Checking/Measuring The Piston - KTM 2014 690 SMC R EU Repair Manual

16 ENGINE

16.4.13 Checking/measuring the piston

–
The cylinder size
305588-10
–
Check the sealing area of the cylinder head for distortion using a straight edge and
the special tool.
Feeler gauge (59029041100) (
Cylinder/cylinder head - sealing area
distortion
» If the measured value does not equal the specified value:
–
Change the cylinder.
305589-10
–
Use the special tool to measure play
groove.
Guideline
Piston ring - groove clearance
Feeler gauge (59029041100) (
»
If play
–
Change the piston and piston rings.
305604-10 –
Check/measure the cylinder. (
–
Check the piston bearing surface for damage.
» If the piston bearing surface is damaged:
–
Change the piston and, if necessary, the cylinder.
–
Check that the piston rings can move easily in the piston ring grooves.
» If the piston ring is stiff:
–
Clean the piston ring groove.
305645-10
–
Check the piston rings for damage.
» If the piston ring is damaged:
–
Change the piston ring.
–
Check the piston pin for discoloration or signs of wear.
» If the piston pin has strong discoloration/signs of wear:
–
Change the piston pin.
–
Insert the piston pin into the connecting rod and check the bearing for play.
» If the piston pin bearing has too much play:
–
Change the connecting rod and the piston pin.

is marked on the side of the cylinder.
p. 230)

p. 230)

is greater than the specified value:
Tip
Use an old piston ring to clean the piston ring groove.
Info
Mount the piston ring with the marking facing upward.
≤ 0.10 mm (≤ 0.0039 in)
of the piston rings in the piston ring
≤ 0.08 mm (≤ 0.0031 in)
p. 132)
133