Corken 691 User Manual

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Model 491-107

Installation, Operation

& Maintenance Manual

Plain Style Compressors for Liquid

Transfer-Vapor Recovery

Solutions beyond products...

ORIGINAL INSTRUCTIONS IE101K

Warning: (1) Periodic inspection and maintenance of Corken products is essential. (2) Inspection, maintenance and installation of

Corken products must be made only by experienced, trained and qualified personnel. (3) Maintenance, use and installation of Corken

products must comply with Corken instructions, applicable laws and safety standards. (4) Transfer of toxic, dangerous, flammable or

explosive substances using Corken products is at user’s risk and equipment should be operated only by qualified personnel according

to applicable laws and safety standards.

Table of Contents

Questions and Answers:

A
Amy SantosAug 17, 2025
Why is the capacity of my Corken 691 Air Compressor so low?
- S
  Stephanie HobbsAug 17, 2025
  If your Corken Air Compressor has low capacity, several issues could be the cause. The valves might be broken, stuck, or leaking, in which case you should inspect and clean or repair them. A worn piston ring could also be the culprit, so inspect and replace it if necessary. Additionally, a clogged inlet strainer can restrict flow, so clean or replace the screen. Leaks in the piping can also reduce capacity; inspect and repair any leaks. Finally, ensure the 4-way control valve is lubricated by inspecting and lubricating it.
A
andrewgonzalezAug 19, 2025
Why is my Corken Air Compressor overheating?
- T
  Tyler MartinAug 19, 2025
  If your Corken Air Compressor is overheating, several factors could be responsible. Start by checking the valves for any signs of damage, sticking, or leaks; inspect, clean, or repair them as needed. A worn piston ring can also cause overheating, so inspect and replace if necessary. A clogged inlet strainer can also lead to this issue, thus clean or replace the screen as necessary. Ensure that the cooling fins are clean, and clean them weekly. For issues such as high inlet or ambient temperature, high compression ratio, or an unbalanced load, it is recommended to consult the factory.
T
Tony WilliamsAug 22, 2025
What to do if my Corken 691 Air Compressor has product leakage?
- Q
  qmartinAug 22, 2025
  If you're experiencing product leakage from your Corken Air Compressor, there are a few potential causes. Check for leaks in the piping and repair them as needed. A worn piston-rod packing can also cause leakage, so replace it. Loose valves, pistons, or packing can also be responsible; tighten or replace them as necessary. Additionally, a 4-way control valve that is not lubricated can lead to leakage; inspect and lubricate it.
J
Johnathan Griffith MDAug 25, 2025
How to fix knocks, rattles, and noise in my Corken 691 Air Compressor?
- S
  Scott LopezAug 26, 2025
  Excessive noise in your Corken Air Compressor can stem from several sources. Valves that are broken, stuck, or leaking are a common cause; inspect, clean, or repair them. A loose flywheel or belt can also generate noise, so tighten them. If the wrist pin or wrist-pin bushing is worn, replace it. Similarly, a worn connecting-rod bearing should be replaced. An unbalanced load may also lead to noise, in this case inspect the valve or consult the factory.
C
Carol SimpsonAug 28, 2025
How to reduce excessive vibration in my Corken 691?
- A
  Ann JacksonAug 28, 2025
  Excessive vibration in your Corken Air Compressor may be due to several reasons. Broken, stuck, or leaking valves can cause vibration, so inspect, clean, or repair them. A loose flywheel or belt can also lead to vibration, so ensure these are tightened. Worn wrist pins or wrist-pin bushings and worn connecting-rod bearings can also cause vibration and should be replaced. An unbalanced load may also be the cause, in this case inspect the valve or consult the factory. Inadequate compressor base can cause excessive vibration, so you should strengthen, replace, or grout it.
D
Devin ThompsonAug 30, 2025
What causes abnormal piston-ring wear in a Corken Air Compressor?
- K
  Kristina RamosAug 31, 2025
  Abnormal piston-ring wear in your Corken Air Compressor can be attributed to several factors. Valves that are broken, stuck, or leaking can cause this issue, so inspect, clean, or repair them. A worn piston ring itself can also lead to abnormal wear, so inspect and replace it if necessary. Loose valves, pistons, or packing can contribute to this problem; tighten or replace them as needed. Dirty cooling fins can also cause abnormal wear, so clean them weekly. For issues such as high inlet or ambient temperature, high compression ratio, or an unbalanced load, it is recommended to consult the factory.
L
Luis PriceSep 2, 2025
Why is there oil in the cylinder of my Corken 691?
- M
  Megan RobertsSep 2, 2025
  If you find oil in the cylinder of your Corken Air Compressor, it could be due to a worn piston-rod packing, which should be replaced. Alternatively, the valve, piston, or packing might be loose; tighten or replace these components as necessary.
W
wstricklandSep 8, 2025
Why is product leaking through the crankcase breather of my Corken Air Compressor?
- J
  jhallSep 8, 2025
  If product is leaking through the crankcase breather of your Corken Air Compressor, it may be caused by a worn piston-rod packing, which requires replacement. Another potential cause is a loose valve, piston, or packing, which should be tightened or replaced as necessary.
D
dmcphersonSep 12, 2025
What causes oil leakage around the base of my Corken 691 Air Compressor?
- M
  mcardenasSep 12, 2025
  If you notice oil leakage around the base of your Corken Air Compressor, it could be due to leaking gas blowing oil from the crankcase, in which case you should tighten the packing. Another possibility is a bad oil seal, which would need to be replaced.
Z
zparksSep 13, 2025
What to do if my Corken 691 Air Compressor has no oil pressure?
- E
  Ellen FriedmanSep 13, 2025
  If your Corken Air Compressor has no oil pressure, it could be due to a lack of oil in the crankcase, in which case you should add oil. Alternatively, there may be an oil-pump malfunction, in which case you should see oil-pressure adjustment.

