OEM GMC Envoy Valve Stem Oil Seal

GMC Envoy Valve Stem Oil Seal Parts and Q&A

• Valve Seals
  12482063
  Q: How to service and repair the valve guide seal, replace the valve stem oil seal, and valve spring on GMC Envoy?

  A:

  Before starting Valve Stem Oil Seal repairs you need four special tools (J 38820, J 44222, J-44228-A, J 44226). First move all valve train parts to a specific location to get them back together correctly. Set air pressure at 50 psi then begin pressurizing the cylinder so the crankshaft stays locked. Hoist the vehicle and take out the torque converter access plug before you lift the car. Insert the (J 44226-3A) 15 mm holding bar onto the torque converter bolt to stop the crankshaft from rotating before lowering the vehicle. Secure the (J 44222) tool onto the Cylinder Head first to shield timing chain components. Later adjust both horizontal bolts on the Camshaft sprockets. Put the Camshaft caps in the rack and take off the Camshaft cap bolts while moving the sprockets with their attached timing chain away from the camshafts. Seal the cylinder with an appropriate adapter and boost air through it while you take off the Camshaft caps and camshafts from the engine block. Put the (J-44228-A) device to squeeze valve springs before taking out valve keys plus (J-44228-A). Switch the (J 38820) tool to remove the valve spring parts before removing the valve stem oil seals with the same tool. Check and clean the engine top brass. Apply new engine oil to the valve stems only after installing them into their position. Install valve stem oil seals through the (J 38820) and put in the valve spring following the valve spring retainer. After pressing valve springs with the (J-44228-A), add valve keys to the Cylinder Head before removing the (J-44228-A). Pressurize the cylinder unit and apply engine oil through it to coat Camshaft journals thrust face and lobes. Set the camshafts back in their natural location. Place Camshaft caps at their original slots and tighten cap bolts to 12 nm (106 lb in). Reposition the Camshaft sprockets back onto their camshafts then separate them from (J 44222). Insert a fresh intake Camshaft sprocket washer and bolt plus a new exhaust Camshaft actuator bolt before tightening the intake Camshaft sprocket nut to 20 nm (15 pound feet) on one pass but force the nut another 100 degrees using the (J 36660-A). Hand-tighten the exhaust Camshaft actuator bolt to 25 nm (18 lb ft) before completing it with the (J 36660-A) to an additional 135 degrees. Put the Spark Plugs in before setting the Camshaft cover above them. Raising the vehicle lets you take out the torque converter bolt holding the (J 44226-3A), place the access plug on it, and return the vehicle to ground level.