3056E Industrial Engine Caterpillar

Finding Top Center Position for No. 1 Piston

Usage:

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Table 1
Required Tools
Part Number	Part Description	Qty
-	Temporary Pointer	1

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Illustration 1	g01241391
The engine that is shown may not reflect your application. Setting top center position (1) Temporary pointer

Fasten a temporary pointer (1) to the front of the front cover. Put the tip of the pointer close to the edge of the damper on the crankshaft or close to the edge of the pulley.
Remove the fuel injection nozzles and the valve mechanism cover. Refer to Disassembly and Assembly, "Fuel Injection Nozzles - Remove" and Disassembly and Assembly, "Valve Mechanism Cover - Remove and Install".
Rotate the crankshaft clockwise when you face the front of the engine. Rotate the crankshaft until the pushrod for the inlet valve of the rear cylinder begins to tighten.
Note: Be careful when you rotate the crankshaft. The number one inlet valve will be held in position on top of the piston. If the crankshaft is not positioned properly, the valve may fall from the cylinder head.
Rotate the crankshaft further by 1/8 of a turn in a clockwise direction. Insert a suitable lever between the rocker lever and the valve spring cap of the number one inlet valve. Open the inlet valve. Insert a spacer that is approximately 5 mm (0.2 inch) thick between the valve stem and the rocker lever.
Slowly rotate the crankshaft in a counterclockwise direction until the piston makes contact with the open valve. Make a temporary mark on the damper or the pulley in order to align accurately with the tip of the pointer.
Rotate the crankshaft in a clockwise direction by one or two degrees. Remove the spacer that is between the valve stem and the rocker lever. Rotate the crankshaft by 1/4 of a turn in a counterclockwise direction. Insert a spacer that is approximately 5 mm (0.2 inch) thick between the valve stem and the rocker lever of the No. 1 inlet valve.
Slowly rotate the crankshaft clockwise until the piston makes contact with the open valve. Make another temporary mark on the damper or the pulley in order to align accurately with the tip of the pointer.
Make a temporary mark at the center point between the two marks on the damper or the pulley. Remove the other two marks. Rotate the crankshaft by 1/8 of a turn in a counterclockwise direction. Remove the spacer between the valve stem and the rocker lever.
Slowly rotate the crankshaft in a clockwise direction until the mark on the damper or the pulley, which was made in Step 8, aligns with the tip of the pointer. The number one piston is now at the top center on the compression stroke.
After establishing the number one piston is at the top center on compression stroke. Carry out necessary procedures that are required.
Install the fuel injection nozzles and the valve mechanism cover. Refer to Disassembly and Assembly, "Fuel Injection Nozzles - install" and Disassembly and Assembly, "Valve Mechanism Cover - Remove and Install".
Remove the temporary pointer (1) from the front of the front cover.