D353 INDUSTRIAL & MARINE ENGINES Caterpillar


Fuel Injection Equipment

Usage:

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

Injection timing before TC (top center) ... 12 ± 1°

(1) Length of pump plunger ... 2.9834 ± .0015 in.(75.778 ± 0.038 mm)

Minimum permissible length ... 2.9769 in.(75.613 mm)

(2) Timing dimension for the fuel injection pumps:

On engine (piston at top center) ... 2.090 ± .002 in.(53.09 ± 0.05 mm)

Off engine ... 2.1565 ± .0005 in.(54.775 ± 0.013 mm)

(3) Torque for bolt* ... 32 ± 5 lb. ft.(43 ± 7 N·m)


*Put 8H5137 Sealer on bolt threads.

(4) Diameter of the fuel rack ... .6095 ± .0005 in.(15.481 ± 0.013 mm)

Bore in bearing for the rack ... .6125 ± .0015 in.(15.558 ± 0.038 mm)

Maximum permissible clearance between bore in the bearings and the rack ... .006 in.(0.15 mm)

(5) 3S1252 Spring:

Length under test force ... 1.73 in.(43.9 mm)

Test force ... 19 to 21 lb.(85 to 95 N)

Free length after test ... 1.98 in.(50.3 mm)

Outside diameter ... 1.14 in.(29.0 mm)

(6) Bore in bearings for the camshaft ... 2.4455 ± .0005 in.(62.116 ± 0.013 mm)

Diameter of bearing surface (journal) of the camshaft ... 2.4425 ± .0005 in.(62.040 ± 0.013 mm)

Maximum permissible clearance between bearing and bearing surface (journal) of camshaft ... .006 in.(0.15 mm)

(7) Torque for nut for camshaft ... 35 to 45 lb. ft.(45 to 60 N·m)

(8) Torque for nut that holds fuel lines ... 30 ± 5 lb. ft.(40 ± 7 N·m)

(9) Torque for nuts that hold nozzles ... 105 ± 5 lb. ft.(142 ± 7 N·m)

(10) Body.

(11) Torque for glow plugs ... 9 ± 1 lb. ft.(12 ± 1 N·m)

(12) Tighten nozzle finger tight in body.

(13) Torque for precombustion chamber (Apply 9M3710 Anti-Seize Compound on threads) ... 225 ± 15 lb. ft.(300 ± 20 N·m)

NOTE: See Glow Plug Positioning.

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