C2.2 Engines for Caterpillar Built Machines Caterpillar

Illustration 1	g00903737
Typical example

(1) Valve spring

Standard free length ... 35.0 mm (1.378 inch)

Service limit for the standard free length ... 33.5 mm (1.319 inch)

Standard test force ... 79.4 N (17.8 lb)

Service limit for the standard test force ... 68.6 N (15.4 lb)

Length under test force ... 30.4 mm (1.197 inch)

(2) Valve guide seal for the exhaust valve

Identification ... Black garter spring

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

(3) Valve guide seal for the inlet valve

Identification ... Silver garter spring

(4) Valve spring recess for the valve spring

Illustration 2	g00903744
Typical example

(5) Exhaust valve guide

(A) Clearance between the exhaust valve and the valve guide ... 0.03 to 0.06 mm (0.00118 to 0.00236 inch)

Service limit ... 0.2 mm (0.008 inch)

(6) Inlet valve guide

(A) Clearance between the inlet valve and the valve guide ... 0.03 to 0.06 mm (0.00118 to 0.00236 inch)

Service limit ... 0.2 mm (0.008 inch)

(7) Exhaust valve stem

Diameter of the exhaust valve stem ... 6.955 to 6.970 mm (0.27382 to 0.27441 inch)

Service limit ... 6.89 mm (0.27126 inch)

(8) Inlet valve stem

Diameter of the inlet valve stem ... 6.955 to 6.970 mm (0.27382 to 0.27441 inch)

Service limit ... 6.89 mm (0.271 inch)

Illustration 3	g00845823
Typical example

(B) Thickness of the valve head ... 0.9 to 1.1 mm (0.0354 to 0.0433 inch)

Service limit ... 0.5 mm (0.020 inch)

Illustration 4	g00903773
Typical example

(C) Valve depth below the cylinder head face

Inlet and exhaust valves ... 0.75 to 0.85 mm (0.0295 to 0.0335 inch)

Service limit ... 1.6 mm (0.063 inch)

Illustration 5	g03811083
Typical example

(D) Valve seat angle ... 45 degrees

(E) Contact face

Exhaust valve ... 1.50 to 1.86 mm (0.059 to 0.073 inch)

Service limit ... 2.5 mm (0.098 inch)

Inlet valve ... 2.16 to 2.38 mm (0.085 to 0.093 inch)

Service limit ... 2.7 mm (0.106 inch)