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3.0L Engine - Intake Manifold Prolem

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  • 3.0L Engine - Intake Manifold Prolem

    I am currently replacing the heads on my NG paj and i'm having great difficulty removing the intake manifold. Ive taken off the seven nuts that hold it down but it seems that there is another stud on the passenger side on the heater inlet that seems to be holding the manifold down. The manual ive got doesnt give me any clues or show me any extra bolts holding it down. The engine is 3.0l v6. The front lifts up a bit but there is something holding it down towards the rear. The only thing that I can think is that the threaded stud shown in the pics below goes down to the head but the manual I have doesnt show it. It almost seems like this is the last thing holding the manifold on, but ive removed the nut from it and I still remove the manifold. Ive included some pics below. Can somebody help me by telling me how to remove the manifold.
    Attached Files

  • #2
    Should lift off.. Lift it evenly up and should come off or have you lubes it with wd50 or something?

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    • #3
      Should come off. There is 8 nuts holding it on. There's a hose at the back that gets in the way and makes it hard to get manifold off and on.

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      • #4
        The gasket is probably what's holding it down. So, after soaking around the studs with WD40, using a length of hardwood & a hammer, gently tap the manifold from each side to loosen, then lift.

        Steve

        Note; NH has only 2 studs at the ends, the rest are bolts; probably because gasket-goo binds around the studs making it really hard to remove manifold. May be worth replacing the studs with high-tensile bolts when you reassemble.
        Last edited by Stevie-Ray; 22-05-11, 11:54 AM. Reason: add note
        Steve

        Runner-Paj; '95 NJ SWB 2.5L TD GL J-Top, low kms Project-Paj; '92 NH SWB 3.0L V6 GLS Hardtop Triple-pack, also low kms. Donor Paj; '92 NH SWB 3.0L V6 GLS Hardtop Triple-pack, with some parts & goodies to go onto other GLS.
        "I try to take life one day at a time, but sometimes several days attack me all at once!"

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        • #5
          I managed to get it off this afternoon. It was just severe corrosion around the thread that I circled.

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          • #6
            How did the motor look after you got the top off?

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            • #7
              3.0L engine - intake manifold problem

              Originally posted by ngwagon View Post
              How did the motor look after you got the top off?
              I honestly cant see the point in struggleing in taking the inlet manifold off while its still attached to the head, as its much easier to take it apart once you have it on the floor/bench, same goes for the exhaust one too, just dissconnect from the down pipe, makes it much easier to lift the heads off too, especially if they are on the stubbon side, the heads I mean.

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              • #8
                Originally posted by scorpion 42 View Post
                I honestly cant see the point in struggleing in taking the inlet manifold off while its still attached to the head, as its much easier to take it apart once you have it on the floor/bench, same goes for the exhaust one too, just dissconnect from the down pipe, makes it much easier to lift the heads off too, especially if they are on the stubbon side, the heads I mean.
                sorry mate i think you must have miss under stood it's a v6 not the 2.6 you can't remove the heads (2 of them) with intake manifold in place like on the 4cyl (1 head) that is why he posted question
                94 NJ Paj LWB 5spd, 2in king springs,torsion bars wound up & droop stops trimmed, alloy bullbar & side steps,full length steel roof rack ,Rally 1000's, 170 night stalkers h/light upgrade h4 replacement globes 55/100, rear work lights, Sony head unit, Uniden 40ch UHF, GME 80ch UHF, 27mhz AM SSB CB, 33' BFG a/t's on 15' 60ser L/Cruiser chrome rims, Snorkel rebuilt motor g/box & rear diff with auto lokka lot more to come

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                • #9
                  Originally posted by ngwagon View Post
                  How did the motor look after you got the top off?
                  It looked pretty good for a 21 year old motor! Just a bit of corrosion around the threads and the usual gunk around the edge of the gaskets. My dad dropped the heads off to the engineers this morning so hopefully they can clean them up and don't ring back with any surprises.

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                  • #10
                    Originally posted by scorpion 42 View Post
                    I honestly cant see the point in struggleing in taking the inlet manifold off while its still attached to the head, as its much easier to take it apart once you have it on the floor/bench, same goes for the exhaust one too, just dissconnect from the down pipe, makes it much easier to lift the heads off too, especially if they are on the stubbon side, the heads I mean.
                    I don't see why you would need to hoist the engine out to remove the heads? I don't have a hoist but I just removed the components of the engine in a logical order. The only reason I was having difficulties was because of the corrosion, once I got it loose it came out easy. The exhaust manifolds were also pretty easy, just got under the car and used the right socket extension bar thingy and they pulled off no problem. This is the first time Ive ever done anything on a car other than change the oil or change a flat tyre.

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                    • #11
                      Originally posted by Wizard1990 View Post
                      I don't see why you would need to hoist the engine out to remove the heads? I don't have a hoist but I just removed the components of the engine in a logical order. The only reason I was having difficulties was because of the corrosion, once I got it loose it came out easy. The exhaust manifolds were also pretty easy, just got under the car and used the right socket extension bar thingy and they pulled off no problem. This is the first time Ive ever done anything on a car other than change the oil or change a flat tyre.
                      it looks like you have done well mate and it is quite common for them to get caught up on the studs especially if the washers are missing my comment was referring to the other person's comment on take the manifolds off after removing the heads this is only possible on 4cyl or strait 6cyl not on the v6 or v8 it was quite obvious to me that they had no idea what they were taking about and no i wouldn't remove the engine just to do the heads i hope all is going well mate with the job ok
                      94 NJ Paj LWB 5spd, 2in king springs,torsion bars wound up & droop stops trimmed, alloy bullbar & side steps,full length steel roof rack ,Rally 1000's, 170 night stalkers h/light upgrade h4 replacement globes 55/100, rear work lights, Sony head unit, Uniden 40ch UHF, GME 80ch UHF, 27mhz AM SSB CB, 33' BFG a/t's on 15' 60ser L/Cruiser chrome rims, Snorkel rebuilt motor g/box & rear diff with auto lokka lot more to come

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