NAK Rotary Shaft Seal Oil Seal 198400B-NAK 54.5x72x7mm

NAK Rotary Shaft Oil Seal 198400B-NAK – 54.5 x 72 x 7 mm

This NAK rotary shaft lip seal (part number 198400B-NAK) is a precision gearbox oil seal measuring 54.5mm inner diameter, 72mm outer diameter and 7mm height. It is used to prevent oil leakage at rotating shaft exits on a range of manual and automatic transmission applications. A deteriorated shaft seal causes oil leaks, which can lead to gearbox damage if left unattended.

Dimensions: ID 54.5 mm × OD 72 mm × Height 7 mm

Brand: NAK

OE / Cross-Reference Part Numbers: 198400B-NAK (NAK) · 19037052 (Corteco)

What is a rotary shaft seal used for in a gearbox?

Rotary shaft seals prevent transmission fluid from escaping around rotating shafts — such as input shafts, output shafts, and differential shafts. A failing seal causes leaks that can contaminate the clutch or deplete gearbox oil.

What dimensions do I need to check before ordering?

You must confirm the inner diameter (54.5 mm), outer diameter (72 mm), and height/width (7 mm) match your application exactly. Even a 0.5 mm difference will result in a poor seal.

Is this the same part as Corteco 19037052?

Yes — Corteco 19037052 is a recognised cross-reference for the NAK 198400B-NAK seal. Both share the same dimensions and lip design.

How do I know if my shaft seal has failed?

Signs include oil spots under the vehicle in the gearbox area, low gearbox oil level, and visible oil weeping or residue around a shaft exit point.

Can I fit this seal myself?

Shaft seal replacement typically requires removing the relevant shaft or axle and using a seal driver tool to press the new seal in squarely. It is recommended to have this done by a gearbox specialist.

Why Choose Eco Torque?

As specialists in gearbox rebuilds and repairs, Eco Torque takes pride in offering genuine gearbox parts, high-quality aftermarket alternatives and competitive pricing.

Need Help Finding the Right Part?

If you are unsure whether this part is compatible with your vehicle, send us your UK registration number or VIN and we will help you find the correct part.

Reference Number: ET2584