OEM GMC Envoy Rocker Shaft Spring Kit

GMC Envoy Rocker Shaft Spring Kit Parts Questions & Experts Answers

• Valve Springs
  12596078
  Q: How to replace the Rocker Shaft Spring Kit and valve stem oil seal on GMC Envoy?

  A: Get the tools needed to change the Valve Stem Oil Seal and valve springs: j 38820 (Valve Stem Seal Remover and Installer), j 44222 (Camshaft Sprocket Holding Tool), and j 44228 (Valve Spring Compressor). Start by taking off the cam cover, Spark Plugs, exhaust, and intake sprocket bolts. Mount the j 44222 on the Cylinder Head such that the timing chain parts are not disturbed to align the two horizontal bolts to the Camshaft sprockets in order to keep chains in a tense state. Carefully move the sprockets, timing-chain off the camshafts, removing the Camshaft cap bolts and Camshaft caps in a rack for reinstallation. Next, remove Camshaft caps and camshfts, apply air pressure to the cylinder using a convenient adapter and then install the j 44228 in order to compress the valve. The valve keys and the j 44228 are removed, then the valve spring retainer and the valve. Use j 38820 to break the seals, clean and check the Cylinder Head. For the installation, lubricate valve stems using clean engine oil, j 38820 for valve seals installation and the valve spring and retainer will be installed. Compress the valve springs using the j 44228, valve keys, and then remove j 44228. Let out the air pressure in the cylinder, apply clean engine oil to the Camshaft journals, thrust face and to the Camshaft lobes and place the camshafts back into their original positions. Tighten the Camshaft cap bolts to 12 nm (106 inch lb.) while repositioning the Camshaft sprockets onto the camshafts and pull out the j 44222. Install the intake cam shaft sprocket washer bolt and exhaust cam shaft actuator bolt and tighten the intake cam shaft sprocket bolt to 20 nm (15 ft. Lbs. ) on the first pass and then the final pass tighten it an additional 100 degs. With the j 36660 a. Tighten the exhaust Camshaft actuator bolt to 25 nm (18 ft. Lbs) in the first, and 135° further in the final, using j 36660-a. Finally, fit the spark plugs and cam shaft cover.