Cylinder Block; Cylinder Head - Westerbeke Universal M-50 Operator's Manual

CYLINDER BLOCK
The engine features a high durability tunnel-typed cylinder in which the crank bearing part is
constructed body. Furthermore, dry-type cylinder liners, being pressure-fitted into cylinders, allow
effective cooling, less distortion, higher wear-resistance qualities and each cylinder having its own
chamber helps to minimize noise.
Tunnel cylinder block
CYLINDER HEAD
The cross-flow type inlet/exhaust ports in this engine have their openings at both sides of the
cylinder head. Because overlaps of inlet/exhaust ports are smaller than in ports of other types
which have openings one side, the suction air can be protected from being heated and expanded
by heated exhaust air. The cool, high density suction air has a higher voluminous efficiency and
raises the power of the engine. Furthermore, distortion of the cylinder head by heated exhaust air
is reduced because suction ports are arranged alternately. The combustion chamber is exclusive
spherical combustion chamber type. Suction air is whirled to be mixed effectively with fuel,
prompting combustion and reducing fuel consumption.
In the combustion chamber are installed throttle type injection nozzle and rapid heating sheathed
type glow plug. This glow plug assures easier than ever engine starts even at -15°C (15°F).
Cross-flow
type
cylinder head
Combustion chamber
(6
(1)
1_ Combustion chamber
2. Suction
3. Exhaust
4. Nozzle assembly
5. Glow plug
6.
Cylinder head
26