1971 International Harvester Scout Ii Lug Nut Torque & Bolt Specs
The 1971 International Harvester Scout Ii lug nut torque is 90-110 ft-lbs, tightened with a 3/4" socket. Torque in a star pattern in two passes (snug, then final), and re-check after the first 50–100 miles of driving. Use a calibrated torque wrench — not an impact gun — for the final pass.
Lug nut torque: 90-110 ft-lbs · Socket size: 3/4".
This page is the OEM-referenced fastener summary for the 1971 International Harvester Scout Ii. Use it before any maintenance or repair job where torque values matter — brake work, wheel changes, suspension service, engine teardowns, or oil changes. Specs are pulled from manufacturer service literature, cross-checked against community data, and updated as new chassis variants become available.
For the 1971 International Harvester Scout Ii, fasteners follow SAE inch standards typical of classic International Harvester engineering. Always confirm spec against the factory service manual before tightening safety-critical fasteners (suspension, brake, steering, head bolts).
Common fastener categories on the 1971 International Harvester Scout Ii
- Wheel / lug nut torque and thread spec (covered above)
- Brake caliper bracket bolts (typically 80-130 ft-lbs) and slide/guide pins (18-35 ft-lbs)
- Engine oil drain plug torque — rarely above 30 ft-lbs; always use a new crush washer
- Transmission pan, valve cover, and intake manifold bolts (low torque, often 89-106 in-lbs)
- Suspension control arm, sway bar, tie rod end and ball joint torque
- Spark plug torque (typically 10-15 ft-lbs on aluminum heads — do not exceed)
- Differential cover bolts (RWD/4WD only) and transfer case fasteners
Repair guidance for this model year
Heads up for 1971 International Harvester Scout Ii owners: Vehicles this age frequently have seized fasteners due to thread corrosion. Apply penetrating oil (PB Blaster, Kroil) 24 hours before any wrenching, and have a thread chaser on hand. Lug studs are particularly prone to thread damage at this age; if a nut spins on without engaging, the stud is stretched and must be replaced before the wheel goes back on.
Tools you will need
- SAE socket set (1/4"-7/8"), 6-point impact-rated
- Calibrated torque wrench (10-150 ft-lbs covers most automotive jobs; add a 0-250 ft-lbs wrench for truck lug nuts)
- Breaker bar (24" minimum) for initial loosening
- Penetrating oil (PB Blaster or Kroil) for any fastener over 5 years old
- Anti-seize on stainless or dissimilar-metal threads; thread-locker (Loctite blue) on critical reassembly
Frequently asked questions
What is the lug nut torque on a 1971 International Harvester Scout Ii?
The OEM-specified lug-nut torque for the 1971 International Harvester Scout Ii is 90-110 ft-lbs, using a 3/4" socket. Use a calibrated torque wrench in a star pattern, in two passes (50% and 100%), and re-check after 50-100 miles of driving.
What socket size do I need for the 1971 International Harvester Scout Ii lug nuts?
The 1971 International Harvester Scout Ii uses a 3/4" socket. A 6-point impact-rated socket is recommended over a 12-point chrome socket — 12-points round off lug nuts under impact-driver use.
Are the 1971 International Harvester Scout Ii fasteners metric or SAE?
SAE inch is the standard for this vehicle. Most fasteners on this vehicle are SAE inch, common sizes 1/4", 5/16", 3/8", 7/16", 1/2". Bolt-head markings are the fastest way to confirm grade and material at the bench.
Other International Harvester Scout Ii years
Same model, different model year — fastener spec may change. Always confirm against the year for your VIN.
