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Discuss 99 Lumina 3.1 Intake gasket replacement procedures in the alt.autos.gm forum at Car Dealer Forums; Can anyone please post or direct me to the procedures for replacing the intake gasket. ...
  1. #1
    Dogg@Datt.s
    Guest

    Default 99 Lumina 3.1 Intake gasket replacement procedures

    Can anyone please post or direct me to the procedures for replacing
    the intake gasket. It's my turn to fix my GM leaking gasket problem.
    I've read as much here as I can about the updated gasket and sealant,
    I'm just wondering about what parts I'll need to remove to get to it.

    99 Lumina 3.1



    › See More: 99 Lumina 3.1 Intake gasket replacement procedures

  2. #2
    Silver Surfer
    Guest

    Default Re: 99 Lumina 3.1 Intake gasket replacement procedures

    Document ID# 339144
    1999 Chevrolet/Geo Lumina
    --------------------------------------------------------------------------------

    Intake Manifold Replacement Upper

    Removal Procedure

    Important
    This engine uses a sequential multiport fuel injection system. Connect the
    injector wiring harness connectors to their appropriate fuel injector or
    exhaust emissions and engine performance may be seriously affected. For the
    correct injector wiring harness connector-to-fuel injector connection
    procedure, refer to Engine Electrical.

    Disconnect the battery ground (negative) cable. Refer to Refer to Battery
    Negative Cable Disconnect/Connect Procedure in Engine Electrical.
    Disconnect the vacuum hose connection from the throttle body air inlet duct.
    Disconnect the wiring harness connection from the intake air temperature
    (IAT) sensor in the throttle body air inlet duct. Refer to Intake Air
    Temperature (IAT) Sensor Replacement in Engine Controls - 3.1L.
    Remove the throttle body air inlet duct.
    Drain the engine coolant from the cooling system. Refer to Draining and
    Filling Cooling System in Engine Cooling.
    Remove the accelerator control and cruise control cables with bracket from
    the throttle body. Remove the wiring harness from the retainer. Refer to
    Accelerator Controls Cable Bracket Replacement in Engine Controls - 3.1L.
    Disconnect the following wiring harness connectors from the throttle body:
    Throttle position (TP) sensor
    Idle air control (IAC) valve
    Disconnect the (left) front spark plug wires. Refer to Spark Plug Wire
    Harness Replacement in Engine Electrical.
    Disconnect the wiring harness attachment clips.
    Camshaft position (CMP) sensor wiring harness
    Left hand spark plug wire harness
    Engine wiring harness
    Remove the nut from the coolant pipe to the throttle body.
    Disconnect the thermostat bypass pipe coolant hoses from the throttle body.
    Refer to HVAC.
    Remove the engine mount struts. Refer to Engine Mount Strut Replacement .
    Rotate the engine forward for access.
    Disconnect the right spark plug wire retaining clips.
    Remove the spark plug wires at the coil pack.
    Remove the ignition coil bracket with the coils, the purge solenoid, the
    vacuum canister solenoid, the vacuum lines, and the electrical connections.
    Refer to Ignition Control Module Replacement and Evaporative Emission (EVAP)
    Canister Purge Valve Replacement in Engine Controls - 3.1L.

    Disconnect the vacuum hose at the manifold air pressure (MAP) sensor and
    upper intake manifold.
    Remove the manifold air pressure (MAP) sensor and the bracket. Refer to
    Manifold Absolute Pressure (MAP) Sensor Replacement in Engine Controls -
    3.1L.

    Disconnect the emission control vacuum harness.
    Disconnect the vacuum hose connections from the upper intake manifold.
    Vacuum booster hose
    Automatic transaxle vacuum modulator hose
    Heater and air conditioning vacuum source hose
    Fuel pressure regulator
    Remove the drive belt. Refer to Drive Belt Replacement .
    Remove the front generator brace. Refer to Generator Brace Replacement in
    Engine Electrical.
    Remove the rear generator brace. Refer to Generator Brace Replacement in
    Engine Electrical.

    Remove the exhaust gas recirculation (EGR) valve. Refer to Exhaust Gas
    Recirculation (EGR) Valve Replacement in Engine Controls - 3.1L.

    Remove the right hand upper intake manifold bolts and studs.

    Remove the left hand upper intake manifold bolts.
    Remove the upper intake manifold.

    Remove the upper intake manifold gasket.

