Genuine Mazda Rear Differential Driveshaft Oil Seal • P043-27-238A

Genuine Mazda Rear Differential Driveshaft Oil Seal

Replacement Genuine Mazda differential side oil seal for all Mazda MX-5 Mk3, Mk3.5 and Mk3.75 NC models, including vehicles with standard and limited-slip differentials.

This oil seal is fitted in the side of the rear differential casing where the inner end of the driveshaft enters the differential.

The seal runs against the driveshaft sealing surface and retains the differential oil inside the casing while helping prevent road dirt, moisture and other contamination from entering around the rotating shaft.

The same seal is used on the left- and right-hand sides. Two seals are fitted per vehicle, while this listing supplies one Genuine Mazda oil seal.

• Part type: Rear differential side oil seal
• Common names: Driveshaft oil seal / differential output-shaft seal / axle-shaft seal
• Mazda catalogue description: Seal, Oil
• System: Rear differential and driveshaft
• Installation position: Differential casing where the rear driveshaft enters
• Side application: Left or right
• Differential application: Standard and limited-slip differential
• Quantity fitted per vehicle: 2
• Quantity supplied: 1 oil seal
• Driveshaft included: No
• Differential oil included: No
• Driveshaft retaining clip included: No
• Brand: Genuine Mazda
• Part No.: P043-27-238A
• Previous Mazda reference: P043-27-238
• Compact reference: P04327238A
• MX-5 fitment: Mk3, Mk3.5 and Mk3.75 NC

Typical reasons for replacement:

• Differential oil leaking around the driveshaft entry point
• Seal lip hardened, worn, split or damaged
• Driveshaft removed from the differential
• Seal damaged during driveshaft installation or removal
• Differential being rebuilt, replaced or resealed
• Driveshaft sealing surface showing oil staining
• Original seal distorted or incorrectly installed
• Preventative renewal during major drivetrain work

Quantity advice: One seal is used at each differential output, giving two per vehicle. This listing supplies one seal; order two when renewing both sides.

Fitment advice: This seal is used with the standard and limited-slip rear differential assemblies fitted to the MX-5 NC. It fits either the left- or right-hand driveshaft position.

Replacement advice: Renew the oil seal whenever it has been damaged during driveshaft removal or shows evidence of leakage. A used seal may not reseal correctly once its lip has been disturbed.

Driveshaft inspection: Inspect the driveshaft sealing surface for corrosion, scoring, burrs or excessive wear. A damaged shaft surface can cause a new seal to leak.

Retaining-clip inspection: Check the driveshaft retaining snap ring before refitting the shaft. Replace the clip if it is stretched, distorted or damaged.

Removal advice: Remove the original seal carefully using a suitable seal puller. Avoid scratching or distorting the differential-casing bore.

Installation advice: Clean the seal bore and lightly lubricate the new seal lip with the appropriate differential oil. Install the seal squarely to the position specified by Mazda using a suitable seal driver.

Driveshaft installation: Protect the new seal lip from the driveshaft splines during installation. Insert the shaft squarely and confirm that its retaining clip has engaged securely within the differential.

Oil-level advice: Check and correct the differential-oil level after installation. Running the differential with insufficient oil can cause rapid bearing and gear damage.

Leak inspection: Clean the differential casing after assembly and inspect the seal area after running or road testing the vehicle.

Other items to inspect: Check the driveshaft retaining clip, CV joints, CV boots, differential breather, drain and filler plugs, mounting bushes and the oil seal on the opposite side.

Useful tools / consumables: Vehicle lift or axle stands, driveshaft-removal tools, suitable pry bar, seal puller, correctly sized seal driver, soft-faced mallet, differential oil and a suitable filling pump.

Difficulty guide: DIY Difficulty: Moderate to Advanced. Seal installation is straightforward once accessible, but replacement requires driveshaft removal and careful handling of the differential casing and new seal.

Why Genuine Mazda? Genuine Mazda differential seals match the original casing bore, driveshaft sealing surface and lip arrangement. Correct fit is important for retaining differential oil while allowing the driveshaft to rotate without leakage.

What’s in the box: One Genuine Mazda rear differential driveshaft oil seal, part number P043-27-238A.

Installation notes: Raise and support the vehicle safely, drain or contain the differential oil as required and remove the relevant driveshaft according to the applicable Mazda workshop procedure. Extract the original seal without damaging the casing, then clean and inspect the bore and driveshaft sealing surface. Lubricate and install the replacement seal squarely using a suitable driver. Refit the driveshaft carefully, confirm positive engagement of the retaining clip, refill or correct the differential-oil level and inspect for leakage.