The Kubota B1121 coolant capacity is listed as 1.65 gal (6.2 L). It also lists coolant type ethylene glycol-based coolant and ASTM D3306 compatible and antifreeze mix 50/50 coolant and water mix.
Kubota B1121 Coolant Capacity
| Coolant capacity | 1.65 gal (6.2 L) |
|---|---|
| Cooling system capacity | 1.65 gal (6.2 L) |
| Radiator capacity | 1.64 gal (6.2 L) |
| Coolant type | ethylene glycol-based coolant and ASTM D3306 compatible |
| Antifreeze mix | 50/50 coolant and water mix |
| Engine model | D1105 |
| Engine horsepower | 10.7 hp (8 kW) |
| Engine displacement | 0.5 L (30.5 cu in) |
Coolant Capacity Comparison Chart
Coolant capacity comparison
Engine horsepower comparison
Engine displacement comparison
Kubota B1121 Coolant and Engine Notes
| Coolant capacity note | The headline cooling-system number for the Kubota B1121 is 1.65 gal (6.2 L). Buy enough coolant before opening the drain plug |
|---|---|
| Radiator capacity note | For the Kubota B1121, the captured radiator capacity is 1.64 gal (6.2 L). If you are doing a full drain, check the full cooling-system capacity too |
| Coolant type note | Coolant type for the Kubota B1121 is listed as ethylene glycol-based coolant and ASTM D3306 compatible. The safest move is to use coolant that matches the manual’s spec rather than mixing random formulas |
| Antifreeze mix note | For the Kubota B1121, the captured mix is 50/50 coolant and water mix. Straight water is not the right long-term answer unless you are only flushing the system |
| Engine context note | Engine context for the Kubota B1121: engine model D1105, engine horsepower 10.7 hp (8 kW), and displacement 0.5 L (30.5 cu in). Engine size helps explain why coolant capacity changes between models |
| Refill note | When refilling the Kubota B1121, use 1.65 gal (6.2 L) as the planning number and 50/50 coolant and water mix as the mixture guide. Recheck the level after the thermostat opens |
Kubota B1121 Coolant Capacity FAQ
How much coolant does the Kubota B1121 take?
The main coolant amount captured for the Kubota B1121 is 1.65 gal (6.2 L). Buy a little extra so you can top up after the engine warms up and cools down.
Does coolant type matter on the Kubota B1121?
Yes. Capacity tells you how much to buy; coolant type tells you what to buy. For the Kubota B1121, the captured coolant type is ethylene glycol-based coolant and ASTM D3306 compatible.
What antifreeze mix does the Kubota B1121 use?
The captured antifreeze mix for the Kubota B1121 is 50/50 coolant and water mix. A 50/50-style mix is the common practical answer unless your manual or climate calls for something different.
When should the Kubota B1121 coolant be replaced?
Use the service interval in the operator manual as the service guide. Coolant can look okay but still lose corrosion protection over time.
What engine specs affect Kubota B1121 coolant capacity?
The captured engine context is engine model D1105, horsepower 10.7 hp (8 kW), and displacement 0.5 L (30.5 cu in). Engine size is one reason coolant capacity changes between tractors.
Mistakes do happen. Tractor coolant specs can change by year, market, engine, radiator, cab/heater setup and service procedure. Please check the operator manual, decal information and official kubotausa.com website for official information before draining or refilling the cooling system.
