Genuine Chevrolet Tracker Piston

Chevrolet Tracker Piston Parts Questions & Experts Answers

• Piston Kit,Os:050 (On Esn)
  91177382
  Q: How to clean and inspect piston/connecting rod assemblies?

  A: Before going through the inspection process, clean the piston/rod assemblies and remove the original Piston Rings. When you reassemble the engine, make sure to use new piston rings. Using a piston ring installation tool, gently take off the rings from the pistons trying not to spoil them. Simply scrape away carbon deposits on top of the piston then use a hand-held wire brush or fine emery cloth after most of it is gone. Do not use a wire brush in a drill motor because it can erode the soft material of the piston. Take out all carbon from ring grooves using either a tool for cleaning grooves or broken old rings without removing metal or damaging side faces of grooves. Having removed the deposits, wash off pistons/rods using solvent and dry up with compressed air ensuring clear oil return holes at back sides of ring grooves. In case pistons and cylinder walls are not significantly damaged or worn excessively and if there is no need for reboring an engine block, then new pistons may not be necessary; otherwise when overhauling an engine always replace with new ones. Examine each piston carefully for any signs of cracks around its skirt, pin bosses as well as ring lands. Watch out for scores at scuffing points on skirts thrust faces, pit marks in crown that look like worm holes and burnt edges around upper part pointing to probable overheating or an abnormal combustion problem. Check what causes include intake air leaks, wrong fuel/air mixture ratios, timing differences or EGR system failures (Garrett 460). If you see small pits, corrosion means coolant leakage into combustion chamber or crankcase requiring correction. Measure both piston ring side clearance and bore-to-piston clearance to ensure they are in specifications. Confirmations about piston-to-rod clearance may be obtained from an automotive machine shop if need be. Should one require separating pistons from connecting rods he should consult an automotive machine shop. Inspect rods for cracking and damage, take off rod caps for bearing surface inspection purposes only to replace old bearings when an engine is being rebuilt as a result of connecting rod knock and make sure that new rods are installed where necessary.
• Piston,Engine
  96068583
  Q: How to remove piston/connecting rod assemblies?

  A: The piston/connecting rod assemblies should be removed after the Cylinder Head, the oil pan and the oil pickup have been taken out. Use your fingernail to determine if there is a ridge or not at the upper limit of ring travel (about 1/4-inch down from the top of each cylinder). If a ridge has formed due to carbon deposits or cylinder wear it must be removed completely with a special ridge reamer tool. Follow all directions given by the manufacturer of the tool. It is important to remove these ridges before attempting to remove piston/connecting rod assemblies as failure to do so may cause piston breakage. Turn engine upside down so that Crankshaft faces upwards once all ridges are removed from cylinders. Check end play with feeler gauges before removing connecting rods. Slide them between first connecting rod and crankshaft throw until play is removed from feeler gauge(s). End play equals thickness of feeler gauge(s). When end play exceeds its service limit, new rods will have to be used. The installation of new rods (or new crankshaft) may cause this value to fall below minimum specified. Repeat steps for other connecting rods. Look for identification marks on the connecting rods and caps. If they are not marked clearly then use a small center punch to make an appropriate number of indentations on each rod and cap (1, 2, 3 or 4 depending on which cylinder it belongs to). Loosen each nut on the connecting rod cap nut by half-turns until they can be unscrewed by hand safely. Remove bearing insert and number one connecting rod cap. Do not let bearing insert slip out of cap. To prevent nicking or gouging the crankshaft journal and cylinder wall while piston is being removed, place a short length of plastic or rubber hose over each connecting rod cap bolt. Through the top of engine push out both bearing insert and connecting rod/piston assembly. Use a wooden hammer handle to push on the upper bearing surface in the connecting rod. If ridge is still present in a cylinder, repeat steps for other cylinders. After removal, reassemble connecting rod caps and bearing inserts in their respective connecting rods and install cap nuts finger tight. The old bearing inserts should be left in place until reassembly to prevent accidental nicking or gouging of the connecting rod bearing surfaces. Don't separate the pistons from their connecting rods.
• Piston Set, Os:050
  96067711
  Q: How to install piston/connecting rod assemblies?

  A: To ensure clean cylinder walls and chamfer top edge of each cylinder before installing piston/connecting rod assemblies. Similarly, for the installation to be successful, the Crankshaft must be positioned well. Therefore, by removing the cap from the end of number one connecting rod and wiping bearing surfaces of both connecting rod and cap with clean cloth. The tab on this bearing insert should fit into a recess in the rod too. Also, another bearing insert has to be cleaned at its backside before it is put into position in the rod cap with its tab matching a recess in the cap. After that, put Piston Ring gaps around piston then apply some clean engine oil to lubricate both piston and rings. Using a Piston Ring Compressor, attach it to pistons; compress also until rings become flush with pistons themselves. Finally rotate crankshaft so that number one connecting rod journal is at bottom dead center then coat cylinder walls with an engine oil film. Match pistons to cylinders and gently insert assembled piston/connecting rods assembly into number one cylinder bore. While guiding connecting rod onto crankshaft journal tap top of piston using wooden/plastic hammer handle as well as fit it perfectly in place. Plastigage will be used to measure clearance which requires being checked after assembling the entire unit (piston/rod). To do so, plastigage material needs to be wiped out from either the bearing face or rod journal followed by application of moly-based grease or clean engine assembly lube on them all over again Clean Plastigage material off bearing face/rod journal and then apply a thin coating of clean molybase grease or engine assembly lube across them Slide back connecting road into place over journal; install next rod cap using nuts that will need tightening up until reaching required torque value Awaiting for completion suivant cet ordre de retirer les composants restants. Finally install other remaining components in reverse order.