How to Replace Valve Cover and Gasket 02-06 Nissan Altima L4 2.5L

Difficulty: Intermediate · About 60 min · Nissan Altima

Replace the valve cover and gasket on a Nissan Altima 2.5L, protecting exposed engine openings and applying sealant only at the specified joints.

Steps

1. Remove the engine cover and coils

   Let the engine cool, remove the engine cover, unplug each ignition coil, and take out its retaining bolt. Lift the coils away and label their positions if needed.

2. Remove the valve cover

   Move the harness retainer, disconnect the PCV and breather hoses, and remove the cover bolts in the specified sequence. Lift the cover gently and protect open engine areas with clean lint-free material.

3. Prepare the sealing surfaces

   Remove the old gasket and any sealant without gouging the aluminum. Clean the mating surfaces and bolt wells, then install the new gasket in its channel.

4. Seal and reinstall the cover

   Apply a small bead of RTV only at the joints specified by the service manual. Remove all protective material, position the cover, and tighten its bolts in the correct sequence and specification.

5. Reconnect hoses and ignition coils

   Reconnect the PCV and breather hoses and secure the harness. Reinstall each coil and its fastener, reconnect the plugs, and refit the engine cover.

6. Check for leaks

   Start the engine and inspect the perimeter for oil seepage. Shut it off if a leak appears, let it cool, and correct the seal before driving.

Check your vehicle’s repair manual for exact specifications and fit.