YAMADA Global Series, Maintenance Manual

Page: 7 / 18

4
4.2 Inspection
▪ Ball [Fig.4.9]
Measure the outside diameter, and if it is outside the usable
range, replace the ball.
Usable range of Ball
Sø0.669 ~ Sø0.760 in {Sø17.0 ~ Sø19.3 mm}
▪ O ring
If O ring is worn out or cracked, replace it.
Replace the PTFE O ring regardless of its condition.
■
A_, S_ Type
▪ Valve seat [Fig.4.10]
Measure the dimension shown at left, and if it is outside the
usable range, replace the valve seat.
Usable range of Valve seat
0.102 ~ 0.225 in {2.6 ~ 5.7 mm}
■
P_ Type
▪ Valve seat A [Fig.4.11]
Measure the dimension shown at left, and if it is outside the
usable range, replace the valve seat A.
Usable range of Valve seat A
0.055 ~ 0.071 in {1.4 ~ 1.8 mm}
▪ Valve seat B [Fig.4.12]
Measure the dimension shown at left, and if it is outside the
usable range, replace the valve seat B.
Usable range of Valve seat B
0.177 ~ 0.256 in {4.5 ~ 6.5 mm}
4.3 Installation
For installation, see [Exploded View] on the separate sheet and install in the reverse order of disassembly.
Tightening torque for manifold retainer bolts or nuts
AN, AS, SN, SS 105 in-lbf {12 N-m}
AT, ST 160 in-lbf {18 N-m}
PS, PT 89 in-lbf {10 N-m}
<NOTE>
▪ Make sure there is no dust on the seal surface and the seal
is not damaged.
Fig.4.11
Fig.4.12
Fig.4.9
Fig.4.10