International — Thermostat removal and check

Maintenance

From a International owner's manual covering: C-152, C-196, C-304, C-345, C-392, C-446, C-537, C-605. Check it applies to your exact model before use.

Applies to: International C 549 engine

Procedure

1. Drain cooling system to a level below the thermostat housing.
2. Loosen hose clamp securing radiator inlet hose to thermostat housing and remove hose.
3. Remove retaining ring securing thermostat in thermostat housing.
4. Remove thermostat from housing.
5. Clean thermostat; replace if coated with scale.
6. Suspend thermostat and a thermometer in a container of water (do not let either contact container sides or bottom).
7. Heat water and note temperature when thermostat starts to open (approx. +180 F) and when fully open (approx. +200 F).
8. If thermostat does not function as described, replace it.
9. Install thermostat (spring end down) into housing and secure with retaining ring.
10. Install and secure radiator inlet hose with hose clamp.
11. Fill cooling system; operate engine; observe gauge and check for leaks; correct all leaks.

Source: International owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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