Piston rings
Posting Guru
Joined: Feb 2001
Posts: 1,465
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From: Indianapolis
Piston rings
It is a conventional design in which there is a primary (top) compression ring (a keystone ring), a secondary compression ring and a 1 piece oil ring with an expander behind it. If you look at the piston there is a heat dam between the top ring and the second ring (I think that's right) which looks like a ring belongs there but it doesn't. I hope this answers your question.
Posting Guru
Joined: Feb 2001
Posts: 1,465
Likes: 2
From: Indianapolis
Piston rings
The piston would track just fine but that cylinder would have low compression if the top ring were missing. If the second compression ring were missing, the engine would have high oil consumption as it would if the oil ring were missing. The secondary compression ring is a scraper and does more to aid oil control than aiding compression.
What keeps the piston tracking properly is the piston skirt and the piston skirt clearance.
What keeps the piston tracking properly is the piston skirt and the piston skirt clearance.
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