Husqvarna SMS4, Workshop Manual

Page: 49 / 136

F1.13 Part. N. 8000 H4704 (07-2010)
17
18
ENGINE OVERHAUL
CAmsHAft CHECk
1. Check:
• Camshaft lobes
Discoloured blue/pittings/scratches Replace the
camshaft.
2. measure:
• Dimensions of camshaft lobes "a" and "b"
Not conforming to specifications Replace the camshaft.
(see fig. 17)
3. Check:
• Camshaft oil gallery
Obstruction Clean with a compressed air jet.
ROCkER ARm ANd ROCkER ARm sHAfts CHECk
• The following procedure can be applied to all rocker arms and
rocker arm shafts.
1. Check:
• Rocker arm
Damage/wear Replace.
2. Check:
• Rocker arm shaft
Discoloured blue/excessive wear/pittings/scratches Replace
or check lubrication system.
3. measure:
• Rocker arm "a" inside diameter
Not conforming to specifications Replace. (see fig. 18)
4. measure:
• Rocker arm shaft "a" outside diameter
Not conforming to specifications Replace. (see fig. 18)
Camshaft lobe dimensions •
Intake A •
30.225-30.325mm (1.1900-1.1939 in)
Limit •
30.125 mm (1.1860 in)
Intake b •
25.114-25.214mm (0.9887-0.9927in)
Limit •
25.014mm (0.9848in)
Exhaust A
30.261-30.361mm (1.1914-1.1953in)
Limit •
30.161mm (1.1874in)
Exhaust B •
25.172-25.272mm (0.9910-0.9950in)
Limit •
25.072mm (0.9871in)
Rocker arm inside diameter 9.985-10.000 mm •
(0.3931-0.3937 in)
Limit 10.015 mm (0.3943 in) •
Rocker arm outside diameter 9.966-9.976 mm •
(0.3924-0.3928 in)
Limit 9.941 mm (0.3914 in) •