How to Use Spare Tire Jack: Instructions, Tips, and Useful Advice
A flat tire is stressful, but the jack itself is usually not complicated. The dangerous part is using it in the wrong location, on unstable ground, or for longer than it was designed to support. A few careful checks can make the difference between a controlled roadside tire change and a preventable injury or vehicle-damage situation.
I will explain how to use spare tire jack equipment safely, including where to place it, how high to lift the vehicle, how to install the spare, and what to do afterward. The instructions apply mainly to the factory jack supplied with a passenger vehicle, while also pointing out situations where a different jack or roadside professional is the better choice.
Always treat the vehicle owner’s manual as the final authority. Jack shapes, lift points, spare-tire systems, and lug-nut procedures vary significantly between cars, trucks, and SUVs.
What a Spare Tire Jack Does
A spare tire jack is a compact lifting device designed to raise one corner of a vehicle high enough to remove a flat wheel and install a spare Most factory kits include a scissor jack a crank.
The jack is not intended to hold the vehicle up while someone works underneath it. It is also not a substitute for a jack stand, and a factory emergency jack is generally not suitable for routine maintenance. Its purpose is short-duration lifting on a reasonably firm, level surface.
A spare tire kit may also contain wheel chocks, a spare-tire winch tool, a foam storage tray, or a locking lug-nut adapter. Find and identify these parts before an emergency if possible. Knowing where the kit is stored prevents unnecessary searching beside a busy road.
Check Safety Before Lifting
Before touching the jack, make the vehicle as stable and visible as possible. Pull completely off the travel lane onto a firm shoulder, parking lot, or other safe area. Turn on the hazard lights, apply the parking brake, and place the transmission in Park. For a manual transmission, select first gear or reverse, following the owner’s manual.
Turn off the engine unless the manual gives a specific reason not to. Ask passengers to exit on the side away from traffic and keep everyone well clear of the vehicle. At night or in poor weather, use a flashlight and reflective warning devices if they are available and can be placed safely.
Do not attempt a tire change on a narrow shoulder if passing traffic leaves no safe working space. A tow operator or roadside-assistance provider is the appropriate choice in that situation. The same applies if the vehicle is partially in traffic, visibility is poor, or the shoulder is too soft to support the jack.
Use a Stable Surface
The best surface is level, hard, and free of loose gravel, mud, ice, and standing water. A jack can shift or sink when placed on an unstable surface. Avoid lifting on a steep slope, soft grass, a crowned road, or an area where the vehicle could roll.
If moving the vehicle a short distance to a safer location is possible without damaging the wheel or tire, do so slowly. Do not drive on a completely flat tire for that purpose unless the manufacturer specifically permits it. A damaged tire can affect steering, braking, and wheel components.
Chock the Wheels
Place a wheel chock in front of and behind a tire that will remain on the ground, if chocks are available. A solid block of wood can work as an emergency substitute, but never use loose objects that may roll or break. Chocking is especially important if the vehicle is on anything other than perfectly level pavement.
Do not depend only on the parking brake or transmission. Those systems reduce movement but do not eliminate every risk while a wheel is lifted.
Find the Correct Jacking Point
Every vehicle has reinforced lifting points designed to accept the jack. They are commonly located behind the front wheels and ahead of the rear wheels, along the lower rocker-panel pinch weld. Some vehicles use a notch in the pinch weld; others use a round, rectangular, or boxed pad on the vehicle frame or subframe.
Use the owner’s manual to identify the correct point for the flat tire. Look for an embossed arrow, notch, reinforced seam, or marked pad. The jack saddle—the top support portion of the jack—must contact the designated area squarely.
Never place the jack under a plastic body panel, floor pan, exhaust component, suspension arm, differential, fuel tank, or random section of the frame unless the manufacturer specifically identifies that location. A point that appears strong may bend, crack, or allow the jack to slip.
Clear away packed snow, stones, and debris so the jack sits flat. If the vehicle has a decorative rocker-panel cover, make sure the jack is positioned in the opening or reinforced location specified by the manufacturer rather than against the trim.
Prepare the Wheel Before Lifting
Remove the hubcap or wheel cover if it blocks access to the lug nuts. Use the flat end of the factory lug wrench or the tool supplied for the cover. Work gently around the edge to avoid cracking plastic or scratching the wheel.
Loosen each lug nut slightly before raising the vehicle. Turn the wrench counterclockwise when viewed from the outside of the wheel. Apply steady pressure rather than jumping on the wrench. Breaking the initial friction while the tire is still on the ground keeps the wheel from spinning.
Do not remove the lug nuts completely at this stage. Loosen them by roughly a quarter to half turn, leaving enough engagement to hold the wheel firmly against the hub. If a lug nut will not move, confirm that the wrench fits fully and that a locking-lug adapter is not required. Excessive force can damage the nut, wrench, or wheel.
