Parts for your 2025 Mitsubishi Eclipse cross-Head gasket

2025 Mitsubishi Eclipse Cross head gasket — what it does and how to look after it

Yes, a head gasket is fitted to the 2025 Mitsubishi Eclipse Cross. Technical sources including Mitsubishi Motors workshop manuals (engine overhaul sections for the 1.5‑litre MIVEC turbo‑petrol and the 2.4‑litre Atkinson‑cycle petrol used in the PHEV) and Mitsubishi ASA/Global parts catalogues list a cylinder head gasket and the related replacement procedures for MY2025. That makes the head gasket a relevant, critical part on both the petrol and PHEV variants.

The head gasket lives between the cylinder head and engine block, sealing in combustion while keeping engine oil and coolant in their own passages. On the 1.5‑litre turbo, it has to handle boost pressure and constant heat cycling, on the PHEV’s 2.4‑litre, it copes with frequent start–stop operation. Modern Eclipse Cross gaskets are multi‑layer steel (MLS) designs that use embossed layers and sealing coatings to maintain clamping force, protect the “fire ring” around each cylinder, and prevent cross‑leaks between coolant and oil circuits.

It’s not a scheduled service item, so the best “maintenance” is protecting it from overheating and detonation. That means sticking to the factory coolant type and change intervals in the logbook, keeping the cooling system healthy (radiator, fans, water pump, thermostat), and ensuring the engine management is up to date. Under the bonnet, regular checks for leaks and correct coolant level go a long way.

• Warning signs owners and techs watch for:
  • Unexplained coolant loss, overheating, or pressurised hoses when cold
  • White, sweet‑smelling vapour from the exhaust after warm‑up
  • Milky residue under the oil cap or “chocolate milk” on the dipstick
  • Rough cold starts, misfire, or low compression on one cylinder
  • Persistent bubbles in the expansion tank under light revs

If replacement is needed, it’s a precision job best handled by a qualified workshop. The cylinder head is removed, cleaned, and checked for flatness and cracks, the surface finish must suit an MLS gasket. New head bolts (typically torque‑to‑yield) are fitted and tightened in the exact sequence with torque‑plus‑angle specs from the Mitsubishi manual. Timing components must be correctly indexed, fresh oil and coolant are added, and the cooling system is bled. For the PHEV, high‑voltage isolation procedures must be followed before any engine work.

Treat the cooling system well, keep an eye on temps on long summer climbs across NZ and Australia, and the Eclipse Cross head gasket should stay happy for many kilometres.

FAQs

Does the 2025 Mitsubishi Eclipse Cross have a head gasket?
It does. Both the 1.5‑litre MIVEC turbo‑petrol and the PHEV’s 2.4‑litre petrol engine use a multi‑layer steel head gasket. Mitsubishi’s workshop manuals and parts catalogues list the gasket and the removal/installation procedure for MY2025.

Is the head gasket a regular service item?
No. It’s only replaced if there’s a failure or when the head is off for other major work. Routine care is about prevention: correct coolant type and intervals, leak checks, and making sure the engine never overheats.

What are common signs of head‑gasket trouble?
Coolant loss with no obvious leak, overheating, white exhaust vapour after warm‑up, milky oil, or a misfire on cold start. A specialist can confirm with tests such as a cooling‑system pressure test, combustion‑gas (CO₂) check in the coolant, or a compression/leak‑down test.