Toyota 13011-31130 Ring Set, Piston

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Before installing the new piston rings, the ring end gaps must be checked, assuming that the piston ring groove clearance has been verified correct. Lay out the piston/connecting rod assemblies and the new ring sets to match the ring sets with the same piston and cylinder during the end gap measurement and engine assembly. Insert the top ring into the first cylinder, ensuring it is square with the cylinder walls by pushing it in with the top of the piston, positioning the ring near the bottom of the cylinder at the lower limit of ring travel. To measure the end gap, slip feeler gauges between the ends of the ring until a gauge equal to the gap width is found, ensuring the feeler gauge slides between the ring ends with slight drag. Compare the measurement to the specified values; if the gap is larger or smaller than specified, double-check to ensure the correct rings are being used. If the gap is too small, replace the rings without filing the ends to increase clearance. Excess end gap isn't critical unless it exceeds 0.040-inch, so verify the correct rings for your engine. Repeat the procedure for each ring in the first cylinder and the remaining cylinders, keeping rings, pistons, and cylinders matched. Once the ring end gaps have been checked and corrected, install the rings on the pistons, starting with the oil control ring, which consists of three components. Slip the spacer/expander into the groove, ensuring any anti-rotation tang is inserted into the drilled hole in the ring groove, and stagger the ring end gaps around the piston. Install the lower side rail without using a piston ring installation tool to avoid damage, and then install the upper side rail similarly. After installing the three oil ring components, check that both side rails can turn smoothly in the ring groove. Next, install the middle ring, ensuring the identification mark faces up toward the top of the piston, and follow the instructions on the ring package, as different manufacturers may have varying requirements. Use a piston ring installation tool to ensure the mark is facing up when slipping the ring into the middle groove, taking care not to expand the ring more than necessary. Finally, install the top ring in the same manner, ensuring the mark is facing up, and be cautious not to confuse the top and middle rings, then repeat the procedure for the remaining pistons and rings.