Allis-Chalmers — Removing and Replacing Thermostat
Maintenance
From a Allis-Chalmers owner's manual covering: Series 606, Series 633, Series 649, Series 685. Check it applies to your exact model before use.
Procedure
- Drain cooling system.
- Remove coolant bypass tube or hose if applicable.
- Remove cap screws and lockwashers securing water outlet flange to thermostat housing.
- Raise flange with hose intact; remove gasket with thermostat.
- Clean, inspect and test thermostat; replace if faulty.
- Install thermostat(s) in clean housing with arrow pointing up (Series 433, 649, 670), set in counterbores.
- Position new gasket, place outlet flange on housing, secure with lockwashers and cap screws.
Specs & values
- Thermostat begins to open 180°F (82°C); fully open 200°F (93°C)
Source: Allis-Chalmers 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.