    If replacing the upper intake manifold, remove the throttle body. Refer to
    Throttle Body Assembly Replacement in Engine Controls - 3.1L.

    Clean the seal surfaces on the manifold with degreaser.

    Installation Procedure

    If removed, install the throttle body. Refer to Throttle Body Assembly
    Replacement in Engine Controls - 3.1L.

    Install the upper intake manifold gasket.

    Install the upper intake manifold.
    Loosely install the left hand upper intake manifold bolts.

    Loosely install the right hand upper intake manifold bolts and studs.

    Notice
    Use the correct fastener in the correct location. Replacement fasteners must
    be the correct part number for that application. Fasteners requiring
    replacement or fasteners requiring the use of thread locking compound or
    sealant are identified in the service procedure. Do not use paints,
    lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces
    unless specified. These coatings affect fastener torque and joint clamping
    force and may damage the fastener. Use the correct tightening sequence and
    specifications when installing fasteners in order to avoid damage to parts
    and systems.

    Install the upper intake manifold bolts and studs. Tighten
    Tighten the upper intake manifold bolts and studs to 25 Nm (18 lb ft).

    Install the exhaust gas recirculation (EGR) valve. Refer to Exhaust Gas
    Recirculation (EGR) Valve Replacement in Engine Controls - 3.1L.
    Install the rear generator brace. Refer to Generator Brace Replacement in
    Engine Electrical.
    Install the front generator brace. Refer to Generator Brace Replacement in
    Engine Electrical.
    Connect the vacuum hose connections to the upper intake manifold.
    Vacuum booster hose
    Automatic transaxle vacuum modulator hose
    Heater and air conditioning vacuum source hose
    Fuel pressure regulator

    Connect the emission control vacuum harness.
    Install the manifold air pressure (MAP) sensor and bracket. Refer to
    Manifold Absolute Pressure (MAP) Sensor Replacement in Engine Controls -
    3.1L.

    Connect the vacuum hose at the manifold air pressure (MAP) sensor and the
    upper intake manifold.
    Install the ignition coil bracket with the coils, the purge solenoid, the
    vacuum canister solenoid, the spark plug wire retainers, the plug wires at
    the ignition module, the vacuum lines, and the electrical connections. Refer
    to Ignition Control Module Replacement and Evaporative Emission (EVAP)
    Canister Purge Valve Replacement in Engine Controls - 3.1L.
    Return the engine to the proper position.
    Install the engine mount struts. Refer to Engine Mount Strut Replacement and
    Engine Mount Strut Replacement .
    Connect the thermostat bypass pipe coolant hoses to the throttle body.
    Install coolant pipe nut to throttle body.
    Connect the wiring harness attachment clips.
    Camshaft position (CMP) sensor wiring harness
    Left hand spark plug wire harness
    Engine wiring harness
    Connect the left hand spark plug wires. Refer to Spark Plug Wire Harness
    Replacement in Engine Electrical.
    Connect the wiring harness connectors to the throttle body.
    Throttle position (TP) sensor
    Idle air control (IAC) valve
    Install the accelerator control and cruise control cables with bracket to
    the throttle body. Install the wiring harness to the retainer. Refer to
    Throttle Body Assembly Replacement in Engine Controls - 3.1L.
    Fill the cooling system with engine coolant. Refer to Draining and Filling
    Cooling System in Engine Cooling.
    Install the throttle body air inlet duct.
    Connect the wiring harness connection to the intake air temperature (IAT)
    sensor in the throttle body air inlet duct. Refer to Intake Air Temperature
    (IAT) Sensor Replacement in Engine Controls - 3.1L.
    Connect the vacuum hose connection to the throttle body air inlet duct.
    Connect the battery ground (negative) cable. Refer to Refer to Battery
    Negative Cable Disconnect/Connect Procedure in Engine Electrical.

    --------------------------------------------------------------------------------

    Intake Manifold Replacement Lower
    Removal Procedure

    Important
    This engine uses a sequential multiport fuel injection system. Injector
    wiring harness connectors must be connected to their appropriate fuel
    injector or exhaust emissions and engine performance may be seriously
    affected.

    Disconnect the battery ground (negative) cable. Refer to Battery Negative
    Cable Disconnect/Connect Procedure in Engine Electrical.
    Remove the upper intake manifold. Refer to Intake Manifold Replacement .
    Disconnect the radiator inlet hose from the engine. Refer to Radiator Hose
    Replacement - Inlet in Engine Cooling.

