3408 & 3408B DIESEL TRUCK ENGINE Caterpillar

1. Cut governor safety wire (1).

2. Disconnect line (3) from the fuel ratio control.

3. Remove the two bolts and fuel ratio control (2).

Install Fuel Ratio Control

1. Put fuel ratio control in position. Make an alignment of opening (slot) (2) with the plunger in the fuel ratio control.

2. Use 9S3263 Thread Lock and install the two bolts that hold fuel ratio control (1) to the governor plate.

3. Connect line (3) to the fuel ratio control.

4. Install a new lockwire and seal. See FUEL RACK SETTING in TESTING AND ADJUSTING.

Disassemble Fuel Ratio Control

start by:

a) remove fuel ratio control

1. Remove two bolts (1) and cover (2).

2. Remove valve assembly (3).

3. Remove seal (4) and the O-ring seal from the valve assembly.

4. Remove retainer (5) and two springs (6).

5. Remove the three bolts from the cover. Remove cover (12) and gasket (11).

6. Remove valve (13), diaphragm, (8), retainer (9) and spring (10).

7. Remove pin (14) from valve (13).

8. Remove cover (7) from the valve.

Assemble Fuel Ratio Control

1. Put clean SAE 30 oil on the seal. Install seal (1) in cover (2) with the lip of the seal toward the inside of the cover.

2. Install valve (3) in cover (2).

3. Install the pin that holds the cover on the valve.

4. Install the spring and the retainer in cover (6).

5. Install diaphragm (5) on the valve assembly (4) and in the cover.

6. Install cover (8). Install three bolts (7) that hold the cover in position.

7. Put clean SAE 30 oil on the seal and the ring seal. Install seals (11) on valve.

8. Install two springs (12), retainer (13) and valve assembly (10).

9. Install housing (9) and the bolts.

end by:

a) install fuel ratio control