C7 Engines for Caterpillar Built Machines Finding Top Center Position for No. 1 Piston Caterpillar


Finding Top Center Position for No. 1 Piston
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C7 Engines for Caterpillar Built Machines [SENR9939]
BASIC ENGINE
VALVE MECHANISM GP
3126B Engines Engine Valve Lash - Inspect/Adjust
C7 Engines for Caterpillar Built Machines Finding Top Center Position for No. 1 Piston

Table 1
Required Tools 
Tool  Part Number   Part Name  Qty 
136-4632  Timing Pin 
139-7063  Timing Pin Adapter 
178-8615 or 350-7549  Engine Turning Tool 


Illustration 1g01134341
(1) Plug for the timing hole

Note: Refer to Troubleshooting Guide, "Engine Speed/Timing Sensor - Calibrate".

  1. Remove plug (1) from the flywheel housing. Insert Tooling (A) through the timing hole in the flywheel housing.

    Note: If necessary, use Tooling (B) to adapt the timing pin to a larger timing hole.

  2. Carefully thread the pin assembly into the flywheel housing. Release the lock that is on the handle of the tool in order to allow the pin to locate the timing hole that is in the flywheel.

  3. Use Tooling (C) in order to turn the engine in the direction of normal engine rotation. Normal engine rotation is counterclockwise, as the engine is viewed from the flywheel end.

    Note: Tooling (C) uses the bolts on the front of crankshaft.

  4. Slowly turn the flywheel until Tooling (A) engages with the hole that is in the flywheel.

    If the flywheel has been turned beyond the point of engagement, use the following procedure to readjust the flywheel and try again:

    1. Retract the pin for Tooling (A) and lock the tool in the retracted position.

    2. Turn the flywheel in the direction that is opposite of normal engine rotation. Rotate the engine past the timing hole by at least 30 degrees.

    3. Unlock Tooling (A) in order to locate the timing hole that is in the flywheel. Turn the flywheel in the direction of normal engine rotation until the timing pin engages into the timing hole that is in the flywheel.

  5. Use the following procedure in order to determine the stroke position of the no. 1 piston:

    1. Remove the valve mechanism cover.

    2. Check the positions of the inlet valves and the exhaust valve for the no. 1 piston.

      The no. 1 piston will be in the compression stroke if the following conditions are satisfied:

      • No. 1 piston inlet valves and the exhaust valve is fully closed.

      • No. 1 piston rocker arms can be moved by hand.

      If these conditions are not met, use the same conditions to check the stroke position of the no. 6 piston. If the no. 6 piston is in the compression stroke, rotate the flywheel for an additional 360 degrees in order to place the no. 1 piston in the compression stroke.

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