    Disconnect the thermostat bypass hose from the thermostat bypass pipe and
    lower intake manifold pipe.
    Remove the thermostat bypass pipe.
    Remove the left (front) valve rocker arm cover. Refer to Valve Rocker Arm
    Cover Replacement .
    Remove the generator. Refer to Generator Replacement in Engine Electrical.
    Remove the right (rear) valve rocker arm cover. Refer to Valve Rocker Arm
    Cover Replacement .

    Disconnect the engine coolant temperature (ECT) wiring harness.

    Disconnect and remove the fuel injector and manifold air pressure (MAP)
    wiring harness.

    Remove the fuel pipe clip bolt.

    Remove the fuel pipe clip.

    Disconnect the fuel feed pipe from the fuel injector rail. Refer to Fuel
    Hose/Pipes Replacement - Filter to Engine in Engine Controls - 3.1L.

    Disconnect the fuel return pipe from the fuel injector rail. Refer to Fuel
    Hose/Pipes Replacement - Filter to Engine in Engine Controls - 3.1L.

    Remove the fuel injector rail. Refer to Fuel Rail Assembly Replacement in
    Engine Controls - 3.1L.
    Remove the power steering pump from the front engine cover and reposition.
    Refer to Power Steering Pump Replacement in Power Steering System.

    Disconnect the heater inlet pipe with heater hose from the lower intake
    manifold and reposition. Refer to Heater Pipe Replacement - Inlet in HVAC.

    Remove the lower intake manifold bolts.
    Remove the lower intake manifold.
    Remove the valve rocker arms and the push rods. Refer to Valve Rocker Arm
    and Push Rod Replacement .

    Remove the lower intake manifold gaskets and seals.
    Clean the lower intake manifold gasket and seal surfaces on the cylinder
    heads and the engine block.
    Clean the gasket and seal surfaces on the lower intake manifold with
    degreaser.
    Remove all the loose RTV sealer.

    If replacing the lower intake manifold remove the engine coolant temperature
    (ECT) sensor. Refer to Engine Coolant Temperature (ECT) Sensor Replacement
    in Engine Controls - 3.1L.

    If replacing the lower intake manifold remove the water outlet bolts.
    Remove the water outlet.

    If replacing the lower intake manifold remove the thermostat.
    Installation Procedure

    If removed, install the thermostat.

    If removed, install the water outlet.
    Notice
    Refer to Fastener Notice in Cautions and Notices.

    Install the water outlet bolts. Tighten
    Tighten the water outlet bolts to 25 Nm (18 lb ft).

    If removed, install the engine coolant temperature (ECT) sensor. Refer to
    Engine Coolant Temperature (ECT) Sensor Replacement in Engine Controls -
    3.1L.

    Important
    All gasket-mating surfaces need to be free of oil, and foreign material. Use
    GM P/N 12346139 (Canadian P/N 10953463) or equivalent to clean surfaces.

    Install the lower intake manifold gaskets.
    With gaskets in place supply a small drop 8-10 mm (0.31 -0.39 in) of RTV
    Sealer GM P/N 12346141 (Canadian P/N 10953433) or equivalent to the 4
    corners of the intake manifold to block joint (1).
    Connect the 2 small drops with a bead of RTV Sealer that is between 8-10 mm
    (0.30-0.39 in) wide and 3.0-5.0 mm (0.12-0.20 in) thick (2).
    Install the valve rocker arms and pushrods. Refer to Valve Rocker Arm and
    Push Rod Replacement .
    Notice
    Refer to Fastener Notice in Cautions and Notices.

    Important
    All lower intake manifold bolts need to be cleaned, free of any foreign
    material, and reused only if new bolts are unavailable. Use GM P/N 12345382
    (Canadian P/N 10953489) or equivalent and apply to the old intake manifold
    bolt threads.

    Important
    Manufacturer recommends the center bolts be fully torqued before the
    diagonal bolts to assure proper seal ability.

    Important
    Lower intake manifold bolts in location 6 and 7 should be torqued to
    specification using a crows foot type tool.

    Install the lower intake manifold. Install the lower intake manifold bolts.
    Tighten
    Tighten the lower intake manifold bolts in sequence to 7 Nm (62 lb in) on
    the first pass.
    Tighten the lower intake manifold bolts (1,2,3,4) in sequence to 13 Nm (115
    lb in) on the final pass.
    Tighten the lower intake manifold bolts (5,6,7,8) in sequence to 25 Nm (18
    lb ft) on the final pass.

