862087A 1 Mercruiser BELT, Serpentine

The ECM has the ability to compensate for mechanical differences between the Top Center (TC) of the flywheel and the TC of the timing gear on the camshaft.An "Engine Timing Calibration Not Performed" code is activated if a timing calibration is required.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 2 lists the special tools that are required in order to perform this procedure.
Table 2
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 the top center. Refer to the Systems Operation/Testing and Adjusting.
Refer to Table 3. 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 3
Crankshaft Rotation
Engine Model Number of Degrees Direction of Rotation
C7 100 Normal Rotation
C-9 85 Normal Rotation
C9.3 85 Normal Rotation
C-10 60 Opposite Normal Rotation
C11 75 Normal Rotation
C-12 60 Opposite Normal Rotation
C13 75 Normal Rotation
C-15 60 Opposite Normal Rotation
C-16 60 Opposite Normal Rotation
C18 30 Opposite Normal Rotation
Refer to Table 4. Locate the engines timing calibration port.
Table 4
Location of the Timing Calibration Port
Engine Model Crankshaft Counterweight Engine Location
C7 3 Left Side
C-9 3 Left Side
C9.3 3 Left Side
C-10 8 Right Side
C11 8 Left Side
C-12 8 Right Side
C13 8 Left Side
C-15 2 Left Side
C15 2 Left Side
C-16 2 Left Side
C18 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 through the transducer adapter until the transducer contacts the crankshaft counterweight.
Withdraw the transducer 1.0 mm (0.04 inch) and hand tighten the nut on the adapter sleeve in order to secure the transducer. Move the O-ring seal against the adapter.Continue to the next test step.
Connect the 7X-1695 Cable as.
If the engine harness is equipped with a connector for timing calibration, connect the 7X-1695 Cable as to the connector for timing calibration and to the transducer.
If the engine harness is not equipped with a connector for timing calibration, perform the following procedure:Disconnect the P2 connector from the ECM.Determine the number of terminals on the P2 connector.Refer to Table 5. Remove the sealing plugs from the appropriate terminals. Do not discard the sealing plugs. The sealing plugs may be reinstalled when the timing calibration is complete.
Table 5
Locations for Connection of the 170-3519 Harness
Wire Color Locations on the 70−pin P2 Connector Locations on the 120−pin P2 Connector Locations on the P1 Connector
White 22 26