C9 Marine Engines and C9 Marine Generator Sets Caterpillar

Illustration 1	g01343278
(1) Inlet valve (2) Exhaust valve

Note: Coat the inlet valve stems and the exhaust valve stems with 8T-2998 Lubricant prior to installation into the cylinder head.

(A) Height to the step that is in the valve guide ... 12.0 ± 0.5 mm (0.47 ± 0.02 inch)

(3) 241-8386 Spring

Length under test force ... 42.8 mm (1.69 inch)

Test force ... 152.5 ± 7 N (34 ± 1.6 lb)

Free length after test ... 56.68 mm (2.232 inch)

Outside diameter ... 21.33 mm (0.840 inch)

(4) 190-6117 Spring

Length under test force ... 37.70 mm (1.484 inch)

Test force ... 350 ± 17 N (79 ± 3.8 lb)

Free length after test ... 57.80 mm (2.276 inch)

Outside diameter ... 31.79 mm (1.252 inch)

(5) 241-8385 Spring

Length under test force ... 44.0 mm (1.73 inch)

Test force ... 305 ± 15 N (69 ± 3.4 lb)

Free length after test ... 67.69 mm (2.665 inch)

Outside diameter ... 28.56 mm (1.124 inch)

(6) 190-6115 Spring

Length under test force ... 36.5 mm (1.44 inch)

Test force ... 187 ± 8 N (42 ± 1.8 lb)

Free length after test ... 57.80 mm (2.276 inch)

Outside diameter ... 23.18 mm (0.913 inch)

(B) New valve stem diameter

Inlet valve ... 8.000 ± 0.010 mm (0.3150 ± 0.0004 inch)

Exhaust valve ... 9.441 ± 0.010 mm (0.3717 ± 0.0004 inch)

(C) Diameter of valve head

Inlet valve ... 39.00 ± 0.13 mm (1.535 ± 0.005 inch)

Exhaust valve ... 36.00 ± 0.13 mm (1.417 ± 0.005 inch)

Illustration 2	g01343315
View of area D

(F) Angle of face of inlet valve seat insert ... 30.25 ± 0.25 degrees

Illustration 3	g01343289
View of area E

(G) Angle of face of exhaust valve seat insert (first cut) ... 20 ± 1 degrees

(H) Angle of face of exhaust valve seat insert (second cut) ... 45 ± 0.25 degrees

Illustration 4	g01343291

(J) Depth of the bore in the cylinder head for the valve seat insert

Inlet ... 9.30 ± 0.05 mm (0.366 ± 0.002 inch)

Exhaust ... 10.40 ± 0.05 mm (0.409 ± 0.002 inch)

Note: Shrink the valve seat inserts by reducing the temperature. Shrinking the valve seat inserts allows placement into the counterbore.

(K) Valve seat insert

Diameter of valve seat insert (inlet valve) ... 40.060 ± 0.013 mm (1.5772 ± 0.0005 inch)

Bore in cylinder head for valve seat insert (inlet valve) ... 40.000 ± 0.015 mm (1.5748 ± 0.0006 inch)

Diameter of valve seat insert (exhaust valve) ... 37.560 ± 0.013 mm (1.4787 ± 0.0005 inch)

Bore in cylinder head for valve seat insert (exhaust valve) ... 37.500 ± 0.015 mm (1.4764 ± 0.0006 inch)

(L) Angle of valve face

Angle of the inlet valve face ... 60.5 ± 0.25 degrees

Angle of the exhaust valve face ... 45.75 ± 0.25 degrees