Crankshaft; Connecting Rod And Piston; Cylinder And Cylinderhead - Robin America DY30 Service Manual

4-2
CRANKSHAFT
The crankshaft is made of a forged chrome and molybdic
steel piece with the crank pins and the journals ground t o
high precision after induction hardening. It is fitted to the
flywheel on the fan side, and connection of the drive shaft
to it is also possible. In the center of the pins and the jour-
nals, holes for forced lubrication are drilled through.
(See Fig. 2.)
4-3
CONNECTING ROD and
PISTON
4 - 3 - 1 CONNECTING ROD
The connecting rod is made
of
forged pieces of aluminum
alloy designed with sufficient strength to withstand buckling
and tensile forces inflicted on it under high-load operating
conditions. At the small end a bushing is forcefitted to with-
stand the pressure resultant from pitching during high-speed
operation. At the larger end thin kelmet is fitted for increas-
ing durability.
4 - 3 - 2 PISTON
Piston is made of cast aluminum alloy, and it has two com-
pression rings and an oil
ring.
Combustion chamber arranged
at the pistion head, where combustion gas is made up by
mixing atomized fuel and air, and ignites. (See Fig. 3.)
4-4 CYLINDER and CYLiNDERHEAD
4-4-1 CYLINDER
Cylinder is made of aluminum alloy die casting, in which
special cast iron liner is cast, and is provided with many cool-
Fig. 2
Fig. 3
ing fins designed for effective cooling.
4 - 4 - 2 CYLINDERHEAD
The most important part of the diesel engine is cylinderhead.
It is a one-piece of aluminum alloy die casting, in which in-
take and exhaust ports, and rocker chamber are cast in the
most ideal structure for the highest strength and the high-
est cooling efficiency. In the valve seats fine quahty heat re-
sistance seats are pressure-fitted considering
high
resistance
-
to abrasion and corrosion at high temperature. (See Fig.
4.)
Fig. 4
-
- 6 -