clean gasket surface.
• Use a new gasket during installation.
• Fill the radiator with a 50/50 mixture of good quality
ethylene glycol-base antifreeze and clean fresh
water.
!
WARNING
2
Figure 3-17
4234520 First Edition
TN9975