Subaru Robin Power Products R1200 Main Bearing Cover, Crankshaft, 4CONNECTING ROD and Piston

4-2 ENGINE

4-2-l CYLINDER AND CRANKCASE

The cylinder and the crankcase of the engine are of a one-piece aluminum die-cast design. The specific iron cylinder is cast-fitted inside the cylinder. Both the intake and exhaust ports are positioned at the lateral side of the cylinder. These ports are also cast by using a mould with die-cast cores. The crankcase has its joint face located on the generator side, and it is of an assembly structure.

4-2-2 MAIN BEARING COVER

The main bearing cover is alminum die-cast and is mounted on the generator side. By removing it, the interior of the engine can be inspected.

4-2-3 CRANKSHAFT

The crankshaft is constructed of forged carbon steel, and the crankpin is induction-hardened. A crank gear is pressure-fitted on the generator side of the engine.

4-2-4CONNECTING ROD AND PISTON

The connecting rod is made of forged aluminum alloy with both the major and minor ends utilized as bearings. An oil scraper is cast on the major end. The aluminum alloy casting piston has slots on which two compression rings and one oil ring can be assembled.

4-2-5 CAMSHAFT

The camshaft is made of special cast iron and has intake and exhaust valve drive cams, each of which engages with the camgear. An exclusive aluminum alloy is used on each end of the camshaft in the place of bearings. (Ball bearings are not used.)

4-Z-6 VALVE ARRANGEMENT

The intake valve is arranged in the generator side, while the exhaust valve is arranged in the recoil side.

4-2-7 CYLINDER HEAD

The cylinder head is die-cast aluminum and has a Ricardo type combustion chamber featuring greater volume capacity for improved combustion efficiency. For easier ignition plug mainte- nance the cylinder head is positioned vertically.

4-2-8 GOVERNOR

The centrifugal weight governor ensures constant engine speed, regardless of load fluctuations (the governor is mechanically linked to the governor drive gear).

4-2-9 COOLING SYSTEM

The cooling system with a cooling fan, which also functions as a flywheel, compulsorily sends cooling air to the cylinder and the cylinder head and cools them. This forced air cooling system has a baffle plate and a head cover.

4-Z-10LUBRICATION SYSTEM

The moving and sliding parts inside the engine are lubricated with the oil scraper fitted on the connecting rod by scraping and splashing oil in the crankcase.

-9-