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Subaru Head Gasket Replacement and Engine Rebuilds

Subaru's boxer engines reward a workshop that knows them. Whether your engine is weeping oil or coolant, overheating, using oil or down on power, we diagnose the cause and explain the options before any work starts.

Subaru boxer engine on a stand with timing chains fitted during a Techworkz rebuild

How We Do an EJ25 Head Gasket and Engine Reseal

Head gasket leaks are a well-known issue on EJ-series engines such as the EJ25. We don't just swap gaskets. Our process:

1. Remove the engine and strip it to a bare short motor.

2. Hardness-test the cylinder heads before any machining.

3. Hot-wash all parts and hardware.

4. Scrub the block and piston tops clean.

5. Hand-deck the block with a finishing stone to remove low spots.

6. Inspect the sump oil pickup for debris or cracking.

7. Reassemble with only genuine gaskets and seals, replacing perished oil and water hoses.

EJ25 engine reassembled after a head gasket reseal at Techworkz
Subaru engine on a stand ready for refit

Do the Major Items at the Same Time

With the engine out, it's the best time to replace major service items such as the timing belt kit, water pump, spark plugs, clutch or radiator, which saves you paying for the labour twice.

Rebuilds and Performance Builds

From reconditioned engines and new short motors to forged performance builds with Carrillo pistons and rods, every engine is assembled in-house and can be checked on our 4WD dyno. We rebuild Subaru boxer engines, from older turbo and non-turbo engines to the latest models.

Carrillo forged pistons for a Subaru performance engine build

Book Your Car In

Call (02) 6293 2424, text 0482 094 924, or request a booking online. 76 Kembla Street, Fyshwick ACT 2609. Mon–Thu 7:30am–5pm, Fri 7:30am–3pm.

Address

76 Kembla Street, Fyshwick ACT 2609

Phone

(02) 6293 2424

​

0482 094 924 (text only)

Email

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© 2026 Techworkz Pty Ltd trading as Techworkz Automotive · 76 Kembla Street, Fyshwick ACT 2609 · (02) 6293 2424

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