Parts for your 1998 Daihatsu Gran move-Manifold gasket

1998 Daihatsu Gran Move manifold gasket — what it does and how to look after it

According to Daihatsu’s Gran Move/Pyzar (G303/G311) workshop manual and the Daihatsu Electronic Parts Catalogue, the 1998 Gran Move runs both an intake manifold gasket and an exhaust manifold gasket on its petrol HD-E series engine. These gaskets are very much used and relevant: the EPC lists separate gasket items for the intake manifold-to-head joint and the exhaust manifold-to-head joint, and the factory manual outlines specific torque sequences for refitting each. That makes “manifold-gasket” a genuine service item on this model.

On this Gran Move, the manifold gaskets seal the mating faces so air, fuel, and exhaust gases only go where they should. The intake manifold gasket keeps unmetered air out so the engine doesn’t run lean, idle rough, or throw fuel-trim faults. The exhaust manifold gasket locks in hot gases so there’s no ticking leak under the bonnet, no exhaust smell in the cabin, and no false oxygen-sensor readings that can upset fuel economy.

They aren’t on a fixed replacement interval, but they’re wise to change any time the manifolds are removed. As part of regular servicing, it’s worth a simple check:

• Listen for a sharp ticking on cold start (exhaust leak) or a hissing/vacuum squeal (intake leak).
• Look for soot tracks around the exhaust manifold flange or damp/clean “wash” marks at the intake joint.
• Watch for rough idle, a high idle, or lean codes after other intake work.

If a gasket’s leaking, new quality gaskets are the go. Clean the head and manifold faces carefully—no gouging—and chase the threads. On the exhaust side, soak studs and nuts with penetrant and replace any corroded hardware, coastal Aussie and Kiwi cars are notorious for seized studs. On the intake side, check vacuum hoses and PCV connections while you’re in there.

Refit using the factory torque pattern and spec from the Daihatsu workshop manual, working from the centre out in stages. Don’t slather RTV everywhere—use sealant only where the manual specifies. After a few heat cycles, a quick spanner check on accessible fasteners can help, but don’t overdo it—overtightening can warp the manifold and crush the gasket.

When done right, a fresh manifold gasket restores quiet running, tidy emissions, and smooth drivability—exactly how a well-kept 1998 Gran Move should feel.

Popular questions about 1998 Daihatsu Gran Move manifold gaskets

What are the common signs a manifold gasket has failed on a Gran Move?
Owners usually notice a ticking noise on cold start that softens as it warms (exhaust leak), or a hissing sound and unstable idle (intake leak). Soot around the exhaust flange, fuel-trim/lean fault codes, increased fuel use, and an exhaust smell near the bonnet are other tell-tales.

Does it have separate intake and exhaust manifold gaskets, and should both be replaced together?
Yes, the Gran Move uses separate gaskets for intake and exhaust. Replace the one you disturb or the one that’s leaking. If the manifold is off for any reason, fit a new gasket as cheap insurance and inspect the other side for aging or damage.

Is this a DIY job at home?
For a competent DIYer with basic tools it’s doable, especially the intake side. The exhaust side can be trickier due to heat-cycled studs and tight access. Allow time, follow the factory torque sequence, and be ready with new studs/nuts if they’re crusty. If in doubt, a mechanic with Daihatsu experience will save headaches.