OEM GMC Envoy Timing Chain Tensioner

GMC Envoy Timing Chain Tensioner Parts Questions & Experts Answers

• Tensioner
  12598504
  Q: How to replace the timing chain tensioner on GMC Envoy?

  A: A successful Timing Chain tensioner replacement requires the use of the camshaft holding tool (J 44221) among other necessary tools. First remove both the camshaft cover and engine front cover from the assembly. Rotate the Crankshaft clockwise until the #1 Piston reaches top dead center (TDC) on the compression stroke, ensuring the word delphi on the exhaust camshaft position actuator is parallel with the Cylinder Head to cam cover mating surface. Set the camshaft holding tool (J 44221) in position behind the camshafts. Use the timing marks as indicators to mark the Timing Chain links where they are positioned near the exhaust camshaft position actuator sprocket and both intake and Crankshaft sprockets. Turn the tensioner shoe inside out to gain Timing Chain tension control then use a tee attachment to keep the shoe in position. Begin by removing the engine's Timing Chain tensioner bolts before taking out the tensioner itself. To complete installation insert the Timing Chain tensioner into its engine position and fasten the tensioner bolts to 25 nm (18 ft. Lbs.). Reinstall the tee from the Timing Chain tensioner for chain tension restoration then remove the camshaft holding tool (J 44221) from the camshafts. Line up the marked Timing Chain segments with position markers on both the exhaust camshaft position actuator sprocket and intake camshaft sprocket and Crankshaft sprocket. Place the engine front cover followed by the camshaft cover during the installation process.