Parts for your 1998 Daihatsu Gran move-Oil pump

1998 Daihatsu Gran Move oil pump — what it does and how to look after it

Technical sources confirm the 1998 Daihatsu Gran Move (also known as the Pyzar) is fitted with an engine oil pump. The factory workshop manual’s lubrication section specifies a crankshaft-driven trochoid (internal-gear) pump housed in the front cover, and the Daihatsu/Toyota electronic parts catalogue lists an oil pump assembly for Gran Move models of this era. So yes — an oil pump is absolutely relevant on this vehicle.

On a 1998 Gran Move, the oil pump’s job is simple but vital: build oil pressure and send clean oil to bearings, camshafts, and other moving bits so the engine stays cool, quiet, and long-lived. It’s a crank-driven trochoid unit up front, meaning whenever the engine spins, the pump is working. If pressure drops, the dash warning lamp can flicker and the top end may start ticking — both clear signs to stop and check things under the bonnet.

Routine servicing is what keeps the oil pump happy. Fresh oil and a quality filter at the intervals in the owner’s handbook (commonly every 10,000 km or six months in Aussie and Kiwi conditions) prevent sludge that can starve the pickup and wear the pump’s rotors. Always use the correct oil grade for the engine and climate, and don’t overdo sealant during sump or front cover work — loose RTV strings love to block the pickup screen.

Replacement of the oil pump isn’t a regular maintenance item, it’s usually done during an engine rebuild or when low oil pressure is confirmed with a mechanical gauge. Many “oil pump problems” turn out to be a clogged pickup, tired bearings, thin oil, or a dodgy pressure switch, so proper diagnosis matters. When a pump is replaced, it should be primed with clean oil during assembly, the relief valve checked for free movement, and all clearances verified to specs in the workshop manual. New gaskets or RTV, a fresh crank seal, and careful torqueing of the front cover fasteners help avoid leaks.

• Watch-fors: oil light at hot idle, rattly lifters after a normal rest, metallic rumble under load, or oil full of glitter.
• Good practice: inspect the pickup screen whenever the sump is off, keep breather/PCV systems clear, and fix any coolant or fuel dilution issues promptly.

Done right, the Gran Move’s oil pump will quietly clock up the kilometres without fuss, keeping that tidy little Daihatsu humming along.

Popular questions

Does the 1998 Daihatsu Gran Move have an oil pump?
Yes. The Gran Move uses a crankshaft-driven trochoid oil pump in the front cover. This is documented in the factory workshop manual’s lubrication section and reflected in the parts catalogue for Gran Move/Pyzar models. It’s a conventional setup for late‑90s Daihatsu petrol engines.

How often should the oil pump be replaced on a Gran Move?
There’s no fixed replacement interval. The pump is typically only replaced during an engine overhaul or if low oil pressure is confirmed with a gauge and other causes (pickup blockage, worn bearings, faulty switch) are ruled out. Regular oil and filter changes are the best “maintenance” the pump needs.

What are signs the oil pump or lubrication system needs attention?
A flickering oil warning lamp at hot idle, tapping from the top end, or a rumbling bottom end under load all warrant an immediate pressure test. If pressure is low, check oil level and condition first, then inspect the pickup screen and pressure switch before condemning the pump.