Triumph TR series

Coolant capacity & service interval

The Triumph TR series uses coolant with capacities ranging from 6.2 to 10.9 liters depending on the configuration. The data covers 10 different configurations.

The configuration chart below lists fill volumes and service intervals for each engine and trim variant.

TypeSpecifications
TR7 (1980-1982)
  • Use: Normal
  • Capacity 7,9 liter
TR8, EFI (1980-1981)
  • Use: Normal
  • Capacity 9,9 liter (Expansion tank system)
  • Capacity 10,9 liter (Header tank system)
TR8 (1978-1980)
  • Use: Normal
  • Capacity 9,9 liter (Expansion tank system)
  • Capacity 10,9 liter (Header tank system)
TR7 (1974-1979)
  • Use: Normal
  • Capacity 7,9 liter
TR6 PI (1969-1976)
  • Use: Normal
  • Capacity 6,2 liter
TR5 PI (1967-1968)
  • Use: Normal
  • Capacity 6,2 liter
TR4A (1965-1967)
  • Use: Normal
  • Capacity 6,2 liter
TR4 (1961-1965)
  • Use: Normal
  • Capacity 8 liter
TR3A (1957-1961)
  • Use: Normal
  • Capacity 8,3 liter
TR3 (1955-1957)
  • Use: Normal
  • Capacity 8,3 liter

Additional Notes

  • The Triumph TR3 and TR3A share a cooling system capacity of 8.3 liter across the 1955-1961 span, indicating no change in radiator or block design between the two model updates.
  • Cooling system capacity drops to 8 liter for the TR4 (1961-1965), a reduction from the earlier 8.3 liter figure, corresponding with revisions made to the engine and radiator layout for this model.
  • A further decrease appears with the TR4A (1965-1967), where cooling system capacity falls to 6.2 liter, nearly two liters below the preceding TR4 specification.
  • The 6.2 liter cooling system capacity established for the TR4A carries forward unchanged through the TR5 PI (1967-1968) and TR6 PI (1969-1976), spanning roughly a decade of production without alteration to this figure.
  • Cooling system capacity rises again with the TR7, listed at 7.9 liter for both the 1974-1979 and 1980-1982 production periods, showing consistency across the full production span into 1982.
  • The TR8 (1978-1980) lists two distinct cooling system capacities depending on configuration: 9.9 liter for vehicles fitted with an expansion tank system and 10.9 liter for those using a header tank system, a one liter difference tied directly to the reservoir design.
  • The TR8 EFI variant (1980-1981) retains the same dual capacity figures as the standard TR8, with 9.9 liter for the expansion tank system and 10.9 liter for the header tank system, indicating no change in cooling system volume despite the fuel injection modification.
  • Every capacity figure across the full TR series range is classified under normal use, meaning the listed values reflect routine service fill volumes rather than specialized or heavy duty operating conditions.

Other Systems