Installation Instructions for the Engine Oil Lines Group for the Hydraulic Electronic Unit Injector (HEUI) Pump{1307, 1714} Caterpillar

Machine Engine:

3126B (S/N: 5GG1-UP)

3126B (S/N: BMA1-UP)

Industrial Engines:

3126B (S/N: BEJ1-UP)

Marine Engines:

3126B (S/N: 3GS1-UP)

Introduction

A new steel engine oil lines group is available for the engines that are listed above. The Engine Oil Lines Group is available for repair of the flexible high pressure oil line that is on the Hydraulic Electronic Unit Injector Pump. The engine oil lines group is adaptable to the serial numbers that are listed above. The engine oil lines group is effective with the following serial numbers: 5GG6100-UP, BEJ6915-UP and 3GS2119-UP.

Removal of the Flexible Oil Line

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Illustration 1	g01068766
Inlet fuel line (fuel transfer pump to cylinder head) (1) Connector (2) Hose assembly (3) Fuel transfer pump

1. Remove connector (1) and hose assembly (2) from the fuel transfer pump (3). Refer to Illustration 1. Retain these parts for the reinstallation.

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Illustration 2	g01068729
Outlet fuel line (fuel transfer pump to secondary fuel filter) (4) Adapter (5) Tee (6) Elbow (7) Hose assembly

2. Remove adapter (4), tee (5), elbow (6), and hose assembly (7) from the fuel transfer pump (3). Refer to Illustration 2. Retain these parts for the reinstallation.

   Note: Modifications to the tools may need to be made in order to reduce interference with engine components. Refer to Illustration 3.

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Illustration 3	g01007381
Modified 2P-5494 crowfoot wrench

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Illustration 4	g01068745
(3) Fuel transfer pump (8) Bolt (9) Bolt (10) Washer (11) Adapter (15) HEUI pump (21) Clip

3. Remove the bolt (8) and the clip (21) from the top of the fuel transfer pump. Refer to Illustration 4.

4. Remove the bolt (9) and the washer (10) from the bottom of the fuel transfer pump (3). Refer to Illustration 4.

5. Remove fuel transfer pump (3). Refer to Illustration 4.

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Illustration 5	g01068776
(12) 45 ° adapter (13) Hose assembly (14) Straight connector (15) HEUI pump

6. Remove hose assembly (13) from 45 degree adapter (12) and straight connector (14) by using removal tool (A). Refer to Illustration 5.

7. Remove 45 degree adapter (12) from the HEUI pump (15). Remove straight adapter (14) from the cylinder head. Discard the parts. Refer to Illustration 5.

Installation of the Engine Oil Lines Group

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Illustration 6	g01068779
(16) 247-3755 Tube As (17) 6V-8636 Connector (18) 221-3494 O-Ring Seal (19) 214-7568 O-Ring Seal (20) 6V-8724 Elbow

1. Apply a light coat of oil to the O-rings (18) and (19) during installation. Install the O-ring (18) on the connector (17). Install the O-ring (19) on the connector (17). Thread the connector (17) into the port on the cylinder head by hand. Refer to Illustration 6. Tighten to 48 + 5 N·m (35 + 4 lb ft).

2. Apply a light coat of oil to the O-rings (18) and (19) during installation. Install the O-ring (18) on the elbow (20). Install the O-ring (19) on the elbow (20). Refer to Illustration 7.

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Illustration 7	g01068791
(17) 6V-8636 Connector (18) 221-3494 O-Ring Seal (19) 214-7568 O-Ring Seal (20) 6V-8724 Elbow

3. Back off the jam nut on the elbow (20) to the top of the threads on the elbow assembly (20). Push the washer tightly against the jam nut. Check that the washer is as tight as possible. Thread the elbow assembly (20) into the port of the HEUI pump (15). Hand tighten the elbow (20) into the port of the HEUI pump until the washer is tight against the HEUI pump (15). Unscrew the elbow assembly (20) no more than one complete turn to 18 degrees. Refer to Illustration 8 and Illustration 7.

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Illustration 8	g01068780
(3) Fuel transfer pump (8) Bolt (9) Bolt (10) Washer (15) HEUI pump (18) O-Ring seal (19) O-Ring seal (20) Elbow (21) Clip

4. Align the tube assembly (16) with the connector (17) and the elbow (20). Loosely thread each end of the tube assembly (16) onto the connector (17) and the elbow (20). Position the elbow (20) in order to not create stress in the tube assembly (16) .

5. Hand tighten both connections on the tube assembly (16) .

   Note: Ensure that there is no stress on the tube assembly (16) from any components or fittings.

6. Use a wrench to prevent the elbow assembly (20) from turning. Tighten the bottom tube fitting to the elbow assembly (20) to 40 + 4 N·m (29.5 + 3 lb ft).

7. Use a wrench in order to prevent the connector (17) from turning. Tighten the top tube fitting to the connector (17) to 40 + 4 N·m (29.5 + 3 lb ft).

8. Use a wrench to prevent the elbow assembly (20) from turning. Tighten the jam nut of the elbow assembly (20) to the HEUI pump to 24 + 2 N·m (18 + 1.5 lb ft).

9. Reinstall the fuel transfer pump (3) .

10. Insert the bolt (9) and washer (10) into the bottom hole of the fuel transfer pump and into the HEUI pump (15) .

11. Insert the bolt (8) and the clip (21) into the top hole of the fuel transfer pump (3) and into the HEUI pump (15) .

12. Reinstall the outlet fuel line by assembling the adapter (4), the tee (5), the elbow (6), and the hose assembly (7) .

13. Reinstall the inlet fuel line by assembling the connector (1) and hose assembly (2) .

14. Check all fluid levels. Fill all fluids to the proper level.

15. Clean up any fluids from the assembly process. Run the engine in order to check for leaks. Repair any fittings that may be leaking.