Allis-Chalmers 3500 MK II / SOOMKII 1.5 — Testing Thermostats
Testing & diagnosis
For the Allis-Chalmers 3500 MK II / SOOMKII 1.5, from the Allis-Chalmers owner's manual.
Applies to: Allis-Chalmers 3500 MKII engine
Before you start
- Check water temperature with a reliable thermometer. Do not overheat.
Procedure
- Suspend thermostat in a container of clean water, fully immersed but not touching sides or bottom.
- Heat water gradually and stir so heat is evenly distributed.
- Observe thermostat as water temperature increases.
- Thermostat should begin to open between 175 to 182 F and be fully open at 202 F.
- Travel between open and closed positions must be a minimum of 0.266 in.
- If it does not operate within limits it must be replaced.
Tools required
- Reliable thermometer Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Begins to open 175 to 182 F (353 to 356 K)
- Fully open 202 F (368 K)
- Minimum travel 0.266 in (6.75 mm)
Full service-parts list: Allis-Chalmers 3500 MKII engine →
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.