Ariel Heavy Duty Balanced Opposed Compressor JGP/1

Warning: This maintenance check requires trained personnel with PPE!

VVCP packing assembly spring depressed and snap ring removed?

VVCP packing replaced due to excessive leakage?

VVCP piston ring removed and replaced as necessary?

All parts cleaned to remove debris, rust, etc.?

VVCP packing replaced and relaxed between two flat surfaces?

VVCP reassembled in reverse order?

New O-ring installed at the bolt flange?

Warning: This procedure requires trained personnel with PPE!

CAUTION: DO NOT TOUCH COLD SURFACES WITHOUT PROPER INSULATION TO PREVENT INJURY. ALCOHOL IS FLAMMABLE AND SHOULD ONLY BE USED IN OPEN AIR OR A WELL VENTILATED BUILDING. AVOID SPARKS AND OPEN FLAME. AVOID ALCOHOL VAPORS WHICH MAY CAUSE INJURY TO THE TISSUES OF THE NOSE AND EYES.

AVOID EYE AND SKIN CONTACT. USE NEOPRENE OR BUTYL GLOVES, MONO-GOGGLES OR FACE-MASK AND IMPERMEABLE APRON. IT CONTAINS METHYL ALCOHOL AND IS POISONOUS IF INGESTED. SEE MANUFACTURER'S MATERIAL SAFETY DATA SHEETS FOR MORE INFORMATION. DO NOT RETURN SOLUTION TO A CLOSED CONTAINER UNTIL IT HAS REACHED ROOM TEMPERATURE OR THE CONTAINER MAY EXPLODE.

NOTE: ABSOLUTE CLEANLINESS IS REQUIRED. ASSEMBLY MUST BE IMMEDIATE SO THAT THE BEARING DOES NOT WARM-UP AND STICK BEFORE IT IS IN PLACE. DO NOT SEAT A STUCK BUSHING WITH A PRESS OR HAMMER.

Main Bearings - Removal and Installation w/Crankshaft In Place:

NOTE: REPLACE ONE MAIN BEARING AT A TIME. REMOVE THE CAP ON THE BEARING BRING CHANGED, CHANGE THAT BEARING AND REPLACE THE CAP AND TIGHTEN THE BOLTING PRIOR TO STARTING THE NEXT BEARING.

Follow instructions in 'CAUTION' on Page 5-2. Remove coupling spacer or otherwise lockout.

Remove the cap screws from main (journal) bearing cap #1. Pull the cap straight up to prevent damage to the dowel fit. If the cap is tight, use a Bearing Cap Puller as illustrated in Figure 5-13 on Page 5-17.

CAUTION!: BE SURE THAT ALL PRESSURE IS RELIEVED FROM THE COMPRESSOR CYLINDERS PRIOR TO REMOVING PACKING.

Packing diaphragm and oil wiper packing removed

All tubing connections from the top of the packing flange and the primary vent tube from the bottom of the flange disconnected

Twelve point cap screws that hold the pressure packing flange to the cylinder removed

At this point do not remove the small nuts from the studs. These studs hold the entire packing case together so it can be removed as an assembly.

Pressure packing removed into the crosshead guide

Remove the top cover from the crankcase (connecting rod and chain access covers on the JGI) and the side covers from the crosshead guides.

Remove the piston and piston rod as described in “Piston and Rod” on page 5-27.

Move the throw to near the outer dead center position.

Remove the crosshead as described in “Crosshead - Removal” on page 5-11, while supporting the connection rod so that it does not drop.

Turn the crankshaft until the throw is near to its highest point position. Completely loosen the connecting-rod-cap bolting and remove the top two capscrews.

Separate the rod cap from the rod. Use the bottom two rodcap capscrews as a handles to pull on the bottom of the rod cap while tapping the top face of the rod cap with a semi-soft faced hammer. Do not pull or strike the rod cap too hard; it may break the rod cap dowels. Work the rod cap away from rod as evenly as possible. Separating the two parts unevenly may break the rod cap dowels or cause them to bind in the rod dowel holes. See Figure above.

Remove the rod cap and its bearing half shell.

The bearing shell may fall out when separating the connecting rod and cap from the crankshaft pin. If bearing shells do not come loose, rotate/slide them out of the connecting rod and/or cap.

Turn the crankshaft throw to near the inner dead center position and remove the rod through the crosshead guide opening (or connecting rod access hole on the JGI).

Check main, connecting rod, and crankshaft-thrust bearing clearances with a pry bar and dial indicator.

Check crosshead guide clearance with feelers.

Inspect valves for broken plates and loose center bolts.

Inspect cylinder bores for damage or wear.

Inspect piston rods for damage and excessive wear.

Rebuild cylinder packing cases.

Check and re-calibrate all temperature and pressure gauges.

Check and record compressor rod run out.