WhichTractor
  • Rigid chassis
  • WhichTractor size: Standard-size
  • No lab test on file
  • 1976–1980
  • 6,150 built

WhichTractor size, not the maker’s category

International Harvester 686 Engine specs

9 engine values on record for the 686.

Engine power, claimed · gross or net not stated

66.1 hp

49.3 kW as stated by the source

No lab test on file

Claimed · standard not stated by the source

Source · Traktorenlexikon, “IHC 686”, claimed

This is the maker’s own figure, measured at the engine. Power at the PTO is lower — by how much, for this machine, nobody has measured.

What engine is in a 686?

A 686 has a INTERNATIONAL HARVESTER C-291, a 6-cylinder engine.

Engine — INTERNATIONAL HARVESTER C-291 specifications
Make & modelINTERNATIONAL HARVESTER C-291Source 1
Cylinders6Source 1
CoolingLiquid-cooled
Fuel injectionBosch injection pump
Maximum torque220 lb·ft · 298 N·m
Maximum torque speed1,600 rpm
Air cleanerdry air filter
Cylinders6
Displacement5.0–5.4 qt · 4.8–5.1 Lthe article lists alternatives
Rated engine speed2,000 rpm

Source · Traktorenlexikon, “IHC 686”

Sources and how this page was built

9 engine values from Traktorenlexikon, “Farmall Farmall 756”; and Traktorenlexikon, “IHC 686”.

Sources checked

14 SEP 2026

Spotted an error?

Sources

Facts taken from these documents, units converted. Numbers beside a figure refer to this list. Licences and attribution

  1. Traktorenlexikon: Farmall Farmall 756 — CC BY-SA 4.0, WIKIBOOKS-TL-118751 · revision 1054991. Wikibooks contributors (Traktorenlexikon). Original document
  2. Traktorenlexikon: IHC 686 — CC BY-SA 4.0, WIKIBOOKS-TL-118937 · revision 1035394. Wikibooks contributors (Traktorenlexikon). Original document