Yamaha 5HN-28199-13, LIT-11626-16-27 NOTE:, Limit, NOTE:, NOTE:, Limit, 0.4 mm, 0.4 mm, 0.12 mm, 0.12 mm, End gap, Standard, Top ring, 2nd ring, Standard, 2nd ring, ~ 0.7 mm, ~ 0.25 mm

CYLINDER AND PISTON ENG

Piston ring

1.Measure:

●Ring side clearance

Use a feeler gauge.

Out of specification → Replace the pis- ton and rings as a set.

NOTE:

Clean carbon from the piston ring grooves and rings before measuring the side clearance.

	Side clearance
	Standard	Limit
Top ring	0.030 ~ 0.065 mm	0.12 mm
	(0.0012 ~ 0.0026 in)	(0.005 in)
2nd ring	0.020 ~ 0.055 mm	0.12 mm
	(0.0008 ~ 0.0022 in)	(0.005 in)

2.Position:

●Piston ring (in cylinder)

NOTE:

Insert a ring into the cylinder and push it approximately 5 mm (0.20 in) into the cylinder. Push the ring with the piston crown so that the ring will be at a right angle to the cylinder bore.

a5 mm (0.20 in)

3.Measure:

●Ring end gap

Out of specification → Replace.

NOTE:

You cannot measure the end gap on the expander spacer of the oil control ring. If the oil control ring rails show excessive gap, replace all three rings.

		End gap
	Standard		Limit
Top ring	0.10	~ 0.25 mm	0.4 mm
	(0.004 ~ 0.010 in)		(0.016 in)
2nd ring	0.10	~ 0.25 mm	0.4 mm
	(0.004 ~ 0.010 in)		(0.016 in)
Oil ring	0.2	~ 0.7 mm	—
	(0.01 ~ 0.03 in)

4 - 24