GMC 88894280 Piston Asm,(W/ Pinion)(Std)

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The inspection process for the piston/connecting rod assemblies should start by cleaning them and removing the original piston rings from the pistons, then replacing them with new piston rings during engine reassembly. With care to avoid damaging the piston surfaces, pull out the rings using a piston ring installation tool. By scraping or using a handheld wire brush or fine emery cloth, eliminate carbon deposits from the piston crown. Avoid electric drills with wire brushes as these can eat away at the soft material of the piston. Use a piece from an old ring or a piston ring groove cleaning tool to get rid of carbon deposits from the ring grooves without removing any metal or causing scratches. Consequently, solvent-wash and blow off each of them if possible in order that oil return holes are not clogged on their back sides within ring grooves. Also, check for cracks around skirt, pin bosses and ring lands or overheating/abnormal combustion scoring, scuffing, holes or burned areas in thrust faces, crown and edge which need addressing if found. If there is corrosion with small pits it may indicate coolant leakage; this must be sorted out. Piston to bore clearance; measure clearances on one side of the compressor guard ensuring perfect match so as to check out for proper fitting: plus evaluate piston –to-rod clearance seeking help of automotive machine shop for reboring and new pin installation whenever necessary. In case it becomes necessary to separate pistons from connecting rods, professional assistance must be sought in order not to disassemble pistons and connecting rods also. Finally, check connection rod for cracks/damages, remove rod caps temporarily to inspect bearing surfaces and replace old bearings before tightening nuts finger tight.

Before the piston/connecting rod assemblies are removed, take off cylinder heads, oil pan and the oil pump. Using a ridge reaming tool, completely eliminate any ridge existing at the top of each cylinder. If this is not done before removing them, pistons will be broken. Fold engine up-side down so that the crankshaft is turned facing upwards after removal of ridges from cylinders. It is important to check end play on connecting rods with a feeler gauge before they can be removed. Place the first feeler gauge in between crankshaft throw and first connecting rod until all play is gone. The endplay equals to one or more thicknesses of feeler gauges if used together in a stack. When endplay exceeds service limit for wear, it means new connecting rods will have to be installed. Any identification marks should be on caps and rods of connection Check All marks are checked bearing Let every single nut on the cap of a connecting rod loosen by half turn until it comes out by hand Remove bear- ing insert remove Wear safety glasses throw Protects walls while also protecting journals Push down on upper bearing Use wood Hammer handle Double-check for forgotten ridges or pieces within individual bores Repeat for each remaining bore After disassembly install nuts onto cap bolts so that caps may take place upon bearings without tightening them too far Use old inserts when cleaning journals prior to reassembly.

The first step in installing piston/connecting rod assemblies is to make sure that the cylinder walls are spotless, chamfer the top edge of each cylinder and to have placed crankshaft correctly. So, remove number one connecting rod cap from its end and thereafter remove old bearing inserts and carefully wipe off all bearing surfaces of both connecting rod and cap. For this reason, they should remain absolutely clean. New upper half of a bearing should be cleaned on its opposite side before being put within a piston pin bore with its tab fitting securely into the recess in a rod. The same procedure should then be followed for the other bearing insert installed in the cap of the rod; ensuring that it lines up with tab on cap's recesses. At this point do not lubricate bearings yet. Leave ring gap spacing intact, lubricate piston and rings with clean engine oil before attaching piston ring compressor to the piston hand tool/fixture. Ensure that compressor sits on bottom edge of an engine block while inserting piston into number one cylinder bore such that its notch faces front of an engine. Gently tap down all pistons putting rods lightly on top of crankshaft journals being careful not to force them onto place making sure number one cylinder bore face is towards front direction as well as lower edge of compressor touches engine block gently guiding connecting rods down into correct positions by tapping pistons only slightly during assembly process to avoid damage but also ensure all pistons compression rings are facing upwards . After you have fixed piston/connecting rod assembly at their place you must check oil clearance in connecting rod bearings prior to tightening down these nuts permanently Since it is necessary lay Plastigage across number one connecting rod journal then install the cap getting mating marks lined up properly and then tighten nuts according to specified torque over three steps Thereafter don't disturb Plastigage if it is there while removing rod cap; then simply compare width between flattened Plastigage taken from scale and the value in Specifications to confirm oil clearance accordingly. Lastly, remove all Plastigage material from rod journal and bearing face thereby ensuring that no marks or imperfections are left behind on them; wipe clean both of these surfaces so that they can be completely dry and then apply a thin coat of moly-based grease evenly over them. To expose face of bearing insert in connecting rod push piston into cylinder, slide the rod back onto journal, take off protective hoses from rod cap bolts, tighten down nuts according to specified torque through three steps for this reason. Repeat this process for all remaining pistons/connecting rods. Rotate the crankshaft by hand to check for any obvious binding Finally, make sure that the end play is within specifications as presented in Specifications table by measuring each connecting rod end-play value against its required values; if brand new rods or a new crank shaft were used resizing might be necessary at automotive machine shop when end play is excessively low.

After installing all piston/connecting rod assemblies, you should rotate the crankshaft by hand to check for any binding. It is also important to check the connecting rod endplay for correctness. If necessary, the rods may need to be taken for resizing if new components were installed.

Before removing piston/connecting rod assemblies, you should check for ridges at the upper limit of ring travel in each cylinder and remove them if present to avoid piston breakage. You should also verify connecting rod endplay with feeler gauges and address any deviations to ensure it falls within the service limit.