81887M Mariner PIN, PIVOT SHAFT

Procedure for Fuel Priming
Illustration 1 g00294863
Fuel system components (left side view) (1) Fuel return line from the cylinder head (2) Fuel priming pump (3) Fuel filter base (4) ECM (5) Fuel supply line to the cylinder head (6) Fuel transfer pump (7) Fuel filter (8) Air purge cap
Illustration 2 g00294865
Fuel system components (front view) (9) Air purge plug (10) Fuel return (11) Fuel inletNote: If the fuel system runs dry of fuel or air is introduced into the system, the following procedure must be followed.
Loosen the air purge cap (8) .
Unlock and operate the fuel priming pump (2) until fuel appears at the air purge cap (8) . Tighten the air purge cap (8) .
Loosen the air purge plug (9) for two turns. Continue operating the fuel priming pump (2) until fuel appears at the air purge plug (9) . Tighten the air purge plug (9) .
Continue operating fuel priming pump (2) until a resistance is felt. Push in and lock the hand priming pump.
Once the system is pressurized, crank the engine as soon as possible. The engine should start within 15 seconds. If the engine does not start after 30 seconds, stop cranking the engine. A period of 2 minutes is needed for the starter to cool before proceeding.
If the engine does not start, repeat the procedure.Fuel System Inspection
A problem with the components that send fuel to the engine can cause low fuel pressure. This can decrease engine performance.
Check the fuel level in the fuel tank. Check the vent in the cap for the fuel tank for dirt.
Check the fuel lines for fuel leakage. Check the fuel lines for a worn bend or a restriction. Check that the fuel return line has not collapsed within the sections that are exposed to heat.
Install a new fuel filter.
Remove any air that may be in the fuel system. Refer to the topic "Procedure for Fuel Priming" in this service manual.Fuel System Pressure
The typical fuel pressure of the engine at operating temperature can vary. At low idle, the fuel pressure can be 538 kPa (78 psi). At high rpm, the fuel pressure can be 641 kPa (93 psi).The performance of the unit injector deteriorates when the fuel pressure drops below 241 kPa (35 psi). Low-power complaints and erratic operation can occur in this situation. Check for a plugged fuel filter or air in the fuel lines as possible causes for these complaints before replacing fuel system components.Fuel Pressure
Table 1
Required Tools    
Part Number     Part Name     Quantity    
1U-5470
or
198-4240     Engine Pressure Group
or
(Indicator Group)     1    
Illustration 3 g00294866
1U-5470 Engine Pressure Group To check the fuel transfer pump pressure, remove the plug from the fuel filter base. Install a pressure gauge, and start the engine.The 1U-5470 Engine Pressure Group can be used to check the fuel pressure of the engine. The engine pressure group includes Special Instruction, SEHS8907. This instruction provides information about the usage of the group.Unit Injector Adjustment
Table 2
Required Tools    
Part Number     Part Name     Quantity    
9U-7227     Injector Height Gauge     1    
Illustration 4 g00294868
Injector mechanism (1) Rocker arm (2) Adjusting screw (3) Locknut (4) 9U-7227 Injector Height Gauge To make an adjustment to the unit injector, turn the adjusting screw in the rocker arm. The unit injector adjustment can be made by using the procedure that follows:
Put the number 1 piston at top center (TC) on the compression stroke. Refer to "Top Center Position For Number 1 Cylinder".
The fuel injector tool (4) is used to obtain a dimension of 78.0 0.2 mm (3.07 0.01 inch). The dimension is measured from the top of the unit injector lifter to the machined ledge of the fuel injector body.
Hold the adjusting screw in this position and tighten the locknut (3) to a torque of 100 10 N m (74 7 lb ft).
Make an adjustment to the unit injectors on cylinders 3, 5, and 6.
Remove the timing bolt. The flywheel is then turned 360 degrees in the direction of engine rotation. The direction of engine rotation is a counterclockwise direction. This will put No. 1 piston at top center (TC) on the exhaust stroke.
Make an adjustment to the unit injectors on cylinders 1, 2, and 4.
Remove the timing bolt from the flywheel after all the unit injector adjustments have been made. Reinstall the timing cover.Checking Engine Cylinders Separately
The engine utilizes Unit Injectors, which are mechanically actuated and electronically energized. The ECAP