236305 - Seal Engine Part Land Rover Range Rover Defender, Series

236305 - Gearbox Mainshaft Oil Seal – Rear

- €3,10

€3,10

€3,10 - €3,10

€3,10

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Aftermarket: Quality alternative. This is a quality alternative, designed to fit and function like the original part, often at a more competitive price.

Gearbox Mainshaft Oil Seal for the rear of the manual gearbox, sealing the mainshaft where it passes through the rear of the mainshaft-and-gears section.

The seal runs on the rotating mainshaft and retains the gearbox oil at the output end, preventing it from weeping past the shaft. It is renewed whenever the rear of the gearbox is dismantled or an output leak develops.

Vehicle Model Land Rover Defender up to 2016
Land Rover Series 1
Land Rover Series 2 and 3

Fitment Notes SERIES I/II/IIA/III — Gearbox mainshaft oil seal, fitted rear (mainshaft and gears section)

Alternative Codes

236305R236305236305ESBR 0463

In stock 3 units

2 · Gouda 1 · Drachten

Express delivery available

30 more on the way · ETA 10-08-2026

When will my order arrive?

Order before 15:00 (Mon–Fri): same-day dispatch for in-stock items.
UPS Express (order before 14:00): dispatched today, delivered tomorrow where available.
Netherlands / Belgium / Germany: 2–4 working days.
Other EU countries + UK: 4–8 working days.
Outside EU/UK: delivery times vary — contact us for an estimate.

30 more units on the way — expected 10-08-2026. Orders beyond current stock are reserved from incoming stock and shipped as soon as they arrive.

Items may ship from multiple warehouses at no extra cost.

Job kits containing this part

This part is included in 0 job kit(s) below. Pick the kit that matches your vehicle and job, then add what you need.

Frequently asked questions

What does the 236305 gearbox mainshaft oil seal do?

The 236305 oil seal fits the rear of the manual gearbox mainshaft on Land Rover Series models, sealing the shaft where it passes through the rear of the gearbox. It runs on the rotating mainshaft and retains gearbox oil at the output end, stopping it weeping past the shaft.

When should the mainshaft oil seal be replaced?

Replace the mainshaft oil seal whenever the rear of the gearbox is dismantled or an output-end oil leak develops. It's standard practice to renew the seal during any rear gearbox work, since reaching it again means stripping the assembly.

What are the signs the mainshaft oil seal has failed?

A failed mainshaft oil seal typically shows as gearbox oil weeping from the rear output, drips under the back of the gearbox, or a dropping oil level. The seal hardens and leaks with age. Renewing it stops the leak at the gearbox output.

Can the old oil seal be reused?

No, gearbox oil seals shouldn't be reused. Once removed the sealing lip is typically distorted and won't seal reliably, so fit a new 236305 seal whenever the gearbox is opened. Reusing an old seal usually leads to repeat leaks.