    Install the heater inlet pipe.
    Install the heater inlet pipe nut. Tighten
    Tighten the heater inlet pipe nut to 25 Nm (18 lb ft).

    Install the power steering pump to the front engine cover. Refer to Power
    Steering Pump Replacement in Power Steering System.

    Important
    Do not press on the fuel pressure regulator valve when installing the fuel
    injector rail assembly.

    Install the fuel injector rail assembly.
    Install the fuel injector O-rings using GM P/N 12345616 (Canadian P/N
    993182).
    Install the injector nozzles into the lower intake manifold injector bores.
    Press on the injector rail using the palms of both hands until the injectors
    are fully seated.
    Install the fuel injector rail bolts. Tighten
    Tighten the fuel injector rail bolts to 10 Nm (89 lb in).

    Connect the fuel return pipe to the fuel injector rail. Refer to Fuel
    Hose/Pipes Replacement - Filter to Engine in Engine Controls - 3.1L.

    Connect the fuel feed pipe to the fuel injector rail. Refer to Fuel
    Hose/Pipes Replacement - Filter to Engine in Engine Controls - 3.1L.

    Install the fuel feed and return pipe retaining clip.
    Install the fuel feed and return pipe retaining clip bolt. Tighten
    Tighten the fuel feed and return pipe retaining clip bolt to 8 Nm (71 lb
    in).

    Connect the thermostat bypass hose to the thermostat bypass pipe and lower
    intake manifold pipe.
    Connect the radiator inlet hose to the engine. Refer to Radiator Hose
    Replacement - Inlet in Engine Cooling.

    Install and connect the fuel injector and manifold air pressure (MAP) wiring
    harness.

    Connect the engine coolant temperature (ECT) wiring harness.
    Install the right (rear) valve rocker arm cover. Refer to Valve Rocker Arm
    Cover Replacement .
    Install the generator. Refer to Generator Replacement in Engine Electrical.
    Install the left (front) valve rocker arm cover. Refer to Valve Rocker Arm
    Cover Replacement .
    Install the upper intake manifold. Refer to Intake Manifold Replacement .
    Connect the battery ground (negative) cable. Refer to Battery Negative Cable
    Disconnect/Connect Procedure in Engine Electrical.

    --------------------------------------------------------------------------------
    Document ID# 339149
    1999 Chevrolet/Geo Lumina

    <Dogg@Datt.s> wrote in message
    newse5g3414eab3pnup2vn91posedd6ihduq3@4ax.com...
    > Can anyone please post or direct me to the procedures for replacing
    > the intake gasket. It's my turn to fix my GM leaking gasket problem.
    > I've read as much here as I can about the updated gasket and sealant,
    > I'm just wondering about what parts I'll need to remove to get to it.
    >
    > 99 Lumina 3.1



  3. #3
    Dogg@Datt.s
    Guest

    Default Re: 99 Lumina 3.1 Intake gasket replacement procedures

    Wow! Thanks a million Silver!!!...

  4. #4
    anon@idirect.ca
    Guest

    Default Re: 99 Lumina 3.1 Intake gasket replacement procedures

    Here is the replacement procedure I used on a 2000 Century courtesy of
    Ian aka 'Shiden Kai'
    If you do a search for 'Shiden Kai" you'll come up with a a revised
    procedure where he uses a box wrench to pry on the rockers to remove
    the pushrods without loosening the nuts.
    I loosened the nuts and used a Fel Pro Problem solver gasket and new
    manifold bolts with pre-applied sealer.
    That was 18 months and 20,000kms ago and all is well.

    Thanks again Ian!

    ernie wrote:
    > I have not removed an intake manifold in close to 30 years.
    > I am about 2/3 sure that is the problem I will take it to the dealer
    > Monday and get an estimate and if reasonable let them fix it.
    > I am not sure what reasonable is. Does anyone here know?



    By the time we are done doing the job (we charge 98 dollars
    an hour), it's usually a 750-800 dollar job. The labour
    charge is about 6.0 hrs, but a good tech can easily do it
    in 2.0 hrs. I wrote up a detailed explanation of how to do
    this job a while back. I'll paste it below and you can do with
    it what you want. It should be pretty close to what you will
    encounter with your vehicle. It was written for a van, but the
    procedure is very similiar for your car. There will be some
    difference at the throttle body area and the fuel lines for the
    injector rail go way down under the exhaust. Don't bother
    trying to disconnect any fuel lines, simply remove the nut
    that holds the fuel lines against the rear head and then position
    the injector rain and lines up out of the way and bunjee cord
    it up to the hood. It's too much work to try and disconnect the
    fuel lines and then snake them out under the exhaust crossover
    pipe. You will see what I mean when you get there.

