GASKET 2256005 - Caterpillar

Remove Pistons
START BY:a) remove cylinder headsb) remove oil pump 1. Remove the carbon from the top inside surface of the cylinder liners.2. Turn the crankshaft until two pistons are at bottom center.3. Remove bearing caps (1) from the two connecting rods. Put pieces of rubber hose or tape on the threads of the connecting rod bolts as protection for the crankshaft. Put identification on each bearing cap so it will be installed on the correct connecting rod. 4. Push the pistons up until the piston rings are clear of the cylinder liner. Remove pistons (2).
Do not turn the crankshaft while any of the connecting rods are in the engine without the caps installed. Do not damage the cooling tubes when the pistons are removed.
5. Do Steps 1 through 4 for the remainder of the pistons.Install Pistons
1. Be sure that the pistons are installed with flat surfaces (2) of the connecting rods toward each other and the chamfered sides (1) toward the crankshaft. 2. Put clean engine oil on the piston rings and cylinder liners.3. Put two pistons in position opposite of each other in the correct bore of the block. Install pistons (3) with tool (A). For more detail about checking bearing clearances and installation of connecting rod bearings, see REMOVE AND INSTALL CONNECTING ROD BEARINGS.4. Check the bearing clearances with Plastigage.5. Put clean engine oil on bolts (4). Install caps (5) and nuts finger tight. Make sure flat side (6) of each cap is toward the other cap. The chamfered side must be toward the crankshaft. Tighten each nut to a torque of 80 8 N m (60 6 lb.ft.). Put a mark across the nuts and bolts. Tighten each nut 120° more.
Do not use an impact wrench to tighten the nuts the additional 120°.
6. Check the side clearance between two connecting rods on the same crankshaft journal. Clearance must be 0.28 to 0.84 mm (.011 to .033 in.) for new rods.7. Do Steps 1 through 6 for the remainder of the pistons.Disassemble And Assemble Pistons
START BY:a) remove pistons 1. Remove bearings (3) from the connecting rod and connecting rod cap.2. Remove retainer ring (1) with tool (A).3. Remove pin (2) and connecting rod (4) from the piston. 4. Remove the piston rings (5) from the piston with tool (B). Clean the piston ring grooves on the pistons with an acceptable ring groove cleaning tool. See USE OF PISTON PIN BEARING REMOVAL AND INSTALLATION TOOLS, SPECIAL INSTRUCTIONS, Form No. SMHS7295.5. Heat the connecting rod (4) in an oven to a temperature of 177° - 260°C (350° - 500°F). Never use a direct flame to heat a connecting rod.6. Put connecting rod (4) in position on the base plate of tooling (C). Put a new rod pin bearing (6) on the adapter part of tooling (C). The old bearing is pushed out by tooling (C) as the new bearing is installed.7. Use tooling (C) to push the new bearing into the connecting rod until the push