What steps should be taken before starting the inspection process of piston/connecting rod assemblies on 2015 Nissan Juke?

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When beginning the inspection procedures, always degrease the piston/connecting rod assemblies and take out the original piston rings from the pistons; new rings are to be used during the reassembly. Slowly expand more of the older rings up on to the pistics, employing old feeler blades so that they don't drop down to unoccupied positions and also while trying not to scratch the pistons. Remove carbon build up with an old ring to prevent cutting into the actual metal when rubbing off the excessive carbon on the piston top and the ring grooves. Wash the assembly with paraffin or the most appropriate solvent cleaning for that particular equipment, to check on condition of oil return holes. If the pistons and cylinder bores are without damage and require no rebore then the original pistons can be mated back in but the rings that go around them must always be new. Every piston should be scrutinized for the signs of crack and scores, scuff or burnt lands, if seen, cooling and lubricating systems must be properly checked to heat and combustion abnormality. Externally, corrosion such as pitting may indicate leakage of the coolant; this must be fixed to avoid future occurrences. Check the value of piston ring-to-groove clearance by using the feeler blade; if value is higher than HGT regards, a new set of pistons is required. Measurement for pistons should be precise and a recommended automotive engineering workshop should be the one to undertake the job as well as provide suitable pistons for re-bore if the situation arises. Feel the gudgeon pin to check its fit and to see if it is too loose, which would signify wear. For models with circlips, trace the piston and connecting rod and before the separation of the two pull out the circlips and gudgeon pin without causing injury to the two parts. Check the connecting rod for cracks or distortion since damage is highly improbable unless the engine has seized or over-heated The above checks are among the most detailed and are preferably done by a specialist. In refitting pistons, ensure the pistons are fitted in accordance with the orientation marked during removal and apply some drops of clean engine oil to the gudgeon pin then insert the pin and ensure that the piston is freely moving before fitting new circlips on the piston, they should be located correctly in their respective grooves. It is more easier to warm the piston before trying to put in the gudgeon pin in place.

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