Cylinder head lower wall 16 extends over and closes {HEAD ~ opening} 14 of {TAIL ~ each cylinder} 12, while a piston upper portion 18 closes an opening at the lower end of each cylinder 12 
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Cylinder head lower wall 16 extends over and closes { HEAD ~ opening } 14 of { TAIL ~ each cylinder } 12 , while a piston upper portion 18 closes an opening at the lower end of each cylinder 12
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH