5.41
Engine and Cooling Systems
5
COOLING SYSTEMS
Thermostat Replacement
1. Remove the housing cover, by removing the cover bolts.
2. Check the gasket condition and replace if damaged.
3. Replace the thermostat. Make sure that the spring side is
facing downward or toward the engine.
4. Replace cover. Torque the cover fasteners to specification.
5. Verify the bleed screw and washer are installed.
Thermostat Orientation
The thermostat must be installed in the cylinder head has
shown in the illustrations.
Center Thermostat Location
Offset Thermostat Location
800 CFI Thermostats
There are two different thermostats used depending on
the engine model number.
The larger bleed hole thermostat is designed for cooling
systems that do not feature a bypass circuit in the cooling
system.
CAUTION
Allow engine to cool completely before working with the
engine cooling system.
Engine coolant can be under pressure and hot. Escap-
ing steam and/or coolant may cause severe burns to ex-
posed skin.
= T
Cover Fasteners: 9 Ft.Lbs. (12 Nm)
BLEED SCREW
WASHER
HOUSING COVER
THERMOSTAT
GASKET
Engine Model Thermostat PN Bleed Hole ID
S3489-8044-PU8E 7052433 2 mm
S3471-8044-PU8E 7052452 3.5 mm
BRIDGE ALIGNED WITH HOLES
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