Mopar 4593589AB Piston

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When positioning the piston and connecting rod assemblies make sure that the cylinder walls are free of contaminants, the top land of every cylinder is crowned, and the crank-shaft has been installed. Take off the cap of the number one connecting rod while ensuring that you look at the marks that were made; clean the bearing surfaces of the rod with a fabric . Do not touch the new bearing inserts with fingers as this expose the bearing insert to contaminants. Then, please clean the back side of new upper bearing insert and fit it in the connecting rod such that without hammering in the tab fits in the recess. Again, follow this process with the lower bearing insert in the rod cap where both mating surface should be free of oil and dirt. Align the gables of the piston rings properly, direct a hose over every connecting rod cap bolt, apply clean engine oil onto the piston and the rings, then fit a piston ring compressor such that part of the skirt can be observed. Bore the engine horizontally in such a way that the number one connecting rod journal is facing the bottom and lubricate the walls of the cylinder with the engine oil. Place the piston/connecting rod assembly so that the piston is on the up/even/required stroke, apply a gentle impact so as to seat the piston in the cylinder bore while slipping on the connecting rod to the crankshaft journal. The final step is measurements of oil clearance on connecting rod bearing using Plastigage and the crushed width has to be compared with the scale. If the clearance is incorrect, be sure that there were no debris during the measurement and inspect the journal diameter. Remove the Plastigage from the bearings with great care, spread a thin layer of oil on the bearing faces and replace the connecting rod and cap which should be tightened three quarters of a turn in sequence. Do the same for other assemblies and wipe the bearing surfaces, make sure the piston is the correct way round, lubricate the cylinder walls and feel for binding by rotating the crank shaft. Last but not the least, check the connecting rod end play as well and make sure it is within standard in case of variation inform an automotive machine shop.

A piston ring installation tool should be used to carefully remove the rings from the pistons without nicking or gouging them.

Ridges caused by carbon deposits or cylinder wear must be completely removed with a special tool, as failure to do so may result in piston breakage.