885526 75 Mercruiser SCREW, (M8 x 75)

1. Remove bolts (2), nut (3), cover (1) and the gasket from the engine front housing. 2. Remove bolts (4), retainer (5) and automatic timing advance (6) from the engine.Install Automatic Timing Advance
1. Put automatic timing advance (1) in position in the front housing and install the retainer and the bolts. Tighten the bolts finger tight until there is a small amount of friction (slight drag) between the retainer and the timing advance unit. This will prevent movement (backlash) when the gears are turned to the correct timing position. 2. Remove timing bolt (2), cover (3) and plug (4). 3. Use tool (A) to turn the engine in a counterclockwise direction (as seen from the flywheel end of the engine) until timing bolt (2) can be installed into the flywheel. The No. 1 piston must be at top center on the compression stroke. If the hole in the flywheel is turned beyond the hole in the flywheel housing, turn the flywheel back (clockwise) a minimum of 30° beyond the hole in the flywheel before turning counterclockwise toward the hole again. This will prevent a timing error caused by play in the timing gears.4. To see if No. 1 piston is on the compression stroke, look at the valves of No. 1 cylinder. The valves will be closed if No. 1 cylinder is on the compression stroke. You should be able to move the rocker arms up and down with your hand.If No. 1 piston is not on the compression storke, turn the flywheel 360° and install the timing bolt.
Typical Example5. Remove the plug from the front of the fuel injection pump housing. Install tool (B) through the hole in the pump housing. If the timing is correct, tool (B) can be installed into the notch in the fuel injection pump camshaft.6. If tool (B) can not be installed into the notch of the camshaft, remove it and the timing bolt from the flywheel.7. Repeat Step 3 and turn the flywheel an additional 360°. Repeat Step 4.8. Tighten the bolts that hold the automatic timing advance to a torque of 25 N m (18 lb.ft.); then tighten the bolts to a torque of 136 7 N m (100 5 lb.ft.). Remove the timing bolt (2) from the flywheel.9. Turn the engine two complete revolutions and check the timing again. If tool (B) will not go into the notch of the fuel injection pump camshaft, do Steps 1 through 8 again. 10. If a replacement of stud (6) is necessary, put 9S3263 Thread Lock on the threads of the new stud. Install it in the engine front housing until it is 73.2 mm (2.88 in.) above the outside surface.11. Put the gasket and cover (5) on the engine front housing and install the bolts and the nut that hold it.END BY:a) install fan drive and fan belt tightenerDisassemble Automatic Timing Advance
START BY:a) remove automatic timing advance 1. Remove ring (1) and gear assembly (2) from the flange assembly. 2. Remove the slides from the weights.3. Remove springs (4) and weights (3) from the flange assembly.Assemble Automatic Timing Advance
1. Put weights (2) in position in flange assembly (1) as shown.2. Install springs (3) in flange assembly (1). 3. If pistons (6) were removed from the gear assembly because of wear, use new parts for replacement. Install new pistons (6) until they are 11.05 .13 mm (.435 .005 in.) above the inside surface of gear assembly (4). Move the metal (peen) on the outside surface of gear assembly (4) in four places around each piston to hold them in position.4. Use 1P808 General Purpose Lubricant to hold slides (5) in position on gear assembly (4).5. Install gear assembly (4) on flange assembly (1). Make sure slides (5) fit in the grooves of the weights.6. Install the ring that holds gear assembly (4) to the flange assembly.END BY:a) install automatic timing advance