    Ian


    Ok, I'll go over the basic procedure for the van.


    First step would be to drain the coolant. This year, you
    need a 1/4 inch square drive ratchet and preferably a short
    extension. Use the 1/4" ratchet to turn the drain cock
    counter clockwise about an 1/8 of turn, then you have to
    pull the drain cock out while turning it further.


    Next...pull the rubber hood seal off at the front of the
    cowl area...then you can pull off that plastic piece that
    covers the wiper motor area (passenger side of the
    engine compartment.


    Pull the air filter housing and snorkel..usually, I find it
    easier to remove the rubber section first, and then you
    have more room to remove the air filter cover and air
    filter. There are a couple of electrical connections on
    the snorkel and the MAF sensor, unplug them...and then
    follow that wire harness back and unplug everything else
    on it, except where it plugs into the coil pack ( oh yeah,
    I'm going to give you the "faster" version). So you should
    have a couple more sensors at the throttle body, a red
    connector at the evap solenoid and then a harness clip
    at the coil pack. You can position this harness back over
    the coil pack. Remove the front three spark plug wires at
    the coil pack. Unhook all the clips that hold those wires
    to the engine, but don't bother to take the wires off the front
    plugs, just lay the wires over the front of the rad support.
    Remove the vacuum booster hose at the upper plenum.


    Remove the two bolts that secure the coil pack bracket
    to the upper intake plenum (10 mm head). Now you want
    to remove the MAP sensor which sits bolted to a small
    bracket on the upper plenum right in front of the coil
    pack. You will need a 7 mm socket or wrench to undo
    the two long screws that hold it in place. Then unhook
    the vacuum lines and the electrical connector and lay
    the sensor and vacuum lines somewhere. Now you
    can remove the upper plenum bolts. At the passenger
    rear side of the upper plenum, there is a small brace that
    goes from the alternator to one of the bolts in the upper
    plenum. Get that brace off and then you can take that
    one plenum bolt out.


    Now go to the back of the engine, you need to find
    the EGR pipe that comes up to the upper plenum and
    EGR valve. The temptation is to remove the valve, but
    don't bother. Just remove the bolt that holds the flexible
    pipe to the upper plenum. There is also a small nut that
    holds the Transmission filler tube to a stud on the upper
    plenum. You need to remove that and push the filler
    tube off that stud. There is also one nut at the throttle
    body that holds a coolant pipe in place, remove that and
    disconnect the two small throttle body coolant hoses at
    the back of the engine there. At this point you should be
    able to remove the upper plenum. Do "not" bend the
    coil pack bracket up to give yourself clearance. This makes
    it very difficult to start those bolts properly later on. Just
    slide the upper plenum out from underneath it. You may
    notice that I said nothing about the cables to the throttle body.
    I do not disconnect them, just leave them on the plenum and
    flip the plenum upside down and off to the side. It will just
    sit there.


    Next, you need to remove the fuel rail and injectors. There are
    two 10mm head bolts that hold the rail to the lower intake, and
    one that holds the fuel lines to a bracket at the rear of the rear
    head. Remove all three, carefully pry/pull the fuel injectors and
    rail out of the holes. Take a close look at the injectors once
    you have them out, any o-rings that have come off need to
    be retrieved from the intake manifold area. Sometimes they
    will just be loose, other times, they are stuck in the injector
    holes. Again, I don't disconnect the fuel lines, just position the
    rail and lines off to the side somewhere.


    There is a heater pipe that goes into the lower intake at the
    rear of the engine. You need to simply loosen the nut that
    holds it to a stud at the rear of the rear head, and then
    you can pull the pipe out of the intake. Note: replace
    that o-ring seal.


    There is also a heater pipe and bypass pipe assembly
    that runs along the front of the front valve cover. That
    is the same pipe that had the two small throttle body hoses
    connected to it. Remove it, and either move it off to the
    side, or disconnect the "quick connect" fitting (sometimes
    they aren't all the "quick" and so I just leave them).