How to Raise the Vehicle With the Jack
- Position the jack. Set the jack directly beneath the approved lifting point. The base should lie flat, and the jack should stand as vertically as its design allows.
- Attach the handle. Insert the crank or lug-wrench handle according to the kit design. Check that the handle engages securely before applying force.
- Raise slowly. Turn the handle in the direction marked on the jack. Watch the saddle and lifting point as the jack begins to contact the vehicle.
- Pause for a stability check. Confirm that the base remains flat, the saddle has not slipped, and the vehicle is rising at the intended corner.
- Lift only as high as necessary. Raise the vehicle until the flat tire is just clear of the ground, usually with a small amount of additional space for the inflated spare.
Keep hands, feet, and your body out from underneath the vehicle. Do not place any part of yourself under the chassis while it is supported only by the factory jack. If the jack tilts, sinks, twists, or makes unusual noises, stop turning the handle and lower the vehicle if it can be done safely.
Do not climb into the vehicle, open heavy doors unnecessarily, or move cargo while it is lifted. A sudden change in weight distribution can affect stability. Never run the engine or ask someone to sit inside while the vehicle is on the jack.
How High Should the Jack Lift?
The tire should be high enough for the wheel to come off the hub and for the spare to slide into place. Too little clearance makes installation difficult; too much clearance increases the height and instability of the raised vehicle.
For many cars, a small gap between the flat tire and the ground is enough. A compact spare may have a different diameter from the normal tire, so check the space required before lifting farther. If the spare is stored under the vehicle, remove it before jacking whenever the storage design permits.
Remove the Flat Wheel
Finish removing the loosened lug nuts by hand or with the wrench. Keep them together in a safe location where dirt will not enter the threads. Pull the wheel straight toward you. If it sticks to the hub because of corrosion, do not strike the tire or wheel with excessive force while the vehicle is elevated.
Lightly rocking the wheel from side to side may break the bond, but keep your hands clear of pinch points. If the wheel remains stuck, lower the vehicle enough to restore firm contact and seek appropriate assistance. Do not crawl under the vehicle or use a heavy tool in a way that could knock it off the jack.
Place the removed wheel flat under the vehicle only if the owner’s manual recommends this practice. It may reduce the fall distance in some situations, but it does not make it safe to work underneath the vehicle. Otherwise, set the wheel well away from traffic and the work area.
Inspect the exposed hub, wheel studs, and brake components. Do not touch hot brake parts. Remove loose corrosion from the wheel’s mounting surface only if it can be done safely; never apply grease or anti-seize to lug studs unless the manufacturer specifically instructs it.
Install the Spare Tire
Align the spare wheel’s center hole with the hub or its openings with the wheel studs. Push it fully into position. If the vehicle uses lug bolts rather than studs and nuts, support the wheel carefully while starting the first bolt so the threads do not cross.
Install all lug nuts by hand. On a wheel with tapered lug nuts, the tapered end normally faces the wheel, but the exact design varies. Follow the manual because some wheels use flat-seat nuts, washers, or special shapes. If a nut does not turn smoothly by hand for several rotations, remove it and realign it rather than forcing it with the wrench.
Tighten the lug nuts in a crisscross or star pattern while the spare is still slightly above the ground. This centers the wheel more evenly on the hub. Snug each nut, but do not apply full final torque until the vehicle is lowered.
Lower the Vehicle and Tighten the Lug Nuts
Turn the jack handle slowly in the lowering direction. Lower the vehicle until the spare touches the ground firmly and cannot rotate, but keep the jack supporting some weight until the lug nuts receive their final tightening.
Use the crisscross pattern again to tighten the nuts. The correct final force is the vehicle manufacturer’s specified lug-nut torque, measured with a calibrated torque wrench. A factory lug wrench can provide a temporary roadside tightening, but it cannot confirm an exact torque value.
If a torque wrench is available and the manual lists the specification, tighten each nut in stages using the star pattern. Do not use an impact wrench for final tightening unless the tool and procedure are specifically approved for that purpose. Over-tightening can stretch studs, damage threads, distort brake components, and make later removal difficult. Under-tightening can allow the wheel to loosen.
Once the lug nuts are tight, lower the vehicle completely and remove the jack. Store the jack, handle, tools, and flat tire securely. Recheck the lug nuts after the vehicle is fully on the ground, then reinstall the wheel cover if it fits the spare. Do not force a cover onto a compact spare that was not designed to accept it.
Understand Compact Spare Limits
A compact spare, sometimes called a temporary spare or “donut,” is intended to get the vehicle to a suitable repair location. It is not a permanent replacement for the normal tire. Its sidewall or label may specify a maximum speed, and the owner’s manual may state a maximum driving distance or other restrictions.
Follow the lowest applicable limit shown on the spare, vehicle label, or owner’s manual. Drive conservatively, avoid sudden steering and hard braking, and remember that the vehicle may handle differently. A compact spare can change traction, braking balance, ground clearance, and the operation of systems such as traction control or all-wheel drive.
