Question about Air Tools & Compressors

2 Answers

Why is my mid 70's 2cylinder Worthington shop air compressor ( for powering pneumatic tools) suddenly leaking the compressed air out of the tank, back up through the air filter ?

After pressure builds up & it shuts off, I can hear air hissing from the intake which makes it come back right back on about three minutes after it shut off. What kind of valve keeps it in the tank after the motor puts it there?

Posted by on


2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert who has achieved Level 3.

  • Master
  • 401 Answers

Sounds like bad reed valves in head, some older units had a in line check valve, I know they can also be added

Posted on Jan 10, 2015

  • Level 1:

    An expert who has achieved level 1.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 8 Answers

You will probably have reed valves inside the head. One may be bent or broken or you may have simply blow a head gasket which is easy to fix. just google reed valves in a air compressor and you will see the setup.
You will need to take the head off which will be 6 or 8 bolts and have a look.Not hard If it is a gasket it will only cost you $30 or $40 for a kit.

Posted on May 26, 2014


6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

  • 104 Answers

SOURCE: coleman powermate inflationmate pump

The ring is gone on compressor. You can buy replacement pistons and rings from colemen. Comes with instructions.Good luck

Posted on Oct 26, 2008

  • 1388 Answers

SOURCE: Compressor is building up pressure very slow.

It could very well be the valve plate however before you order parts take a look at the cylinders. Unplug the unit, remove the cover from crank side and turn the compressor by hand till the/a piston is at top of stroke. Examine upper cylinder for scratches /wear or failed vinyl piston ring. On oil-free compressors, dirt and grit is sucked-in from the bottom of the cylinder and causes leaks between cylinder wall and piston. If scratched, air pressure is leaking down thru cylinder wall. Failed reed valves cause a pulsation at the intake port (air seems to be pumped out the intake). If you see a model number anywhere on the pump that begins with " WL", your pump is made by Campbell Hausfeld. Parts can be ordered from other-wise order parts from sears parts. Cylinder kits are around $40. Good Luck on the repair and email if you have questions.

Posted on Apr 02, 2009

  • 226 Answers

SOURCE: coleman powermate compressor doesnt hold air


Posted on May 23, 2009

  • 1 Answer

SOURCE: Was working normal suddenly will not build pressure

Maurader1 an apprentice has this problem solved and is spot on. All these gurus and wiz need to stick to the basic and common sense. The first place your pump will give out after use or abuse is the gasket. All this garbage about defective reeds and defective pressure switch is a lot of nonesense if you first don't rule out the most common problem the head gasket. I'm cheap and this thing has paid for itself 10 time over. You can get a gasket kit for $7, but I fabricated a gasket out of the back of my notebook and sprayed some gasket spray and been working like a charm ever since.

Posted on Jan 04, 2010

  • 59 Answers

SOURCE: IR SS5L5 Won't reach shut off pressure

It sounds as though your unloader valve is stuck or broken. I would try and repair it but otherwise you will have to bite the bullet and get a new switch assembly I think. As you have just been working on the tank it might just be a bit of debris dislodged and stuck in the unloader valve. The unloader should only hiss just after switch off weather by automatic shut off or by manual shut down.

Posted on Jun 06, 2010

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

4 Answers

I just bought a craftsman pneumatic 1/2-in drive impact wrench. And used it with my craftsman 4-gallon 1hp air compressor tried to loosen the bolts on my car wheel wouldn't loosen them help

Pneumatic tools are rated in cfm (cubic feet per minute). Your 1 HP air compressor is rated at probably not more than 3 cfm while the 1/2 " impact driver needs at least 8 cfm, maybe 12 chm of air.
The compressor must provide more chm than tool rating needs.
It is a problem, by the time you look at five horse power air compressors and larger, a lot of electric power is needed. A circuit of 220 volts, 20, 30, or more amps would be required to run those large expensive compressors.
If you can, return the air tool and get a good electric tool instead.
Leave those high air volume air tools to shops that are so equipped to use, or invest if you must.

Jul 24, 2017 | Craftsman Air Tools & Compressors

1 Answer

What should I do if my brand new Fasco pneumatic upholstery stapler is leaking air through the tail end...not the hose, but the two holes in the handle? Any suggestions?

