Cylinder Head - Description - Volvo DH10A 245 Service Manual

Cylinder head
The cylinders have separate cylinder heads, which are
interchangeable and bolted to the cylinder block by
four 3/4" bolts per cylinder head.
Having separate cylinder heads is not only technically
advantageous with regard to sealing between cylinder
head and cylinder block, it also makes servicing easier.
Sealing against the cylinder block consists of a special
groove in the cylinder head face, a steel gasket and a
stepped edge on the cylinder liner collar. Sealing on the
coolant side is provided by O-rings.
The inlet duct in the cylinder head has a defined and
accurately calculated shape that results in "whirled" air
in the piston combustion chamber. Far out on the inlet
valve the cylinder head has a notch that lowers the rota-
tion speed at the beginning of the valve opening move-
ment.
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