Yamaha 5TE-F8197-10, LIT-11616-16-02 3rd step, Checking the Piston Rings, Side clearance

CYLINDER AND PISTON

ENG

3rd step:

●Find the piston-to-cylinder clearance with the following formula.

Piston-to-cylinder clearance = Cylinder bore “C” – Piston skirt diameter “P”

Piston-to-cylinder clearance: 0.040 ~ 0.065 mm

(0.0016 ~ 0.0026 in)

<Limit>: 0.150 mm (0.0059 in)

●If out of specification, rebore or replace the cylinder, and replace the piston and piston rings as a set.

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CHECKING THE PISTON RINGS

1.Measure:

●Piston ring side clearance

Use a feeler gauge.

Out of specification → Replace the piston 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	0.03 ~ 0.08 mm	0.13 mm
ring	(0.0012 ~ 0.0031 in)	(0.0051 in)
2nd	0.03 ~ 0.07 mm	0.13 mm
ring	(0.0012 ~ 0.0028 in)	(0.0051 in)

2.Position:

●Piston ring (in cylinder)

NOTE:

Insert a ring into the cylinder and push it approximately 40 mm (1.6 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.

a 40 mm (1.6 in)

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