Some vehicles require the temporary spare on a particular axle or prohibit its use on a drive axle without an additional procedure. All-wheel-drive vehicles can be especially sensitive to differences in tire circumference. Confirm the manufacturer’s instructions before driving farther than absolutely necessary.
Check the spare’s inflation pressure as soon as possible. Temporary spares often require substantially different pressure from the normal tires, and pressure should be measured when the tire is cold if practical. Replace or repair the damaged tire promptly rather than treating the spare as a long-term solution.
What to Do After the Tire Change
Drive slowly for the first few minutes and listen for vibration, rubbing, clicking, or unusual movement. Stop in a safe location if the vehicle pulls strongly, the spare appears low, a warning light flashes, or the wheel feels unstable. A tire-pressure monitoring system may need time to recognize the spare, or it may display a warning because the temporary tire lacks a sensor.
Have the original tire inspected before deciding that it can be repaired. A puncture in the tread may be repairable, while sidewall damage, a separated belt, or extensive driving while flat may require replacement. Ask a tire professional to check the spare’s pressure and the wheel’s lug-nut torque as well.
After the repair, return the jack and tools to their proper locations. Confirm that the spare is inflated, the jack operates smoothly, and the lug wrench fits the nuts. Replacing missing equipment before the next trip is much easier than discovering the problem during another flat.
Common Mistakes to Avoid
- Jacking on a soft shoulder: Gravel, mud, sand, and grass can let the base sink or slide.
- Using the wrong lift point: Body panels and suspension parts may not support the vehicle safely.
- Removing lug nuts before lifting: The wheel can rotate or the vehicle can shift while force is applied.
- Raising the vehicle too high: Extra height increases instability and is rarely necessary.
- Working underneath a factory jack: The jack is for wheel changes, not for supporting a person.
- Forcing a stuck wheel: Heavy impacts can destabilize the vehicle or damage components.
- Cross-threading lug nuts: Start every nut by hand and stop if it does not turn smoothly.
- Skipping final torque: Tight-looking lug nuts may still be improperly tightened.
- Ignoring spare-tire limits: A compact spare is an emergency mobility device, not a normal tire.
- Leaving the jack unsecured: Loose tools can become dangerous projectiles during sudden braking.
When Not to Use the Spare Tire Jack
Do not use the supplied jack if the vehicle is on a steep incline, the lifting point is damaged, the ground is unstable, or the jack appears bent, cracked, rusty, or incomplete. Stop if the vehicle starts leaning away from the jack, the base shifts, or the saddle is not contacting the approved point.
A roadside professional should handle a tire change when traffic is close, weather creates dangerous visibility, the vehicle is loaded unusually heavily, or the wheel is seized to the hub. Professional help is also wise if the tire is on the side facing traffic and the vehicle cannot be moved safely.
If the vehicle has air suspension, a low-clearance body, a modified suspension, oversized wheels, or a lift kit, the factory procedure may not apply exactly. Follow the vehicle-specific instructions rather than improvising with blocks or another jack point.
Frequently Asked Questions
Can I use the spare tire jack on any part of the vehicle?
No. Use only the reinforced jacking point identified in the owner’s manual or vehicle markings. The correct point supports the vehicle and keeps the jack saddle from slipping. A nearby frame section or body panel may look strong but can bend or fail.
Should I loosen lug nuts before using the jack?
Yes. Loosen each lug nut slightly while the flat tire remains on the ground, but do not remove the nuts until the vehicle is lifted. Ground contact prevents the wheel from spinning while you break the initial friction.
How far should I raise the vehicle?
Raise it only until the flat tire is just clear of the ground and the spare can be installed. The exact height depends on tire sizes and the vehicle design. Excessive height reduces stability and provides no safety benefit.
Can I get under a car supported by a spare tire jack?
No. Never place your body under a vehicle supported only by the factory emergency jack. Use properly rated jack stands and a safe maintenance procedure for under-vehicle work, or have a qualified professional perform it.
Should I use a torque wrench after installing the spare?
Yes, if one is available. Tighten the lug nuts to the manufacturer’s specified torque in a crisscross pattern after lowering the vehicle. If you do not have a torque wrench, tighten them firmly with the supplied wrench and have the torque checked as soon as possible.
Can I drive normally with a compact spare?
No. Follow the compact spare’s speed and distance limits, drive cautiously, and replace it with a properly repaired or full-size tire promptly. Handling, braking, traction control, and all-wheel-drive performance may change.
What if the wheel will not come off after removing the lug nuts?
Corrosion may have bonded the wheel to the hub. Do not use force that could destabilize the vehicle while it is elevated. If gentle rocking does not release the wheel, lower the vehicle safely and contact roadside assistance or a tire professional.
Conclusion
Learning how to use spare tire jack equipment is mainly a matter of choosing a safe location using the correct lift point raising the vehicle only as high.