STANDARD PROCEDURE - PISTON RING FITTING

Before reinstalling used rings or installing new rings, the ring clearances must be checked.





NOTE: The ring gap measurement must be made with the ring positioned at least 12mm (0.50 inch.) from bottom of cylinder bore.



PISTON RING SIDE CLEARANCE

NOTE: Make sure the piston ring grooves are clean and free of nicks and burrs.






PISTON RING SPECIFICATION CHART

Ring Position
  		Ring/Groove
  		Maximum
  
 Side Clearance
  		Clearance
  
Upper Ring
  		0.02-0.07mm
  		0.11mm
  
 (0.0008- 0.0028 in.)
  		(0.004 in.)
  
Intermediate Ring
  		0.02-0.06 mm
  		0.10mm
  
 (0.0008-0.0023 in.)
  		(0.004 in.)
  
Ring Position
  		Ring Gap
  		Wear Limit
  
Upper Ring
  		0.30-0.40mm
  		0.45mm
  
 (0.0118-0.0157 in.)
  		(0.0177 in.)
  
Intermediate Ring
  		0.35-0.60mm
  		0.74mm
  
 (0.0137-0.0236 in.)
  		(0.029 in.)
  
Oil Control Ring
  		0.020-0.71mm
  		0.76mm
  
(Steel Rail)
  		(0.0078- 0.0279 in.)
  		(0.030 in.)
  


NOTE: Piston rings are installed in the following order:

  • Oil ring expander.
  • Lower oil ring side rail.
  • Upper oil ring side rail.
  • No. 2 Intermediate piston ring.
  • No. 1 Upper piston ring.