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Need to know procedure to change valve cover gaskets on 2002 impala

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  • Master
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HI. What engine type are you working on at this time?

3.1L or 3.4L(6cyl)???

Posted on Jul 15, 2010

  • Michael Masters
    Michael Masters Jul 15, 2010

    V6 3.1L

    OK, lets start with the front(left side) valve cover. First; Disconnect the negative battery cable. Next;Drain the engine coolant into a suitable container for re-use, if the coolant is not contaminated. Tag for identification and remove the left side (front) spark plug wires, carefully. Now, Remove the automatic trans axle vacuum modulator pipe. Next; Remove the right engine mount strut through bolt at the engine side and then swing the strut forward out of the way. Now,Remove the PCV valve from the rocker arm cover by pulling the valve from its rubber grommet. Once that is done, Remove the thermostat bypass pipe. Now, Remove the valve cover bolts and remove the cover from the engine. At this point, the gasket will be exposed for replacement. Do not pry it off. Bump the cover sideways with a rubber mallet if it is stuck. Discard the gasket, and replace it with the equivalent.

    Okay, now we can move on to the Right side cover(rear), Start by Remove the accessory drive belt. Then, Remove the alternator and brackets. Next; Remove the rear spark plug wires and place them out of the way. Next; Remove the ignition coil bracket with the coils, the purge solenoid and the vacuum canister solenoid as well. Now, Remove the vacuum hose from the air duct at the rear cylinder head cover. Next; Remove the rocker arm cover bolts and remove the cover from the engine. Do not pry it off. Bump the cover sideways with a rubber mallet if it is stuck, as you have already done during the removal of the previous front cover. Discard the rear valve cover gasket and replace with the equivalent. Remember to torque both the front and rear covers to 89 inch lbs. (10 Nm)


    V6 3.4L

    This will be slightly different from the 3.1L. (front cover) First; Tag for identification and remove the left (front) spark plug wires. Disconnect the negative battery cable. Drain the engine coolant like before. Now, Remove the AIR check valve/pipe. Next; Remove the thermostat bypass hose and pipe.Remove the PCV valve from the rubber grommet in the rocker arm cover. Remove the rocker arm cover bolts and remove the valve cover from the engine. Remember not to pry it off. Bump the cover sideways with a rubber mallet if it is stuck. Discard the gasket. Once you have installed the new gasket on the front side, move on to the rear section. Remove the accessory drive belt. Next, Remove the alternator and the alternator brackets. Now,tag for identification and remove the right side spark plug wires.Also, tag and remove the vacuum hoses from the evaporative canister purge solenoid valve. Next, Remove the evaporative canister purge solenoid valve and the AIR check valve/pipe. Next, Remove the ignition coil bracket with the coils in place. Now, Remove the vacuum hose from the grommet in the right rocker arm cover. Finally, Remove the rocker arm cover bolts and remove the cover from the engine and replace the gasket. Re- torque to 89 inch lbs. (10 Nm).(both covers



  • Michael Masters
    Michael Masters Jul 15, 2010

    V6 3.8(front)

    For the 3.8; Disconnect the negative battery cable. Next; Remove the engine lift bracket from the exhaust manifold studs. Next, Remove the acoustic/cosmetic engine cover. Now, Remove the right side "wish bone" shaped engine strut by removing the through bolts. Tag and remove the left (front) spark plug wires, then, remove the spark plug wire cover retainer clip from the rocker arm cover. Now, Remove the rocker arm cover bolts and remove the cover from the engine. once you have replaced the gasket on the front, re install the cover and move on the the rear cover removal process.

    V6 3.8(rear)

    With the battery still disconnected; Remove the acoustic/cosmetic engine cover. Remove the rear alternator brace. next, Tag and remove the right (rear) spark plug wires. Now, Remove the engine cover retaining bracket from the exhaust manifold studs. Next,Remove the right (rear) engine lift bracket from the exhaust manifold studs. Once that is done, Remove the rocker arm cover bolts and remove the cover from the engine. Do not pry it off. Bump the cover sideways with a rubber mallet if it is stuck. Discard the gasket. The torque specs are the same as stated above.

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