Question about 1999 Chevrolet C1500

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Torque Spec for '99 Chevy C1500 5.7L engine lower intake manifold

I am attempting to replace the lower intake manifold gasket and need to know the torque specification. I have a '99 Chevy C1500 truck w/5.7L engine (old body style).

Thanks!

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  • kuaeatorres Mar 14, 2009

    YOU ROCK LT1ROB! THANK YOU FOR THE QUICK RESPONSE!

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On 5.7L engines, install the bolts and torque in sequence as follows:

  1. Step 1: 71 inch lbs. (8 Nm).
  2. Step 2: 106 inch lbs. (12 Nm).
  3. Step 3: 11 ft. lbs. (15 Nm).
Torque Spec for '99 Chevy C1500 5.7L engine lower  - f2266b6.jpg

Posted on Mar 14, 2009

  • 1 more comment 
  • Rob
    Rob Mar 14, 2009

    No problem, Im always glad to help and thanks for the great feedback!

  • wild wade Sep 23, 2010

    Nice INFO there Rob..you helped a fellow mech. out too..

  • franko1982 Dec 15, 2010

    As lame as it sounds the pic really help thanks

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4022caa.jpg

Fig. Intake manifold bolt torque sequence 2.7L engine

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Torque specification on a 2003 alero cylinder heads 3.4 liter


3.4L Engine To Remove:
  1. Remove the lower intake manifold.
  2. Remove the exhaust crossover pipe.
  3. If removing the right cylinder head, remove the catalytic converter from exhaust manifold.
  4. If removing the left cylinder head, remove the engine oil dipstick and tube.
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  9. Clean the cylinder block bolt threads.
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    Cylinder head torque sequence ’01-05 gm-03-34-682.gif

  4. Install the new cylinder head bolts.
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  8. Raise and support the vehicle.
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Need to replace intake manifold how do you do this


Bonneville, LeSabre, Park Avenue 2000-2005 Intake Manifold - Removal & Installation

3.8L Engine
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  2. Relieve the fuel system pressure.
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  3. Drain the cooling system.
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    a5adffa.jpg
    Fig. Exploded view of the intake manifold and related components-3.8L (VIN K) engine
To install:


140d431.jpg
Fig. Upper intake manifold torque sequence-3.8L (VIN K) engine


4950e4f.jpg
Fig. Lower intake manifold torque sequence-3.8L (VIN K) engine
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2.2L Engine & 2.4L Engines
These engines are not equipped with rocker arms. The camshafts directly actuate the valves.

3.1L Engine & 3.4L Engines
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859cdc3.jpg

Exploded view of the upper and lower intake-3.1L & 3.4L engines


fe92b8b.jpg

Fig. Lower intake manifold tightening sequence-3.1L & 3.4L engines

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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:


0900c15280269f1b.jpg enlarge_icon.gifenlarge_tooltip.gif 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.



0900c15280269f1c.jpg enlarge_icon.gifenlarge_tooltip.gif 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.
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