2.
To secure the wear ring (164) locate, drill, and tap three new setscrew holes equally spaced be-
tween the original holes in each new wear ring and wear ring seat area. Install setscrews (222E)
and upset threads.
3.
Confirm the bore diameter of the wear ring (164) after installation.
4.
Check the wear-ring (164) runout and distortion by measuring the bore at each setscrew location
with inside micrometers or vernier calipers. Machine any distortion in excess of 0.08 mm |0.003 in.
6.5.5.1.3 Replace the seal chamber wear ring and throat bushing
1.
Chill a new seal-chamber-cover wear ring (230) and throat bushing (125), using dry ice or another
suitable chilling substance, Install the wear ring into the cover fit and the throat bushing into the seal
chamber fit. Be prepared to tap the wear ring and throat bushing in place with a hardwood block or
soft faced hammer.
2.
To secure the wear ring (230) locate, drill, and tap three new setscrew holes equally spaced be-
tween the original holes in each new wear ring and wear ring seat area. Install setscrews (222E)
and upset threads.
3.
To secure the throat bushing (125) locate, drill, and tap three new setscrew holes equally spaced
between the original holes in each new throat bushing and seal chamber seat area. Install set-
screws (222D) and upset threads.
4.
Confirm the bore diameter of the wear ring (230) after installation.
5.
Check the wear-ring (230) runout and distortion by measuring the bore at each setscrew location
with inside micrometers or vernier calipers. Machine any distortion in excess of 0.08 mm |0.003 in.
222D
222E
125
230
184
184
125
222D
Figure 60: Seal chamber cover wear ring and throat bushing
6.5 Preassembly inspections
Model 3700i API610 / Type OH2 Installation, Operation, and Maintenance Manual
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