Refrigeration Service Operations
146
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.
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.
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. Make sure you can feel the piston
working against the spring.
1.
Seal Groove in Piston
2.
Connecting Notch in Piston
3.
Internal Spring in Seal
4.
Connecting Groove in Stem
5.
Retaining Clip
Figure 228: Piston and Stem Parts
2
5
4
3
1
AGA1066
1.
Number 43 Drill
Figure 229: Check Bleed Hole Diameter
1.
Number 66 Drill
2.
Check for Burr Here
Figure 230: Check Piston Bleed Orifice
1
1
2