- 1980 International Harvester Scout Ii lug nut torque
- 1979 International Harvester Scout Ii lug nut torque
- 1978 International Harvester Scout Ii lug nut torque
- 1977 International Harvester Scout Ii lug nut torque
- 1976 International Harvester Scout Ii lug nut torque
- 1975 International Harvester Scout Ii lug nut torque
- 1974 International Harvester Scout Ii lug nut torque
- 1973 International Harvester Scout Ii lug nut torque
- 1972 International Harvester Scout Ii lug nut torque
→ 1971 International Harvester Scout Ii oil drain plug torque & size
All 25 1971 International Harvester Scout Ii fastener specs
Per-bolt torque, wrench size, and thread spec for the 1971 International Harvester Scout Ii, sourced from OEM service literature and verified against community shop data. Values pair imperial (ft-lb) and metric (Nm) where the manufacturer publishes both. 3 of the 25 fastener specs on this page are independently verified against OEM service manuals and manufacturer torque data (last reviewed June 2026).
Engine — 1971 International Harvester Scout Ii
Engine bolt-by-bolt torque for the 1971 International Harvester Scout Ii, including the long block, valve covers, and intake. At the engine, the engine mount bolt torques to 40-50 ft-lbs (9/16" drive). For the engine, plan for a 5/8" tool; final torque is 25-30 ft-lbs (oil drain plug). Confirmed against manufacturer service literature. Oil pan bolt tightens to 12-15 ft-lbs, takes a 1/2" driver, located at the engine. The intake manifold bolt uses a 1/2" drive, torqued to 25-30 ft-lbs at the engine. At the engine, the spark plug (v8) torques to 15-20 ft-lbs (13/16" or 5/8" drive). For the engine, plan for a 7/16" tool; final torque is 5-7 ft-lbs (valve cover bolt). Spark plug tightens to 15-20 ft-lbs, takes a 13/16" or 5/8" driver, located at the engine.
Suspension — 1971 International Harvester Scout Ii
Suspension and chassis fastener torque for the 1971 International Harvester Scout Ii — strut, control arm, and sway bar values. For the suspension, plan for a 9/16" tool; final torque is 45-55 ft-lbs (leaf spring u-bolt). Tie rod end nut tightens to 35-45 ft-lbs, takes a 11/16" driver, located at the suspension. The leaf spring shackle bolt uses a 9/16" drive, torqued to 35-45 ft-lbs at the suspension. At the suspension, the shock absorber bolt torques to 25-35 ft-lbs (1/2" drive). For the suspension, plan for a 9/16" tool; final torque is 50-60 ft-lbs (steering box bolt). Drag link end nut tightens to 35-45 ft-lbs, takes a 3/4" driver, located at the suspension.
Brake — 1971 International Harvester Scout Ii
Brake fasteners on the 1971 International Harvester Scout Ii. Brake line fitting tightens to 10-12 ft-lbs, takes a 3/8" or 10mm driver, located at the brake. The backing plate bolt uses a 1/2" drive, torqued to 25-35 ft-lbs at the brake. At the brake, the brake drum retaining screw torques to 10-15 ft-lbs (Phillips drive). For the brake, plan for a 1/2" tool; final torque is 35-45 ft-lbs (brake caliper bolt). Wheel cylinder bolt tightens to 10-12 ft-lbs, takes a 3/8" driver, located at the brake.
Transmission — 1971 International Harvester Scout Ii
Transmission fasteners on the 1971 International Harvester Scout Ii. The transfer case drain plug uses a 5/8" drive, torqued to 25-30 ft-lbs at the transmission. At the transmission, the transmission mount bolt torques to 40-50 ft-lbs (9/16" drive). For the transmission, plan for a 5/8" tool; final torque is 25-30 ft-lbs (transfer case fill plug). Transmission pan bolt tightens to 10-12 ft-lbs, takes a 7/16" driver, located at the transmission.
Wheel — 1971 International Harvester Scout Ii
Wheel fasteners on the 1971 International Harvester Scout Ii. At the wheel, the wheel stud torques to 90-110 ft-lbs (N/A drive). Confirmed against manufacturer service literature. For the wheel, plan for a 3/4" tool; final torque is 90-110 ft-lbs (lug nut). This figure is independently verified against OEM service data. Hub cap clip takes a N/A driver, located at the wheel.
New to torquing wheels? Read our How lug nut torque works — the complete guide for star-pattern sequence, re-torque intervals, and how to read a lug spec — then use the 1971 International Harvester Scout Ii numbers above.
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