Genuine Chevrolet Tracker Variable Timing Sprocket

Chevrolet Tracker Variable Timing Sprocket Parts Questions & Experts Answers

• Sprocket,Camshaft
  91174417
  Q: How to remove and install timing chain and Sprocket on DOHC engine?

  A: Before you start removing and replacing timing components be very careful because the timing system is complex and errors can result in serious damage to an engine. If you have never done such repairs before, consult with a professional. Start by removing the Camshaft cover and intake manifold timing chain cover. Turn the crankshaft so that the key is aligned with a mark on the block while ensuring that the camshaft sprocket marks align with those on the head, and check that the arrow mark on the idler sprocket points up, which means that No. 1 piston is at top dead center (TDC). Remove bolts and nut for adjuster of timing chain tensioner, release tension and remove adjuster. Thereafter, remove each sprocket retainer bolt from intake and exhaust camshafts using a wrench to hold each shaft still. Be careful not to rotate camshafts independently of crankshaft while removing camshaft timing chain and sprockets so as not to damage them. Likewise, remove big timing chain, idler sprocket and crankshaft sprocket by taking off both camshaft cover and timing chain cover then repeat step one until number piston one reaches TDC once again. Get rid of small timing chain then take out camshaft sprockets followed by tensioner as well as guide for this chain. Take off tensioner of timing chain; idler sprocket, timing chain along with crank shaft sprocket. Check all parts for oil or dirt contamination as well damage or excessive wear when inspecting components. Change any worn out or damaged part. For installation match crankshaft's stationary key mark with its corresponding mark on block when installing crank shaft sprocket having match mark facing outwardly towards you. Lubricate bushing of idler sprocket then install it in conjunction with idler sprocket itself. Fit big timing cycle after ensuring that match marks are in line with each other. Lubricate all components release plunger on tensioner and hold it in place. Install timing chain guide, make sure all marks are aligned properly. For small timing chain and camshaft sprockets align the crank shaft sprocket key and arrow mark on idler sprocket as well as knock pins on camshafts. Install small timing chain and sprockets making sure that yellow plates are aligned with arrow mark on idler sprocket whereas dark blue plates should be aligned with arrow marks on the camshaft sprockets while tightening bolts for immobilizing them firmly. Push down the plunger of tensioner after installing the tensioner itself which is then bolted tightly enough. Rotate crank shaft two complete revolutions checking alignment of timing marks while doing so. Lubricate each part using clean engine oil.
• Sprocket,Camshaft Timing,LH (On Esn)
  91176110
  Q: What are the precautions and steps to follow when removing and installing a timing belt and Sprocket on SOHC engine?

  A: While replacing and installing the timing belt, be very careful, as any error can lead to serious engine problems. If you don't have much experience in making such repairs, it is better not to risk and consult a good specialist. Never rotate the crankshaft counterclockwise and do not try to turn it using the camshaft sprocket bolt. More so, ensure that no bending, twisting or turning the timing belt inside out occurs; keep it away from oil, coolant or fuel. Do not use the timing belt tension to hold the camshaft or crankshaft while installing pulley bolts. The process involves discharging refrigerant and removing hose from suction pipe for models with AC system. Thereafter, disconnect negative battery cable, support vehicle on jackstands loosen locknuts and adjust valve adjustment screws on 8-valve engines set parking brake block rear wheels. Remove drive belts, fan, fan shroud, water pump pulley and crankshaft pulley bolts (if removing crankshaft center bolt follow specific instructions). Then remove timing belt cover only if reusing belt paint an arrow on it showing direction of rotation. Loosen tensioner pulley and bolt secure tensioner temporarily remove timing belt. In case remove crankshaft sprocket together with belt guide if you plan to replace camshaft oil seal remove camshaft sprocket and cover. Look at all parts carefully for signs of damage or wear. For installation make sure alignment of valve timing marks is correct then slip on timing belt while releasing tensioner. Rotate the crankshaft two complete revolutions retighten tensioner nut temporarily install crankshaft pulley turn another two full revolutions of crank shaft.Re-check valve timing marks alignment retighten tensioner bolt and nut re-install all remaining parts adjust valve clearances let sit overnight when cold for eight-valve engines proceed as required ensuring proper procedures are followed for a successful engine start up road test.