OEM GMC Sierra 3500 Classic Lash Adjuster

GMC Sierra 3500 Classic Lash Adjuster Parts Questions & Experts Answers

• Valve Lifters
  17122490
  Q: How to replace the Lash Adjuster (LH6, LMG, LY5, and L76) on GMC Sierra 3500 Classic?

  A: The replacement of lash adjusters (LH6, LMG, LY5, and L76) starts with removing the Cylinder Head along with its gasket and continuing to remove the Lash Adjuster guide bolts (211). When removing the Lash Adjuster guides (210) and adjusters maintain track of their initial installation position because the guides have notched alignment with the engine block's locating tab. The first step is to extract lash adjusters (209, 219) from guide (210) while orienting the notched guide area to match the raised adjuster side surface which determines active fuel management adjuster location. Mark or organize the components before their replacement in their original positions followed by necessary cleaning and inspection of lash adjusters. The process requires clean engine oil lubrication of new lash adjusters (209, 219) and engine block valve bores. The reinstallation step involves inserting adjusters into their guides where a flat area on non-active fuel management lash adjusters matches adjuster guide bore flat areas. Notch positions should align with active fuel management adjuster raised surfaces. Install the lash adjusters together with guides (210) onto the engine block and fasten them with Lash Adjuster guide bolts (211) to 12 n.m (106 lb in). Replace the Cylinder Head along with its gasket.