3406 INDUSTRIAL & MARINE ENGINES Caterpillar


Fuel Injection

Usage:

Camshaft rotation counterclockwise in view shown.

Firing order (injection sequence) ... 1, 5, 3, 6, 2, 4

Injection timing before TC (top center):

Precombustion Chamber (PC) ... 10 ± 1°

Direct Injection (DI) ... 28 ± 1°

(1) Torque for bushing ... 150 ± 10 lb. ft.(205 ± 14 N·m)


A-8S7167 GAUGE

(5) Bore for the rack and diameter of the rack:

Bearing at the rear (new) ... .5018 ± .0018 in.(12.746 ± 0.046 mm)

Bearing at the front (new) ... .5023 ± .0018 in.(12.758 ± 0.046 mm)

Diameter of fuel rack (new) ... .4985 ± .0002 in.(12.662 ± 0.005 mm)

Maximum permissible clearance between rack and bearings (worn) ... .007 in.(0.18 mm)

(6) Bore in bearings for the camshaft (new) ... 2.1255 ± .0015 in.(53.988 ± 0.038 mm)

Diameter of bearing surfaces of the camshaft (new) ... 2.1220 ± .0005 in.(53.899 ± 0.013 mm)

Maximum permissible clearance between the bearings and the camshaft ... .010 in.(0.25 mm)


PRECHAMBER

(9) Torque for all nuts that hold the fuel lines ... 30 ± 5 lb. ft.(40 ± 7 N·m)

(10) Torque for the nuts that hold the nozzles ... 55 ± 5 lb. ft.(75 ± 7 N·m)

(11) Body.

(12) Nozzle. Tighten nozzle finger tight on body (11).


DIRECTION INJECTION

(13) Torque for precombustion chamber or direct injection adapter ... 150 ± 10 lb. ft.(205 ± 14 N·m)

(14) Torque for glow plug ... 120 ± 24 lb. in.(13.6 ± 2.8 N·m)

NOTE: Use 5P3931 Anti-Seize Compound on the threads when the precombustion chamber, direct injection adaptor, or glow plugs are installed.

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