Subaru 12013AB280 Piston Set RH

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The crankshaft pulley bolt is temporarily installed at the front end of the crankshaft to allow for turning. If there is a wear ridge at the top of each cylinder, machine it out. The four service holes plugs are removed out using an Allen wrench so as to access piston pin circlips. In case the removing process becomes difficult for these plugs, soak them with penetrating oil and make sure that the tool completely fits into round off opening. By turning the crankshaft, place the piston at bottom dead center and remove its circlip with needle-nose pliers through these service holes. Through this service hole use either a special removal tool or a homemade one to pull out piston pins from inside them. Keep pistons and pins together; mark them for reinstallation purposes. Pistons can be left in the cylinder bores until separation of the crankcase or driven out by means of a wooden or plastic hammer handle; conversely, before separating the crankcase, pistons can be taken-out by slowly turning over onerous shaft till connecting rods push them just beyond their very slight movement limits thus inserting piston pins into such rods and then turn back cranks thus pushing pistons away from bores prior to pulling them outright.

Repeat the procedure for the number two piston. Apply RTV sealant to the service hole plug gaskets and install the gaskets and plugs, tightening the plugs to the specified torque.

If desired, you can remove the pistons before separating the crankcase by following these steps: a) Turn the crankshaft very slowly until the connecting rods push the pistons out slightly. b) Insert the piston pins (clean and oil them first for easy installation) into the connecting rods through the service holes, then turn the crankshaft until the pin pushes the piston from the bore. c) Pull the pistons out.

The presence of a wear ridge.

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.

Yes, the pistons can remain in the cylinder bores until the crankcase is separated. They can then be driven out with a wooden or plastic hammer handle, or they can be removed first.

Push the piston in until the piston pin bore and the small end of the connecting rod are aligned in the service hole. You can fabricate an alignment tool to insert into the service hole and align the connecting rod with the piston pin bore.

Yes, rotate the crankshaft until the number three and four connecting rods are at bottom dead center, aligning them with the center of the cylinder. Repeat the piston and pin installation procedure for pistons three and four.