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Premium Water Pump – 3/8-Inch Pulley | BN4–BJ8

Big Healey

Part no:

CHT125

Product name:

Premium Water Pump – 3/8-Inch Pulley | BN4–BJ8

Additional information:

Description:

This premium replacement water pump is designed for six-cylinder Austin Healey 100-Six and 3000 models from BN4 to BJ8 using the 3/8-inch fan belt arrangement. It circulates coolant through the engine and radiator and is suitable for replacing a worn, noisy or leaking pump. Manufactured in the UK with precision-machined components and modern sealing, it includes the pulley and mounting gasket.

Key Features and Construction

CAD-designed for consistent manufacture and accuracy.
Manufactured in the UK by qualified engineers.
Quality castings with CNC-machined components.
Modern carbon-ceramic/nitrile mechanical seal.
Quality bearings for smooth shaft rotation.
Supplied with 3/8-inch pulley and mounting gasket.

Vehicle Application

Suitable for six-cylinder Austin Healey BN4, BN6, BN7, BT7, BJ7 and BJ8 models using a 3/8-inch fan belt.

Before ordering: Check the existing pulley and fan belt width. Some BJ8 models use a 1/2-inch arrangement and require the alternative premium water pump, CHT127.

Technical Details

Part number: CHT125
OE reference: GWP112
Pulley type: 3/8-inch belt
Mechanical seal: Carbon-ceramic/nitrile
Quantity required: One per vehicle

Related Cooling Parts

Fan Belt | BN4-BN6: CHT138
3/8-Inch Fan Belt | BN7/BT7-BJ8: CHT139
5-Blade Cooling Fan - Yellow | BN4-BJ8: CHT147

OE part number:

GWP112

Application:

BN4 - BJ8

Quantity per vehicle:

Items Per Pack:

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Your Price:

£141.86 Exc VAT
£170.23 Inc VAT

Quantity:

Frequently Asked Questions

Does the pump come complete with a pulley and gasket?

Yes. The pump is supplied with its 3/8-inch pulley and mounting gasket. The fan belt is available separately.

Is this the correct pump for every BJ8?

No. BJ8 models can have either a 3/8-inch or 1/2-inch pulley arrangement. Check the existing fan belt and pulleys before ordering. CHT127 is the corresponding premium pump for the 1/2-inch arrangement.

What makes this different from the standard water pump?

This premium version uses CAD-designed, CNC-machined components, quality castings and a modern carbon-ceramic/nitrile mechanical seal. It is manufactured in the UK and provides an alternative to the standard replacement pump CHT126.

Which Austin Healey models use this water pump?

It is suitable for six-cylinder Austin Healey 100-Six and 3000 models from BN4 to BJ8 that use the 3/8-inch fan belt arrangement.

Which fan belt should I order with this pump?

CHT138 is the corresponding fan belt for BN4 and BN6 models. CHT139 is suitable for BN7, BT7, BJ7 and BJ8 models using the 3/8-inch arrangement. Check the existing belt and pulleys before ordering.