    Now you can remove the front valve cover, if you need
    room to get at the one bolt, remove the left engine strut
    and you can get a run at the bolt. Then loosen the two
    rear valve cover bolts that you can see. One will be
    under the alternator, the other is under the coil pack.
    In both cases, there is just enough room to completely
    loosen the two bolts.


    Now you have to deal with the power steering pump.
    Remove the small plastic shield that sits right above
    the water pump pulley (this just give you a little more
    clearance for the ps pump pulley). Now, remove
    the serpentine belt. Then remove the three bolts
    that hold the pump to the engine, you can access
    them thru the bolts in the pulley. They are 13 mm
    bolts. Now, you must loosen the ps pressure hose
    fitting at the pump. Use a 5/8 wrench and just
    loosen it until the hose will be able to move. In other
    words, don't completely remove the hose. Now, reach
    your hand down the two ps hoses and you will find some
    plastic clips that the hoses are in. Pop the Pressure
    hose (left one as you look down at the two hoses) out
    of the plastic clip. Now, you should be able to pull
    the pump up and lay it down between the front of
    the engine and windshield washer bottle. You may
    need to fiddle with the rubber return hose, as there
    is a bracket in it's way, you can move the hose around
    the bracket.


    At this point, remove the lower intake bolts (8 of them)
    and the upper rad hose from the lower intake. The intake
    should now slide out from under the rear valve cover. Trust
    me, it comes out. Now you have to loosen the rockers
    arms enough so that you can get the push rods out. The rear
    rocker arm bolts can be reached, even though the rear valve
    cover is in place. Just loosen each rocker arm just enough
    to be able to remove the push rods. Keep them in order,
    as it's important that you don't mix them up.


    Clean up your gasket surfaces..etc. Then install
    your intake gaskets to the head first, then the push rods.
    Short pushrods to the intake valves, long to the exhaust
    valves. Be meticulous about cleaning the front and
    rear surfaces of the block and the intake manifold, as
    this is where the RTV sealer goes. Also clean the joint
    between the rear valve cover and the cylinder head and
    where the intake manifold will meet the two of them. Do
    not mess with the rear valve cover gasket, just make sure
    it stays up in it's groove. Before you install the intake, make
    sure you have a nice bead of RTV on the front and rear mating
    surfaces, and put a dab of RTV in that corner where the rear
    v/c and head and intake will meet. From there, it's pretty
    well just the reverse of the removal procedure. Don't bother
    trying to tighten those two rear valve cover bolts until you have
    torqued down the intake manifold. Then they will just slide
    right in. Also, when you install the upper plenum, you are
    going to slide it back under the coil pack, and then engage
    the EGR pipe and the throttle body coolant hoses. Take your
    time here, and make sure everything is where it should be
    before tightening down the intake bolts.


    Hope this helps, and all goes well. The procedure for the
    Century will be almost identical, other then the Trans dipstick
    tube.


    Ian
    http://groups.google.ca/group/alt.au...a382509e3f7aaf


    GM

    Coolant and/or oil leaks. GM reports that many of its 1999-2003 mid-
    size cars and minivans with the 3.1 or 3.4L V6 (VINs J, E) are
    susceptible to springing oil and/or coolant leaks at the lower intake
    manifold gasket. The complaints you're likely to get irom customers
    can vary from oily spots on the driveway to continually having to top
    up the coolant reservoir with antifreeze. The Low Coolant light on the
    dash could also illuminate. A new-design
    intake gasket with superior sealing qualities (Part No. 89017279) is
    now available to eliminate both leakage issues.

    GM says you must install upgraded manifold bolts with preapplied
    threadlocker (Part No. 11588915, short bolts; Part No. 11588914, long
    bolts) to get the benefits of the new gaskets sealing qualities. New
    torque specs and a new tightening sequence for the bolts are also on
    the menu (see illustration).

    Here's the info you'll need to do the job: Begin by tightening the
    four vertical (inner) bolts to 62 in.-lbs. Follow that up by
    tightening the four diagonal (outer) bolts to the same 62 in.-lbs. Now
    go back to the vertical bolts and torque them to 115 in.-lbs. Complete
    the tightening sequence by torquing the diagonal bolts to 18 ft.-lbs.
    GM cautions that if you don't use the new torque specs in the exact
    sequence indicated, you could be opening yourself up to a comeback.

  5. #5
    Dogg@Datt.s
    Guest

    Default Re: 99 Lumina 3.1 Intake gasket replacement procedures

    Thanks also, anon...

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