11979 Mercruiser ROCKER COVER (RIGHT)

start by: a) remove fuel injection nozzles Do not disassemble any nozzle until testing has shown that disassembly is needed. Check each nozzle with tool (A) for leakage, opening pressure, and the shape and amount of fuel (spray pattern) coming out of the nozzle. Do not clean or make an adjustment to any nozzle that has a large (excessive) amount of return leakage. Excessive return leakage can be an indication of nozzle failures that can not be corrected with an adjustment or cleaning and can cause engine damage. See TESTING 9L7883 FUEL INJECTION NOZZLES in TESTING AND ADJUSTING.
Keep the work area and all tools extra clean. Be careful not to cause damage to the parts during disassembly and assembly of the nozzles.
1. Put the nozzle in tool (B). Put tool (B) and the nozzle in a vise. Do not put any part of a nozzle directly in a vise. Loosen locknut (1). 2. Loosen adjusting screw (2) approximately three turns. Loosen pressure screw (3). 3. While holding the nozzle in one hand, tilt the nozzle and remove the pressure adjusting screw and locknut, shims, spring, seat, and valve. 4. If the valve does not slide out of the nozzle, install tool (C) and remove valve as follows: a) Push valve into nozzle with tool (C) until valve is against bottom of nozzle.b) Push down on body of tool (C) to engage collet on valve with tool (C).c) Turn nut counterclockwise and remove valve from the nozzle body.5. Put the parts in solvent to loosen carbon and deposits of foreign material. The body is assembled with an epoxy material and must not be in contact with the solvent for more than one to two hours. See SPECIAL INSTRUCTION FORM NO. FM055225 for the correct method of cleaning the nozzle.Assemble Fuel Injection Nozzles (9L7883 Nozzles)
Make sure all of the parts have been thoroughly cleaned before assembling the nozzles. Flush the body to remove any debris or lapping compound.1. Put clean fuel on all of the parts. 2. Put valve (1) in position in the body as shown.3. Install adjusting screw (7) into pressure screw (5). Turn the adjusting screw two or three turns and install locknut (6). Do not tighten the locknut.4. Put shims (4), spring (3), and seat (2) in position on the adjusting screw. The thicker shim of shims (4) must be against the screw.5. Put seat (2) in contact with the valve and push the valve into position in the body. Tighten the pressure screw by hand. 6. Put the nozzle in position in tool (A). Put tool (A) and the nozzle in a vise. Tighten the pressure screw to a torque of 70 to 80 lb.in. (80.7 to 92.2 cm.kg).7. Check the opening pressure of the nozzle as controlled by shims (4) with tool (B). See TESTING 9L7883 FUEL INJECTION NOZZLES, OPENING PRESSURE TEST in TESTING AND ADJUSTING.8. Check the valve lift adjustment as controlled by adjusting screw (7) with tool (B). See TESTING 9L7883 FUEL INJECTION NOZZLES, VALVE LIFT ADJUSTMENT in TESTING AND ADJUSTING. 9. Hold the adjusting screw with a screwdriver and tighten the locknut until the adjusting screw will not turn.10. Tighten the locknut to a torque of 35 to 45 lb.in. (40.4 to 51.9 cm.kg).end by: a) install fuel injection nozzles