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In a snowmobile, a four-cycle engine has an alternator as a generator while the snowmobile body has heat exchangers through which the cooling water of the engine is cooled by heat exchange with external air and snow, in a front part and at the ceiling of a crawler house. The alternator is positioned

In a snowmobile, a four-cycle engine has an alternator as a generator while the snowmobile body has heat exchangers through which the cooling water of the engine is cooled by heat exchange with external air and snow, in a front part and at the ceiling of a crawler house. The alternator is positioned between the four-cycle engine and the front heat exchanger. Further, an exhaust manifold is arranged at an upper position in front of the engine body while an approximately cylindrical oil filter is provided under the exhaust manifold and inclined forwards in the vehicle's direction of travel.

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1. An arrangement and structure of auxiliaries in a four-cycle snowmobile engine mounted in an engine room located on a front body and in front of a seat, the four-cycle engine comprising:an engine body having a cylinder block on top of a crankcase; an exhaust manifold arranged on a front side of a

1. An arrangement and structure of auxiliaries in a four-cycle snowmobile engine mounted in an engine room located on a front body and in front of a seat, the four-cycle engine comprising:an engine body having a cylinder block on top of a crankcase; an exhaust manifold arranged on a front side of a cylinder head on top of the cylinder block; an oil pan under the crankcase; an oil filter having an approximately cylindrical shape, the oil filter being positioned above the oil pan, in front of the cylinder block under the exhaust manifold, and tilted forwards in a direction of travel so as to avoid interference with the exhaust manifold. 2. The arrangement and structure of auxiliaries in a four-cycle snowmobile engine according to claim 1, wherein:steering rods extend forwards from a lower position of the engine body and are coupled to a lower end of a steering post arranged in a rear of the engine body; the oil filter is positioned in a space enclosed, in a side view of the snowmobile body, by a crankshaft of the engine body, the exhaust manifold, and the steering rods. 3. The arrangement and structure of auxiliaries in a four-cycle snowmobile engine according to claim 1, wherein a water pump is arranged between the oil filter and the exhaust manifold and the oil filter is tilted so as to avoid its interface with the water pump.4. The arrangement and structure of auxiliaries in a four-cycle snowmobile engine according to claim 1, wherein a muffler is disposed in front of and a distance apart from the engine body and wherein a connecting pipe that joins the muffler and the exhaust manifold is off-centered to one side from a center of the engine body with respect to a body width direction so as to create a work space for oil filter replacement.5. The arrangement and structure of auxiliaries in a four-cycle snowmobile engine according to claim 1, wherein the engine body is tilted rearwards.6. A four-cycle engine for mounting in an engine room of a body of a snowmobile, the engine comprising:a crankcase having a crankshaft arranged along a body width direction of the snowmobile; a cylinder block having a central axis which is tilted rearward with respect to a vertical direction of the body of the snowmobile; an intake system including an intake manifold situated behind the central axis of the cylinder block; an alternator driven by rotation of the crankshaft, the alternator being disposed behind the cylinder block and beneath the intake system. 7. The engine of claim 6, wherein the alternator is situated relative to the intake system so that the intake system including the intake manifold prevents precipitation flowing into the engine room from wetting the alternator.8. The engine of claim 6, further comprising a water pump arranged above the crankcase and in front of the cylinder block.9. The engine of claim 8, wherein the water pump, the alternator, and the crankshaft are in an inverted triangular manner when viewed from a side.10. The engine of claim 8, wherein the water pump and alternator are axisymmetric with respect to an engine cylinder axis.11. The engine of claim 6, wherein the alternator is located at a side of a steering shaft of the snowmobile when viewed from a front of the snowmobile.12. The engine of claim 6, wherein further comprising an oil pan situated at a bottom of the crankcase.13. The engine of claim 12, wherein the alternator is situated vertically between the oil pan and the intake system.14. The engine of claim 6, wherein the alternator has an alternator pulley and the crankshaft has a crankshaft pulley, and wherein a belt is wound around an alternator pulley and a crankshaft pulley so that the alternator is driven by the crankshaft.15. The engine of claim 6, wherein the alternator is situated between the engine and a heat exchanger.16. The engine of claim 15, wherein the heat exchanger is behind the engine in a direction of travel of the snowmobile.17. The engine according to claim 6, wherein the alternator is disposed between the engine and a heat exchanger;a timing belt is wound between a pulley fitted on the crankshaft on a side opposite to that where an engine clutch mechanism is disposed and a pulley for driving the alternator, so that the alternator is driven by the rotation of the crankshaft. 18. A four-cycle engine for mounting in an engine room of a body of a snowmobile, the engine comprising:a crankcase having a crankshaft arranged along a body width direction of the snowmobile; a cylinder block having a central axis which is tilted rearward with respect to a vertical direction of the body of the snowmobile; an intake system including an intake manifold situated behind the central axis of the cylinder block; an alternator driven by rotation of the crankshaft, the alternator being disposed behind the cylinder block and beneath the intake system; an oil filter situated in front of the crankcase, the oil filter having an oil filter central axis which is oriented upwards and frontwards. 19. The engine of claim 18, further comprising a water pump situated above the crankcase and in front of the cylinder block.20. The engine of claim 19, wherein the oil filter is situated vertically below the water pump.21. A four-cycle engine for mounting in an engine room of a body of a snowmobile, the engine, comprising:a crankcase having a crankshaft arranged along a body width direction of the snowmobile; a cylinder block having a central axis which is tilted rearward with respect to a vertical direction of the body of the snowmobile; an oil filter situated in front of the crankcase, the oil filter having an oil filter central axis which is oriented upwards and frontwards.