C2.2 Engines for Caterpillar Built Machines Caterpillar

Cylinder Head

Usage:

239D BL9

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Illustration 1	g03811103
Typical example

(1) Dowel pins

The dowel pins in the cylinder block hold the cylinder head gasket in the correct position when the cylinder head is installed.

(2) Cylinder head gasket

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Table 1
Selection of Head Gasket
Piston Height Above Top Face of Cylinder Block	Gasket Thickness
+0.3 to 0.4 mm (+0.0118 to 0.016 inch)	1.1 mm (0.043 inch)
+0.4 to 0.5 mm (+0.016 to 0.020 inch)	1.2 mm (0.047 inch)
+0.5 to 0.6 mm (+0.020 to 0.024 inch)	1.3 mm (+0.051 inch)

(3) The stamped marking on the cylinder head gasket must face upward. The stamped marking ensures that the cylinder head gasket is installed correctly.

Tightening Procedure for the Cylinder Head

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Illustration 2	g01309552
Typical example

Use the following procedure in order to tighten the bolts for the cylinder head.

Put clean engine oil on the threads of the bolts. The bolts are tightened in the numerical sequence that is shown in Illustration 2.
Torque for the bolts ... 50 N·m (37 lb ft)
Tighten the bolts to the additional amount. ... 150 degrees

Measuring the Distortion of the Cylinder Head

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Illustration 3	g00900977
Typical example

Distortion of the cylinder head ... 0.00 to 0.05 mm (0.000 to 0.002 inch)

Maximum service limit ... 0.12 mm (0.005 inch)

Maximum limit for regrinding ... 0.15 mm (0.006 inch)

Note: Use a straight edge and a feeler gauge to check the six positions for distortion.

Refer to Systems Operation, Testing and Adjusting, "Cylinder Head - Inspect" for the procedures for measuring the cylinder head.

Note: If the cylinder head has been machined, check the valve depth below the cylinder head face. Refer to Specifications, "Cylinder Head Valves" for valve depth.