Why quality engine parts matter, and where to get them
In short: diesel injection systems and turbochargers work under extreme pressure and heat, so parts that are even slightly off-spec cause poor fuel delivery, smoke, lost power and wear. Genuine parts, and aftermarket parts made to the right specification, fit correctly and avoid the cost of doing the job twice.
Your diesel engine is a precision machine. Whether it's hauling freight across the country, powering a farm through harvest, or keeping a trade van running five days a week, what you put into it determines how long it lasts and how much it costs you.
1. The cost of downtime is real
For mechanics, fleet managers and owner-operators, a vehicle out of action means lost revenue. A cheap, generic part that fails in three months costs you twice: once at purchase, and again when the job comes to a halt.
Genuine parts, and aftermarket parts made to the right specification, fit correctly and don't introduce new problems when installed.
Simms Diesel delivers stocked items across New Zealand in 2–5 working days, and quotes freight for international orders.
2. Not all parts are created equal
The diesel parts market has no shortage of cheap, unbranded components that look the part. The problem is tolerances. Diesel injection systems and turbochargers operate under extreme pressure and heat, and components that are even slightly off-spec can cause poor fuel delivery, excessive smoke, reduced power or wear on surrounding parts.
Simms Diesel stocks parts from the brands your engine was built around, including Bosch, Delphi, Denso and Stanadyne for fuel injection, and parts for Cummins, Perkins, CAT, Yanmar and Scania engines.
3. Specialist knowledge behind every part
Simms Diesel isn't a general auto parts warehouse. Since 1927, the team has specialised in diesel fuel injection systems, turbochargers and governors. You can ask a question and get a real answer, not a catalogue lookup.
If you're not sure which injector suits your pump, or you need an EUI tested or rebuilt, you're talking to people who work on these systems every day in our Auckland workshop.
Can't find what you need? Send us a part request and we'll source it for you.
4. A warranty you can rely on
New parts and exchange units from Simms Diesel come with a 12-month or 20,000 km warranty from the date of invoice. If something isn't right, there's a clear warranty process to follow.
Engine parts questions
What warranty do Simms Diesel parts have?
New parts and exchange units come with a 12-month or 20,000 km warranty from the date of invoice. See our warranty page for the claims process.
How long does delivery take?
Stocked items are delivered across New Zealand in 2–5 working days. International orders are by freight quote.
Do you sell genuine or aftermarket parts?
Both. You can ask for either, or for options in each, when you send a part request.
What if the part I need isn't listed online?
We hold far more parts than we list online. Send us a part request with the part number, vehicle or engine and we'll source it.
Simms Diesel & Turbocharger Service is based in Auckland and has supplied New Zealand mechanics, fleet operators and diesel owners since 1927.
