Checking The Piston Ring End Gap; Measuring The Piston/Cylinder Mounting Clearance - Husqvarna FS 450 2016 Repair Manual

17 ENGINE
17 .4.17
17.4.18
198

Checking the piston ring end gap

310062-10

Measuring the piston/cylinder mounting clearance

310060-10
If the piston pin seating has excessive play:
-
Replace the piston and, if necessary, the cylinder and
piston pin.
-
Measure the piston at the piston skirt, at right angles to the
piston pin, at a distance f).
Guideline
G
Distance
Piston - diameter
Size I
Size II
Info
Piston dimensions
-
Remove the piston ring from the piston.
-
Place the piston ring in the cylinder and align with the piston.
Guideline
Below the upper edge of the
cylinder
O,
-
Using special tool measure the end gap.
Guideline
Piston ring end gap
Compression ring
Oil scraper ring
I Feeler gauge (59029041100)
If the end gap is greater than the specified value:
-
Check/measure the cylinder.
If cylinder wear lies within the specified tolerance:
-
Change the piston ring.
-
Mount the piston ring with the marking facing upward.
-
Check/measure the cylinder.
-
Check/measure the piston.
-
The smallest piston/cylinder mounting clearance equals the
smallest cylinder bore diameter minus the largest piston
diameter. The largest piston/cylinder mounting clearance
equals the largest cylinder bore diameter minus the smallest
piston diameter.
7 mm (0.28 in)
94.93 ... 94.96 mm (3. 737 4
... 3.7386 in)
94.94 ... 94.97 mm (3.7378
... 3.739 in)
O
are marked on the piston head .
10 mm (0.39 in)
I :5 1.00 mm (:5 0.0394 in)
I :5 1.20 mm (:5 0.0472 in)
(� p. 295)
(� p. 196)
(� p. 196)
(� p. 197)
..
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