Parts for your 2009 Honda Stream-Head gasket

2009 Honda Stream head gasket — what it does and when to sort it

Yes, the 2009 Honda Stream uses a head gasket. That’s confirmed in Honda’s own technical literature: the Honda Stream (RN6–RN9) Workshop Manual engine section details cylinder head removal/refit procedures that specify a head gasket and torque‑to‑yield head bolts, the Honda Electronic Parts Catalogue (EPC) lists a cylinder head gasket for both the 1.8‑litre R18A and 2.0‑litre R20A variants, and the Civic R18A service manual (same engine family) shows the multi‑layer steel head gasket and tightening pattern. So it’s a critical, fitted component on this model.

On the 2009 Stream, the head gasket sits between the aluminium cylinder head and engine block, sealing three things at once: high‑pressure combustion, coolant passages and oil galleries. A good seal keeps compression spot‑on for power and efficiency, and stops coolant and oil from mixing or leaking. Honda specifies a multi‑layer steel (MLS) gasket here because it copes well with heat cycles and maintains clamping force with the correct torque‑angle head bolts.

As part of ongoing servicing, the best “maintenance” for a head gasket is really cooling‑system care. Overheating is what kills most gaskets and can warp the head.

• Use the correct Honda Type 2 long‑life coolant and keep the mix right, refresh on schedule (typically 5 years/100,000 km, then every 5 years/80,000 km).
• Fix any leaks early and bleed air properly after cooling‑system work.
• Make sure the radiator cap, thermostat and fans are doing their job.

Signs a Stream’s head gasket may be on the way out include persistent overheating, a sweet exhaust smell with white vapour after warm‑up, unexplained coolant loss, milky residue under the oil cap, misfires on start‑up, pressurised hoses from cold, or bubbles in the header tank. A cooling‑system block test, compression or leak‑down test helps confirm it.

If replacement is needed, a proper job on the RN6–RN9 engines means new OEM‑spec MLS gasket, new head bolts, precise torque‑angle tightening in sequence, checking/skim of the head if out of spec, and spotless mating surfaces. The timing chain setup on the R18A/R20A needs correct TDC and cam timing during refit. It’s wise to renew the thermostat, radiator cap and any tired hoses at the same time to protect the fresh gasket.

Done right, the head gasket on a 2009 Honda Stream will go the distance. Keep the cooling system healthy, and it’ll keep commuting, carting the kids and chewing through kilometres without drama.

Popular questions about 2009 Honda Stream head gaskets

What are the common symptoms of a blown head gasket on a 2009 Honda Stream?
Owners most often report overheating, coolant loss with no visible leak, white exhaust vapour after warm‑up, mayonnaise‑like residue under the oil cap, rough idle or misfires, and hard upper radiator hoses when the engine is cold. A bubbling header tank can also point to combustion gases in the coolant.

A workshop can verify with a chemical block test for CO₂ in the coolant, plus compression or leak‑down tests to pinpoint the affected cylinder.

How much does a head gasket replacement cost in Australia or New Zealand?
Ballpark, a professional replacement on a Stream’s R18A/R20A typically runs around AUD $2,000–$4,500 or NZD $2,200–$5,000, depending on labour rates, machining needs, parts quality and any extras (water pump, thermostat, hoses). Engines that have overheated badly may need head straightening or valves attended to, which can add to the bill.

Choosing OEM‑quality gaskets and replacing the torque‑to‑yield head bolts is money well spent for long‑term reliability.

Can head gasket failure be prevented on the Stream?
Mostly, yes—by controlling heat. Stick with genuine‑spec coolant, keep the radiator clean, replace a lazy thermostat or weak cap, and fix leaks early. After any cooling‑system work, purge air thoroughly so hot spots don’t form.

If the temperature gauge climbs, don’t push on, back off, get air moving through the radiator, and have the cooling system checked before it cooks the gasket and warps the head.