Perkins 1106 — Finding Top Center Position for No. 1 Piston

For the Perkins 1106.

Applies to: Perkins 1106

Procedure

1. 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.
2. Remove the fuel injection nozzles and the valve mechanism cover.
3. 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.
4. 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 No. 1 inlet valve. Open the inlet valve. Put a spacer that is approximately 5 mm (0.2 inch) thick between the valve stem and the rocker lever.
5. 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.
6. 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. Put a spacer that is approximately 5 mm (0.2 inch) thick between the valve stem and the rocker lever.
7. 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.
8. 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.
9. Slowly rotate the crankshaft in a clockwise direction until the mark on the damper or the pulley, which was made in the previous step, aligns with the tip of the pointer. The No. 1 piston is now at the top center on the compression stroke.
10. Install the valve mechanism cover and the fuel injection nozzles.
11. Remove the temporary pointer (1) from the front of the front cover.

Source: manual:1106C System Operation Manual.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.