Weichai America Corp.
56
1.
Apply molybdenum disulfide grease on the intake/exhaust valve stem uniformly, and then
install the intake/exhaust valve to the cylinder head, and make sure that the intake/exhaust
valve can slide in the guide pipe without being blocked;
2.
Apply thread locking adhesive to the exhaust valve spring lower seat uniformly, and install the
lower seat onto the cylinder head in place, and check if the lower seat is properly seated; when
necessary, remove it for repair or replace with new one, and forced knocking is prohibited;
3.
Install the intake valve spring lower seat, place the valve stem protective sleeve onto the
intake/exhaust valve guide, and then install the valve stem seal sleeve;
Note: check if the spring inside the valve stem seal sleeve is intact before installation.
4.
Install the inner valve spring and outer valve spring, ensuring that they are reverse in spiral
direction;
5.
Install the valve spring upper seat, press the valve spring and install the valve collet;
6.
Use a rubber hammer to tap valve collet into the intake/exhaust valve seat after installation; if
the valve collet or valve spring upper seat is not properly seated, find out the causes for
troubleshooting.
4.5.5 Inspection and repair of valve
Key point 1:
Inspection
1) Check the valve stem and valve stem end surface for wear;
2) Check the valve cone for wear or damage;
3) Check the valve cone for soot deposition.
Key point 2:
Assembly
1) The intake/exhaust valve can slide in the guide pipe without being blocked;
2) Check if the spring inside the valve stem seal sleeve is intact before installation.
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