G3406 Engines Caterpillar

Illustration 1	g01014579

Note: Refer to Guidelines For Reusable Parts, SEBF8002 and SEBF8034, "Valves And Valve Springs" in order to check used valves and valve springs.

(1) 4N-5906 Spring

Length under test force ... 54.99 mm (2.165 inch)

Test force ... 344 ± 34 N (77.3 ± 7.6 lb)

Length at valve open position ... 42.93 mm (1.690 inch)

Free length after test ... 62.7 mm (2.47 inch)

Outside diameter ... 31.75 mm (1.250 inch)

(2) Height to top of valve guide ... 24 ± 0.8 mm (0.9449 ± 0.0315 inch)

(3) Diameter of new valve stem

Inlet ... 9.441 ± 0.008 mm (0.3717 ± 0.0003 inch)

Exhaust ... 9.441 ± .01 mm (0.3717 ± 0.0004 inch)

Minimum diameter of the valve stem

Inlet ... 9.309 mm (0.3665 inch)

Exhaust ... 9.309 mm (0.3665 inch)

Bore in a new guide ... 9.502 mm (0.3741 inch)

(4) Diameter of valve head

Inlet ... 44.98 ± 0.13 mm (1.771 ± 0.005 inch)

Exhaust ... 41.81 ± 0.13 mm (1.646 ± 0.005 inch)

(5) Angle of valve face ... 19.25 ± 0.25 degrees

Illustration 2	g01014632

(6) Depth of bore in head for new valve seat insert ... 12 ± .1 mm (0.4724 ± 0.0039 inch)

(7) Diameter of valve seat insert

Inlet ... 46.025 ± .015 mm (1.8120 ± 0.0006 inch)

Exhaust ... 42.840 ± .015 mm (1.6866 ± 0.0006 inch)

Bore in head for valve seat insert

Inlet ... 45.949 ± 0.025 mm (1.8090 ± 0.0010 inch)

Exhaust ... 42.774 ± .025 mm (1.6840 ± 0.0010 inch)

(8) Angle of valve insert face ... 20.25 ± 0.5 degrees