1991 Case 1825 Bolt Sizes & Torque Specs

Free OEM-referenced torque and bolt specs for the 1991 Case 1825.

This page is the OEM-referenced fastener summary for the 1991 Case 1825. 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 1991 Case 1825, fasteners follow SAE inch standards typical of 1990s-era Case engineering. Always confirm spec against the factory service manual before tightening safety-critical fasteners (suspension, brake, steering, head bolts).

Common fastener categories on the 1991 Case 1825

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 1991 Case 1825 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 1991 Case 1825?

Manufacturer-specified torque values for the 1991 Case 1825 are in the factory service manual or owner's handbook. WhatSizeBolt sources values from manufacturer literature and verifies against community data — if we do not have this exact year listed, check the Case brand page for the closest model year.

What socket size do I need for the 1991 Case 1825 lug nuts?

Most modern Case vehicles use a 19mm or 21mm socket. Older Case models from before 2000 may use a 13/16" SAE socket on certain trims. Confirm against the actual lug before purchasing aftermarket wheels.

Are the 1991 Case 1825 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 Case 1825 years

Same model, different model year — fastener spec may change. Always confirm against the year for your VIN.

→ 1991 Case 1825 oil drain plug torque & size

All 29 1991 Case 1825 fastener specs

Per-bolt torque, wrench size, and thread spec for the 1991 Case 1825, sourced from OEM service literature and verified against community shop data. Values pair imperial (ft-lb) and metric (Nm) where the manufacturer publishes both.

Engine — 1991 Case 1825

Engine bolt-by-bolt torque for the 1991 Case 1825, including the long block, valve covers, and intake. Injection pump bolt tightens to 65 ft-lbs, takes a 17mm driver, runs on M12x1.75 threads, located at the engine block. The oil drain plug uses a 17mm drive on a M14x1.5 thread, torqued to 45 ft-lbs at the oil pan. At the valve cover, the valve cover bolt torques to 8 ft-lbs (10mm drive, M6x1.0 thread). For the crankshaft, plan for a 19mm tool on a M14x1.5 stud; final torque is 85 ft-lbs (fan pulley bolt).

Body — 1991 Case 1825

Body fasteners on the 1991 Case 1825. The door hinge bolt uses a 13mm drive on a M8x1.25 thread, torqued to 25 ft-lbs at the cab frame. At the frame, the rops bolt torques to 185 ft-lbs (24mm drive, M16x2.0 thread). For the floor, plan for a 17mm tool on a M12x1.75 stud; final torque is 65 ft-lbs (seat base bolt). Belly pan bolt tightens to 25 ft-lbs, takes a 13mm driver, runs on M8x1.25 threads, located at the frame.

Electrical — 1991 Case 1825

Electrical fasteners on the 1991 Case 1825. At the alternator, the alternator b+ terminal nut torques to 15 ft-lbs (13mm drive, M8x1.25 thread). For the block/transmission, plan for a 12mm tool on a M8x1.25 stud; final torque is 22 ft-lbs (starter support bracket bolt). Starter heat shield bolt tightens to 8 ft-lbs, takes a 10mm driver, runs on M6x1.0 threads, located at the starter body. The idler pulley bolt uses a 15mm drive on a M10x1.5 thread, torqued to 35 ft-lbs at the bracket. At the starter, the starter b+ terminal nut torques to 15 ft-lbs (13mm drive, M8x1.25 thread). For the block, plan for a 15mm tool on a M10x1.5 stud; final torque is 35 ft-lbs (belt tensioner pivot bolt). Alternator terminal nut tightens to 70 in-lbs (7.9 Nm), takes a 10mm driver, runs on M6x1.0 threads, located at the alternator. The belt tensioner lock bolt uses a 12mm drive on a M8x1.25 thread, torqued to 22 ft-lbs at the tensioner body. At the block, the alternator ground strap bolt torques to 8 ft-lbs (10mm drive, M6x1.0 thread). For the solenoid, plan for a 10mm tool on a M6x1.0 stud; final torque is 70 in-lbs (starter solenoid terminal nut). Starter ground strap bolt tightens to 8 ft-lbs, takes a 10mm driver, runs on M6x1.0 threads, located at the block.

Hydraulic — 1991 Case 1825

Hydraulic fasteners on the 1991 Case 1825. For the valve block, plan for a 13mm tool on a M8x1.25 stud; final torque is 25 ft-lbs (control valve bolt). Hydraulic pump bolt tightens to 35 ft-lbs, takes a 13mm driver, runs on M8x1.25 threads, located at the pump mount. The hydraulic line fitting uses a 22mm drive on a M16x1.5 thread, torqued to 45 ft-lbs at the various. At the motor mount, the hydraulic motor bolt torques to 85 ft-lbs (17mm drive, M12x1.75 thread).

Loader — 1991 Case 1825

Loader fasteners on the 1991 Case 1825. Quick attach pin tightens to N/A — Press Fit, takes a 24mm driver, runs on Press Fit threads, located at the attachment plate. The loader arm pivot pin uses a 32mm drive on a Press Fit thread, torqued to N/A — Press Fit at the frame. At the loader arms, the bucket pivot pin torques to N/A — Press Fit (27mm drive, Press Fit thread). For the cylinder end, plan for a 19mm tool on a M14x2.0 stud; final torque is 110 ft-lbs (cylinder pin lock).

Drive — 1991 Case 1825

Drive fasteners on the 1991 Case 1825. The chain case cover bolt uses a 13mm drive on a M8x1.25 thread, torqued to 25 ft-lbs at the chain case. At the chain case, the drive motor bolt torques to 110 ft-lbs (19mm drive, M14x2.0 thread).

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 1991 Case 1825 numbers above.

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