Checking/Measuring The Piston - Husqvarna FE 450 2016 Repair Manual

18 ENGINE
18.4.16
208
304689-10
304696-10

Checking/measuring the piston

304698-10
O
-
The cylinder size is labeled on the side of the cylinder.
-
Using a straightedge and the special tool, check the sealing
area of the cylinder head for distortion.
I Feeler gauge (59029041100)
Cylinder/cylinder head
sealing area distortion
If the measured value does not meet specifications:
-
Change the cylinder.
-
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 the piston ring is stiff:
-
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
I
Mount the piston ring with the marking facing
upward.
-
Check the piston pins for discoloration or signs of wear.
If the piston pin shows severe discoloration/signs of wear:
-
Replace the piston pin.
-
Place the piston pin in the connecting rod and check the
seating for play.
If the piston pin seating has excessive play:
-
Replace the connecting rod and piston pin.
(I!!;! p. 357)
:5 0.10 mm (:5 0.0039 in)
..