Corken 691 Specifications

General

Brand	Corken
Model	691
Category	Air Compressor
Language	English

Summary

General Warning

Chapter 1: Introduction

1.1 Liquid Transfer By Vapor Differential Pressure

Explains transferring liquefied gases using pressure differential for liquid transfer.

1.2 Residual Vapor Recovery

Describes the process of recovering residual vapors from a tank for economic value.

Chapter 2: Installing Your Corken Compressor

2.4 Liquid Traps

Details importance and types of liquid traps to prevent compressor damage.

Chapter 3: Starting Up Your Corken Compressor

3.4 Startup Check List

Provides a comprehensive list of pre- and post-startup checks.

Chapter 4: Routine Maintenance Chart

Chapter 5: Routine Service and Repair Procedures

5.1 Valves

Covers inspection, cleaning, and replacement of compressor valves.

5.3 Piston Rings and Piston Ring Expanders

Details the procedure for replacing piston rings and expanders.

5.4 Pistons

Provides steps for replacing pistons, including shimming and clearance checks.

5.6 Cylinder and Packing Replacement

Covers cylinder maintenance and replacement due to corrosion or damage.

5.7 Bearing Replacement for Crankcase and Connecting Rod

Outlines procedures for replacing various bearings in the compressor.

Appendix A: Model Number Identification Code and Available Options

Appendix B: Specifications

Specifications for Vertical Single-Acting Models 91-691

Lists equipment types, features, benefits, and operating data for single-acting models.

Specifications for Vertical Double-Acting Model D891/FD891

Lists equipment types, features, benefits, and operating data for double-acting models.

Appendix C: Compressor Selection

Appendix E: Parts Details

Parts for 91 and F91 Head and Valve Assembly

Parts for 691 and F691 Piston Assembly

Parts for D891 and FD891 Crankcase Assembly

Appendix F: Troubleshooting

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