Engine
An engine includes a crankshaft, a piston coupled to the crankshaft, and a head positioned over the piston and cylinder. The head includes a first aperture therethrough profiled for a spark plug. The engine also includes at least one camshaft positioned in the head and a cam retainer positioned over the camshaft to retain the camshaft in the head. The cam retainer includes a second aperture profiled to at least partially overlie the first aperture. The cam retainer is in a sealed relation with the head at the interface of the first and second apertures. The engine also includes a valve cover receivable over the head and cam retainer and including a third aperture therethrough, the third aperture being profiled to at least partially overlie the second aperture, and the valve cover being in a sealed relation with the cam retainer at the interface of the second and third apertures.
1. An engine, comprising:
a crankcase;
a crankshaft journalled in the crankcase;
a piston coupled to the crankshaft;
a cylinder in which the piston reciprocates;
a head positioned over the piston and cylinder, the head including a first aperture therethrough profiled for a spark plug;
at least one camshaft positioned in the head;
a cam retainer positioned over the camshaft to retain a cam in the head, the cam retainer including a second aperture profiled to at least partially overlie the first aperture, and the cam retainer being in a sealed relation with the head at an interface of the first and second apertures;
a valve cover receivable over the head and cam retainer and including a third aperture therethrough, the third aperture being profiled to at least partially overlie the second aperture, and the valve cover being in a sealed relation with the cam retainer at an interface of the second and third apertures; and
a baffle plate positioned longitudinally above an upper surface of the cam retainer and supported on the valve cover.
2. The engine of claim 1 , wherein the cam retainer comprises an upstanding tubular wall which defines the second apertures.
3. The engine of claim 2 , wherein the upstanding tubular wall is cylindrical.
4. The engine of claim 3 , wherein the upstanding tubular wall defines a lower planar surface profiled to interface with an upper planar surface of the head.
5. The engine of claim 4 , further comprising a seal at the interface of the lower planar surface of the upstanding tubular wall and the upper planar surface of the head.
6. The engine of claim 2 , wherein the upstanding tubular wall defines an upper planar surface profiled to interface with a planar surface of the valve cover.
7. The engine of claim 6 , further comprising a seal at the interface of the upper planar surface of the upstanding tubular wall and the planar surface of the valve cover.
8. The engine of claim 1 , further comprising a duct coupled to the valve cover to release gases from the valve cover.
9. The engine of claim 1 , wherein the baffle plate includes a plate portion and baffles extending perpendicularly to the plate portion.
10. The engine of claim 1 , further comprising a seal positioned between the valve cover and the cam retainer, and the seal includes a channel configured to receive an upper end of a cylindrical portion of the cam retainer.
11. The engine of claim 1 , wherein the cam is received within a recess of the head and a recess of the cam retainer.