International Harvester 33

Coolant capacity & service interval

International Harvester 33 uses coolant with a capacity range of 13,6 to 17,5 liters. Service intervals consist of checking every 50 hours and changing every 1200 hours. The data covers 5 configurations.

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

TypeSpecifications
733 (1983-1985)
  • Use: Normal
  • Capacity 17,5 liter
  • Check 50 hours
  • Change 1200 hours
433 (1976-1985)
  • Use: Normal
  • Capacity 13,6 liter
  • Check 50 hours
533 (1976-1985)
  • Use: Normal
  • Capacity 14,1 liter
  • Check 50 hours
  • Change 1200 hours
633 (1976-1985)
  • Use: Normal
  • Capacity 14,6 liter
  • Check 50 hours
  • Change 1200 hours
733 (1976-1983)
  • Use: Normal
  • Capacity 17,5 liter
  • Check 50 hours
  • Change 1200 hours

Additional Notes

  • The International Harvester 33 series cooling system capacities range from 13.6 liters on the 433 up to 17.5 liters on the 733, reflecting the progressively larger engine displacements across the lineup.
  • The 433 (1976-1985) carries a cooling system capacity of 13.6 liters, and its specifications include only a check interval with no change interval recorded.
  • The 533 and 633 share the same 50-hour check interval and 1200-hour change interval under normal use conditions, with their capacities differing by 0.5 liters at 14.1 and 14.6 liters respectively.
  • The 633 (1976-1985) holds 14.6 liters of coolant, placing it between the 533 and the larger 733 in terms of system volume.
  • The 733 maintains a consistent cooling system capacity of 17.5 liters across both its 1976-1983 and 1983-1985 specification entries, with identical check and change intervals of 50 hours and 1200 hours under normal use conditions.
  • A 50-hour check interval appears across all five specification rows, indicating a uniform inspection frequency for the cooling system regardless of engine variant or model year range.
  • The 1200-hour coolant change interval, present on the 533, 633, and both 733 entries, applies specifically under normal use conditions as defined in those rows.

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