OEM 2005 Chevrolet Trailblazer Rocker Arm

2005 Chevrolet Trailblazer Parts Questions & Experts Answers

• Q: How to replace the valve rocker arm and valve lash adjuster on 2005 Chevrolet Trailblazer?

  A: You must start valve Rocker Arm and valve Lash Adjuster replacement by taking out the Camshaft cover and exhaust and intake sprocket bolts first. Use the Camshaft sprocket holding tool (J 44222) on the Cylinder Head by securing horizontal bolts through the Camshaft sprockets to secure chain tension thus protecting the timing chain elements. The sprockets with timing chain need removal from the camshafts while you carefully move them before you remove the Camshaft cap bolts. Keep the Camshaft caps in a rack for later correct installation. After the Camshaft caps must be removed along with camshafts and valve rocker arms and valve lash adjusters which need to be placed in proper order for future reinstallation. Before returning the valve lash adjusters to their original spots the technician must apply engine oil inside them then fill them with the same oil. Add engine oil to both the valve Rocker Arm roller and valve rocker arms then implement the rollers before treating Camshaft journals with lubrication. You should reinstall both camshafts and Camshaft caps by tightening the Camshaft cap bolts up to 12 nm which equals 106 inch lbs. Place each Camshaft sprocket onto its Camshaft after taking off the Camshaft sprocket holding tool (J 44222). The intake Camshaft sprocket washer and bolt join the exhaust Camshaft actuator bolt in installation and require the intake Camshaft sprocket bolt to reach a torque of 20 nm (15 ft. Lbs.) through a first-stage tightening followed by 100-degree tightening with the torque angle meter (J 36660-A). The exhaust Camshaft actuator bolt requires two-stage tightening to a torque of 25 nm (18 ft. Lbs.). The torque angle meter should be used for the final tightening of the exhaust Camshaft actuator bolt which requires a total 135 degrees of rotation after an initial pass of 25 nm (18 ft. Lbs.). Finally, install the Camshaft cover.