Checking The Piston Ring End Gap; Measuring The Piston/Cylinder Mounting Clearance - Husqvarna FC 450 2018 Repair Manual

17.4.19

Checking the piston ring end gap

17.4.20

Measuring the piston/cylinder mounting clearance

-
Measure the piston at the piston skirt, at right angles to the
piston pin, at a distance f) .
Guideline
Distance f)
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
-
Using special tool
Guideline
Piston ring end gap
310062-10
Compression ring
Oil scraper ring
I
Feeler gauge (590290411 00)
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.
D04965-10
7 mm (0.28 in)
94.93 ... 94.96 mm (3.7374
... 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)
O.
measure the end gap.
I �
1 .00 mm (� 0.0394 in)
I �
1.20 mm(� 0.0472 in)
(0 p. 311)
(0 p. 199)
(IUI p. 199)
(0 p. 200)
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