ISM, ISMe, and QSM11 – 008-016   Coolant Thermostat Seal

WARNING  Do not remove the pressure cap from a hot engine. Wait until the coolant temperature is below 50°C [120°F] before removing the pressure cap. Heated coolant spray or steam can cause personal injury.

WARNING  Coolant is toxic. Keep away from children and pets. If not reused, dispose of in accordance with local environmental regulations.

• Remove the thermostat. Refer to Procedure 008-013 in Section 8.

CAUTION  Use care when removing the thermostat seal, the thermostat housing can be damaged.

Use a punch and hammer to remove the seal from the housing.

WARNING  When using solvents, acids, or alkaline materials for cleaning, follow the manufacturer’s recommendations for use. Wear goggles and protective clothing to reduce the possibility of personal injury.

WARNING  Wear appropriate eye and face protection when using compressed air. Flying debris and dirt can cause personal injury.

Use solvent to clean the thermostat housing.

Dry with compressed air.

Inspect the thermostat housing for cracks, pits, or other damage.

When installing a new seal, the flat side of the seal must be facing the mandrel.

Use thermostat seal mandrel, Part Number ST-1225, and a hammer to install the seal.

WARNING  Coolant is toxic. Keep away from children and pets. If not reused, dispose of in accordance with local environmental regulations.

• Install the thermostat. Refer to Procedure 008-013 in Section 8.
• Operate the engine and check for leaks.