Cylinder Block; Cylinder Head - Kubota D650-B Handbuch

[AI Tunnel cylinder block
OOllF012
1-1 CYLINDER BLOCK
Th~ engine features a high durability tunnel-type 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.
[AI Cross-flow type cylinder head
00 76F006
IB]
\11
1-2 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 high
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 of KUBOT,A;'s ex­
clusive 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 in­
jection nozzle and rapid heating sheathed type glow plug.
This glow plug assures easier than ever engine starts even at
-15°C (5°F).
(1) Combustion chamber 141
Nonie assembly
(2) Suction
\51
Glow plug
(3) Exhaust (6) Cylinder head
- - - - . - - - - - - - - - - - - - - - - - ­
Combustion chamber
(6
40