2001/06/01 Caterpillar

Industrial Engines:

3406E (S/N: 6BR1-UP)

3456 (S/N: 3LW1-UP)

C-15 (S/N: BEM1-UP)

C-16 (S/N: BFM1-UP)

Marine Engines:

3406E (S/N: 9WR1-UP)

Generator Set Engines:

3406E (S/N: 8AZ1-UP; 1MZ1-UP)

Specifications, SENR1066-01, "3406E and 3456 Industrial Engines", "Unit Injector Mechanism"Specifications, SENR1167-01, "3406E Marine Engine", "Electronic Unit Injector Mechanism"Specifications, RENR2302-00, "3406E Generator Set Engines", "Electronic Unit Injector Mechanism"Specifications, RENR2348-00, "C-15 and C-16 Industrial Engines", "Electronic Unit Injector Mechanism"

The torque of the adjusting screw locknut for the unit injector has been changed. The torque was 81 ± 10 N·m (60 ± 7 lb ft). The new value for the torque of the adjusting screw locknut has been increased to 100 ± 10 N·m (74 ± 7 lb ft). The new torque should be used only if the unit injectors require adjustment. The change is shown in the text that follows.

Illustration 1	g00545396

(1) Cap nut

Tighten the cap nuts to the following torque. ... 2.5 ± 0.25 N·m (22 ± 2 lb in)

(2) Adjusting screw locknut

Tighten the adjusting screw locknut to the following torque. ... 100 ± 10 N·m (74 ± 7 lb ft)

(3) Unit injector height

Adjust the unit injector height to the following dimension. ... 78.0 ± 0.2 mm (3.07 ± 0.01 inch)

(4) Bolt

Tighten the unit injector clamp retaining bolt to the following torque. ... 55 ± 10 N·m (41 ± 7 lb ft)

(5) Spacer

(6) Unit injector clamp

(7) O-ring seals

Before installation of the unit injector, lubricate the top two O-ring seals with a 50/50 mixture of clean engine oil and 8T-2998 Lubricant .

Note: Refer to Testing and Adjusting, "Electronic Unit Injector - Adjust" for the correct procedure for setting the lash on the electronic unit injector.