Emergency Care and Transportation of the Sick and Injured ...

7. Piston head is exposed to extremes of heat and pressure during combustion. 8. Grooves hold piston sealing rings. a. Piston rings provide a seal between outside of piston and inside of cylinder wall. b. Three rings are used. i. Upper two rings are compression rings (a) Prevent combustion pressure (called blowby gas) ii. Lower piston ring is ... ................
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