Replace the Regulator on a Pancake Air Compressor




Introduction: Replace the Regulator on a Pancake Air Compressor

I borrowed my father's compressor to finish some work on my deck.  As you can see in the picture, it's been around the block a couple of times.  After setting it up one day I could hear more air than usual escaping.  Turns out the regular had broken right where the air hose connected.  Duct tape from a previous attempt to stop an air leak was all that was holding the hose on the compressor.

Luckily, replacing the regulator is an easy job, and can be completed in less that half an hour.

Step 1: Materials and Tools


1/4 inch Mini Regulator - under $20.  Most hardware stores should have one of these in stock.
Teflon tape


Adjustable Wrench - for turning stuff
3/16 Allen wrench - for turning other stuff
Scrubbing pad - for scrubbing stuff

I didn't take a pic of the tools needed, I figure most folks know what we're dealing with here.

Step 2: Remove Old Regulator

With adjustable wrench in hand I set about removing the old regulator.  First I removed the duct tape hold on the air hose.  Judging from the amount of rust inside the break I'm guessing it's been cracked for a long time.

I placed the wrench around the body of the old regulator to get it off, as I couldn't turn it by hand.  As soon as I applied pressure the entire regulator fell to pieces.  After that everything came off easily.  You'll want to save the female quick connect to use on the new regulator, if it's still in good shape.  

I also saved the gauge.  The new regulator came with one, so now I have a spare for another project.  Sweet!

Step 3: Prepare for New Regulator Installation

I found the old fittings to be in decent shape, despite being a bit gunky, so I decided to reuse them.  Take your scouring pad and clean off as much grime as you can.  Not pictured, but also do this to the quick connect fitting you saved from the last step.

Then use the teflon tape on the threads.  Be sure to apply the tape in the direction of the threads, else the tape may come off as you thread on the new regulator.  Also, you'll want to avoid covering the end of the fitting.  Doing so will restrict air flow and lead to decreased performance.

Step 4: Install New Regulator

Nows the fun stuff.  There are four threaded holes on the new regulator.  Two are for the gauge and/or plug, the others for actual air flow.  It is easy to tell which is which.  Air flow holes are the big ones.  Of course there's a catch.  According to the instructions included with the regulator air flows in only one direction through the regulator.  This direction is indicated by an arrow on the regulator itself.  So I look and look for the arrow.  Do I find it?


So I guessed.  Looking into the regulator I could see some workings on one side, and just space on the other.  I figured the side with the workings should attach to the compressor, the other side to the hose.  Turns out I was right.  Yay!

Simply thread the regulator onto the fitting.  The power cable and a hose got in the way when I was threading the regulator on, but I was able to move everything enough to get by.  Just barely.  If your compressor is more compact you may have to remove additional pieces to be able to get the new regulator on.

Decide which side you want the gauge on and screw it in, after taping the threads.  Then install a plug on the opposite side.  Two plugs came with the regulator and they already have a sealant on them.  You will need the allen wrench to install the plug.  The instructions mention an included wrench, but I found none with mine.  

Lastly install the female quick connect you saved from the old regulator.  Now fire up the compressor and check for any leaks.  If you find none, hook up a gun and go to town.  You're done!.

Step 5: Troubleshooting and Conclusions


If you do hear a leak there are a few things you can do.  The first step is to find the source of the leak.  I've found the running my fingers over and around the fittings and ports is the easiest way to find leaks.  You won't be looking to feel a leak so much as listening for a change in pitch.  

When you find the leak try tightening, or re-installing the fitting.  If you try re-installing remember to replace the teflon tape.  Another option is to try another port.  For example, I found that the gauge included with the new regulator would not fit into one of the ports, so I had to swap it to the other.  This is why the finished pic shows the gauge in a different orientation than the assembly pic.

You can also try swapping out the fitting altogether.  I found that the female quick connect was shot to begin with.  Instead of replacing it my father simply tried duct taping it.  In this case replacing the fitting was the better option.

Lastly, you can choose to ignore it.  A small leak isn't that big a deal in my mind.  


This was really a very easy fix.  I went in thinking it would be much worse.  Of course, different models of compressors may present more or fewer hurdles.  It seems many newer pancake compressors have a good deal of plastic covering everything, so some radical surgery may be required to get to the important bits.

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    5 years ago

    My father is using a big model 60-Gallon Vertical Industrial air compressor for his motor garage. He is not sure how to replace the Regulator of this compressor. I read this full review and I can try to replace it with my father. It is so heavy and not any wheels to transport. When we need to take another place we both done very hard work.

    Quincy QT-54 Splash Lubricated Reciprocating 5 HP, 230 Volt, 1 Phase, 60-Gallon Vertical Industrial Air Compressor Reviews.jpg

    Between this post and the resourceful hardware store clerk at True Value I was able to fix my compressor. I had always been one of the duct tape fixers as well but that only lasts so long!

    Robot Lover
    Robot Lover

    11 years ago on Introduction

    pancake compressors are just to small for me! But they can be great if you are trying to save space.


    Reply 11 years ago on Introduction

    Well, pancake compressors are only really good for nailers. Using a larger compressor for that is impractical.

    Phil B
    Phil B

    Reply 11 years ago on Introduction

    Sometmes old how-to magazines, like Popular Mechanics and Popular Science have had articles on how to make an air compressor from an old lawnmower engine. I cannot tell you which issue of which magazine, but you might want to check an Instructable I did for information on searching these magazine archives. I would look in the editions of these magazines published in the 1950s and 1960s. You will also need an electric motor to turn the modified lawnmower engine. Check the prices of components you will need before you begin and you may simply want to buy a small or medium home air compressor to suit your needs.


    Reply 11 years ago on Introduction

    ok thanks soory about the mispelling have 3 computers on oldest one