HOUSING 3B8658 - Caterpillar

Illustration 1 g00295370
Sequence of bolt tightening in the cylinder headTightening procedure for bolts and nuts in the cylinder head
Put engine oil on the threads of the bolts and the nuts. Tighten the bolts and the nuts in the number sequence in the Illustration 1.Tighten the bolts and nuts to the following torque: ... 110 N m (81 lb ft)
Again tighten the bolts and nuts in the number sequence.Tighten the bolts and nuts to the following torque: ... 110 N m (81 lb ft)
Tighten the bolts and nuts in the number sequence to the following values.
Tighten the bolts of short length "S" to the following value.Amount for bolt tightening ... an additional 150 degrees
Tighten the bolts of medium length "M" to the following value.Amount for bolt tightening ... an additional 180 degrees
Tighten the bolts of long length "L" to the following value.Amount for bolt tightening ... an additional 210 degrees
Illustration 2 g00295371
Bolts, nuts, and components of the cylinder head (1) Tighten the nuts that hold fuel injection nozzles to the following torque: ... 12 N m (106 lb in)Note: Replace the dust seal and the seat washer when you remove the fuel injection nozzle. (2) Tighten the nuts for fuel line to the following torque: ... 18 N m (159 lb in) (3) Tighten the bolts that hold the rocker shaft to the cylinder head to the following torque:Begin with the bolts on the inside and work toward the bolts on the end. Cast iron or steel bracket ... 75 N m (55 lb ft) Aluminum bracket ... 40 N m (30 lb ft) (4) Valve lash (hot or cold) Inlet valve ... 0.20 mm (0.008 inch) Exhaust valve ... 0.45 mm (0.018 inch) (5) Maximum permissible nozzle projection below cylinder head face after resurfacing ... 4.45 mm (0.175 inch)Maximum allowance for resurfacing ... 0.30 mm (0.012 inch) (6) Depth of new cylinder head ... 102.79 to 103.59 mm (4.047 to 4.078 inch)Minimum depth of cylinder head after resurfacing ... 102.48 mm (4.035 inch)
Illustration 3 g00295372
Positions for measuring the bow of the cylinder head (typical example)Maximum permissible amount of bow (curve of cylinder head)Naturally aspirated engines A ... 0.08 mm (0.003 inch) B ... 0.15 mm (0.006 inch) C ... 0.15 mm (0.006 inch)Turbocharged engines A ... 0.13 mm (0.005 inch) B ... 0.25 mm (0.010 inch) C ... 0.25 mm (0.010 inch)Tighten the bolts of the inlet manifold (not shown) to the following torque: ... 44 N m (32 lb ft)Tighten exhaust manifold nuts (not shown) to the following torque: Plated ... 44 N m (32 lb ft) Non-plated ... 50 N m (37 lb ft)