Subaru 12013AB250 Piston Set RH

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Align the end gaps of the piston rings at a proper distance apart and replace the piston pin cir clips on the inner piston pin bore groove of each piston securely with the piston positioned in a way that the cir clip is placed in the groove with reference to the crankcase service hole. Wipe some of the fresh engine oil on the skirt and the rings and after that slide a piston ring compressor over the number one piston keeping the skirt about 1-inch sticking out to help you as you compress the rings as tight as possible. Slowly turn the crankshaft clockwise until the number one and two connecting rods are vertically aligned at B.D.C with the center of the cylinder. Move the number one piston into the cylinder very carefully with the markup on the crown of the piston facing forward in the engine, then apply a light impact with your hand on the side of the ring compressor where it is in contact with the crankcase. People should fit the wooden/plastic hammer handle on the piston and push the piston into the cylinder while keeping the ring compressor on to ensure the piston rings do not flop out. Should resistance be encountered while resuscitating a patient, stop and look for the cause apart from pushing the piston. Advance the piston in until the piston pin bore and the small end of the connecting rod is perfectly aligned with the service hole, by using fabricated alignment tool. Unscrew the piston pin and apply a thin film of clean engine oil on the piston pin followed by sliding it through the service hole to the piston and connecting rod, should there be resistance align the new pin. Next, because of the outer cir clip, a new one should be fitted in the piston pin bore groove carefully so that it should not be misplaced as it will lead to serious damage to the engine. Perform the same steps for the number two piston, and put the service hole plug gaskets with RTV sealant and tighten them. While cranking the engine with the crankshaft snout down, turn the crankshaft until the number three & four connecting rods are at BDC, and repeat the piston & pin installation for these pistons. Last of all, RTV sealant should be applied to the service hole plug and cover gaskets, and after that, the plug and cover screws must be tightened.

Temporarily install the crankshaft pulley bolt in the crankshaft front end to enable turning of the crankshaft and check for a wear ridge at the top of each cylinder; if present, it must be machined out before removing the pistons, using a ridge reamer to eliminate the raised material. Remove the plugs from the four service holes with an Allen wrench to access the piston pin cir clips, soaking them with penetrating oil if they are difficult to remove, and ensuring the wrench is fully inserted to avoid rounding off the hexagonal opening. Position the piston at bottom dead center by turning the crankshaft, then use needle-nose pliers through the service holes to remove the cir clips, utilizing a small flashlight to ensure proper alignment. For piston pin removal, a special tool is required to extract the pins through the service hole, which can be fabricated from steel rod; if the pins are varnished, a slide hammer or striking the tool may be necessary. Keep the pistons and pins together, marking the pistons for reinstallation in their original locations. The pistons can remain in the cylinder bores until the crankcase is separated, at which point they can be driven out with a wooden or plastic hammer handle, or they can be removed beforehand by turning the crankshaft slowly until the connecting rods push the pistons out slightly, inserting cleaned and oiled piston pins into the connecting rods through the service holes, and then turning the crankshaft until the pin pushes the piston from the bore before pulling the pistons out.

Keep the pistons and pins together and mark the pistons so they can be reinstalled in their original locations.

Lubricate the piston pin with clean engine oil and insert it into the piston and connecting rod. Install the outer circlip in the piston pin bore groove.

It should be machined out.

If any resistance is felt as the piston rings enter the cylinder, stop immediately. Find out what is hanging up and fix it before proceeding. Do not force the piston into the cylinder, as this may break a ring or the piston.

Lubricate the piston skirt and rings with clean engine oil. Use a piston ring compressor on the number one piston, leaving the skirt protruding about 1 inch to guide the piston into the cylinder. Compress the rings as far as possible.

The presence of a wear ridge.