PISTON 5I7792 - Caterpillar

The Electronic Control Module (ECM) can compensate for mechanical differences between the Top Center (TC) of the flywheel and the TC of the timing gear on the camshaft.A 637-13 Engine Timing Sensor : Calibration Required code is activated if a timing calibration is required.Note: A 637-11 Engine Timing Sensor : Other Failure Mode will be generated if there is more than 3 degrees of offset between the signals from the engine speed/timing sensors. Misalignment of the gear train involving the crank and camshaft gear can cause this code.TC of the Flywheel - The ECM determines the TC of the flywheel via a signal from a magnetic transducer. The transducer is installed into the side of the engine block. The transducer creates a signal as a notch on a crankshaft counterweight rotates past the transducer.TC of the Timing Gear - The ECM determines the TC of the timing gear by signals from the engine speed/timing sensors.Any offset between the TC of the flywheel and the TC of the timing gear is stored into the memory of the ECM.Note: A timing calibration will not increase the available engine power.Table 1 lists the special tools that are required in order to perform this procedure.
Table 1
Required Special Tools    
Part Number    Description    
7X-1171     Transducer Adapter    
6V-2197     Transducer    
7X-1695     Cable As    
170-3519     Harness (1)    
( 1 ) This item is not required if the engine harness has a connector for timing calibration.
Install the Transducer Adapter.
Remove the electrical power from the ECM.
Use the appropriate engine turning tool to put either the No. 1 piston or the No. 6 piston at top center. Refer to the Systems Operation/Testing and Adjusting.
Refer to Table 2. After the top center position has been located, rotate the crankshaft for the number of degrees that is applicable to your engine model. Be sure to rotate the crankshaft in the direction of rotation that is specified in the Table.
Table 2
Crankshaft Rotation    
Engine Model     Number of Degrees    Direction of Rotation    
C7     100     Normal Rotation    
C9     85     Normal Rotation    
C13     75     Normal Rotation    
C15     60     Opposite Normal Rotation    
Refer to Table 3. Locate the timing calibration port of the engine.
Table 3
Location of the Timing Calibration Port    
Engine Model    Crankshaft Counterweight    Engine Location    
C7     3     Left Side    
C9     3     Left Side    
C13     8     Left Side    
C15     2     Left Side    
Remove the plug from the timing calibration port.
Thread the transducer adapter into the port.Continue to the next test step.
Install the Transducer.
If the crankshaft is not in the correct position when the transducer is installed, the transducer will be damaged when the engine is started.
Apply clean engine oil to a 2D-6392 O-Ring Seal . Install the O-ring seal on the end of the 6V-2197 Transducer .
Push the transducer