Genuine Pontiac G6 Lash Adjuster

Pontiac G6 Lash Adjuster Parts Questions & Experts Answers

• ADJUSTER ASM-HYD VLV LASH
  12686787
  Q: How to remove and reinstall camshafts and Lash Adjuster in four cylinder engine on Pontiac G6?

  A:

  This is rather delicate work that must be done with special equipment and, hence, it is advisable to wade through the entire process and gather all the tools that are going to be used in the process. Start by loosening the cable connection to the negative terminal of the battery then follow by the removal of the valve cover. Rotate the engine to TDC for cylinder number one, anti-clockwise until the crankshaft reaches sixty degrees before TDC, do not remove the camshafts at TDC number one because this will damage the valves and pistons. Subsequently, take off the upper Timing Chain guide and in its place, fix a locking tool for the camshaft sprockets to stay locked. When c.f. loose the camshaft sprocket bolts then you can slide the camshaft sprockets forward but before that make sure that you tighten the wingnuts. Numbers are inscribed on the main part of the camshaft cap with the numeration which will show the position; each bearing cap bolt should be diluted gradually and equally so as to let the camshaft float up from the cylinder head. Group all component of each camshaft respectively to ensure that they are not misplaced. The next step is to take out the rocker arms and set aside in order that they may be refitted, together with the hydraulic lash adjusters, which must be withdrawn from the holes in the cylinder head in which they are carried. Remove and mark the position of the exhaust bearing caps then do the same thing to the rocker arms and hydraulic lash adjuster. See also that each of the hydraulic lash adjusters is worn out or not and then check their diameters to find out if they have undergone excessive wearing. Check the conditions of the rocker arms and camshaft lobes; measure height of the lobe and compare it for high inconsistency. Examine under the bearings and valley deck for wear and measure the diameter of camshaft bearing journals, and cylinder head bearing surfaces. To ensure that the bearing journals' oil clearance is accurate, clean all the bearing surfaces followed by the installation of the camshafts and the bearing journals with Plastigage across each journal, to find the width of the flattened Plastigage. If any bearing is worn out to the extent of the service limit, then it is advisable to replace the camshaft and or cylinder head. To check camshaft endplay clean the bearing surfaces fit the camshafts and bearing caps in position and use dial indicator to measure the end play of the cam shaft. In the event that the endplay is beyond the service limit, a new camshaft thrust cap should be fitted. For the installation, it is required to lubricate the rocker arms and hydraulic lash adjusters and place them in their appropriate positions and lubricate camshafts before the establishment of the same. Place the camshaft bearing caps in place, use a step like sequence to tighten the bolts, slide the camshaft sprockets and timing chain forward towards the camshafts so that the slots in the timing chain fit into the projections on the sprockets. New bolts are required to be put on and the camshaft sprockets tightened, after which the camshaft locking tool has to be withdrawn and the front and rear caps of the camshaft are to be installed. Bolt on the upper timing chain guide and turn the engine with your hands to feel some level of resistance. Finally, reconnect the battery.