3400 upper intake torque sequence - 1999 Chevrolet Venture

I found a forum post on Jeep Enthusiast Forums that provides the tightening sequence for the 3.8L upper intake plenum of a 2007 Chrysler TWC. Here are the steps:

Remove covering on lower intake manifold and clean surfaces.
Inspect manifold gasket condition. Gaskets can be re-used, if not damaged. Position new gasket in seal channel and press lightly in-place. Repeat procedure for each gasket position.
Position upper manifold on lower manifold.

Apply Mopar® Lock & Seal Adhesive (Medium Strength Threadlocker) to each upper intake manifold bolt.
Install and tighten bolts to 12 N·m (105 in. lbs.) using torque sequence.

Here is the torque sequence for the 3.8L upper intake plenum:

6 2 4
5 1 3

Please note that this information is provided as-is and I recommend consulting a professional mechanic for any further assistance.

starting at the middle bolt and go directly across then criss cross the pattern like you would tightening wheel nuts, towards the outside(end) bolts. if this is a plastic upper intake the torque should be around 15ft lbs if its metal around 25ft lbs.

copy and paste
https://www.justanswer.com/ford/2w39p-need-upper-lower-intake-manifold-bolt-torque-specs.html

https://www.justanswer.com/ford/1vuu6-need-lower-intake-torque-specs-2001-ford-windstar.html

I cannot post a picture here because that is copyrighted material. However, the torque sequence is always "start in the center and work your way out to both ends...pretty simple.

The torque specifications are different depending on which engine your Escape is equipped with.

Lower intake torque is done in three steps:
Step 1 27 in. lbs
Step 2 106 in. lbs
Step 3 133 in. lbs
Sequence is:

<- Front of Engine
7 1 3 5


8 4 2 6

Could find no specific sequence for upper intake, but they torque in 2 steps.
Step 1 44 in. lbs
Step 2 89 in. lbs

Hope this helps :)

Lower: Torque to 28 N·m (250 in. lbs.)

Upper: Torque to 12 N·m (105 in. lbs.)

Sequences below:





Good luck.

Fig. Intake manifold bolt torque sequence 2.7L engine

Upper intake manifold with a new gasket on the lower intake manifold and torque the bolts, in sequence, to: 105 inch lbs. (12 Nm)

Hope helps (remember to rate this answer). Good job.

If you are looking at the engine from the front and the large hose is at the bottom right the tightening sequence is from upper left to right 6237 bottom left to right 5148 just like I typed it torque is 250 inch pounds on lower intake and 105 inch pounds on the upper intake. So when you look at those numbers you tighten 12345678 in that order to 250 inch pounds in 3 increments then install the top intake.

3.8L Engine

NOTE The 3.8L (VIN K) non-supercharged engine uses a two-piece intake manifold consisting of an upper air plenum which mounts the throttle body and a lower intake manifold assembly which houses the fuel injectors. The 3.8L (VIN 1) supercharged engine uses a similar lower intake manifold. The supercharger serves as the upper manifold.
Lower Manifold

NOTE Two bolts which fasten the lower intake manifold to the cylinder head are accessible only after the upper intake manifold is removed. These bolts are located in the right front and left rear corners of the lower intake manifold. Remove the upper intake manifold to service the lower intake.
The 3.8L (VIN 1) supercharged engine uses a manifold similar to the 3.8L (VIN K), but the supercharger serves as the upper manifold.

1. Disconnect the negative battery cable.
2. On 3.8L (VIN 1) engines, remove the supercharger assembly. Please see the procedure in this section.
3. Remove the upper intake manifold using the procedure above.
4. Remove the EGR outlet pipe from the intake manifold.
5. Detach the engine coolant temperature sensor wiring harness from the sensor.
6. Remove the lower intake manifold bolts and carefully lift off the manifold.

To install:


Fig. Lower intake manifold bolt torque sequence-3.8L (VIN K) engine

1. Clean all parts well with degreaser, especially the gasket seal surfaces on the upper and lower manifold pieces and between the lower manifold and the cylinder heads..
2. Install new gaskets to the cylinder heads and new seals to the engine block. Carefully lower the manifold into place. Apply thread-locking compound to the bolt threads. Make sure to install the two hidden bolts in the lower intake manifold. Hand start all bolts, then torque evenly to 11 ft. lbs. (15 Nm). Follow the toque sequence, starting in the center, then working outwards in a circle.
3. Install the remaining components in the reverse order of the removal process.

Upper Intake Manifold (Plenum)

1. Disconnect the negative battery cable.
2. On 3.8L (VIN 1) engines, remove the supercharger assembly. Please see the procedure in this section.
3. Tag for identification, then remove the right side spark plug wires.
4. Disconnect the ignition wires from the fuel rail.
5. Remove the fuel rail. Please see Section 5.
6. Remove the cable bracket from the intake manifold.
7. Remove the throttle body.

NOTE Two bolts which fasten the lower intake manifold to the cylinder head are accessible are accessible only after the upper intake manifold is removed. These bolts are located in the right front and left rear corners of the lower intake manifold.

1. Remove the upper intake manifold bolts and carefully lift the upper intake manifold from the engine.

Fig. Upper intake manifold and bolt torque sequence-3.8L (VIN K) engine
To install:

1. Clean all parts well with degreaser, especially the gasket seal surfaces on the upper and lower manifold pieces.
2. Install new gaskets to the cylinder heads and new seals to the engine block. Carefully lower the manifold into place. Make sure to install the two hidden bolts in the lower intake manifold. Hand start all bolts, then torque evenly to 89 inch lbs. (10 Nm). Follow the torque sequence, starting in the center, then working outwards in a circle.
3. Install the remaining components in the reverse order of the removal process.

Hi e-mail me at [email protected] There is a sequence for this. I can e-mail you the picture of the sequence and the tourqe spec.