How to Replace the Manual Gearbox on a Ford Ka Mk2 1.2 Petrol

Ford · Ka · Maintenance

A whining, crunching or jumping-out-of-gear Ka Mk2 usually points to the same place: the little 5-speed manual gearbox bolted behind the 1.2 petrol engine. It's a simple, light transaxle, but like any gearbox it doesn't forgive years of worn synchros or a tired clutch dragging on it, and eventually a rebuild or a straight swap becomes the sensible option rather than another temporary fix.

Which gearbox does the Ka Mk2 1.2 use?

The Mk2 Ka's 1.2-litre petrol (engine code 169A4.000, badged FP4 in some parts catalogues) is paired with a Fiat-designed C510 5-speed manual transaxle — a legacy of the Ka's shared underpinnings with Fiat during this generation. It's a compact, relatively light unit, which is good news for anyone doing this job at home: it's manageable on a trolley jack rather than needing engine-hoist-level lifting gear.

Common failure symptoms

• Whining or humming noise that changes with road speed, not engine revs
• Crunching on changes into 2nd or reverse, even with the clutch fully depressed
• Gear popping out of engagement, particularly under load or on the overrun
• Notchy or vague gear selection that's got progressively worse
• Clutch pedal feel changing alongside gearbox symptoms — often the two wear together

Clutch kit reference

If the clutch is being renewed at the same time — sensible practice any time a gearbox is out, since labour to get back in is the expensive part — the commonly referenced OEM clutch kit for the Ka Mk2/Mk3 1.2 four-cylinder is Ford part 1806244. As always, cross-check this against your car's exact VIN before ordering, since running changes across the production life can mean a different kit applies to your specific build.

Gearbox oil capacity is commonly quoted at around 1.7 litres of 75W-80 GL-4 gear oil for a full refill — treat this as a guide figure and always top up to the correct level mark on the box itself rather than relying purely on the litre figure. No reliable torque spec could be confirmed for the gearbox mounting bolts or the driveshaft retaining nut on this model — check your own workshop manual or Ford's technical data for your VIN rather than guessing on a fastener that holds a rotating driveline component.

Replacing the Gearbox

Safety warning: this job involves supporting the engine/gearbox assembly while a major structural component is removed. Work on proper axle stands rated for the vehicle's weight, never a jack alone, and use a proper engine support bar or hoist — don't rely on a trolley jack alone to hold the engine while the box is detached. Disconnect the battery before starting, and be ready to catch a small amount of residual gear oil when the driveshafts are pulled.

Tools and parts you'll need

• Axle stands and a trolley jack, plus an engine support bar or hoist
• Socket set, breaker bar, torque wrench
• Driveshaft puller/removal tool
• New gearbox (reconditioned or new), or the necessary internal parts if rebuilding the existing unit
• New clutch kit if not recently replaced (see reference number above)
• 75W-80 GL-4 gear oil for the refill
• New driveshaft circlips and gaiter clips as needed

Removal procedure

1. Disconnect the battery. Raise and support the front of the car securely on axle stands.
2. Drain the gearbox oil into a suitable container.
3. Remove the front wheels, then disconnect both driveshafts from the gearbox using a suitable puller — don't lever directly against the casing.
4. Disconnect the gear linkage/selector cables from the top of the gearbox.
5. Disconnect the clutch cable or hydraulic slave cylinder line, and any reverse light or speed sensor wiring on the box.
6. Support the engine securely with an engine support bar or hoist, taking the weight off the gearbox mounts.
7. Remove the gearbox mounting bolts and the bell-housing bolts joining it to the engine.
8. Carefully draw the gearbox away from the engine, keeping it level so the input shaft clears the clutch without dragging, then lower it out on a jack.

Installation procedure

1. If the clutch is being renewed, fit it now with the gearbox out, following the correct centring procedure with an aligning tool.
2. Offer the (new or rebuilt) gearbox up to the engine, keeping it level so the input shaft locates into the clutch splines without forcing it.
3. Fit the bell-housing bolts and gearbox mounting bolts, torquing to the figure in your workshop manual.
4. Reconnect the driveshafts, fitting new circlips if the originals show any wear, and confirm each is properly seated and secure.
5. Reconnect the gear linkage/selector cables, clutch cable or hydraulic line, and any electrical connectors.
6. Refill the gearbox with 75W-80 GL-4 oil to the correct level.
7. Remove the engine support and refit the front wheels, then lower the car and torque the wheel nuts to spec.

Final checks and road test

Before driving, check for gear oil leaks at the driveshaft seals and the filler/drain plugs. With the engine running and the car stationary, work through all five gears and reverse to confirm clean, quiet selection. On the first drive, listen for the whine or crunch that prompted the job in the first place — it should be gone. If the clutch was renewed, allow for a short bedding-in period before judging the feel.

Troubleshooting and tips

• Still crunching after the swap: check the clutch is releasing fully — a clutch that isn't disengaging properly will make even a good gearbox crunch.
• Whine persists: confirm the correct oil grade and level were used — running a gearbox low or with the wrong oil accelerates bearing wear.
• Driveshaft clicking on full lock: check the CV joint boots weren't disturbed or torn during the driveshaft removal.
• Considering a used gearbox: ask for its mileage and any known history before fitting — a used box with the same worn synchros isn't really a fix.

Once it's back together, a healthy Ka Mk2 gearbox should feel tight and precise through all the gears with no whine, no crunch and no popping out under load. It's a bigger job than most Ka maintenance, but well within reach with the right support for the engine and a torque wrench for the fixings that matter.

While you've got things stripped down, it's worth checking the starter motor and alternator for age-related wear, or see our guide to the Ka's rear axle for another common structural job on this model. Browse all Ford Ka guides or the Maintenance category for more.