Speedaire Air Compressor Tank Leak

by Denise Brown

There is an air leak in the compressor where the motor mount is welded to the tank.


We have a frame shop and have all pneumatic tools. It's not good for the compressor to continuously cycle, obviously.

Before we have to dismantle the motor from the tank to have it re-welded we have been trying various glues, epoxies etc to plug the hole.

JB Weld was suppose to work, but it didn't. We have a lot of epoxy putty on it now, but the air still sneaks out.

We are next going to epoxy a metal plate over the hole figuring it can hold down the plate to cover the leak as opposed to patching the hole and the pressure forces a hole again.

Any thoughts?
Thanks,
Denise Brown

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Bill says...

Hi Denise. Two thoughts, actually.

Glueing a metal plate over a hole in a pressure vessel is a bad idea. You are creating a projectile that may hurt someone when the glue lets go, and it will.

Second thought, how much time have you folks spent so far, multiplied by your hourly rate, to try and fix the problem yourselves, versus the cost of buying a new tank, and replacing the leaking one? Which has / will cost you more?

It were my compressor, the leaking tank would already be gone.

Cheers,

Bill

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Find t small 1/4" bottom draincock for Speedaire tank

by Cal. Lafluer
(Phx.Az)

Hello! I have an older model 3Z394 speedaire compressor,and I have trying to locate the small 1/4"(short) drain cock, at the bottom of the tank. The ones that I have found are a little to long for the adaptation. Any suggestions where I can get the correct one. In the illustrations for Speedaire, this drain cock is either # 7 or #34. Thanks
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I don't have the manual so I don't recognize the details of the part.

You could install a small fitting, then run a tube to a small ball valve to be the tank drain.

Also, I believe there are some drain cocks listed under the Tank category in the compressors and compressor parts store I added near the top of the left and right columns.

Bill

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Suitable pressure switch for Speedaire 3Z355J

by Todd
(Longmont, Colorado)

Speedaire 3Z355J

Speedaire 3Z355J

Speedaire 3Z355J
Speedaire 3Z355J
Speedaire 3Z355J

Bill,
I have attached some pictures of the part that needs replaced on my air compressor.The picture with cover off shows the switch at the top (X*215, upside down). The actual switch that you flip no longer works. It is stuck in the on position. Is there a suitable replacement for this unit? Thanks
Todd
Sorry for the delay with the response.
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Hi Todd...

That looks like and oldie and a goodie air compressor.

Here is how I would approach this if it were my compressor.

The line from the tank enters the pressure switch and the pressure switch "reads" the pressure in the tank, ready to turn the compressor motor off when the pressure reaches cut out, and turn the compressor on when the pressure reaches cut in.

The ON/OFF switch allows the compressor user to turn the power off to the pressure switch, presumably to ensure that the compressor will not auto-cycle in the user's absence, if there is a leak in a fitting or line.

You can accomplish the same thing by pulling the plug from the socket. If the air in the tank falls below cut in with the plug pulled, the compressor will not start until the plug is, once again, inserted into the socket. That as soon as the plug is inserted your air compressor might start, might give you, too, a bit of a start, but then, the same on sequence occurs when you hit the ON switch. So... why do you need an on off switch.

What I would do is select any switch with the same voltage, the same pressure settings (close counts) and one that interfaces with the unloader valve. I cannot see how your current switch does that, but it may be on the obverse of the photo.

A pressure switch is a pressure switch. Your air compressor won't care what switch it is as long as the power gets to the motor when the pressure in the tank reaches cut in, and the power shuts off when the pressure reaches cut out and ... that the unloader valve opens on cut out.

Cheers,

Bill

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