Mistral Second Stage Technical Maintenance Manual
7
4. Using the crown adjusting tool (p/n 125727), engage the
slotted head of the crown (16) and drive it in clockwise as
far as the tool will allow. If the tool is not available, use a
medium blade screwdriver to drive the crown in as far as it
will go and then back it out 3 revolutions.
CAUTION :
If resistance is felt, immediately
stop and unscrew the valve body from the
inlet fi tting. To check the alignment of the
poppet shaft and poppet bearing. Excessive
force and misalignment will otherwise result
in damage to the poppet bearing, requiring
its replacement.
5. Press a new LP seat (15) into the cavity in the head of the
poppet (14), with the smooth side facing out.
NOTE:
It is essential to use a spare LP seat
in order to prevent damage to the new seat
while performing the following steps of the
reassembly procedure.
6. Stand the inlet fi tting (19) vertical on a fl at surface with the
sealing edge of the crown (16) facing up inside. Lay the
previously used LP seat (15) inside the inlet fi tting over the
sealing edge of the crown.
7. Place the poppet bearing (12) over the pin of the
extraction tool with the square feature facing up. Guide the
pin of the tool into the open end of the valve body (11) and
out through the square hole in it’s center. While sighting
through the top of the valve body, rotate the tool as needed to
align the square feature of the poppet bearing with the square
hole, and press the tool upward to seat the bearing securely
in place. When fi nished, check to ensure that the top of the
poppet bearing is fl ush with the top of the valve body.
8. Stand the poppet (14) on its head inside the top of the inlet
fi tting (19) and on top of the old LP seat. Place the spring (13)
over the poppet shaft (14).
9. Hold the inlet fi tting (19) secure and mate the valve body
(11) with poppet, bearing down over the poppet shaft (14).
Press the valve body downward to compress the spring while
turning it clockwise to engage the threads of the inlet fi tting.
Continue turning it slowly until the threaded portion of the
poppet shaft stands outside the poppet bearing (12).
10. Lay the arms of the lever (10) inside the groove of the
valve body (11), straddling the poppet shaft (14), so that the
curved portion of the lever faces away from the air outlet hole.