HUSABERG FE 450 AUS, Repair Manual

Page: 122 / 285

30/ENGINE - WORK ON THE INDIVIDUAL PARTS
120
19.18
Checking/measuring the cylinder
400374-10
–
Check the cylinder bearing surface for damage.
» If the cylinder bearing surface is damaged:
–
Change the cylinder and piston.
–
Measure the cylinder diameter at several locations on the

‑
and

‑
axes using a
micrometer to identify oval wear.
Guideline
Cylinder - drill hole diameter (All 450 models)
Size I 95.000… 95.012 mm (3.74015…
3.74062 in)
Size II 95.013… 95.025 mm (3.74066…
3.74113 in)
Cylinder - drill hole diameter (All 570 models)
Size I 100.000… 100.012 mm (3.937…
3.93747 in)
Size II 100.012… 100.025 mm (3.93747…
3.93798 in)
200162-10
–
Cylinder size

is marked on the side of the cylinder.
400376-10
–
Using a straightedge and the special tool, check the sealing area of the cylinder
head for distortion.
Feeler gauge (59029041100) ( p. 269)
Cylinder/cylinder head - sealing area
distortion
≤
0.10 mm (
≤
0.0039 in)
» If the measured value does not meet specifications:
–
Change the cylinder.
19.19
Checking/measuring the piston
300355-10
–
Check the piston sliding surface for damage.
» If the piston sliding surface is damaged:
–
Replace the piston and, if necessary, the cylinder.
–
Check that the piston rings move easily in the piston ring grooves.
» If a piston ring exhibits excessive resistance:
–
Clean the piston ring groove.
Tip
An old piston ring can be used to clean the piston ring groove.
–
Check the piston rings for damage.
» If the piston ring is damaged:
–
Replace the piston ring.
Info
Mount the piston ring with the marking facing upward.
–
Check the piston pins for discoloration or signs of wear.