Piston Ring Installation Instructions

Supercircle piston rings are designed to give original performance. Their correct fitment, suitable ring end gaps and proper side & back clearances in individual pistons leads to long life of engines, less oil consumption and increased power output. The piston ring installation instructions are as follows:

Piston Ring Installation Instructions

  1. Remove wear ridge on cylinder walls before removing pistons. Failure to do this may lead to cracked or broken piston ring lands. Use a good ridge cutter to do this.
  2. Remove glaze of the cylinder bores by light honing or by a glaze breaker.
  3. Thoroughly clean the cylinder walls to remove all grit and carbon and smear them with light engine oil.
  4. Check the size of the cylinder bores and correctly choose the size of rings for trouble-free performance. Piston Rings are available from standard size to different oversizes for all engines.
  5. Chromium plated piston rings must not be used in chromium plated cylinder liners.
  6. Place the new ring set in individual cylinder bores and check for correct ring end gaps. The normal recommended ring end gaps of rings for internal combustion engines are as follows:
    Diameter Min.
    Compression Oil
    50.0-62.5
    [2”-2.1/2”]
    0.20
    [.008”]
    0.15
    [.006”]
    62.5-75.0
    [2.1/2”-3”]
    0.25
    [.010”]
    0.20
    [.008”]
    75.0-100.0
    [3”-4”]
    0.30
    [.012”]
    0.25
    [.010”]
    100.0-125.0
    [4”-5”]
    0.40
    [.016”]
    0.30
    [.012”]
    125.0-150.0
    [5”-6”]
    0.50
    [.020”]
    0.40
    [.016”]
    150.0-175.0
    [6”-7”]
    0.60
    [.024”]
    0.50
    [.020”]

    Air compressor  : Minimum 0.001” per inch of bore.

  7. Check the pistons for wear on grooves, gudgeon pin bosses or the body before fitting new rings.
  8. Clean the piston for carbon or excess scales by thoroughly washing them either with petrol or kerosene, using a wire brush. Clean the oil holes by a wire or drill.
  9. Install a new set of rings on pistons and check the side clearance and back clearance. The recommended limit for side clearance is 0.10 mm. The recommended ring back clearance in piston grooves is a minimum of 0.20 mm clearance between back of the ring and bottom of the groove.
  10. The piston ring installation procedure on the piston is as follows:
  11. Oil all the piston grooves.
  12. Start assembling rings from the bottom groove and finish at the top.
  13. For dressing rings on piston, use a good ring plier to avoid ring breakage during assembly.
  14. Place the ring end gaps in different directions in piston grooves before assembling into the engine to avoid blow-by and oil consumption.
  15. Correctly assemble all rings as per the order to avoid mismatching.
  16. Rings with ‘TOP’ mark should be installed with ‘TOP’ mark towards top of the piston.
  17. When spring loaded rings are used, first screw in the hook of the latch into one end of the helical coil spring for half of its length. Then assemble the helical coil spring into the groove and slide the oil ring over this. Ensure the coil spring is properly seated with its latched end opposite to the open end of the ring. The spring loaded ring is generally fitted in the oil groove just above the gudgeon pin.
  18. When 3 piece oil control rings are used, first install the spring spacer in the oil groove, placing the end in line with the piston pin hole. Ensure that the ends are butting and not overlapping. Install the upper side rail on the spacer by putting one end of the side rail into the groove and then gently pushing in the side rail with fingers. Keep the rail end gap 45 degree from the spring spacer end. Then install the lower side rail in exactly the same manner and keep its gap 45 degrees on the opposite side of the spring spacer end. Make sure that the oil ring set can be smoothly moved by hand.
  19. In the case of piston with rotation prevention in the ring grooves, care must be taken to ensure that the ring gaps are positioned alongside the securing pins.