Toyota 13301-0A010 Piston Sub-Assy, W/Pin

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Before installing piston/connecting rod assemblies, clean cylinder walls, and chamfered top edges. Remove the cap from the first rod, replace bearing inserts, and clean surfaces. Check rod bearing oil clearance by fitting upper bearing inserts in the rod and cap. Arrange piston ring gaps, lubricate pistons and rings, and use a piston ring compressor during installation. Insert the piston/rod assembly into the first cylinder bore, guiding the rod to the crankshaft journal. Measure the crushed Plastigage and compare it to specifications. If clearance is incorrect, check the bearing insert size and journal diameter.

Before inspection, clean the piston/connecting rod assemblies and remove the original piston rings using a piston ring installation tool. Remove carbon from the piston top with a wire brush or fine emery cloth and use a groove-cleaning tool to remove carbon deposits from the ring grooves. Clean the assemblies with solvent and dry with compressed air. If the pistons and cylinder walls are undamaged, new pistons may not be necessary, but always use new piston rings when rebuilding an engine. Inspect each piston for cracks, scoring, holes, and burned areas. Measure the piston ring groove clearance and the piston-to-bore clearance. Check the piston-to-rod clearance for wear. If pistons must be removed, have the rods checked for bend and twist. Inspect the connecting rods for damage, inspect the rod and cap bearing surfaces, and replace old bearings if necessary.

Before removing the connecting rods, the endplay should be checked with feeler gauges. Feeler gauges should be slid between the first connecting rod and the crankshaft throw until the play is removed.

A piston ring groove-cleaning tool or a piece broken off the old ring can be used to remove carbon deposits from the ring grooves.

Rotate the crankshaft several times by hand to check for any obvious binding and then check the connecting rod endplay.

Each piston should be carefully inspected for cracks around the skirt, at the pin bosses, and at the ring lands.

Check the endplay with feeler gauges by sliding them between the first connecting rod and the crankshaft throw until the play is removed. The endplay is equal to the thickness of the feeler gauge(s).

After removal, the connecting rod caps and bearing inserts should be reassembled in their respective connecting rods and the cap nuts should be installed finger tight. The pistons should not be separated from the connecting rods.

If the oil clearance needs adjustment, investigate bearing insert size, cleanliness, and journal diameter.