30637867 Volvo.Penta Sealing ring

Illustration 1 g00307567
Right Side Of G3606 Engine (1) Covers (for the camshaft). (2) Covers (for the inspection of the connecting rod bearings and the main bearings.Covers (1) allow access in order to inspect and perform maintenance of the camshafts, the valve lifters and the valve lifter guides.Covers (2) allow access in order to inspect and perform maintenance of the crankshaft, the connecting rods, the piston cooling jets and the main bearings.Pistons, Rings And Connecting Rods
The piston is a two-piece unit. A steel crown is held to a forged aluminum body by four studs and nuts. An inner cooling chamber and outer cooling chamber are formed inside the crown. The cooling jet oil flow enters the outer chamber through a drilled passage in the piston body. After entering the outer shaker chamber, the oil flows to the inner shaker chamber. Then the oil returns to the sump through a centrally located drain hole that is located above the small end of the connecting rod.Three piston rings are used on the piston assembly for sealing combustion gas and oil control. The top and middle piston rings are located in a hardened steel groove in the piston crown. The third piston ring (oil control) is located in the aluminum body.The oil control ring is located in the lower groove in the aluminum body. Four holes are drilled from the bottom edge of the oil groove to the interior of the piston. The four holes drain excess oil from the oil ring. The piston has two 1/2 -13 NC threaded holes in the crown for lifting the piston and connecting rod assembly.The connecting rod has a taper on the pin bore end. This gives the connecting rod and the piston more strength in the areas with the most load. Four bolts and nuts hold the connecting rod cap to the connecting rod.Crankshaft
The crankshaft changes the combustion forces in the cylinders into a usable rotating torque in order to send power from the crankshaft. Vibration dampers are used at the front of the crankshaft to reduce torsional vibrations (twist on crankshaft).The crankshaft has the following characteristics: press forging, induction hardened and regrindable. A counterweight for each cylinder is welded to the crankshaft then ultrasonically examined to ensure weld integrity.Identical flanges are machined at each end of the crankshaft for the flywheel and vibration damper mounting. The front of the crankshaft can be distinguished from the rear of the crankshaft by the marking "FRONT" stamped on the center of the front hub. Also, the rear flange has tapped holes in order to mount the crankshaft timing pin bracket.The crankshaft for the G3606 Engine is supported by seven main bearings. The crankshaft for the G3608 Engine is supported by nine main bearings. Crankshaft thrust is taken by two half-circle, steel backed aluminum plates located in the counterbores of each side of the rear bearing saddle in the cylinder block.The crankshaft drives a group of gears on the front and rear of the engine. The gear group on the front of the engine drives the oil pump and water pumps. The gear group on the rear of the engine drives the camshafts and the optional alternator.Lip type crankshaft seals are used at each end of the crankshaft. The seal assemblies are fastened to the front housing and the rear housing. The lips of the seals contact the adapters that are bolted to each end of the crankshaft.Pressure oil is supplied to all the main bearings through drilled passages in the webs of the cylinder block. The oil flows through holes drilled in the crankshaft in order to provide oil for the connecting rod bearings.Camshafts
The engine has a camshaft group for each side of the engine.The camshafts are made from identical cam segments, journals, spacers and a drive end. Each cam segment has three lobes. The cam segments are replaceable at each cylinder through access holes in the cylinder block. Each camshaft group is supported by seven bearings. A thrust plate at the rear of each camshaft controls end play.As the camshaft turns, each lobe moves a lifter assembly. There are three lifter assemblies for each cylinder. The outer lifter assemblies each move a pushrod and a set of valves (inlet or exhaust). The center lifter assembly moves a pushrod that operates the gas inlet valve.Each camshaft must be in time with the crankshaft and with each other. The relation of the cam lobes to the crankshaft position will cause the valves (inlet and exhaust) and the gas inlet valve in each cylinder to operate at the correct time. Timing relationship of the camshaft and crankshaft is established from the No. 1 cylinder, Top Center (TC) position. Timing pins are provided for the camshaft and the crankshaft in order to establish No. 1 Top Center Position. Front Gear Train
The front gear train provides the drives for the engine oil pump, the jacket water pump, the engine oil cooler and the aftercooler water pump. The oil pump drive gear is supported by the pump. The water pump drive gears are supported by bearings on the ends of the shafts.Rear Gear Train
The rear gear train provides the drives for the camshaft, the power take-off and the alternator. The crankshaft gear is piloted on the crankshaft. The crankshaft goes between the flywheel mounting adapter and the crankshaft flywheel flange. In addition to the flywheel bolts, four bolts are used to hold the adapter and gear to the crankshaft.Crankcase Explosion Relief Valves
Illustration 2 g00307565
Crankcase Explosion Relief ValveThe crankcase explosion relief valves open in order to relieve the pressure from a crankcase explosion. The valves then close immediately in order to keep fresh air from entering the crankcase. A pressure of 7 kPa (1 psi) is required to open the valve. An oil screen quenches any flames from an explosion.Four crankcase explosion relief valves are used on G3606 Engines. Five crankcase explosion relief valves are used on G3608 Engines. Do not change the total number of crankcase explosion relief valves