G343 ENGINE Caterpillar


Valves

Usage:

Valve timing (when valve is off seat) ... .075 in.(1,905 mm)

Exhaust opening (before bottom center) ... 18° 24'

Exhaust closing (before top center) ... 2° 55'

Inlet opening (after top center) ... 1° 14'

Inlet closing (after bottom center) ... 13° 34'

(1) 2S4213 Spring-valve:

Length-test force applied ... 1.95 in.(49,53 mm)

Test force ... 55.0 ± 3.5 lbs.(24,95 ± 1,59 kg)

Free length after test ... 2.31 in.(58,67 mm)

Outside diameter ... 1,486 in.(37,74 mm)

(2) Diameter-stem ... .3717 ± .0003 in.(9,442 ± 0,008 mm)

Clearance-in guide ... .0009 ± .0006 in.(0,023 ± 0,015 mm)

Maximum permissible clearance ... .005 in.(0,127 mm)

(3) Thickness-inlet valve lip (minimum) ... .0995 in.(2,527 mm)

Thickness-exhaust valve lip (minimum) ... .171 in.(4,34 mm)

(4) Angle-inlet valve face ... 44 1/4°

Angle-exhaust valve face ... 19 1/4°

(5) Diameter-inlet valve head ... 1.771 ± .005 in.(44,98 ± 0,127 mm)

Diameter-exhaust valve head ... 1.646 ± .005 in.(41,808 ± 0,127 mm)

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