Weichai America Corp.
Revision: August 2019 42
3. Remove the cylinder head gasket. If more than one cylinder head gasket needs to be
disassembled, mark the cylinder number on the gaskets for reference.
4. Remove the intake and exhaust valve module. Refer to disassembly of valve mechanism (9.6)
for details
5. Remove the valve seal. Valve seals can’t be reused.
9.5.3 Cylinder Heads Assembly Procedure
1. Insert the seal valve into the valve guide pipe.
2. Install the intake valve and exhaust valve onto the cylinder head.
3. Install new cylinder head gaskets. Cylinder head gaskets cannot be reused.
4. Assemble the cylinder head to the engine block.
5. Thread the cylinder head bolts into the cylinder head.
6. Tighten the cylinder head bolts (See Key Point 1 in 9.5.4).
9.5.4 Inspection and maintenance of cylinder head
Key point 1: Assembling
1. Refer to Figure 9-5 for the bolt pre-tightening and tightening order for each individual
cylinder head. The cylinder heads should be tightened in the order 3-4-5-2-1-6.
Fig. 9-6 Individual Cylinder Head Tightening Order
2. The cylinder head bolt will stretch and deform between 0.2~0.6mm after tightening. The
bolt can’t be reuse if the length over 160.5mm.
3. Install the valve oil seal.
Key point 2: Inspection
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