Genuine Chevrolet Tracker Camshaft

Chevrolet Tracker Camshaft Parts Questions & Experts Answers

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

  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 in DOHC engine on Chevrolet Tracker?

  A: Disconnect the negative side of the battery. Drain off the engine oil and coolant. Take out of place the Oil Pan and the strainer for the oil pump. Get off the camshaft cover. Remove timing chain cover.Remove small timing chain, chain tensioner and camshaft sprockets. Take off Camshaft Position (CMP) sensor.Rotate crankshaft in direction 90 degrees anti-clockwise.Loose bolts of camshaft bearing cap in turning given sequence.Keep in your mind where are studs located on a bearing cap.Take out bearing caps for cams.Collect pins from a big bearing cap for cams into plastic bagging.Delete camshafts from their beds.The end of an exhaust cam is made with an offset slot.Wipe, mark each rocker arm.Backlash adjusting screw must be taken off and dipped into clean engine oil.Put lubricant inside Cylinder Head through lifters openings for these before you install your lifter to its place.Pressurized should come out on lifter's friction surfaces when you squeeze it.Installation will be performed in such a way that adjusting screws go to their places.Make sure that pins on cams match with marks on cylinder head.Apply sealer to contact surface between this dowel pin and big camshaft bearing cap.Fit those parts to correct bores at caps.Screw down those studs into proper holes using only oily hands.Then tighten all four torque evenly going clockwise starting from #1 bolt up to #4 bolt which stands at right bottom corner.Put CMP sensor back.Camshaft sprocket can be putted together with small timing chain and hydraulic tensioner.Everything will be sealed by putting back on top part of front cover.The lid covering cylinders' tops should be mounted as well.Posting mounting details about oil strainer fixedness along with sump filling.Refuel radiator via filling neck with coolants and pour some oils within block.Start engine, check for leaks.Recheck ignition timing as required.