2012/10/08 Caterpillar

Generator Set:

C27 GEN SET (S/N: DWB1-UP)

C32 GEN SET (S/N: K7C1-UP; SXC1-UP; JSJ1-UP)

Power Module:

C32 POWER MODUL (S/N: MED1-UP)

Description of Change: Check valves are added to the fuel start system to aid the starting of engines that have not run for long periods of time.

Adaptable To: The new changes are adaptable back to the first production of the listed engines.

The change is effective at the factory with the engine serial numbers that are listed in Table 1.

Table 1

Effective Serial Numbers

(S/N: DWB03292-UP)

(S/N: JSJ02915-UP)

(S/N: K7C00524-UP)

(S/N: SXC92003-UP)

(S/N: MED00197-UP)

Refer to the procedure that follows to install check valves into the fuel block and fuel filter base.

Procedure to Install Check Valves into the Fuel Block

Show/hide table

Fuel leaked or spilled onto hot surfaces or electrical components can cause a fire. Clean up fuel spills immediately.

Show/hide table

NOTICE
Keep all parts clean from contaminants. Contaminants may cause rapid wear and shortened component life.

Show/hide table

NOTICE
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, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products. Dispose of all fluids according to local regulations and mandates.

Note: Lock Out and Tag Out of the generator is applicable.

Note: Ensure that health and safety requirements are adhered to at all times.

1. Open the generator set breaker

2. Put the 4-position start switch "ESC" into the off position on Electronic Modular Control Panel (EMCP2) or push the stop button on the EMCP3.

3. Activate the emergency stop.

4. Isolate the AC auxiliary voltage for the battery chargers, the coolant heaters, the generator space heaters, and then disconnect the battery cable.

5. Pull the suction tube out of the fuel tank and cap the end.

6. Connect a vacuum pump to the supply line going to the fuel transfer pump.

7. Vacuum test the whole supply side of the fuel system. The vacuum pump should maintain vacuum and not allow leak down. Repair any leaks.

8. Disconnect the right and left cylinder fuel return hoses from the fuel block (3) .

Show/hide table



Illustration 1	g03274438
(1) 420-1793 Check Valve (2) 214-7568 O-Ring Seal

Show/hide table



Illustration 2	g03274577
(3) Fuel block

9. Install the o-ring seals (2) onto the check valves (1)

10. Install the two check valves (1) directly into the fuel block (3) where the right and left cylinder fuel return hoses were connected.

11. Reconnect the return line hoses to the installed check valves in the fuel block.

Procedure to Install a Check Valve into the Fuel Filter Base

Illustration 3	g03274921
Current 90 degree elbow

Show/hide table



Illustration 4	g03274616
(4 ) Fuel filter base (5) 420-1796 (6) 8M-0547 Flared Elbow

1. Remove the fuel line and the current 90 degree 118-4728 Elbow on the outlet side of the fuel filter base (4) .

Show/hide table



Illustration 5	g03275136
(5) 420-1796 Check Valve

2. Add the 238-5080 O-Ring Seal to the 420-1796 Check Valve (5)

3. Mount the 420-1796 Check Valve (5) to the outlet side of the fuel filter base (4) .

Show/hide table



Illustration 6	g03275028

4. Attach the 8M-0547 Flared Elbow (6) to the 420-1796 Check Valve .

5. Reattach the outlet fuel line to the new elbow.

6. Return the engine to service and check for fuel leaks.