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2006–2008 Subaru Forester

2006-2008 Subaru Forester EJ25 - Head Gasket Replacement Complete

🔧🔧🔧 Advanced 8-10 hours $485 DIY 1 views

Save $1,015 by doing it yourself! Shop cost: $1,500

Quick Video Tutorial

Parts You Need

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Total Cost
$484.95
Part Name Part Number Price Buy
Head Gasket Set TRQ SGA11365 $229.95
Cylinder Head Bolts EJ25-HEADBOLTS $50.00
Timing Belt Mitsuboshi Timing Belt $100.00
Valve Cover Gasket EJ25-VCG $30.00
Water Pump EJ25-WP $75.00

About prices: shown prices are estimates from typical Amazon listings and change frequently, and cheaper alternatives may be available. Confirm the current price on Amazon before buying.

💡 Pro tip: Order all parts at once to save on shipping

Step-by-Step Instructions

Follow these steps carefully

1

Diagnose, gather parts, and disconnect power

Confirm head-gasket failure on the 2006-2010 Subaru Forester EJ25 (coolant loss, milky oil, exhaust hydrocarbons in coolant, or a failed block test). Disconnect the negative battery cable. Drain coolant and engine oil. This is an advanced repair — label every connector and hose.

2

Strip the top end for head removal

Remove the intake, exhaust manifold/turbo plumbing as required, valve cover, timing cover/chain or belt components, and any brackets blocking the cylinder head on the 2006-2010 Subaru Forester EJ25. Set the engine to the service TDC position and lock timing if specified.

3

Unbolt and lift the cylinder head

Loosen head bolts in the reverse of the torque sequence on the 2006-2010 Subaru Forester EJ25. Lift the head straight up — it is heavy; use a helper or hoist. Keep bolts in order if they are torque-to-yield and must be replaced.

4

Clean surfaces and check for warpage

Clean block and head gasket surfaces on the 2006-2010 Subaru Forester EJ25 without gouging aluminum. Check the head (and block) for warpage with a straightedge; machine or replace if out of spec. Install dowels if removed.

5

Install the new head gasket and torque the head

Place the new head gasket dry (unless the maker specifies sealant) in the correct orientation on the 2006-2010 Subaru Forester EJ25. Set the head, oil new TTY bolts if required, and torque/angle-tighten in the exact factory sequence and stages.

6

Reassemble timing, refill, and verify

Reinstall timing components, manifolds, covers, and accessories on the 2006-2010 Subaru Forester EJ25. Refill with fresh oil and the correct coolant. Prime the oiling system if specified, start, check for leaks, and verify temperature and misfire-free running. Recheck coolant after heat cycles.

All Done!

Test your repair before closing everything up. If something doesn't work right, double-check your steps.

⚠️ Common Mistakes to Avoid

  • • Not properly torquing head bolts, leading to leaks
  • • Failing to replace timing belt during head gasket replacement
  • • Neglecting to clean mating surfaces thoroughly, causing gasket failure
  • • Overlooking the replacement of valve cover gaskets, leading to oil leaks
  • • Not properly aligning timing marks, resulting in engine misfire