Oil Pump – Austin Healey 100 BN1

A vintage-style illustration of a red Austin Healey 100 parked outside a blue AH Spares garage, with a rustic brick building displaying an “Austin Genuine” sign and an idyllic English village with a church tower and timber-framed houses in the background, all set on a sunny summer’s day.

Why This Upgrade Matters

Oil pressure is the lifeblood of your Healey’s four-cylinder engine. Early cars often suffer from uneven oil flow as tolerances widen with age. This new oil pump has been digitally modelled in CAD to original factory dimensions, CNC-machined from British castings, and hand-assembled in the UK. The result is consistent lubrication whether you’re touring long-distance or heading out for a spirited drive.

Beyond protecting bearings, a properly engineered oil pump minimises cold-start delays and stabilises hot-idle pressure. In other words: less wear, fewer surprises, and more confidence every time you fire up your Healey 100.

CAD drawing of Austin Healey 100 oil pump showing internal structure and drive shaft alignment

How it’s made

Digital blueprint – Original Healey pump geometry captured in CAD, with refinements to reduce turbulence.
CNC machining – British castings milled to ±0.01 mm for true concentricity and smooth passages.
Assembly – Engineers hand-fit components, check clearances, and finish each unit to specification.

The result is a pump that behaves just as the designers intended—without the common weaknesses of ageing originals.

Quick-Look Benefits
Feature	Benefit to you
CAD reverse-engineer	Matches Healey tolerances exactly
British CNC machining	Consistent oil flow with minimal wear
Hand-assembled in UK	Built to specification and ready to install
Direct BN1/BN2 fit	Bolts straight onto your block
Covers 100M/100S	Works on all four-cylinder Healey 100 variants

CAD-designed aluminium oil pump for Austin Healey 100 models, showing machined surfaces and mounting points

Installation insights

Installation is straightforward: remove the old pump, fit the new unit with a fresh gasket, torque to Healey spec, reconnect the drive shaft and distributor. Key checks before firing up:

Inspect drive shaft splines—worn splines can affect pump timing.
Always fit a new sump gasket to prevent leaks.
Prime the pump with oil before first start.

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Precision-machined Austin Healey 100 oil pump drive shaft with polished finish and helical gears

Pair it with the matching drive shaft

The pump can only do its job with the correct drive shaft linking it to your distributor. If your shaft is original, it’s worth checking—60 years of wear can cause misalignment.

Our replacement shaft is built to factory dimensions, designed to mesh precisely with both the pump and distributor. No wobble, no guesswork.

Why replace at the same time?

Correct engagement depth – Matches Healey 100 specification
Perfect fit with our pump – Designed as a companion part
Simple install – Slot-in replacement, no modifications
Extra peace of mind – Avoids misalignment and early wear

Shop the Drive Shaft

Frequently Asked Questions

Will this oil pump fit my 100M or 100S?

Yes—BN1, BN2, 100M and 100S models all share the same oil pump specification, so this unit is a direct fit for all Austin Healey 100 four-cylinder variants.

Do I need a new gasket when fitting the pump?

Yes, always use a new oil sump gasket when fitting or replacing the pump. This ensures a proper seal and prevents leaks.

What oil pressure can I expect after installation?

With correct installation, oil pressure will align with factory specifications—typically 25–35 psi at cold start, with stable readings at hot idle.

How often should I inspect or service the oil pump?

Inspect the pump at each major service interval (roughly every 5,000 miles). CNC-machined finishes make wear easy to spot.

Bringing It All Together

Pairing a CAD-designed, CNC-machined oil pump with a fresh drive shaft and sump gasket restores your Healey 100’s lubrication system to proper working order. Expect steadier pressure, smoother running, and fewer “under the bonnet” moments—so you can focus on enjoying the drive.

Ready to fit yours?

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CAD-Designed Oil Pump for Austin Healey 100 BN1-BN2