GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2004 🢒 Sonoma Pickup - 2WD 🢒 Engine 🢒 Engine Mechanical - 4.3L 🢒 Camshaft Replacement

Removal Procedure

    Object Number: 9847 Size: SH
  1. Remove the timing chain and the camshaft sprocket. Refer to Camshaft Timing Chain, Sprocket, and Tensioner Replacement .
  2. Remove the valve lifters. Refer to Valve Lifter Replacement .
  3. Remove the balance shaft drive gear.

    4. Object Number: 188030 Size: SH
  4. Remove the camshaft retainer bolts and retainer.

    5. Object Number: 5147 Size: SH

    Notice: All camshaft journals are the same diameter, so care must be used in removing or installing the camshaft to avoid damage to the camshaft bearings.

  5. Remove the engine camshaft.
    6. 5.1. Install the three 5/16-18 x 4.0 inch bolts into the engine camshaft front bolt holes.
    5.2. Using the bolts as a handle, carefully rotate and pull the engine camshaft out of the camshaft bearings.
    5.3. Remove the bolts from the front of the engine camshaft.
    5.4. Clean and inspect the camshaft and the bearings. Refer to Camshaft and Bearings Cleaning and Inspection .

Installation Procedure

    Object Number: 5147 Size: SH

    Important: Whenever a new camshaft is installed, do the following procedures:

       • Change the engine oil.
       • Change the engine oil filter.
       • Add GM Engine Oil Supplement GM P/N 1052367 (Canadian P/N 992869) or the equivalent to the engine oil.

  1. Apply clean engine oil GM P/N 12345610 (Canadian P/N 993193) or equivalent, or engine oil supplement GM P/N 1052367 (Canadian P/N 992869) or equivalent to the following components:
    2. • The engine camshaft lobes
    • The camshaft bearing journals
    • The camshaft bearings
  2. Install three 5/16-18 x 4.0 inch bolts into the engine camshaft front bolt holes.

    3. Notice: All camshaft journals are the same diameter, so care must be used in removing or installing the camshaft to avoid damage to the camshaft bearings.

  3. Use the bolts as a handle in order to install the engine camshaft.
  4. Remove the 3 bolts from the front of the engine camshaft.

    5. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 188030 Size: SH
  5. If reusing the fasteners, apply threadlock GM P/N 12345382 (Canadian P/N 10953489) or equivalent to the threads of the camshaft retainer bolts.
  6. Install the camshaft retainer and bolts.

    7. Tighten
    Tighten the camshaft retainer bolts to 12 N·m (106 lb in).

  7. Install the balance shaft drive gear. Refer to Balance Shaft Installation for alignment of the balance shaft drive gear and the driven gear.
  8. Install the valve lifters. Refer to Valve Lifter Replacement .
  9. Install the timing chain and camshaft sprocket. Refer to Camshaft Timing Chain, Sprocket, and Tensioner Replacement .