822778A 3 Mercury DOWN PRESSURE KIT


822778A 3 DOWN PRESSURE KIT Mercury 1031203PD, 1031203UB, 1031203UD, 1031207ZF, 1031312DB, 1040213YL, 1041312UB, 10432037D, 1043203DD, 1043203VD, 1043213DD, 1043302DD, 1043411DD, 1043412DB, 1043412DD, 1050302DB, 1050302FB, 1050302FD, 1050312FB, 1050411DD, 1050412DB, 1050412DD, 1050412F DOWN
822778A 3 DOWN PRESSURE KIT Mercury
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Mercury entire parts catalog list:

1031203PD 1994,1995,1996,1997,1998,1999
1031203UB 1998,1999,2000,2001,2002,2003,2004
1031203UD 1998,1999
1031207ZF 2002
1031312DB 2005,2006
1040213YL 2001,2004
1041312UB 1998
10432037D 1997,1998
1043203DD 2005
1043203VD 1999,2000,2001,2002,2003,2004
1043213DD 2005
1043302DD 2005
1043411DD 2005
1043412DB 2005
1043412DD 2005
1050302DB 2005
1050302FB 2006
1050302FD 2006
1050312FB 2006
1050411DD 2005
1050412DB 2005
1050412DD 2005,2006
1050412FB 2006
1050412FD 2006,2010
1055207DB 2005,2006
1055207UD 1998
1055207VB 1999,2000,2001,2002,2003,2004
1075217DD 2005
1075217FD 2006
1075217PD 1994,1995,1996,1997,1998
1075217VD 1999,2000,2001,2002,2003,2004
10752L7DF 2005
10752L7FF 2006
1075317DB 2005
1075317FB 2006
1075412DB 2005
1075412DD 2005
1075412DN 2005
1075412FB 2006
1075412FY 2006
1090412DB 2005,2006
1090412DC 2005
1090412DD 2005
1090412DN 2005
1090412DY 2005,2006
1090412FF 2010
1090412FY 2006
1090422DY 2005
1090422FF 2010
1090472DD 2005
1090472FF 2010
1090472FY 2006
1100412PD 1994,1995,1996,1997,1998
1100412VB 1999,2000,2001,2002,2003,2004
1115412DB 2005,2006
1135V13ED 2006,2007
1135V13FB 2006
1135V13HB 2006
1B25203ZB 2002,2003,2004,2005,2006
1F25201UD 1998
1F25203VD 1999,2000,2001
1F30203VD 1999,2000,2001
1F30203ZB 2002,2003,2004,2005
1F40203FD 2006
1F40203HZ 2006
1F40213FZ 2006
1F40452YB 2001
1F41452YD 2001,2002
1F50352VD 1999,2000
1F50412RD 1995,1996,1997,1998
1F51452YB 2001

Information:

Low Fuel Pressure
Low fuel pressure can cause low power. Low fuel pressure can also cause cavitation of the fuel which can damage the fuel injectors. The following conditions can cause low fuel pressure:
Plugged fuel filters
Debris in the check valves for the fuel priming pump (if equipped)
Sticking or worn fuel pressure regulating valve in the fuel transfer pump
Severe wear on return fuel pressure regulating valve at the rear of the cylinder head
Worn gears in the fuel transfer pump
Pinched fuel lines or undersized fuel lines
Old fuel lines that have a reduced interior diameter that was caused by swelling
Fuel lines with deteriorating interior surfaces
Pinched fuel line fittings or undersized fuel line fittings
Debris in the fuel tank, fuel lines, or fuel system components that create restrictionsHigh Fuel Pressure
Excessive fuel pressure can cause fuel filter gaskets to rupture. The following conditions can cause high fuel pressure:
Plugged orifices in the fuel pressure regulating valve
Stuck fuel pressure regulating valve in the fuel transfer pump
Pinched fuel return lineChecking Fuel Pressure
Illustration 1 g00293196
1U-5470 Engine Pressure Group Refer to Special Instruction, SEHS8907, "Using The 1U-5470 Engine Pressure Group".
Fuel leaked or spilled onto hot surfaces or electrical components can cause a fire. Clean up fuel spills immediately.
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Use the following procedure to measure the fuel pressure after the secondary filter:Note: Fuel pressure readings near the fuel supply manifold have pressure spikes. The pressure spikes are caused by excess fuel that is returning to the fuel system from the injectors. Excessive needle movement at the gauge may be present. Connect the gauge with a section of suitable hose. The air in the hose absorbs the spikes. This gives an average reading and a steady needle. Keep the gauge above the measuring point.
Illustration 2 g00945275
(1) PlugInstall the 1U-5470 Engine Pressure Group into port (1) .During both normal operating conditions and load conditions, the fuel pressure should register the following range:
455 to 579 kPa (66 to 84 psi)At low idle, the fuel pressure at the fuel filter's inlet should be at the following amount:
400 to 434 kPa (58 to 63 psi)The fuel pressure to the fuel gallery should be the same amount, if you subtract the change in pressure (delta P) across the filter. With a new filter, the pressure drop across the fuel filter typically registers the following amount:
35 kPa (5 psi)As deposits collect on a fuel filter, the pressure differential will increase. Engine misfire may occur if the fuel pressure in the fuel gallery decreases to approximately 69 kPa (10 psi).The fuel pressure regulator valve is mounted at the fuel return port at the rear of the fuel gallery in the cylinder head. The fuel pressure regulating valve maintains fuel pressure at low engine rpm. The regulating valve also contains a spring loaded check valve. The spring loaded check valve prevents the fuel from draining from the fuel gallery back to the fuel tank after engine shutdown.Unit Injector Hydraulic Pump (Test)
Injection Actuation Pressure (Test)
The test for injection actuation pressure is used in order to check for the following conditions:
The unit injector hydraulic pump is producing maximum pressure.
The pump pressure regulator is working properly.
The unit injector hydraulic pump is worn.
System leaksThe Caterpillar Electronic Technician (Cat ET) is used to perform this test.Dead Head Test for the Unit Injector Hydraulic Pump
The unit injector hydraulic pump dead head test is used to verify that the following conditions exist:
The injection actuation pressure circuit is working.
The unit injector hydraulic pump is working properly.
Illustration 3 g00749695
High pressure line
Table 1
Required Tools    
Part Number     Part Name     Quantity    
125-2580     Tool Group For HEUI     1    To check the pressure for the unit injector hydraulic pump, remove the pump outlet line (1) from the pump. Install the appropriate gauge from the 125-2580 Tool Group For HEUI . The gauge to use should have a range that would include 34 MPa (5000 psi).Note: Be sure to install a cap or plug the fitting that goes into the high pressure oil gallery.Crank the engine for approximately 3 seconds in order to get the maximum pressure.If the recorded pressure is less than 26.5 MPa (3850 psi), the pump should be replaced.If the recorded pressure is equal


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