850220A 2 Mercury HARNESS ASSEMBLY-ENGINE

The camshaft must be correctly timed with the crankshaft before an adjustment of fuel timing is made. The timing pin must be removed from the camshaft before the crankshaft is turned or damage to the cylinder block will be the result.
Refer to System Operation, Testing and Adjusting, "Crankshaft Posistion for Fuel Timing and Valve Lash Adjustment". Ensure that the engine is in time. This will ensure that the pushrod lifters are off the lobes and on the base circles of the camshaft.
Illustration 1 g00340175
Engine information plate
Note: Refer to the information plate on the engine for the fuel injector's correct fuel timing dimension.
Before a check or an adjustment of the fuel timing can be made, the tooling must be set to the correct dimension. Use the following procedure in order to set the tooling to the correct dimension:
Illustration 2 g00359732
Adjustment of fuel timing tools
(1) 6V-3075 Dial Indicator
(2) 6V-9058 Fixture As
(3) 6V-9056 Setting Gauge
(4) 8S-3675 Indicator Contact Point
Install 8S-3675 Indicator Contact Point (4) on the 6V-3075 Dial Indicator (1).
Install 6V-3075 Dial Indicator (1) in the collet of 6V-9058 Fixture Assembly (2).
Install 6V-3075 Dial Indicator (1) with 6V-9058 Fixture Assembly (2) onto 6V-9056 Setting Gauge (3). Ensure that the magnetic base of the timing fixture is on the top surface and that the contact point is on the bottom step. Note: The 6V-3075 Dial Indicator (1) has two or three dials that register. The larger dial has marks for every 0.01 mm (0.0004 inch). The red numbers on the dial are for minus readings. The black numbers on the dial are for plus readings. The smaller dial has marks for 1.00 mm (0.040 inch) (one complete revolution of the large dial).
Find the correct Fuel Timing Dimension on Table 2 and determine the setting dimension. Note whether the dimension is a plus "+" number or a minus "−" number. Note: If the setting dimension from the chart is "0" or a plus "+" number, move the dial indicator into the collet until both dials register "0". Place the "0" on the large dial in the twelve o'clock position in order to easily read the dial when the dial is on the engine. If the setting dimension is "0" tighten the collet. If the setting dimension is not "0", move the dial indicator farther into the collet until the large dial indicates the correct plus "+" setting. Then, tighten the collet.Note: If the setting dimension is a minus "−" number, move the dial indicator in the collet until both dials register "0". Place the "0" on the large dial in the twelve o'clock position in order to easily read the dial when the dial is on the engine. Now, move the dial indicator out of the collet until the large dial indicates the correct minus "−" setting. Then, tighten the collet.
Illustration 3 g01345878
Fuel timing
(5) Injector retainer
(6) Shoulder on the fuel injector body
(A) Fuel timing dimension
Ensure that the top surface of fuel injector's retainer (5) and shoulder (6) are clean and dry.
Illustration 4 g01345884
Fuel timing tools in position
Typical example
(1) 6V-3075 Dial Indicator
(2) 6V-9058 Fixture As
(7) Rocker arm adjustment screw
(8) Rocker arm adjustment screw locknut
Put 6V-3075 Dial Indicator (1) that is installed in 6V-9058 Fixture Assembly (2) into position on the fuel injector. Make sure that the magnetic base of the timing fixture is on the top surface of the fuel injector's retainer and that the contact point is on the top surface of shoulder (6). Note: The pointer on both dials on the dial indicator must indicate 0.00 0.20 mm (0.000 0.008 inch).
If the dial indicator pointers are within the range of 0.00 0.20 mm (0.000 0.008 inch), no adjustment is necessary. Proceed to Step 11.
If the dial indicator pointers are not within the range of 0.00 0.20 mm (0.000 0.008 inch), complete Steps 7 through 10.
Loosen the rocker arm adjustment screw locknut (8) on the fuel injector that requires adjustment.
Put 6V-3075 Dial Indicator (1) that is installed in 6V-9058 Fixture Assembly (2) into position on the fuel injector. Make sure that the magnetic base of the timing fixture is on the top surface of the fuel injector's retainer and that the contact point is on the top surface of shoulder (6).
Turn rocker arm adjustment screw (7) until the dial indicator indicates "0".
Tighten rocker arm adjustment screw locknut (8) to a torque of 200 25 N m (150 18 lb ft), and check the adjustment again. If necessary, do this procedure until the adjustment is correct.
Remove the timing pin from the crankshaft when the fuel timing check is completed.
Table 2
Dial Indicator Setting Chart(1)
Fuel Timing Dimension Setting
119.60 mm +1.40 mm
119.50 mm +1.30 mm
119.40 mm +1.20 mm
119.30 mm +1.10 mm
119.20 mm +1.00 mm
119.10 mm +0.90 mm
119.00 mm