YOKE 4K7556 - Caterpillar

One of two types of cylinder head bolts can be installed. Type One bolts can be reused if the bolts are serviceable. Refer to Illustration 1. Type Two bolts must be discarded and new bolts installed. Refer to Illustration 2.
Illustration 1 g06221869
Type One cylinder head bolts
Illustration 2 g06220283
Type Two cylinder head bolts
Removal Procedure
Start By:
Remove the exhaust manifold. Refer to Disassembly and Assembly, "Exhaust Manifold - Remove and Install" for the correct procedure.
Remove the fuel filter base. Refer to Disassembly and Assembly, "Fuel filter Base - Remove and Install" for the correct procedure.
Remove the fuel injectors. Refer to Disassembly and Assembly, "Fuel Injector - Remove" for the correct procedure.
Remove the glow plugs. Refer to Disassembly and Assembly, "Glow Plugs- Remove and Install" for the correct procedure.
Remove the rocker shaft and the pushrods. Refer to Disassembly and Assembly, "Rocker Shaft and Pushrod - Remove" for the correct procedure.
Remove the water pump. Refer to Disassembly and Assembly, "Water Pump - Remove and Install" for the correct procedure.
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Dispose of all fluids according to local regulations and mandates.
Drain the coolant from the cooling system into a suitable container for storage or for disposal. Refer to Operation and Maintenance Manual, "Cooling System Coolant - Drain" for the correct draining procedure.
Illustration 3 g06221686
Typical example
Illustration 4 g01317351
The cylinder head tightening sequence for three cylinder engine
Illustration 5 g01309552
The cylinder head tightening sequence for four cylinder engine
Gradually loosen bolts (1) in reverse numerical order. This order will prevent distortion of the cylinder head.For three cylinder engines, loosen the cylinder head bolts in the reverse order to the sequence that is shown in Illustration 4.For four cylinder engines, loosen the cylinder head bolts in the reverse order to the sequence that is shown in Illustration 5.
Remove bolts (1) from cylinder head (2).Note: Type Two bolts must be discarded.
Attach a suitable lifting device to cylinder head (2). The weight of the cylinder head is approximately 30 kg (66 lb). Carefully lift the cylinder head off the cylinder block.Note: Do not use a lever to separate the cylinder head from the cylinder block. Take care not to damage the machined surfaces of the cylinder head during the removal procedure. Avoid contamination of the cylinder bores with coolant or with debris.
Place the cylinder head on a surface that will not scratch the face of the cylinder head.
Remove the cylinder head gasket.Note: The old gasket for the cylinder head should be retained for identification. Gaskets of different thickness are available. Refer to Specifications, "Cylinder Head" for further information.
Illustration 6 g01317405
Typical example
Note the position of dowels (3) in the cylinder block. Do not remove the dowels unless the dowels are damaged.
If necessary, remove the water temperature regulator from the cylinder head. Refer to Disassembly and Assembly, "Water