Auckland's Diesel Parts & Service Specialists
Simms Diesel is Auckland's one-stop shop for diesel parts and workshop services, supplying over 35,000 parts for everything from turbochargers and fuel systems to heating and cooling, electrical components, filters, governors, and more. We stock genuine and aftermarket parts from the world's leading brands — with next-day delivery available across New Zealand.
Our in-house workshop goes beyond parts supply, offering diesel pump rebuilds, turbocharger reconditioning, DPF cleaning, CAT repair, petrol injector servicing, vehicle diagnosis, and governor servicing — all from our Auckland base. Whether you're a trade workshop or a DIY mechanic, if you need a diesel part or diesel repair, Simms has you covered.
FEATURED PRODUCTS
ENGINE PARTS
SHOP BY CATEGORIES
WHAT WE SERVICE
Built for diesel across industries - if it runs on diesel, we can likely help.
HEAVY TRUCKS & FLEET VEHICLES
Downtime costs money. We provide
accurate diagnostics and dependable
diesel pump repairs to keep
commercial fleets operating without
unnecessary delays.
AGRICULTURAL MACHINERY
Built for peak season performance.
We service diesel systems in tractors,
harvesters and farm equipment to
maintain consistent fuel delivery
under load.
MARINE DIESEL ENGINES
Reliable performance offshore and
inshore. We diagnose and repair
marine diesel injection systems for
dependable power on the water.
CONSTRUCTION & HEAVY PLANT
Fuel systems built for high-load cycles.
We repair and calibrate diesel pumps in
excavators, loaders and plant
equipment with precision.
LIGHT COMMERCIAL & UTES
Built for reliability in everyday work vehicles. We service and repair diesel systems in utes, vans and light commercial fleets to ensure efficient performance, reduced downtime and consistent fuel delivery under load.
INDUSTRIAL & STATIONARY ENGINES
Engineered for continuous operation and heavy-duty demands. We diagnose, repair and calibrate diesel fuel systems in generators, pumps and stationary equipment to deliver reliable power and long-term efficiency.
Cant find a part?
Simms Diesel has been operating for over 99 years. Over this time, we've built strong relationships with trusted, high-quality suppliers from around the world.
Let us source it for you. Any industry any product. Tell us your requirements and let us find it!
WHAT OUR CUSTOMERS SAY
Fast shipping. Found the exact part I needed.
Best diesel parts supplier I've used in NZ. Excellent communication.
Ordered a turbo and it arrived next day. Quality parts and great pricing.
Helpful team and genuine parts. Highly recommend Simms Diesel.
