Tolerance, Engine Wear Limits; Engine Tightening Torques - Husqvarna FS 450 2019 Repair Manual

25.2

Tolerance, engine wear limits

Camshaft - cam height
Exhaust
Intake
Valve spring
Minimum length, intake (without valve spring
seat)
Minimum length, exhaust (without valve spring
seat)
Valve spring seat
Cylinder/cylinder head - sealing area distortion
Piston - diameter
Size I
Size II
Cylinder - drill hole diameter
Size I
Size II
Piston/cylinder - mounting clearance
Size I
Size II
Wear limit
Piston ring end gap
Compression ring
Oil scraper ring
Piston ring - groove clearance
Connecting rod - end play of lower conrod bearing
Crankshaft - axial play
Crankshaft - run-out on bearing pin
Clutch disc pack - thickness
Wear limit
Oil pressure control valve
Minimum length of pressure spring
Shift shaft - play in sliding plate/shift quadrant
25.3

Engine tightening torques

Screw, oil jet for piston cooling
Crankshaft speed sensor screw
and cable retainer
Oil nozzle for clutch lubrication
Oil nozzle for timing chain lubrica-
tion
Oil nozzle, piston cooling
33.10 ... 33.30 mm (1.3031 ... 1.311 in)
33.90 ... 34.10 mm (1.3346 ... 1.3425 in)
40. 7 mm (1 .602 in)
40. 7 mm (1 .602 in)
1.9 ... 2.1 mm (0.075 ... 0.083 in)
s 0.10 mm (S 0.0039 in)
94.93 ... 94.96 mm (3.7374 ... 3.7386 in)
94.94 ... 94.97 mm (3. 7378 ... 3. 739 in)
95.000 ... 95.012 mm (3.74015 ... 3.74062 in)
95.013 ... 95.025 mm (3.74066 ... 3.74113 in)
0.040 ... 0.082 mm (0.00157 ... 0.00323 in)
0.043 ... 0.085 mm (0.00169 ... 0.00335 in)
0.120 mm (0.00472 in)
s 1.00 mm (S 0.0394 in)
s 1.20 mm (s 0.0472 in)
s 0.08 mm (S 0.0031 in)
0.20 ... 0.45 mm (0.0079 ... 0.0177 in)
0.50 ... 0.60 mm (0.0197 ... 0.0236 in)
s 0.16 mm (s 0.0063 in)
� 26.4 mm (� 1 .039 in)
22.1 mm (0.87 in)
0.40 ... 0.80 mm (0.0157 ... 0.0315 in)
M4
M5
M5
M5
M5
TECHNICAL DATA 25
2 Nm (1.5 lbf ft)
Loctite
6 Nm (4.4 lbf ft)
Loctite
2 Nm (1.5 lbf ft)
Loctite
2 Nm (1.5 lbf ft)
Loctite
2 Nm (1.5 lbf ft)
Loctite
®
243
™
®
243 ™
®
243
™
®
243
™
®
243
™
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