Parts for your 1998 Daihatsu Gran move-Head gasket

1998 Daihatsu Gran Move head gasket: what it does and when to replace it

Yes, a head gasket is absolutely used on the 1998 Daihatsu Gran Move (G300 series, also known as Pyzar). Technical sources that list or illustrate the part include the Daihatsu G300 workshop manual and Electronic Parts Catalogue, along with Australian and New Zealand aftermarket catalogues from well-known gasket suppliers (such as Permaseal/ACL and Victor Reinz) that provide head gasket and full head set listings for the H‑series inline‑four petrol engines fitted to this model. These references confirm a conventional cylinder head gasket between the aluminium cylinder head and the cast‑iron block.

On this Gran Move, the head gasket seals three critical paths: combustion pressure in the cylinders, coolant passages, and oil galleries. When it’s healthy, the engine runs smoothly, holds compression, and keeps oil and coolant where they belong. When it’s tired or has been stressed by overheating, owners may see tell‑tales like rising temperature, white exhaust steam, oil that looks milky, coolant loss with no external leaks, rough starting, or a sweet smell from the exhaust.

Because the head gasket lives a hard life—especially if the cooling system’s been neglected—sensible servicing helps it last. For this model, it pays to keep coolant fresh (correct spec and concentration), ensure the radiator is clean and flowing, and replace the thermostat and radiator cap at reasonable intervals. Any sign of overheating should be fixed straight away, the gasket won’t forgive repeated heat soak.

If replacement is on the cards, the job is methodical rather than mysterious. A competent workshop will typically:

• Pressure test and skim the cylinder head if required, checking warpage against the workshop manual spec.
• Use the correct new head gasket and new head bolts (the factory design commonly uses torque‑to‑yield fasteners).
• Follow the specific tightening sequence and staged torque/angle settings from the Daihatsu manual.
• Renew ancillary gaskets and seals (intake, exhaust, rocker cover) and fit a fresh timing belt if due.
• Flush and refill with the right coolant, bleed the system, and verify fans and thermostat operation.

Treated kindly—regular coolant changes, no overheating—the Gran Move’s head gasket generally gives long, uneventful service. Spot problems early and it’ll keep doing the school run and weekend missions without fuss.

Popular questions about 1998 Daihatsu Gran Move head gaskets

How long does a head gasket typically last on a Gran Move?
With proper cooling‑system maintenance and no overheating events, many see well over 200,000 km without gasket trouble. Age alone isn’t the killer, heat cycles and coolant neglect usually are. Keep the cooling system tidy and the gasket tends to stay happy.

What are the first signs the head gasket might be failing?
Common early clues include unexplained coolant loss, a pressurised upper radiator hose from cold, persistent heater misbehaviour, or white exhaust vapour after warm‑up. A chemical block test, cooling‑system pressure test, and compression/leak‑down checks can confirm suspicions before damage escalates.

Should the head bolts be replaced during a head gasket job?
Yes, on this engine it’s best practice to replace the head bolts. They’re typically torque‑to‑yield and are designed to stretch within limits. Reusing them risks uneven clamping and an early repeat failure. New bolts, correct torque/angle, and a clean, flat mating surface make all the difference.