Toyota 13101-74130-01 Piston Sub-Assy, W/Pin

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Before installing the piston and connecting rod assemblies, ensure the cylinder walls are clean, the top edge of each cylinder is chamfered, and the crankshaft is in place. Remove the cap from the number one connecting rod, take out the original bearing inserts, and wipe the bearing surfaces with a clean, lint-free cloth. Clean the back side of the new upper bearing insert and lay it in place in the connecting rod, ensuring the tab fits into the recess and the oil holes align without hammering or lubricating the bearing. Clean the back side of the other bearing insert and install it in the rod cap, again ensuring the tab fits into the recess without lubrication. Stagger the piston ring gaps around the piston, slip a section of hose over each connecting rod cap bolt, lubricate the piston and rings with clean engine oil, and attach a piston ring compressor, leaving the skirt protruding about 1/4-inch. Rotate the crankshaft until the number one connecting rod journal is at bottom dead center and apply engine oil to the cylinder walls. With the dimple on top of the piston facing the front of the engine, gently insert the piston/connecting rod assembly into the number one cylinder bore, resting the bottom edge of the ring compressor on the engine block. Tap the top edge of the ring compressor to ensure contact with the block, then gently tap the top of the piston with a wooden hammer handle while guiding the connecting rod into place on the crankshaft journal, being cautious of any resistance. After installation, check the connecting rod bearing oil clearance before permanently bolting the rod cap in place by laying a piece of Plastigage on the number one connecting rod journal and cleaning the rod cap bearing face. Install the rod cap, ensuring the mating marks align, and apply a light coat of oil to the nuts before tightening them to the specified torque in three steps. Remove the nuts and detach the rod cap carefully to avoid disturbing the Plastigage, then compare the width of the crushed Plastigage to the scale to obtain the oil clearance. If the clearance is not as specified, check for dirt or oil between the bearing inserts and the connecting rod or cap, and recheck the journal diameter. Carefully scrape off any Plastigage material from the rod journal and bearing face without scratching the bearing, then apply a uniform layer of clean moly-base grease or engine assembly lube to both bearing faces. Slide the connecting rod back into place on the journal, remove the protective hoses, install the rod cap, and tighten the nuts to the specified torque, repeating the procedure for the remaining pistons and connecting rods. Important points include keeping the bearing inserts and connecting rods clean, ensuring the correct piston/rod assembly for each cylinder, having the dimple on the piston face the front of the engine, lubricating the cylinder walls, and lubricating the bearing faces when installing the rod caps. After all assemblies are installed, rotate the crankshaft by hand to check for binding, and finally, check the connecting rod endplay, comparing the measured endplay to the specifications to ensure correctness. If new rods or a new crankshaft were installed, inadequate endplay may require removal of the rods for resizing at an automotive machine shop.

If the pistons and cylinder walls are not damaged or excessively worn, and if the engine block is not rebored, new pistons are not necessary. However, new piston rings should always be used when an engine is rebuilt.

Slip a short length of plastic or rubber hose over each connecting rod cap bolt to protect the crankshaft journal and cylinder wall as the piston is removed.