15 Valve Gear; Tools, Servicing Aids; Disassembling / Assembling Valve Gear - Stihl 4180 Series Service Manual

15 Valve Gear

19
18
17
16
15
14
13
15.1

Tools, Servicing Aids

Socket, T27x125 – 0812 542 2104
–
Setting gauge – 4180 893 6400
–
Locking screw – 4282 890 2700
–
Torque wrench – 5910 890 0302
–
Torque wrench – 5910 890 0312
–
Screwdriver, T27x200 – 5910 890 2415
–
Screwdriver, Q-SW 8x200 – 5910 890 2420
–
Socket, 13 mm, long – 5910 893 2804
–
Dirko HT red sealant – 0783 830 2000
–
15.2

Disassembling / Assembling Valve Gear

Removing rocker arm, pushrod
Remove the shroud, @ 4.2.
N
Clean area around valve cover (18).
N
Take out the screw (20) and remove together with
N
sealing ring (19), valve cover (18) and gasket (17).
Unscrew and remove the nut (16).
N
Remove the sleeve (15).
N
Remove the rocker arm (14).
N
Take out the pushrod (3).
N
Installing rocker arm, pushrod
Fit the pushrod (3).
N
Fit the rocker arm (14).
N
38
20
M5x30 (5 Nm / 44 lbf. in.)
1
2
12
M5x16
11
(9 Nm / 80 lbf. in.)
3
4
5
6
7
8
6
10
M8x1 (17 Nm / 150 lbf. in.)
Fit the sleeve (15).
N
Screw nut (16) onto the collar screw (12).
N
Adjust valve clearance, @ 15.3.
N
Fit gasket (17) in the valve cover (18).
N
Place valve cover (18) in position, fit screw (2) with
N
new sealing ring (19) and tighten down.
Removing the valves
1
13
Remove rocker arm and pushrod, @ 15.2.
N
Remove the crankshaft, @ 16.9.
N
Press the valve spring retainer (1) down and move it
N
sideways until the valve stem is in the large hole.
Remove the spring retainer (1) and valve spring (2).
N
Pull the valve (13) out of the cylinder.
N
9
D4x18 (4,5 Nm / 40 lbf. in.)
Series 4180 Powerhead