Cylinder To Piston Clearance; Piston Pin - Husqvarna WRE 125 2011 Workshop Manual

Cylinder
Abbreviation
A-B or BLACK-BLUE
C-D or PINK-GREEN
E-F or RED-WHITE
Ed. 05-2011
ENGINE OVERHAUL

Cylinder to piston clearance

The piston-cylinder units are supplied already coupled; should the cylinders
and pistons of some units have been accidentally mixed up, it will be necessary
to measure the diameters as outlined in the previous paragraphs.
Take these measurements at a stabilised temperature of 20°C.
Preferential clearance DN-D1 = 0.035÷0.055 mm
(0.00138÷0.00216 in.)
Wear limit 0.080 mm (0.00315 in.).
H06566
Size Abbreviation
53.985÷53.995
(2.1254÷2.1258)
53.995÷54.005
(2.1258÷2.1262)
54.005÷54.015
(2.1262÷2.1266)

Piston pin

It must be perfectly smooth, with no signs of scuffing, dents or bluing due to
overheating. Check the piston pin to piston clearance: it shall be 0.002÷0.009
mm (0.000079÷0.000354 in.). Wear limit 0.012 mm (0.0005 in.). When replac-
ing the piston pin it is also necessary to replace the needle roller bearing cage
(in compliance with what specified in the paragraph "piston pin-piston-connect-
ing rod small end clearance").
H06567
3
Piston
Size
53.940÷53.950
A - B
(2.1236÷2.1240)
53.950÷53.960
C - D
(2.1240÷2.1244)
53.960÷53.970
E - F
(2.1244÷2.1248)
3
G.7
Clearance
from 0.035 (0.00138 in.)
to 0.055 (0.00216 in.)
from 0.035 (0.00138 in.)
to 0.055 (0.00216 in.)
from 0.035 (0.00138 in.)
to 0.055 (0.00216 in.)