3024C Engine for Caterpillar Built Machines Caterpillar

Illustration 1	g00845814
Cross section view of the cylinder head valves in the cylinder head

Illustration 2	g00845818
Typical example of the cylinder head and the valves The arrow points toward the front of the engine.

(1) Collet which consists of two pieces

(2) Valve spring cap

(3) Valve spring

Free length ... 33.5 to 35.0 mm (1.32 to 1.38 inch)

Length of valve spring under test force ... 30.40 mm (1.197 inch)

Test force ... 69 to 79 N (16 to 18 lb)

(4) Valve guide seal for the exhaust valve

Type ... Black garter spring

Label on the black garter spring ... "EX"

(5) Recess for spring

Illustration 3	g00845819

(6) Valve guide

(A) Clearance between the valve and valve guide ... 0.030 to 0.060 mm (0.0012 to 0.0024 inch)

Clearance between the valve and valve guide ... 0.20 mm (0.0079 inch)

(A) Standard clearance for the exhaust valve ... 0.050 to 0.075 mm (0.0020 to 0.0030 inch)

Service limit for the exhaust valve ... 0.25 mm (0.010 inch)

(7) Exhaust valve stem

Diameter of the exhaust valve stem ... 6.940 to 6.950 mm (0.2732 to 0.2736 inch)

Service limit ... 6.840 mm (0.2693 inch)

(8) Inlet valve stem

Diameter of the inlet valve stem ... 6.955 to 6.970 mm (0.2738 to 0.2744 inch)

Service limit ... 6.890 mm (0.2710 inch)

(9) Valve face angle

Valve face angle ... 45 degrees

Valve seat angle ... 45 degrees

Illustration 4	g00845823

(B) Thickness of the valve head

Exhaust valve ... 0.925 to 1.075 mm (0.03642 to 0.04232 inch)

Service limit for the exhaust valve ... 0.50 mm (0.020 inch)

Inlet valve ... 0.925 to 1.075 mm (0.03642 to 0.04232 inch)

Service limit for the inlet valve ... 0.50 mm (0.020 inch)

Illustration 5	g00845825

(C) Valve depth below the cylinder head face

Valve depth for the exhaust valve ... 0.65 to 0.95 mm (0.026 to 0.037 inch)

Service limit for the exhaust valve ... 1.8 mm (0.07 inch)

Valve depth for the inlet valve ... 0.65 to 0.95 mm (0.026 to 0.037 inch)

Service limit for the inlet valve ... 1.8 mm (0.07 inch)

(10) Cap

(11) Valve guide seal for the inlet valve

Type ... Silver garter spring

(12) Cylinder head

(13) Gasket

The code number that is printed on the gasket should face the cylinder head.

(14) Pushrod

Diameter of pushrods ... 6.30 mm (0.248 inch)

Length of the pushrod ... 205.1 to 205.9 mm (8.08 to 8.11 inch)

Illustration 6	g00845827

(15) Valve seat insert

(D) Standard width for the exhaust valve ... 1.94 to 2.16 mm (0.076 to 0.085 inch)

Service limit for the exhaust valve ... 2.5 mm (0.10 inch)

(D) Standard width for the inlet valve ... 1.50 to 2.00 mm (0.059 to 0.079 inch)

Service limit for the inlet valve ... 2.5 mm (0.10 inch)

(16) Lifter