Husqvarna 2011 SMS 125, Руководство по ремонту

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G.8
H06568
3
ENGINE OVERHAUL
Ed. 05-2011
Piston rings
Visually check the piston ring and the relevant seat in the piston.
If the piston ring is worn or damaged, it has to be replaced (the set is available
as spare part).
If the piston ring seat is worn or damaged as well, both piston and piston ring
shall be replaced.
When a new piston ring is fitted on a used piston, make sure that the piston ring
seat is not unevenly worn.
The piston ring should be positioned perfectly parallel to the groove surfaces in
the piston. Otherwise, the piston shall be replaced.
Piston ring height
The table shows the values of the axial clearance between lower, upper piston
ring and piston seat.
Piston ring to groove clearance
Piston ring to cylinder clearance
Insert the piston ring at the bottom of the bore (where minimum wear occurs)
taking care to position it squarely, and measure end gap.
Standard Max. size limit
0.978÷0.990 mm
(0.0385÷0.0390 in.)
0.96 mm
(0.038 in.)
H06569
3
H06570
3
Standard Max. size limit
0.030÷0.062 mm
(0.00118÷0.00244 in.)
0.18 mm
(0.0071 in.)
Standard Max. size limit
0.15 -0.30 mm
(0.0059÷0.0118 in.)
0.50 mm
(0.0196 in.)