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I have a mastercraft compressor with LCD display its 11 gallon,it runs up to about 70 psi and will not go higher but keeps running, any ideas.


You either have an air leak somewhere or you have a damaged valve in the valve body. You can check for leaks using a spray bottle with a dishwashing detergent/water mix. Spray the mixture on connectors and look for bubbles. Don't forget to check the tubing coming from the compressor head and the regulator. If you find no leaks (you need to check carefully), you might need to remove the compressor head and check to see if the valves in the valve body are damaged. My Campbell-Hausfeld compressor did the same thing and I had to replace the valve body.

Mar 08, 2017 | Psi Air Tools & Compressors

1 Answer

My compressor is not buildngup air pessure


Most compressors that come into the shop are not reaching cut off pressure. Here are a few tips on determining the problem /s. Three problem areas. Leaks,valves/head gaskets or worn cylinder/rings. Leaks on small compressors are easy to find by spraying soapy water on all connections and drain valves. Also spray on head gaskets. Repair as needed. No joy? Continue with checking valves. Most small compressors have reeds for valves and fail quite easily. There should be good suction at intake opening. Run compressor till no more gain in pressure. With air filter removed and pump running feel for suction at intake. If you feel very little suction or air blowing out of intake , most likely bad reeds or gaskets. If you feel good suction however no gain in pressure then likely worn cylinder. Good luck with repair.

Feb 03, 2017 | Air Tools & Compressors

2 Answers

I have a a old Gibralco compressor when i cut it on it starts fine when it reaches desired pressure it stops and restarts until i kicks the breaker what can i try


i suspect that the start/run capacitor is faulty or the centrifugal switch in the back of the motor is faulty

have an accredited electrician check the motor , capacitor and the pressure control switch
the air leak at the head is a faulty non return valve in the compressor line to the tank
available at good tool shops for around $60.00

Sep 07, 2015 | Air Tools & Compressors

1 Answer

What causes air compressor to continue leaking air


A hose connection, such as a hose end coupler for
your tools,etc They get rusty inside & only last about a year

Next would be any threaded connection,mostly hose & regulator or filter related

Then you have the air tank check valve leaking or the drain valve
on bottom of the tank

Jul 14, 2014 | Ingersoll Rand 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 ?


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.

May 11, 2014 | Air Tools & Compressors

1 Answer

Compressors kicks breaker at 60 psi.


This is usually caused by long extension cord, leaking check valve or weak capacitor. Most likely leaking check valve. Easy to check, run compressor for a couple of minutes and shut off. Listen for air leaking from pressure switch or at the intake filter. If leaking, let out air and remove check valve and look for debris stuck under the valve seat. To find the checkvalve, follow the air discharge tube from the head of the compressor to the tank. You should find a brass or chrome valve threaded into the tank. If check valve is not leaking, suspect weak capacitor or long cord (motor shop will test cap for free). Good luck

Apr 02, 2013 | Craftsman Air Tools & Compressors

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2000 mercury grand marquis, rear air suspension deflated. Compressor not come on now. At first it would leak some overnight, sometimes all the way down. but on starting engine it would comke up to full...


Hello, There are several things to check. Use some old fashion soapy water and a spray bottle and after you have some air in the system, spray for leaks. The soapy water will bubble if you find the leak. Do the bags, the sensors on the bags, and the lines and follow them up to the front of the car.

There should be a Master vent valve which is usually tucked into the Drivers side of the front lower fender or lower Radiator support. Just follow the air lines to it. When they start failing, it is usually corroded up.

A repair shop would need a Diagnostic tool to fit the special test tap for the system. If it is an electrical part, the tool would find it. But for a physical hole in a part, the soapy water is what you would use.

Jun 19, 2011 | 2000 Mercury Grand Marquis

1 Answer

Sears Craftsman 919.167312 Leaking Air


http://www.searspartsdirect.com/model-number/919167312/0247/0703000.html Model 919167312 CRAFTSMAN AIR COMPRESSOR Parts . It is part 24 or 24a. The female threaded fitting is part of tank. Take the drain valve to a machine shop and have them tell what is the size and tpi. Have the chase the tank female fitting. I f don't want to that once you diameter and tpi you can buy a tape and chase it yourself. Word of warning if you start the tap crooked you will cut new threads and the tank is worthless. I wouuld pay the machine shop and be satisfied.

May 28, 2017 | Air Tools & Compressors

1 Answer

Wanting to replace air compressor on 1999 durango.


Air compressors very seldom become defective. However, if you wish to tackle the job make sure the freon is removed from the unit by loosening the high pressure valve. I would suggest you take it to a shop and have it repaired. Purchase what ever you need from the internet. Purchased all the parts to redo my 1966 mercury from Ebay, saved $400 hired expert to do the job for $200. Tools for replacing are expensive you would come out better by having it done. May be a small problem, such as the dryer, or low freon, or a leak Most shops will diagnosis the problem for free or a small charge. Or you could check the unit by adding a leak detector using the low side of the air condition unit. The low side is the lareer of th two lines in the unit.

Jun 08, 2009 | 1999 Dodge Durango

1 Answer

Oil on sprark plugs


  1. Disconnect the negative battery terminal.
  2. Remove the valve cover, using the proper procedures.
  3. Remove the camshaft, shims and rockers, if equipped, using the proper procedures.
  4. Remove the spark plugs.
  5. Rotate the engine to Top Dead Center (TDC) for each cylinder's seals that are being replaced; e.g., if replacing the No. 2 cylinder valve seals, have the No. 2 cylinder at TDC. Use a coat hanger put down into the cylinder to determine when it is at TDC.
  6. Attach a fixture at the flywheel or the front of the engine to prevent the engine from rotating. Make sure the fixture damages no components.
  7. Thread an adapter into the spark plug holes that can be hooked up to a shop compressor air hose.
  8. Apply 90 psi of shop compressor air to the adapter hose. This is done to keep the valves from dropping down into the cylinder when the valve springs are removed.
CAUTIONTo avoid personal injury, wear eye and ear protection. Keep hands and clothing away from engine parts that rotate, in case the engine does rotate from the cylinder air pressure.
  1. With the cylinder under pressure, remove the valve spring retainer and the spring, using a spring compressor tool. Hitting the spring retainer with a soft hammer may help loosen the valve keepers, if the keeper will not move downward when trying to compress the spring.
  2. With the valve spring removed, remove the oil seal.
To Install:
  1. Install a new seal, using Toyota Special Service Tool (SST) 09201-41020, or equivalent.
  2. Reinstall the valve springs (See Valves).
  3. Release the air pressure and reverse the removal procedures to complete installation.
  4. Connect the negative battery terminal, start the engine and check for leaks.
0900c15280046373.jpgFig. 1 Removing the valve sealsCelica 0900c15280046378.jpgFig. 2 Intake and exhaust valve sealsCelica 0900c15280046379.jpgFig. 3 Installing the valve sealsCelicaWith Cylinder Head Off Engine
  1. Disconnect the negative battery terminal.
  2. Remove the cylinder head, using the proper procedures.
  3. Remove the valve and spring (See Valves).
  4. Remove the oil seal.
To Install:
  1. Install a new seal, using Toyota Special Service Tool (SST) 09201-41020, or equivalent.
  2. Reinstall the removed components to complete installation.
  3. Connect the negative battery terminal, start the engine and check for leaks.

Aug 25, 2008 | 1990 Toyota Celica

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