Corteco Oil Seal Crankshaft 20032405B 78x100x9mm

Corteco Crankshaft Oil Seal 20032405B – 78x100x9mm (Transmission End)

The Corteco 20032405B is a crankshaft oil seal for the transmission end of the engine. Constructed from PTFE/ACM composite material with a left-hand twist swirl and dust lip, it delivers superior oil retention and durability. A failed transmission-end crankshaft seal allows oil to contaminate the clutch or transmission bellhousing, causing clutch slip and potential gearbox damage.

Part Number: 20032405B (Corteco) / 82032405 (Corteco)

Specifications:

• Inner Diameter: 78 mm
• Outer Diameter: 100 mm
• Height: 9 mm
• Material: PTFE (polytetrafluoroethylene) / ACM (polyacrylate rubber)
• Fitting Position: Transmission End
• Swirl Type: Left-hand Twist
• Dust Cover: with dust lip

OE Cross References: 55180937 (Alfa Romeo / Fiat / Lancia), 82032405 (Corteco), 093177284 / 614860 (Opel/Vauxhall), 1612185E00 (Suzuki)

What is the difference between a timing-end and transmission-end crankshaft seal?

The timing-end seal is at the front of the crankshaft (behind the timing belt/chain pulley), while the transmission-end seal is at the rear (facing the gearbox). Both prevent oil from escaping the engine, but they differ in size and location.

What symptoms indicate a leaking rear crankshaft seal?

Oil staining or weeping from the rear of the engine block / bellhousing area, oil contaminating the clutch plate (causing slip or judder), or visible oil trails behind the engine.

Is PTFE/ACM better than standard rubber seals?

PTFE/ACM composite seals offer higher temperature resistance and longer service life compared to standard nitrile seals, making them well-suited to modern engines with tighter thermal margins.

Does this seal require a special installation tool?

A seal driver of the correct diameter is recommended to ensure even seating without distortion. Eco Torque can advise on tooling requirements.

Can I check compatibility by registration?

Yes — send us your UK registration or VIN and we will confirm this is the correct seal for your vehicle.

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: ET2372