Carrier 07E - Manual (Page 15)

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RINGS
1. Check ring gap* by inserting each ring separately
in cylinder approximately 3/8 in. from top. Ring
gap should be between .002 in. and .007 in.
2. Install compression ring in top piston groove
with side marked “Top” toward piston head.
Install oil ring below compression ring with
notched end on bottom. Stagger ring gaps
around piston.
3. Measure side clearance between ring and piston
(Table 5). Check rings for free action.
Install connecting rod and piston assemblies
into cylinders. Place chamfered sides of connecting
rods against radius of the crankpins. Install
connecting rod caps to matchmg connecting rods
thru bottom cover plate. Be sure chamfered sides
of caps are against radius of crankpins. Caps are
locked in place with nylock cap screws. Use 8-10
ft-lb torque to tighten cap screws.
Turn crankshaft to be sure there is no binding
between bearing surfaces and journals. Replace oil
screen, bottom cover plate, valve plates and
cylinder heads.
MOTOR BURNOUT
(Clean-Up Procedure)
When a hermetic motor burns out, the stator
winding decomposes forming carbon, water and
acid which contaminate refrigerant systems.
Remove these contaminates from system to
prevent repeat motor failures.
1. Close compressor suction and discharge service
valves, and bleed refrigerant from compressor.
Save remaining refrigerant in system.
2. Remove burned motor from compressor, and
drain compressor oil. Clean crankcase and
motor housing with solvent. Ensure that all
metal particles are wire-brushed free and
removed.
On severe burnouts, disassemble compressor
heads and valve plate assemblies. Clean them in
same manner as crankcase and motor housing.
3. Ascertain cause of burnout and remedy. Check
control box for welded starter contacts, welded
overload contacts or burned out heater
elements. Check terminal plate for burned or
damaged terminals, insulation, and shorted or
grounded terminals.
Reassemble compressor with new stator and
rotor. Install new hquid line filter-drier, and
place new oil charge in crankcase.
Evacuate and dehydrate compressor.
Place compressor in operation. After 2-4 hours
of operation, check compressor oil for discolor­
ation and/or acidity. If oil shows signs of
contamination, replace oil charge, filter-driers,
and clean suction strainer with solvent.
7. Check oil daily for discoloration and acidity. If
oil stays clean and acid-free, the system is clean.
If oil shows signs of contamination, change oil,
filter-drier, and clean suction strainer. If fUter-
drier or suction strainer is dirty or discolored,
repeat this step until system is clean.
4.
5.
6
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