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For these Allis Chalmers models: 433T & 433I, 6138, 6138LT-6138T, 649, 649T & 649I, 670, 67381, 685, 685I, 685T, Series 433, Series 606.
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Procedure
- 1. Safety Thermostat 5. Bottom casting 9. Top Casting
- 2. To temperature control thermastat 6. Lead washer _ 10. Silicone rubbing seal
- 3. Coolant outlet 7. Element ll. Terminal cover
Source: manual:Allis_Chalmers_Series_433-649-670-685-6138_Manual-1.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.