Volvo Penta TMD22 Wartungshandbuch PDF herunterladen (Seite 18)

Cylinder head

General

The carbon deposits in a diesel engine are small

and therefore the number of operational hours do

not give an indication of when it is time to recondi-

tion a cylinder head. The factors which determine

when reconditioning is necessary are ease of start-

ing the engine and the all round performance.

The cylinder head is made of aluminum and the

head is drilled together with the camshaft cover in

order to localize the camshaft bearing. The cam-

shaft cams lie directly above the valves and affect

them using the valve lifters, which are mounted on

top of the valves. The shims are installed between

the valve lifters and the top of the valves so that ad-

justment is possible.

The cylinder head has two valves per cylinder.

Each valve is installed with a single valve spring.

The valves move in cast valve guides which are

pressed into the cylinder head and can be replaced.

Both the valve stems are equipped with oil seals

which pass over the top of the valve guides.

Valve seat inserts are installed in the cylinder head

for both the inlet and exhaust valves.

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Volvo Penta TMD22 Wartungshandbuch Seite 18