Technical Information · issue 14 of 1995
New version with decompression valve
IssueTI 14/1995
Full text
Page 1 of 3
Technical Information
14.95
Cutquik STIHL TS 460 - type 4221
New version with decompression valve
The STIHL TS 460 Cutquik will be available with a This reduces the physical effort required to start
decompression valveK================================the machine and improves the operating con-
venience. The valve is opened manually and
This valve reduces the pressure in the combustion closes automatically as soon as combustion of the
chamber when starting the machine so that less fuel-air mixture starts.
force is required to pull the starter rope.
)Technical Information 14.95 - Page 2
Mechanical design and function
The housing (1) and valve (2) are the most
important elements of the decompression valve.
The piston can move axially in the housing.
A cone is fitted at the bottom end.
Three spring-loaded balls offset at angles of
120 degrees hold the piston in its upper and lower
limit position. The complete decompression valve
is screwed into the cylinder.
3
1
337TI002
Before starting, the valve (2) is forced into the lower
limit position and the cone lifts off the housing (1).
The decompression valve is now open.
Some of the pressure in the cylinder can now
escape through the hole (see arrow) in the valve.
The remaining mixture in the cylinder is compressed,
but the resultant pressure remains below the
closing pressure of the decompression valve.
3
The pressure in the cylinder cannot rise above the 1
closing pressure of the decompression valve until the
fuel-air mixture ignites. The valve (2) is then forced
upwards and the hole is sealed by the cone.
2
337TI003
Service notes
The decompression valve can be installed and
removed with a commercially available, deep well
socket wrench, size 13 Tightening torque 14 Nm.
It is advisable temporarily to remove the
decompression valve and seal the threaded bore
with a plug, No. 1122 025 2200, in order to test the
power unit for leaks.
)Technical Information 14.95 - Page 3
New replacement parts
Designation Part Number Item Comments MAM
H
Cylinder with piston 4221 020 1201 1
Decompression valve 4221 020 9400 1
Shroud; 4221 080 1602 1 1
includes Items 2, 3 and 4:
Grommet 4221 084 7400 2 10
Rating plate 4221 967 1501 3 10
Instruction plate 0000 967 3673 4 5
Plug 1122 025 2200 1)
&RPPHQWV
1) Special accessory for service shops
Last technical information on the STIHL TS 460 Cutquiks: 02.94
Waiblingen, February 8, 1995 Andreas Stihl - D1/MTK-sc
1995 Andreas Stihl Technical Documentation Page 2 of 3
Page 3 of 3
Extracted from the manufacturer's 2012 service catalogue. Most of these PDFs embed fonts with a shifted character map, so the text above was recovered rather than copied — read it as a faithful but imperfect transcription, and treat the page image above each block as the authority where the two disagree — the figures exist only there, because they are vector drawings that text extraction cannot keep.