Husqvarna HS 139A Workshop Manual page 46

Part
Connecting rod
Crankshaft pin
Valve, inlet valve
Valve, exhaust valve
Valve stem, inlet valve
Valve stem, exhaust valve
Valve guide
Stem to guide, inlet valve
Stem to guide, exhaust valve
Valve seat
Valve spring
Camshaft, inlet valve
Camshaft, exhaust valve
Camshaft
Crankcase cover
Spark plug
Ignition coils, primary
Ignition coils, secondary
Ignition coils - flywheel
7
Subtract the inner diameter of the intake valve guide with the outer diameter of the intake valve stem.
8
Subtract the inner diameter of the exhaust valve guide with the outer diameter of the exhaust valve stem.
46 - Technical data
Tool Standard dimension
Feeler gauge Axial clearance: 0.10-0.70
mm / 0.004-0.028 in.
Micrometer Outer diameter:
25.980-25.993 mm /
1.0228-1.0228 in.
Feeler gauge Clearance: 0.10-0.15 mm /
0.0039-0.0059 in
Feeler gauge Clearance: 0.15-0.2 mm /
0.0059-0.0078 in.
Micrometer Outer diameter: 5.480 mm /
0.2160 in.
Micrometer Outer diameter: 5.440 mm /
0.2140 in.
Micrometer Inner diameter: 5.500 mm /
0.2170 in.
7
Clearance: 0.010-0.034 mm /
0.0004-0.0013 in.
8
Clearance: 0.050-0.070 mm /
0.0020-0.0028 in.
Micrometer Width:0.7 mm / 0.028 in.
Micrometer Free length: 34.5 mm / 1.36 in. Free length: 33.5 mm / 1.32 in.
Micrometer Height:27.553 mm / 1.085 in.
Micrometer Height: 27.701 mm /1.091 in.
Micrometer Outer diameter: 13.984 mm /
0.5506 in.
Micrometer Inner diameter: 14.0 mm / 0.55
in.
Feeler gauge Gap: 0.7-0.8 mm /
0.027-0.0314 in.
Multimeter 8.0-1.0 Ω
Multimeter 5.9-7.1 Ω
Feeler gauge Clearance: 0.4±0.2
Wear limit
Axial clearance: 1.1 mm /
0.043 in.
Outer diameter: 25.920mm /
1.0205 in.
NA
NA
Outer diameter: 5.318 mm /
0.2094 in.
Outer diameter: 5.275 mm /
0.2077 in.
Inner diameter: 5.572 mm /
0.2194 in.
Clearance: 0.100 mm / 0.0040
in
Clearance: 0.120 mm / 0.0050
in.
Width: 2.0 mm / 0.08 in.
Cam height: Replace under
27.30 mm / 1.075 in.
Cam height: Replace under
27.40 mm / 1.079 in.
Outer diameter: 13.916 mm /
0.5479 in.
Inner diameter: 14.048 mm /
0.5530 in.
NA
NA
NA
NA
1425 - 001 - 03.06.2020