Hi Anonymus,

What's happened if the driver blade has stopped in mid stroke, the air will escape. Quickest was 'round this is to take the airline off the tool, then find some scrap wood, place the tool on it as though you're firing it, and in THIS ORDER... pull the trigger and re-connect the airline at the same time. This usually sorts this out. Regardless of the tool make and model this will happen to most users sometime....
Leigh Co Limited

May 25, 2014 | Fasco Tools & Hardware - Others

1 Answer

I have a worthington tow behind compressor, and I have a ton of oil mixing in with the air, it makes a huge mess. I have replaced the filter, any other suggestions

you stated you replaced the filter.Was it the separator filter? the separator filter is located inside the separator tank. the separator tank is where you add oil. If this filter is bad it will cause oil and air to mix and get into the air. Also there is a 1/4 inch line that comes from the top of the tank . this line has an orffice in it If the orffice plugs oil can carry over into the air.

Sep 18, 2011 | Worthington Air Tools & Compressors

1 Answer

I have a Central Pneumatic, 21 Gallon, 3HP air compressor. The compressor is exiting air through exthaust port.

If air leaks when motor is off, fault most likely in-tank check valve. Follow discharge air line from pump to tank. Brass/steel valve at tank is the check valve. Remove hose to valve and check for leak. Replace as needed. If air is leaking while motor is running fault could be reed valves in head. Faulty reed valves in head, or torn head gaskets will cause very hot discharge air and tank will most likely never fill to shut off (or take a very long time to fill)

Sep 06, 2010 | Air Tools & Compressors

1 Answer

Central pneumatic. It will not compress to more than 20 pounds. Doesn't seem to leak.

Central Pneumatic is a Harbor Freight Tools brand, and they are usually pretty good about working with you if you need to do an exchange. Get ahold of your local Harbor Freight store or go to their website for more info.

Aug 18, 2010 | Air Tools & Compressors

1 Answer

Compressor will run but not produce air

Check your safety valve is closed by pulling it out and releasing it. You can use a mixture of dishwashing soap and water to drip on the valve to see if it makes bubbles identifying a leak. Next make sure the petcock valve on the bottom of the tank is closed and not leaking by using the soapy water again. If you cannot close or fix the valve replace it. The next trouble shooting will require checking the air input to the tank but be careful since the tubes could be hot.

Aug 18, 2010 | Chicago Pneumatic Qrs 5 HP/3 Phase Rotary...

3 Answers

Do I have to fill the tank with water if I am just using air for a pneumatic nail gun?

Water should NEVER go into an air compressor tank. It causes corrosion. Your goal is to REMOVE moisture before it goes into the air tool with a dryer.

Thanks for using FixYa - a Very Helpful rating is appreciated for answering your FREE question.

Jul 10, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

The nails are only coming half way out and sticking.

Hi again, Well we don't know what size or how you are using your compressor but if it receives a lot of use like in a big shop, investing in a dryer might not be a bad idea. The more you use one the more water as heat is generated by compressing the air and as in cools it condenses the water out. In the mean time most all compressor tanks have a valve at the bottom of the tank to drain the water out, open it slowly so that you get a good stream and when the water is gone it will start bleeding the air and you can close it. I think Idaho is right about the composition of the nails and sometimes the glue strip on the top that holds them all together can gum up the gun. Also between you and me I don't think there is such a thing as an oil less pneumatic tool. Put a couple of drops of pneumatic tool oil in the air inlet, if the gun doesn't need it, it will come out in the exhaust. but it will also force any moisture through the gun as well. Let me know how this works out for you and Thanks to Idaho as well.

Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

Mar 27, 2009 | Air Tools & Compressors

1 Answer

Compressed air tool Usage

Craftsmen often prefer a compressed air tool over an electric power tool for certain jobs. Drywall and trim work are both made easier and accomplished more quickly with pneumatic tools. The most commonly purchased compressed air tool duo for homeowners is the pneumatic drill and nail gun. If you are a homeowner shopping for compressed air tools, be sure you understand how different models work and how the power is supplied. Read the manufacturer’s directions for use and maintenance, and be sure to have the proper sized hoses, fittings, and air compressor.

Aug 27, 2008 | Campbell Manufacturing Campbell Hausfeld...

Not finding what you are looking for?
Air Tools & Compressors Logo

Related Topics:

67 people viewed this question

Ask a Question

Usually answered in minutes!

Top Air Tools & Compressors Experts

John Trevino

Level 3 Expert

1388 Answers

Joe Garcia
Joe Garcia

Level 2 Expert

205 Answers

Brad Brown

Level 3 Expert

17102 Answers

Are you an Air Tool and Compressor Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides