Head Gasket Replacement

Head gasket replacement, diagnosed on site with a proper gas test first so the fault is confirmed before the engine is opened.

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Service Info

Typical Duration 10 hours

We confirm the failure with a combustion gas test and pressure test, establish why the engine overheated, remove the head and have it checked for flatness and cracks, fit a new gasket with new torque to yield bolts, address the cooling system and refill with fresh oil and coolant.

Skip the garage, our master mechanics come to you

At your home or office
Fair & transparent pricing
6-month, 6000km warranty

The Most Trusted Head Gasket Replacement

The head gasket seals the cylinder head to the block, containing combustion pressure while keeping coolant and oil in their separate passages. When it fails, those separations break down: coolant enters the cylinders, combustion gases pressurise the cooling system, or oil and coolant mix. Michanic confirms a head gasket failure with a proper test at your home or office before any engine is opened, because the diagnosis is what protects you from an unnecessary major repair.

Why Choose Our Head Gasket Replacement Services?

  1. Tested, Not Assumed:
    A combustion gas test on the coolant confirms the failure definitively. Overheating alone is not proof, and a wrong diagnosis here is expensive.
  2. Cause Established:
    Head gaskets usually fail because the engine overheated. Fixing the gasket without finding why leaves the same fault waiting.
  3. Head Checked for Flatness:
    A warped or cracked head will blow a new gasket quickly. The head is skimmed or replaced based on measurement.
  4. Honest Scope and Cost:
    This is one of the largest jobs on a car. You hear what it involves, and whether it is worth doing on your vehicle, before committing.

Why We are the Best Choice for Head Gasket Replacement

  • Proper Diagnosis First:
    Coolant loss, white smoke and overheating have several causes. Gas testing and pressure testing separate them before anything is dismantled.
  • Bolts Renewed:
    Most head bolts are torque to yield and single use. Reusing them is a common cause of a repeat failure.
  • Cooling System Overhauled:
    Thermostat, water pump and radiator condition are addressed, since the overheating that killed the gasket usually started with one of them.
  • Oil Changed After:
    Coolant contaminated oil is drained and the engine refilled, because running a fresh gasket on contaminated oil damages bearings.

A head gasket failure is the point at which a cooling problem becomes an engine problem. Combustion pressure entering the cooling system pushes coolant out and causes more overheating, which warps the head further. Coolant entering a cylinder washes oil from the bore and can hydraulically lock the engine, which bends a connecting rod. Coolant in the oil destroys bearings within a short distance. This is why continuing to drive an engine with a failed gasket, even gently, so often converts a repairable engine into a replacement.

Frequently Asked Questions

  • How do I know if my head gasket has failed?
    A combustion gas test on the coolant is the definitive check. Supporting signs are sweet white smoke that does not clear, coolant loss with no external leak, bubbles in the expansion tank and emulsion on the oil cap.
  • Can head gasket sealant fix it?
    Only as a very temporary measure. These products circulate through the whole cooling system and commonly block the radiator and heater core, creating additional problems while the gasket continues to fail.
  • Why did my head gasket fail?
    Overwhelmingly because the engine overheated, which is usually traced back to a failed thermostat, water pump, cooling fan or a low coolant level. Finding that cause is part of the repair, not optional.
  • Does the cylinder head need skimming?
    It depends on measurement. Overheating warps aluminium heads, and fitting a new gasket to a warped surface fails again quickly. The head is checked for flatness and cracks, and skimmed or replaced accordingly.
  • Is it worth repairing on an older car?
    Sometimes not, and you will hear that plainly. It is one of the largest jobs on a car, and on a high mileage vehicle the cost can approach its value. That assessment comes before any commitment, not after.