TK 56433-5-MM-EN
75
Figure 90.
Piston and Stem Parts
1.
Seal Groove in Piston
2.
Connecting Notch in Piston
3.
Internal Spring in Seal
4.
Connecting Groove in Stem
5.
Retaining Clip
End Cap Checks
All end caps, even new ones, should be checked as
follows. See Service Bulletin T&T 260 for more
information.
Check Valve Bleed Hole Diameter
1.
Remove the condenser pressure bypass check
valve snap ring, stem, spring, and piston from the
end cap.
2.
Use a number 43 (0.089 in. [2.26 mm]) drill bit to
check the size of the hole from the end cap gasket
face to the check valve piston bore as shown.
3.
If the drill does not go all the way into the bore, drill
the hole completely through.
4.
Deburr the hole in the check valve piston bore. A
used drill bit can be modified to use as a deburring
tool.
Figure 91.
Check Bleed Hole Diameter
1.
Number 43 Drill Bit
Piston Bleed Orifice Check
1.
Use a number 66 (0.033 in. [0.84 mm]) drill bit to
check the orifice in the bleed hole from the gasket
surface to the groove in the bottom of the piston
bore.
2.
Carefully check to see that the drill projects down
into the groove and that there are no burrs at the
end of the hole in the groove. Do not enlarge this
hole.
Figure 92.
Check Piston Bleed Orifice
1.
Number 66 Drill Bit
2.
Check for Burr Here
Check Valve Piston Check
1.
Reassemble the end cap using a new check valve
piston, spring, stem, and snap ring (Kit P/N 60-163).
2.
Leave the stem back seated against the snap ring.
Use a paper clip bent into a 90 degree angle to push
the check valve piston back in its bore. Verify you
can feel the piston working against the spring.
3.
With the piston pushed all the way back in its bore,
use a strong light to look down the 0.089 in. (2.26
mm) hole towards the back of the piston and
