Parts for your 1999 Ford Falcon-Head gasket

1999 Ford Falcon head gasket — what it does and how to look after it

On the 1999 Ford Falcon (AU Series I/II), a head gasket is absolutely used and relevant. Technical references such as the Ford AU Falcon Workshop Manual (1998–2002), Gregory’s Service and Repair Manual for Ford Falcon AU 1998–2002, and Ford Australia service literature for the 4.0‑litre inline‑six and 5.0‑litre Windsor V8 all specify a cylinder head gasket fitted between the block and head. Both the I6 and V8 engines rely on this gasket to keep compression, coolant and oil where they’re meant to be.

The head gasket’s job is to seal the combustion chambers, oil galleries and coolant passages so the engine can build power without fluids crossing paths. On these Falcons, the original gasket is typically a composite design with steel fire rings, and many owners opt for a multi‑layer steel (MLS) upgrade at replacement for better durability—provided the head and block surfaces are prepped to the right finish.

Gasket trouble usually shows up after overheating, incorrect coolant, poor bleeding, or age‑related clamping loss from torque‑to‑yield head bolts. Under the bonnet, tell‑tales include:

• Milky residue on the oil cap or dipstick, or sweet‑smelling white exhaust smoke
• Unexplained coolant loss, bubbling in the overflow bottle, or pressure in hoses from cold
• Misfire on start‑up, uneven idle, or low compression on one or more cylinders

There’s no scheduled replacement interval—on a healthy cooling system a head gasket can last hundreds of thousands of kilometres. As part of regular servicing, it’s smart to keep the cooling system in top nick: run the correct ethylene‑glycol coolant mix with demineralised water, flush every 2–3 years, replace the thermostat and radiator cap as needed, and make sure the fan and water pump are doing their job. Avoid overheating at all costs, it’s the quickest way to cook a gasket or warp a head.

If replacement is on the cards, the workshop should:

• Check head and block flatness with a precision straight‑edge, machine only within spec
• Use new torque‑to‑yield head bolts and follow the exact Ford torque/angle pattern from the centre out
• Select a quality gasket suited to the surface finish (MLS needs finer RA than composite)
• Change engine oil and filter, thoroughly flush the cooling system, and bleed air properly

Done right, a fresh gasket on an AU Falcon—whether the trusty 4.0‑litre six or the 5.0‑litre V8—will seal tight, run cool, and keep the big Aussie sedan happily touring for years.

Popular questions

What are common symptoms of a blown head gasket on a 1999 Ford Falcon?
Owners often notice white, sweet‑smelling exhaust smoke, milky oil residue, unexplained coolant loss, or bubbling in the overflow bottle. A cold‑start misfire or rough idle can show coolant leaking into a cylinder. Overheating under load is another red flag that needs quick attention.

How much does a head gasket replacement cost in Australia or New Zealand?
Pricing varies by engine (I6 vs V8), region, and parts choice. As a ballpark, professional replacement usually lands in the four‑figure range AUD/NZD, especially if machining, new bolts, fluids, and incidentals are included. Costs rise if the head needs significant repair or the radiator and hoses are tired.

Can they keep driving with a suspected blown head gasket?
It’s risky. Continuing to drive can escalate repairs from a gasket job to a warped head or even bottom‑end damage. If symptoms show up, it’s best to park it, avoid pressurising the cooling system, and get a proper diagnosis and compression/leak‑down test sooner rather than later.