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Bob
Bob, Auto Tech
Category: Chevy
Satisfied Customers: 4087
Experience:  Plus 40 years GM, over 30 certified with Chevrolet, ASE certified Master Tech. (Expired, Retired)
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top dead center..new destibuter in and dont want to use screwdriver

Customer Question

need to know were top dead center is putting a new destibuter in and don't want to use screwdriver in the number 1 hole
Submitted: 7 years ago.
Category: Chevy
Expert:  Bob replied 7 years ago.

Timing on your truck is set with a scan tool, not a timing light. Distributor procedure below.

Document ID# XXXXX
2003 Chevrolet Astro - 4WD

 

Distributor Replacement

Removal Procedure

Notice: There are two procedures available to install the distributor.Use Installation Procedure 1 when the crankshaft has NOT been rotated from the original position.Use Installation Procedure 2 when any of the following components are removed:

The intake manifold
The cylinder head
The camshaft
The timing chain or sprockets
The complete engine
If the malfunction indicator lamp (MIL) turns on and DTC P1345 sets after installing the distributor, this indicates an incorrectly installed distributor.Engine damage or distributor damage may occur. Use Procedure 2 in order to install the distributor.

 

  1. Turn OFF the ignition.
  2. Remove the engine cover.
  3. Remove air cleaner assembly.
  4. Remove the air intake resonator assembly.
  5. Remove the spark plug wires from the distributor cap.
    - Twist each spark plug wire 1/2 turn.
    - Pull only on the wire boot in order to remove the wire from the distributor cap.
  6. Remove the electrical connector from the base of the distributor.
    Object Number: 301393  Size: SH

  7. Remove the 2 screws that retain the distributor cap to the housing.
  8. Discard the screws.
  9. Remove the distributor cap from the housing.
    Object Number: 4373  Size: SH

  10. Use a grease pencil in order to mark the position of the rotor in relation to the distributor housing (1).
  11. Mark the distributor housing and the intake manifold with the grease pencil.
    Object Number: 4376  Size: SH

  12. As the distributor is being removed from the engine, watch the rotor move in a counter-clockwise direction about 42 degrees. This will appear as slightly more than one clock position.
  13. Note the position of the rotor segment.
  14. Place a second mark on the base of the distributor (2). This will aid in achieving the proper rotor alignment during the distributor installation.
    Object Number: 34397  Size: SH

  15. Remove the mounting clamp hold-down bolt.
  16. Remove the distributor.

Installation Procedure 1


    Object Number: 4376  Size: SH

  1. If installing a new distributor assembly, place 2 marks on the new distributor housing in the same location as the marks on the original housing.
  2. Remove the new distributor cap, if necessary.
  3. Align the rotor with the second mark (2).
    Object Number: 34397  Size: SH

  4. Guide the distributor into the engine.
  5. Align the hole in the distributor hold-down base over the mounting hole in the intake manifold.
    Object Number: 4373  Size: SH

  6. As the distributor is being installed, observe the rotor moving in a clockwise direction about 42 degrees.
  7. Once the distributor is completely seated, the rotor segment should be aligned with the mark on the distributor base (1).
    - If the rotor segment is not aligned with the mark, the driven gear teeth and the camshaft have meshed one or more teeth out of alignment.
    - In order to correct this condition, remove and reinstall the distributor.

    Object Number: 366609  Size: SH

    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.

  8. Install the distributor mounting clamp bolt.

    Tighten
    Tighten the bolt to 25 N·m (18 lb ft).


    Object Number: 301393  Size: SH

  9. Install the distributor cap.
  10. Install the new distributor cap screws.

    Tighten
    Tighten the screws to 2.4 N·m (21 lb in).

  11. Install the electrical connector to the distributor.
  12. Install the spark plug wires to the distributor cap.
    Object Number: 387772  Size: SH

  13. Install the ignition coil wire. Note the correct orientation of the wire boot.

    Important: If the malfunction indicator lamp illuminates after installing the distributor and DTC P1345 is set, the distributor has been installed incorrectly.

  14. Refer to Installation Procedure 2 if the malfunction indicator lamp illuminates after installing the distributor.
  15. Install the engine cover.

Installation Procedure 2


    Object Number: 334551  Size: SH

    Important: Rotate the number 1 cylinder to top dead center (TDC) of the compression stroke. The engine front cover has 2 alignment tabs and the crankshaft balancer has 2 alignment marks spaced 90 degrees apart which are used for positioning the number 1 piston at TDC. With the piston on the compression stroke and at TDC, the crankshaft balancer alignment mark (1) must align with the engine front cover tab (2) and the crankshaft balancer alignment mark (4) must align with the engine front cover tab (3).

  1. Rotate the crankshaft balancer clockwise until the alignment marks on the crankshaft balancer are aligned with the tabs on the engine front cover and the number 1 piston is at TDC of the compression stroke.
    Object Number: 301395  Size: SH

  2. Align the white paint mark on the bottom stem of the distributor and the pre-drilled indent hole in the bottom of the gear (3).

    Notice: The ignition system distributor driven gear and rotor may be installed in multiple positions. In order to avoid mistakes, mark the distributor on the following components in order to ensure the same mounting position upon reassembly:

    The distributor driven gear
    The distributor shaft
    The rotor holes
    Installing the driven gear 180 degrees out of alignment, or locating the rotor in the wrong holes, will cause a no-start condition. Premature engine wear or damage may result.

     

  3. With the gear in this position, the rotor segment should be positioned as shown for a V6 engine (1).
    - The alignment will not be exact.
    - If the driven gear is installed incorrectly, the dimple will be approximately 180 degrees opposite of the rotor segment when installed in the distributor.

    Object Number: 34397  Size: SH

  4. Use a long screw driver in order to align the oil pump drive shaft to the drive tab of the distributor.
  5. Guide the distributor into the engine. Ensure the flat portion of the distributor housing is facing toward the front of the engine.
    Object Number: 4350  Size: SH

  6. Once the distributor is fully seated, the rotor segment should be aligned with the pointer cast into the distributor base. If the rotor segment does not come within a few degrees of the pointer, repeat the procedure in order to achieve the proper alignment.
    Object Number: 366609  Size: SH

    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.

  7. Install the distributor mounting clamp bolt.

    Tighten
    Tighten the bolt to 25 N·m (18 lb ft).


    Object Number: 301393  Size: SH

  8. Install the distributor cap.
  9. Install the new distributor cap screws.

    Tighten
    Tighten the screws to 2.4 N·m (21 lb in).

  10. Install the electrical connector to the distributor.
  11. Install the spark plug wires to the distributor cap.
    Object Number: 387772  Size: SH

  12. Install the ignition coil wire. Note the correct orientation of the wire boot.

    Important: If the malfunction indicator lamp illuminates after installing the distributor and DTC P1345 is set, the distributor has been installed incorrectly.

  13. Repeat Installation Procedure 2 if the malfunction indicator lamp illuminates after installing the distributor.
  14. Install the engine cover.

Document ID# XXXXX
2003 Chevrolet Astro - 4WD

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