Rings
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Rings. Compression and Oil Control Rings. Ring Locations. Top Ring Second Ring Oil Rings. Compression Ring Design. Compression rings must: Seal combustion pressure Aid the oil rings in controlling oil Transfer heat to the cylinder walls. Compression Ring Design. Materials Cast iron

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Rings

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Rings

Rings

Compression and Oil Control Rings


Ring locations

Ring Locations

  • Top Ring

  • Second Ring

  • Oil Rings


Compression ring design

Compression Ring Design

  • Compression rings must:

    • Seal combustion pressure

    • Aid the oil rings in controlling oil

    • Transfer heat to the cylinder walls


Compression ring design1

Compression Ring Design

  • Materials

    • Cast iron

    • Ductile Iron


Ring shapes

Ring Shapes


Ring end gaps

Ring End Gaps

  • Butt gap – most common

  • Lap joint – Childs & Alberts gapless ring

  • Bevel joint


Ring actions

Ring Actions

  • Scraping – on intake stroke rings scrape excess oil from the cylinder wall

  • Oil sealing – during the compression and exhaust events the rings ride on a film of oil (reduces friction and wear)

  • Gas loading – during the power event, the top ring is forced out against the cylinder wall by the cylinder pressure


Compression ring coatings

Compression Ring Coatings

  • Chromium

    • Approx .0004” thick coating

    • Very hard and wear resistant

    • Takes longer to break in

    • Proper cylinder preparation very important


Compression ring coatings1

Compression Ring Coatings

  • Molybdenum (Moly)

    • .004” - .008” groove cut in ring face

    • Molten molybdenum is then sprayed into the groove

    • High melting point (Moly - 4750 F, cast iron – 2250 F, chromium – 3350 F)

    • Soft and porous

      • Retains oil

      • Combats scuffing

      • Short break in period


Oil control rings

Oil Control Rings

  • Removes excess oil from the cylinder wall and returns it to the crankcase

  • The bottom rail scrapes oil directly into the crankcase

  • The top rail forces the oil through the oil drain back slots/holes in the piston and back into the crankcase


Oil control ring designs

Oil Control Ring Designs


Ring installation

Ring Installation

  • Check:

    • Ring end gap

      • Use piston to square rind in bore approx 1 “ from the top and use feeler gauge to measure

      • Rule of thumb - .003” - .004” of gap for every inch of cylinder bore

      • If gap is too tight use a piston ring filer to widen gap

    • Ring side clearance – use feeler gauge


Ring installation1

Ring Installation

  • Use a piston ring installer to avoid breaking rings, warping rings or scratching the piston


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