Generac — Thermostat Seat with Thermostat Assembly Removal and Installation
Repair & overhaul · Cooling system
From a Generac service manual covering: CAC478, CAC480, SQR480. Check it applies to your exact model before use.
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Procedure
- Loosen three M6×40 bolts and remove them.
- Remove the thermostat seat with thermostat assembly.
- Pry out the spring clip with a chisel or screwdriver.
- Take out the thermostat and sealing gasket.
- Assembly: put the rubber seal ring into the thermostat hole.
- Install the thermostat with spring outward.
- Install the spring clip, ensuring it is clipped into the thermostat seat groove.
- Install the new thermostat seat sealing gasket with a bolt.
- Install the thermostat assembly into the rear end hole of the cylinder head and tighten 3 bolts to 88 in-lbs.
- Tighten the hex head plug with sealing gasket to 38-42Nm.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Thermostat seat bolts: 88 in-lbs
- Hex head plug: 38-42Nm
- Intake preheating switch (if equipped): 30 ft-lbs
Source: Generac service 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.