There’s nothing more frustrating than a coolant leak that shows up right when you need your tractor most. This small but critical O-ring seals the connection between your thermostat housing and water pump, preventing coolant from weeping out and air from getting in. When you start seeing dried coolant residue around the thermostat area or notice your coolant levels dropping slowly, this is often the simple fix that solves the problem.
What You’re Getting
- Precise fit that creates a proper seal between thermostat and water pump housing
- Heat and coolant-resistant compound that handles the temperature cycles these engines see
- Direct replacement – same dimensions as the original seal that came on your tractor
- Inexpensive insurance against costly coolant leaks and overheating damage
Built for Real Farm Work
This O-ring fits a wide range of Valmet and Valtra tractors from the smaller 255 and 355 models up through the bigger 6000 and 8000 series machines. Whether you’re running a compact utility tractor for chores around the farm or operating a larger row-crop tractor for planting and harvest, proper cooling system sealing is essential for reliable operation.
Made to Last
Cooling system seals take a beating from constant temperature changes, coolant additives, and system pressure. This O-ring is built with materials that resist swelling, cracking, and hardening even after years of heat cycles. It maintains flexibility and sealing ability through hot summer fieldwork and cold winter storage.
Good to Know
This seal is typically replaced when you’re doing thermostat service or water pump work. Clean the sealing surfaces thoroughly and check for any nicks or scratches that could cause the new O-ring to leak. A light coating of coolant on the O-ring during installation helps prevent it from rolling or tearing. While you’ve got the cooling system apart, it’s smart to replace any other seals that look marginal – they’ve all been through the same heat cycles.
