Core Plug Replacement

All core plugs

1. NOTE: Cylinder block core plug shown, cylinder head core plug similar.

Use the Slide Hammer and a freeze plug remover to remove the core plug.

2. NOTE: Oversize plugs are identified by the OS stamped in the flat located on the cup side of the plug.

Inspect the core plug bore for any damage that would interfere with the correct sealing of the plug. If the core plug bore is damaged, bore for the next oversize plug.

Cup-type

3. NOTICE: Use care during this procedure so as not to disturb or distort the cup sealing surface.

NOTE: When installed, the flanged edge must be below the chamfered edge of the bore to effectively seal the bore.

Coat the cup-type core plug and bore lightly with sealant and install the core plug using a freeze plug installer.

Expansion-type

4. NOTICE: Do not contact the crown when installing an expansion-type core plug. This could expand the plug before seating and result in leakage.

Coat the expansion-type core plug and bore lightly with sealant and install the core plug using a freeze plug installer.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Core Plug Replacement

Use the Manual With the Right Hardware

When to See a Mechanic

Rather have a pro handle this?