TUBE AS 2272457 - Caterpillar

Illustration 1 g00876966
Cylinder head tightening sequence
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 1. Tighten the bolts to the following torque. ... 110 N m (80 lb ft)
Repeat the procedure in Step 1 to ensure that all of the bolts are tightened to the correct torque.
Use the numerical sequence that is shown in Illustration 1 to tighten the bolts for the additional torque-turn specification.
Tighten the short bolts (S) for an additional 150 degrees (2.5 flats).
Tighten the medium sized bolts (M) for an additional 180 degrees (3.0 flats).
Tighten the long bolts (L) for an additional 210 degrees (3.5 flats). Cylinder head thickness ... 102.79 to 103.59 mm (4.047 to 4.078 inch)Minimum permissible thickness after the cylinder head face has been resurfaced. ... 102.48 mm (4.035 inch)Maximum permissible projection of the fuel injection nozzle below the face of the cylinder head after resurfacing ... 3.06 mm (0.1205 inch)
Illustration 2 g00295372
Checking the distortion of the cylinder head
Maximum distortion of the cylinder head is given in the following table.
Table 1
Dimension Maximum Permissible Distortion
Width "A" 0.13 mm (0.005 inch)
Length "B" 0.25 mm (0.009 inch)
Diagonal "C" 0.25 mm (0.009 inch)