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John, Master A.S.E Automotive technician
Category: Chevy
Satisfied Customers: 9176
Experience:  A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician
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Distributor Timing on a 99 Chevy Blazer. There is two timing

Resolved Question:

Distributor Timing on a 99 Chevy Blazer. There is two timing marks on the vibration damper. Is it the 1st or 2nd mark for top dead center for number one.
Submitted: 5 years ago.
Category: Chevy
Expert:  John replied 5 years ago.

Hello Joseph,

This should help you.

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.

 

 


    Object Number: 301393  Size: SH

  1. Turn OFF the ignition switch.
  2. Remove the engine cover, if equipped.
  3. Remove the spark plug wires from the distributor cap
    Twist each spark plug 1/2 turn.
    Pull only on the boot in order to remove the wire from the distributor cap.
  4. Remove the electrical connector from the base of the distributor.
  5. Remove the two screws that hold the distributor cap to the housing.
  6. Discard the screws.
  7. Remove the distributor cap from the housing.
    Object Number: 4373  Size: SH

  8. Use a grease pencil in order to note the position of the rotor in relation to the distributor housing (1).
  9. Mark the distributor housing and the intake manifold with a grease pencil.
    Object Number: 34397  Size: SH

  10. Remove the mounting clamp hold down bolt.
  11. Remove the distributor.
    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 (2) mark on the base of the distributor.

    This will aid in achieving proper rotor alignment during the distributor installation.

Installation Procedure 1


    Object Number: 4376  Size: SH

  1. If installing a new distributor assembly, place two marks on the new distributor housing in the same location as the two marks on the original housing.
  2. Remove the new distributor cap, if necessary.
  3. Align the rotor with mark made at location (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 in location number (1).
    If the rotor segment is not aligned with the number (1) mark, the driven gear teeth and the camshaft have meshed one or more teeth out of alignment.
    In order to correct this condition, remove the distributor and reinstall it.

    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 distributor clamp bolt to 25 N·m (18 lb ft).


    Object Number: 301393  Size: SH

  9. Install the distributor cap.
  10. Install two 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.

    The wire must not touch anything like the dip stick, rubbing will make a ground/short after time of use.

    Important: If the Malfunction Indicator lamp is turned on after installing the distributor, and a DTC P1345 is found, the distributor has been installed incorrectly.

  14. Refer to Installation Procedure 2 if Malfunction Indicator lamp is turned on after installing the distributor.
  15. Install the engine cover, if equipped.

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 number 1 piston at top dead center (TDC). With the piston on the compression stroke and at top dead center, 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 top dead center of the compression stroke.
    Object Number: 301395  Size: SH

    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.

     

  2. Align white paint mark on the bottom stem of the distributor, and the pre-drilled indent hole in the bottom of the gear (3).
  3. With the gear in this position, the rotor segment should be positioned as shown for a V6 engine (1) or V8 engine (2).
    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 it is installed in the distributor.

    Object Number: 34397  Size: SH

  4. Using a long screw driver, align the oil pump drive shaft to the drive tab of the distributor.
  5. Guide the distributor into the engine.

    Ensure that the spark plug towers are perpendicular to the centerline 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.
    This pointer may have a 6 cast into it, indicating that the distributor is to be used on a 6 cylinder engine or a 8 cast into it, indicating that the distributor is to be used on a 8 cylinder engine.
    If the rotor segment does not come within a few degrees of the pointer, the gear mesh between the distributor and the camshaft may be off a tooth or more.
    If this is the case, repeat the procedure again in order to achieve 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 distributor clamp bolt to 25 N·m (18 lb ft).


    Object Number: 301393  Size: SH

  8. Install the distributor cap.
  9. Install two 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.

    The wire must not touch anything like the dip stick, rubbing will make a ground/short after time of use.

    Important: If the Malfunction Indicator lamp is turned on after installing the distributor, and a DTC P1345 is found, the distributor has been installed incorrectly. Repeat Installation Procedure 2 if Malfunction Indicator lamp is turned on after installing the distributor.

  13. Check the Malfunction Indicator Lamp.
John, Master A.S.E Automotive technician
Category: Chevy
Satisfied Customers: 9176
Experience: A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician
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