Cylinder block
The
cylinder
block is cast in one piece from special cast
iron alloy. The camshaft is located in the engine block.
The D1-13 engine has two cylinder bores, the D1-20
and D1-30 have three, and the D2-40 has four.
The D1-13 and D1-20 engines have the same cylinder
dimensions. So do the D1-30 and D2-40 engines, but
larger.
All engines have cylinders machined directly in the
block.
Oil pan
The oil pan is located under the cylinder block and is
made from pressed sheet steel. There is an oil drain
pipe installed beneath the oil pan.
Camshaft
The camshaft has lobes which operate the valves, the
fuel pump and the injection pump. The camshaft is
driven by a gear train.
Cylinder head
The cylinder head (1) is made from special cast iron
alloy.
The cylinder head has one inlet and one exhaust valve
per cylinder. These are operated by the camshaft via
valve lifters and push rods. The valves have replace-
able seats.
An injector is installed in the combustion chamber of
each cylinder. There is one glowplug per cylinder.
Rocker arm cover
The rocker arm cover (2) is aluminum and is located
above the cylinder head. The valve mechanism is
installed underneath the cover. Pressurized lubrication
oil passes via an external pipe to the rocker arm shaft,
and then lubricates the rocker arms and valves.
Valve Cover
The valve cover (3) is made of aluminum and is located
above the rocker arm cover. The valve cover has two
internal sections, of which one leads inlet air down into
the cylinder head via an inlet. The other section con-
tains the crankcase ventilation valve.
20-0 Engine Information, General
47701798 05-2013 © AB VOLVO PENTA 35
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