3306B Industrial Engine Caterpillar

Note: Refer to the Guideline for Reusable Parts, SEBF8002 or refer to the Guideline for Reusable Parts, SEBF8034 for the necessary procedures and specifications for checking used valves and valve springs.

Illustration 1	g01443249

(1) 7S-7144 Spring (new spring for the valves)

Length under test force ... 44.86 mm (1.766 inch)

Test force ... 257 ± 25 N (57.7 ± 4.5 lb)

The "use again" minimum load at the length under test force ... 217 N (48.8 lb)

Length of the spring at the valve open position ... 32.28 mm (1.271 inch)

The "use again" minimum load at the valve open position ... 658 N (148.5 lb)

Free length after test ... 52.07 mm (2.050 inch)

Outside diameter ... 35.22 mm (1.387 inch)

Do not bend the spring more than the following value. ... 1.82 mm (0.072 inch)

(A) Height to the top of the valve guide ... 22.23 ± 0.25 mm (0.875 ± 0.010 inch)

(B) New valve stem

Diameter of the new valve stem ... 9.441 ± 0.008 mm (0.3717 ± 0.0003 inch)

The "use again" minimum diameter ... 9.408 mm (0.3704 inch)

Bore in the valve guide for the guide that is installed in the head

New minimum distance ... 9.478 mm (0.3731 inch)

Worn maximum distance ... 9.581 mm (0.3772 inch)

(C) Valve lip thickness which is the distance between the taper seat (diameter) and the valve face

The minimum "use again" distance for the exhaust valve ... 2.18 mm (0.086 inch)

The minimum "use again" distance for the inlet valve ... 1.75 mm (0.069 inch)

(D) Diameter of the valve head

Exhaust valve ... 48.16 ± 0.13 mm (1.896 ± 0.005 inch)

Inlet valve ... 51.31 ± 0.13 mm (2.020 ± 0.005)

(E) Angle of the valve face ... 60.75 ± 0.25 degrees

Illustration 2	g01439813

(F) Depth of the bore in the head for the valve seat insert ... 12.28 ± 0.13 mm (0.483 ± 0.005 inch)

(G) Valve seat insert

Diameter of the valve seat insert for the exhaust valve ... 50.889 ± 0.013 mm (2.0035 ± 0.0005 inch)

Bore in the head for the valve seat insert for the exhaust valve ... 50.813 ± 0.030 mm (2.0005 ± 0.0012 inch)

Diameter of the valve seat insert for the inlet valve ... 52.032 ± 0.013 mm (2.0485 ± 0.0005 inch)

Bore in the head for the valve seat insert for the inlet valve ... 51.956 ± 0.030 mm (2.0455 ± 0.0012 inch)

(H) Angle of the face of the valve seat insert ... 30 ± 1 degrees

(I) Width of the valve seat for the inlet valve and the exhaust valve

Maximum permissible width ... 1.93 mm (0.076 inch)

Minimum permissible width ... 1.14 mm (0.045 inch)

(J) Dimension from the top of the closed valve to the face of the head

Minimum permissible dimension for the exhaust valve ... 0.66 mm (0.026 inch)

Minimum permissible dimension for the inlet valve ... 0.15 mm (0.006 inch)

(K) Outside diameter of the face of the valve seat insert

Exhaust seat ... 46.02 mm (1.812 inch)

Maximum permissible distance for the exhaust seat ... 47.29 mm (1.862 inch)

Inlet seat ... 49.28 mm (1.940 inch)

Maximum permissible distance for the inlet seat ... 50.55 mm (1.990 inch)

(L) Grind the seat of the face of the insert by 15 degrees in order to get a reduction of the maximum seat diameter.