Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2006 Mercury Mariner 4WD V6-3.0L VIN 1FACTORY OEM SERVICE PROCEDURE
Cylinder Block - Core Plug Replacement
Cylinder Block Core Plug Replacement
1. Use a slide hammer or tools suitable to remove the cylinder block core plug.
2. Inspect the cylinder block plug bore for any damage that would interfere with the correct sealing of the plug. If the cylinder block plug bore is damaged, bore for the next oversize plug.
3. NOTE: Oversize plugs are identified by the OS stamped in the flat located on the cup side of the plug.
Coat the cylinder block core plug and bore lightly with Threadlock 262 and install the cylinder block core plug.
Cup-Type
1. CAUTION: Use care during this procedure so as not to disturb or distort the cup sealing surface.
CAUTION: When installed, the flanged edge must be below the chamfered edge of the bore to effectively seal the bore.
Use a tool suitable to seat the cup-type cylinder block core plug.
Expansion-Type
1. CAUTION: Do not contact the crown when installing an expansion-type cylinder block core plug. This could expand the plug before seating and result in leakage.
Use tool suitable to seat the expansion-type cylinder block core plug.
Special Tool(s):
Material:
1. Use a slide hammer or tools suitable to remove the cylinder block core plug.
2. Inspect the cylinder block plug bore for any damage that would interfere with the correct sealing of the plug. If the cylinder block plug bore is damaged, bore for the next oversize plug.
3. NOTE: Oversize plugs are identified by the OS stamped in the flat located on the cup side of the plug.
Coat the cylinder block core plug and bore lightly with Threadlock 262 and install the cylinder block core plug.
Cup-Type
1. CAUTION: Use care during this procedure so as not to disturb or distort the cup sealing surface.
CAUTION: When installed, the flanged edge must be below the chamfered edge of the bore to effectively seal the bore.
Use a tool suitable to seat the cup-type cylinder block core plug.
Expansion-Type
1. CAUTION: Do not contact the crown when installing an expansion-type cylinder block core plug. This could expand the plug before seating and result in leakage.
Use tool suitable to seat the expansion-type cylinder block core plug.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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