How should Piston be cleaned and assembled before installation on Toyota MR2 Spyder?

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All installation components must undergo cleaning process followed by application of fresh engine oil on moving elements before assembly with new gaskets O-rings and oil seals. Begin by installing the piston and connecting rod while integrating a new snap ring at one end of the piston pin hole where the end gap must not face the pin hole cutout and heat the piston to 80 - 90 degrees Celsius (176 - 194 degrees Fahrenheit). Then apply engine oil on the piston pin, position the front marks correctly between the piston and connecting rod until you push the piston inside. You should place the second snap ring at the piston pin hole and arrange it away from the end gap-to-pin hole cutout alignment. Fit compression rings using a piston ring expander which will have the code mark in the upward position while avoiding ring end alignment. When installing connecting rod bearings users should position the claw of the bearing against the groove and then install the bearings. Begin with main bearings by inserting the claw of each bearing into the cylinder block claw grooves before inserting the five upper bearings with proper orientation that includes oil hole placement in the block followed by lower bearing installation in the main bearing cap. Two thrust washers need installation under the No. 3 journal position of the cylinder block with the oil grooves directed toward the outside. Install the crankshaft onto the cylinder block while placing the bearing cap subassembly on top. Remove FIPG material totally and thoroughly clean all components. Seal packing (Part No. 08826-00080 or equivalent) should be applied to the bearing cap subassembly before part assembly begins within 3 minutes and subassembly completion should include plastic-faced hammer tapping for proper fitting. The technician must apply paint to the bearing cap subassembly bolts to mark their front section prior to reducing torque from 44 Nm (449 kgf-cm, 32 ft. lbs.) to 22 Nm (225 kgf-cm, 16 ft. lbs.) in several passes while tightening them for installation. The technician should ensure each bolt opens to a 45 degrees angle then verifies the painted marks align at a 90 degrees angle to the front section. The installation procedure for hexagon head bearing cap subassembly bolts requires a 18.5 Nm (189 kgf-cm, 14 ft. lbs.) torque setting followed by a smooth crankshaft rotation test. Use a piston ring compressor to install the piston assemblies by putting their front mark in the forward direction before confirming the thrust clearance of the crankshaft. The installation of the connecting rod cap requires placing it onto the rod by matching its numbered cap with the rod and positioning the pin dowels while checking that the protruding cap oriented right. Install and alternately tighten the 2 connecting rod cap bolts to 20 Nm (204 kgf-cm, 15 ft. lbs.), use paint to mark the front bolting positions before readjusting them by 90 degrees for smooth crankshaft rotation. Before finishing check that thrust clearance on connecting rods is correct then install the rear crankshaft oil seal followed by a new gasket with oil strainer that needs two nuts and a bolt tightened to 9 Nm (92 kgf-cm, 80 inch lbs.). The technician should remove all FIPG packing materials from the oil pan before using a nozzle to apply new seal packing (Part No. 08826-00080 or equivalent) with a 4 to 5 mm (0.16 to 0.20 inch) diameter opening. Then install the oil pan with 14 bolts and 2 nuts by tightening them evenly to 9 Nm (92 kgf-cm, 80 inch lbs.). Begin with installing an oil filter union to 30 Nm (306 kgf-cm, 21 ft. lbs.) while also wrapping oil filter, oil pump, and engine coolant drain union joints with adhesive (Part No. 08833-00080, THREE BOND 1344, LOCTITE 242 or equivalent) to 20 Nm (204 kgf-cm, 15 ft. lbs.). Rotate the drain union clockwise to position the drain port facing downwards. The knock sensor installation requires 39 Nm (400 kgf-cm, 29 ft. lbs.) torque and the thermostat should follow, after that the water bypass pipe gets secured at 9 Nm (92 kgf-cm, 80 inch lbs.) and finally the installation process includes the timing sprockets with timing chain and the engine stand removal.

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