GM 91173870
Piston

The first step when replacing a piston along with connecting rod and bearing starts with fuel pressure relief and negative Battery Cable removal. Once you lift the vehicle with support you must drain all engine coolant along with engine oil into a drain pan. You must take out the front Exhaust Pipe together with sixteen bolts and two nuts along with the crankshaft sensor and the engine Oil Pan. The replacement process begins with bracket bolt removal from the oil pump strainer followed by removing the oil pump strainer and its bolt component and finally extracting the oil pump strainer seal. Start by lowering the vehicle then remove the Timing Belt accompanied by the Intake Manifold and Exhaust Manifold together with the Cylinder Head. Write down cylinder numbers on the piston set, connecting rods and bearing caps before breaking down all engine parts by their cylinder order. Fitting a hose piece over rod bolts threads ensures prevention of damage before removing rod bearing caps. The cylinder bore top surface should be decarbonized before taking out the piston assembly with connecting rod. The j 8037 ring compressor (J 8037) enables installation while engine oil should be applied throughout the process to pistons and rings as well as cylinder walls and connecting rod bearings and crankshaft. Icipants must check that the piston arrow mark should face toward the crankshaft timing pulley section during installation. Use the j 8037 ring compressor to guide the connecting rod into position by inserting it into the cylinder bore using the j 8037. Gently tap the piston head while aligning it with the rest of the components before attaching the lower connecting rod bearing to the connecting rod cap. Together secure the connecting rod cap through two nuts before tightening them to 35 nm (26 ft. Lbs.). The replacement begins with positioning the new Cylinder Head gasket where the word top marks face the Cylinder Head. Installation continues with the Cylinder Head followed by Timing Belt then Intake Manifold and Exhaust Manifold and concluding with oil pump strainer and engine Oil Pan. Place the engine oil Drain Plug gaskets followed by tightening the Drain Plug at 35 nm (26 ft. Lbs.). The procedure concludes with attaching the negative battery wire followed by engine oil refilling to recommended levels and beginning the engine while inspecting for exhaust leaks along with oil pressure control.