Subaru Robin Power Products DY35, DY41, DY30 manual Cylinderhead

4 - 2 CRANKSHAFT

Thecrankshaft is madeofaforgedchromeandmolybdic 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 aredrilled through.

(See Fig. 2.)

4-3CONNECTINGROD 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 thepressure resultant from pitching duringhigh-speed operation. At the larger end thin kelmetis fitted forincreas- ing durability.

4 - 3 - 2 PISTON

Piston is made of cast aluminum alloy, and it hastwo com- pression rings and an oil ring.Combustion chamber arranged atthepistionhead, where combustion gas is made up by mixing atomized fuel and air, andignites. (See Fig. 3.)

4-4CYLINDER and CYLiNDERHEAD

4-4-1 CYLINDER

Cylinder is made of aluminum alloy diecasting, in which special cast iron liner is cast, andis provided with many cool- ing fins designed for effective cooling.

4 - 4 - 2 CYLINDERHEAD

The most important partof 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 thevalve seats fine quahty heat re- sistance seats are pressure-fitted considering high resistance

-to abrasionandcorrosionat high temperature. (See Fig. 4.)

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Fig. 2

Fig. 3

Fig. 4

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