Carrier 07E specifications Compressor Running Gear Replacement, Wear Limits 06E Compressor

Page 15

CRANKSHAFT

CONNECTING

RODS AND

CAPS

OIL DRAIN PLUG (MAGNETIC)

BOTTOM

COVER

PLATE

OIL FILTER

SCREEN

Fig. 17 — View with Bottom Cover Plate Removed

CRANKSHAFT — Remove pump end bearing head and rotor. If connecting rod and piston assemblies are still in place. remove connecting rod caps and push piston assembly up into cylinder for crankshaft clearance. Pull crankshaft out through pump end opening. Inspect crankshaft journals for wear and tolerances shown in Table 7. Check oil passages and clean if clogged.

PUMP END MAIN BEARING — This bearing is a machined part of the oil pump and bearing head casting. Disassemble bearing head. If bearing is scored or worn, replace the complete bearing head.

CRANKCASE AND MOTOR END MAIN BEAR- INGS — These bearings are not field replaceable. If bearings are worn or damaged, replace compressor.

Table 7 — Wear Limits — 06E Compressor

 

 

FACTORY TOL.

MAXIMUM

COMPRESSOR PART

(in.)

ALLOWABLE

 

 

Max

Min

WEAR* (in.)

MOTOR END

 

 

 

 

Main Bearing Diameter

1.8760

0.001*

Journal Diameter

 

1.8725

 

 

PUMP END

 

 

 

 

Main Bearing Diameter

1.6260

0.001*

Journal Diameter

 

1.6233

 

 

CONNECTING ROD

 

 

 

 

Bearing Diameter

 

1.7515

 

(After Assembly)

 

 

0.002*

Crankpin Diameter

1.7483

 

THRUSTWASHER

 

0.155

(Thickness)

 

 

 

 

 

CYLINDERS

 

 

 

 

Bore

 

2.6885

0.002

Piston Diameter

 

2.6817

0.002

Wrist Pin Diameter

0.8748

0.001

Con. Rod Wrist Pin ID

0.8755

0.001

Piston Ring End Gap

0.007

0.002

0.015

Piston Ring Side Clearance

0.003

0.001

0.002

VALVE

Suction

0.0315

0.0305

0.002

THICKNESS

 

 

 

 

0.0255

0.0245

 

 

 

 

Discharge

0.0225

0.0215

0.002

END CLEARANCE

 

0.031

0.010

*Maximum allowable wear above maximum or below minimum factory tolerances shown. For example: difference between main bearing diam- eter and journal diameter is .0035 in. (1.8760 – 1.8725) per factory tol- erances. Maximum allowable difference is .0045 in. (.0035 + .001).

Compressor Running Gear Replacement

CRANKSHAFT — Be sure compressor end bearing washer is in place on dowel pin. Install crankshaft through pump end, carefully guiding it through main bearings. Replace rotor.

CONNECTING ROD/PISTON ASSEMBLY (Fig. 18) — The assembly of the connecting rod with contoured-crown piston must be as shown. Note the relationship of the piston crown pattern with the chamfered side of the rod bearing. This ensures that the rods in the outer positions on crankpins have the chamfers toward crankpin fillets. On 6-cylinder compressors, the position of the chamfer of center rod on crankpin has no significance.

Lock the piston pin in place with retaining rings as shown in Fig. 18.

The retaining rings should be tight enough that they cannot be rotated by finger pressure.

Rings

1.Check ring gap by inserting each ring separately in cylin- der approximately 3/8 in. from top. Ring gap should be between 0.002 in. and 0.007 inch.

2.Install compression ring in top piston groove with either side up (no difference). Install oil ring below compression ring with notched end on bottom. Stagger ring gaps 180 degrees.

3.Measure side clearance between ring and piston (Table 6). Check rings for free action.

Installation of Connecting Rod/Piston Assembly — Insert the connecting rod/piston assemblies into cylinders with pistons positioned as shown in Fig. 18 and 19.

This is necessary so that the suction valve and backer lie properly over the contoured piston crown.

Be sure that the outer rod on each crankpin has the chamfered side toward the crankpin fillet (this is a double check on the connecting rod/piston assembly).

Install caps to matching connecting rods with chamfered sides aligned. Caps are secured with Nylock cap screws. Tighten with 8 to 10 lb-ft torque.

TOWARD SUCTION VALVE

DOWELS IN CYLINDER DECK

RETAINING RING GROOVE (BOTH SIDES)

POSITION RETAINING

RING GAP APPROXIMATELY ON THIS CENTERLINE

CHAMFER MUST

BE ON THIS SIDE

Fig. 18 — Connecting Rod/Piston Assembly

15

Image 15
Contents Contents Safety ConsiderationsInstallation Electrical Connections B033 Unit 07E VoltsA022 B02706E Hermetic Compressor Units Electrical Data Compressor Motor With Circuit Breaker AUX DTSLLS Refrigerant PRE-START-UP06E Physical Data Unit 06ESTART-UP 07E Physical DataUnit 07E Capacity Control System ServiceFactory Switch Settings Protection DevicesContr Removing, Inspecting and Replacing Components FigCapacity Control NO.Suction Cutoff Unloader Operation Compressor Components 06E Shown Torque Values Lubrication SystemCompressor Running Gear Removal Suction and Discharge Valve Plate AssemblyWear Limits 06E Compressor Compressor Running Gear ReplacementMotor Removal Motor ReplacementMotor Alignment Forced Circulation Page Copyright 2002 Carrier Corporation