812815A97 Mercury POWERHEAD ASSEMBLY

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 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 .
Illustration 1 g01345358
Connecting the 7X-1695 Cable As to an ADEM III ECM
Illustration 2 g01345359
Connecting the 7X-1695 Cable As to an ADEM IV ECM
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:Note: Refer to Illustration 1 or 2. The 170-3519 Harness can be connected to the P1 connector or to the P2 connector. Select the connector with the easiest access.Refer to Table 4. 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 4
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     24    
Yellow     23     36     25    Disregard the pin-outs on the label of the harness. Install the white wire of the 170-3519 Harness into the appropriate location.Install the yellow wire of the 170-3519 Harness into the appropriate location.Note: Ensure that each wire is installed into the correct location. The timing calibration will not be successful if the wires are installed incorrectly.Connect the 7X-1695 Cable As to the connector for timing calibration and to the transducer.Continue to the next Test Step.
Start the Engine and Ch