Parts for your 2009 Mazda Premacy-Head gasket

2009 Mazda Premacy head gasket — what it does and how to look after it

A head gasket is absolutely used on the 2009 Mazda Premacy (Mazda5). Technical references that confirm this include the Mazda Premacy/Mazda5 Workshop Manual (2008–2010, Engine: Cylinder Head — Removal/Installation), the Mazda L‑series (LF‑VE 2.0L and L3‑VE 2.3L) Engine Workshop Manual, and Mazda’s Electronic Parts Catalogue, all of which list the cylinder head gasket and the torque‑to‑yield head bolts, along with tightening sequences and replacement procedures. The 2.0 diesel option (MZR‑CD) is also specified with a conventional head gasket in its engine manual.

On this model, the head gasket’s job is to seal the combustion chambers and keep the oil and coolant circuits from mixing between the alloy cylinder head and the block. It maintains compression, prevents coolant loss, and stops oil contamination. When it’s healthy, you get proper power, clean running, and a cooling system that behaves itself under the bonnet.

There’s no scheduled replacement interval — a good gasket should last the life of the engine if the cooling system is kept in top nick. That means running the correct long‑life coolant (Mazda FL22 or equivalent), changing it on time, and fixing any overheating or leaks quickly. Overheating is the number‑one head‑gasket killer.

• Common warning signs: unexplained coolant loss, white steam from the exhaust when warm, pressurised hoses from cold, milky oil, rough cold starts, misfires, or bubbling in the expansion tank.
• Smart checks before tearing in: cooling‑system pressure test, chemical block test for combustion gases in coolant, compression or leak‑down tests.

If replacement is needed, it’s a proper spanner job. The cylinder head comes off, the mating surfaces are cleaned and measured, and the head is only skimmed if it’s outside the flatness spec. The MZR engines use a multi‑layer steel (MLS) gasket, matching the correct gasket type/thickness per Mazda spec is important. Always fit new head bolts — Mazda specifies torque‑to‑yield bolts and provides an exact tightening sequence and angle stages in the workshop manual. Timing is chain‑driven on these engines, so correct cam timing and locking tools matter during refit. It’s also a great time to fit a new thermostat, inspect hoses, and refresh the coolant.

After the job, bleed the cooling system properly, change the engine oil and filter (coolant may have entered the sump), and recheck levels and for leaks after a few heat cycles. Treated right, the new gasket will go the distance for many more kilometres.

Popular questions

Q: How much does a head gasket replacement cost on a 2009 Mazda Premacy?

A ballpark for Australia and New Zealand is roughly $1,800–$3,500 AUD/NZD, depending on labour rates, machining, parts quality (gasket set, bolts, seals), and whether timing components or the water pump are addressed. Severe overheating or corrosion can push costs higher.

Q: Can a bottle of head‑gasket sealer fix it?

Sealants can sometimes provide a short‑term reprieve for minor seeps, but they’re not a proper repair and can gum up radiators and heater cores. For a reliable, long‑term result on a Premacy, a correct gasket replacement following Mazda procedures is the go.

Q: What coolant should be used after a head‑gasket job?

Use Mazda FL22 long‑life coolant (or an equivalent that meets the same spec) mixed correctly. Don’t mix types, and always bleed the system thoroughly to avoid airlocks. Keeping the cooling system healthy is the best insurance for the new gasket.