Genuine Chevrolet Tracker Camshaft

Chevrolet Tracker Camshaft Parts Questions & Answers

• Camshaft,Intake
  91177422
  Q: How to clean and inspect Camshaft and Cylinder Head?

  A: When performing an engine overhaul, it is necessary to meticulously clean and thoroughly inspect the cylinder head(s) and related valve train components so as to effectively evaluate their condition. It is always important that you look out for any signs of cylinder head warpage especially if the engine has suffered severe overheating. Cleaning involves carefully scraping off old gasket material from surfaces of the head gasket, intake manifold, and exhaust manifold without damaging the cylinder head. Specialized gasket removal solvents might be used and accumulated scale in coolant passages should be cleared. Use a stiff wire brush to remove deposits from holes and clean up threaded holes with an appropriate size tap; while using compressed air to blow away debris. Remove oil from rocker arm shaft holes and then clean up the cylinder head and components with solvent, hastening the drying process by blowing them out with compressed air. Caustic decarbonizing chemicals may be used but handle them carefully. As regards inspection, check for cracks in the cylinder head, coolant leakage or damage; consult an automotive machine shop in case of cracks. Inspect for warpage on the head gasket mating surface using a straight edge and feeler gauge according to specified limits. Examine valve seats in combustion chambers for pitting, cracks or burning. Using a dial indicator measure valve stem-to-guide clearance; ask a machine shop for help on this subject if needed. Check valve faces for wear, distortion, cracks etc; ensure that valve stems, necks are well within standards as well as overall conditions of valves. Measure valve margin width then replace valves with narrow margins. Inspect spring retainers, keepers and rocker arm components in order to ascertain their durability; hence replace parts whose viability is questionable. In SOHC engines assess rocker arm faces, pivot contact areas, shafts and adjusters for damage including wear as well as squareness. Valves could then be reassembled into the cylinder heads if these components are in bad shape or excessively worn. Examine camshaft journals, rocker arms and lobes for damage including wear through signs of overheating. Measure cam lobe height, journal diameter and housing bore to assess wear and roundness. In DOHC engines, lifter contact with sliding surfaces must be looked at for wear, damage and scratches; also ensure that it moves in its bore. Measure lifter and lifter bore diameters in order to determine clearance then replace components or cylinder head when necessary.
• Camshaft,Engine
  91172318
  Q: How to remove and install the Camshaft and Lash Adjuster?

  A: Disconnect the negative battery cable. Then, drain the engine oil and coolant. Remove the Oil Pan and the oil pump strainer. Remove the Camshaft cover. Remove the timing chain cover. Away with small timing chain, chain tensioner, and camshaft sprockets. Erase the Camshaft Position (CMP) sensor. Rotate crankshaft 90 degrees in a clockwise direction. Loosely loosen the camshaft bearing cap bolts in order as you can see from instructions given on them. Locate positioning of studs on bearing cap . Take off bearing caps for camshafts and place them responsibly somewhere else without losing any of them. Take out dowel pin for large camshaft bearing cap and put it in a zip lock bag or something similar that will be safe until you need it again. Withdrawal of camshafts will be done at this stage. Note that there is an offset slot at the end of exhaust camshaft. Wipe top surface of each Lash Adjuster clean and then label it clearly so that when we are finished we can put it back together properly with all its parts intact to avoid further problems related to engine misfires or noise coming out from your car during operation anymore which could be harmful even while driving on road where safety matters most like our lives depend solely upon such cases happened at times due some reasons unknown yet being occurred here now before our eyes just like magic tricks going wrong sometimes leading us into total darkness forevermore unless someone brings light once more unto our world against all odds whatsoever otherwise it might happen too soon again without warning because nothing ever goes smoothly enough anyway thus always keeping us guessing what next might occur suddenly across our path ahead even though everything seems perfectly alright by now except for these few minor troubles came up already. Remove Lash Adjusters and turn them upside down into a pan containing clean engine oil after wiping them off thoroughly off their surfaces from dirt before storing them appropriately over night as above mentioned earlier this day itself. Squirt clean engine oil inside the Cylinder Head oil passages before fitting them all back into position where they came out or were removed after cleaning through by dipping into an appropriate solvent like acetone which acts quickly on chemicals thus dissolving any kind of impurities left behind during its application such as dust particles remaining here now because they might affect proper functioning another time being too dirty already since last use even though not looking dirty at all apart from these small signs. Squirt oil into the Lash Adjusters' oil holes and continuously check that it is being drained out through friction surfaces' holes. Mount Lash Adjusters in the cylinder head. Adjust the crankshaft sprocket 90 degrees counter-clockwise. Apply clean engine oil on camshaft friction and thrust surfaces, then perform installation. Ensure that pins on cams are aligned with match marks on cylinder head . Use a dowel pin for large camshaft bearing cap, apply sealant to mating surface of cap . Put cam bearing caps in their right places. Lubricate the camshaft bearing cap bolts and studs with clean engine oil and then install them in their correct locations and tighten them by hand. Then tighten gradually and evenly to torque following tightening sequence for each cap bolt specified above until reaching final point in between two values shown below (lb-ft). Install CMP sensor . Place camshaft sprockets, small timing chain and tensioner correctly. Mount timing chain cover. Mount camshaft cover. Install oil pump strainer together with oil pan. Refill coolant to cooling system and put enough oil into engine Start the engine to ensure there are no leaks at all related with it when running Check ignition timing; adjust if needed.