Weifang 495 - Sequence of Tightening the Cylinder Head Nuts

ere The rocker arm shaft is made of two separated sections jointed
together by a connecting shaft, and each section is supported by
'two brackets. The "0" ring seal is used between the connecting
shaft a,ndthe rocker arm shaft rear section to prevent the lubricat-
ing oil from leakage. The rocker arm is provided wit.h an renewable
bushing made by powder metallurgy. The adjusting screw is fitted
on the head 'of the rocker arm for valve lash adjustment.
The decompressor shaft is supported by two rocker arm shaft
brackets. There are four decompression screws fitted on the shaft,
Turning theshaJt, the decompression screws will depress the in-
take valves to reduce the pressure inside the cylinders in behalf of
the engine starting easy.
A copper-asbestos gasket is fitted between the cylinder head
and the cylinder block. The cylinder head is fastened on the cylin-
der. block by 18 studs which should be tightened in the specified
sequence (as Fig. 3 shown) with the. specified torque in or'der to
preve.nt the two parts from deformation as well as to maitain the
gas tightnes-s between them.
Center Line' of Cylinders
Fig. 3 Diagram showing the sequence of tightening
the cylinder head nuts.
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