Checking Piston Ring End Gap; Determining The Piston/Cylinder Mounting Clearance; Checking The Oil Pumps For Wear - KTM 2014 690 SMC R EU Repair Manual

16 ENGINE

16.4.14 Checking piston ring end gap

16.4.15 Determining the piston/cylinder mounting clearance

16.4.16 Checking the oil pumps for wear

Info
The oil pump wear check shown here is on the suction pump but it applies to all oil pumps.
–
Measure the piston at the piston skirt, at right angles to the piston pin, at a

distance
Guideline
Distance
Piston - diameter
Size I
Size II
305603-10
Info
Piston size
–
Remove the piston ring from the piston.
–
Place the piston ring in the cylinder and align it with the piston.
Guideline
Under the upper edge of the cylinder
–
Measure the end gap with a feeler gauge
Guideline
Piston ring end gap
Compression rings
305590-10
Oil scraper ring
» If the end gap is more than the specified value:
–
Check/measure the cylinder. (
» If the cylinder wear is within the tolerance range:
–
Change the piston ring.
–
Mount the piston ring with the marking facing toward the piston head.
–
Check/measure the cylinder. (
–
Check/measure the piston. (
–
The smallest piston/cylinder mounting clearance is the result of the smallest cylin-
der bore diameter minus the largest piston diameter. The largest piston/cylinder
mounting clearance is the result of the largest cylinder bore diameter minus the
smallest piston diameter.
Guideline
Piston/cylinder - mounting clearance
New condition
305645-10
Wear limit
–
Use a feeler gauge
engine case as well as between the external rotor and the internal rotor.
Oil pump
Clearance between external rotor
and engine case
Clearance between external rotor
and internal rotor
Axial clearance
305663-10
.


is marked on the piston head.
p. 132)
p. 133)

to measure the play between the external rotor and the
31.5 mm (1.24 in)
101.955... 101.965 mm (4.01397...
4.01436 in)
101.965... 101.975 mm (4.01436...
4.01476 in)
10 mm (0.39 in)
 .
≤ 0.80 mm (≤ 0.0315 in)
≤ 1.00 mm (≤ 0.0394 in)
p. 132)
0.035... 0.060 mm (0.00138...
0.00236 in)
0.10 mm (0.0039 in)
≤ 0.20 mm (≤ 0.0079 in)
≤ 0.20 mm (≤ 0.0079 in)
0.04... 0.08 mm (0.0016...
0.0031 in)
134