Reed position on a Sears model 921.166400

by Cliff Zee
(Westbury,NY)

Tank fills to about 30 psi and doesn't hold. Seems air is coming out of oil vent cap.


I removed cylinder head to examine piston rings(which look fine) and noticed a reed out of position.

I would like to know the correct position of this reed .

The other reed has a groove where you know its sits in. The second reed has no aligning groove. Does the reed with no positioning groove sit in the middle of the valve plate opening covering that "open slot"in valve plate?

Also do cylinder head allen screws get any lock tight? Thank you

Cliff NY
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Cliff, the manual for the Sears 921.166400 will be uploaded in a short while on the Sears compressors page.

I don't think that a misaligned reed would be responsible for air coming out the oil fill cap. That's usually reserved for air blowing by the piston seals, so I suspect that even though they look good, there may be a problem there.

I do not know the answer to your reeds question, so I hope another reader has encountered this and will post to help.

Your air compressor is still supported by Sears so you might want to contact them as well.

Cheers,

Bill

Comments for Reed position on a Sears model 921.166400

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Jan 14, 2013
response
by: cliff

Bill,
Stupid me didnt see on the other side of the valve plate had another groove where the second reed sits. The reed fell out when i removed cylinder head from underside of valve plate. Reed position question resolved.
Also--I found the part of the head gasket that splits the cylinder down the middle was blown. so the circumference of gasket was intact, the middle divider portion blown. Made a new gasket---compressor works like a charm!!! Thanks !!!
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Cliff, you are most welcome. Other visitors with the same problem will benefit from your post.

Bill

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Picture - ongoing slow pressure build in Sears compressor

by Terry
(Travis Bridge, Al)


Bill, I have attached a pic of the backside of my unit that I omitted earlier. Hope it helps and as always, thanks for your help.
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Terry, I have added this photo to the original post.

I can see why you are confused about oil vent caps etc., as based on the photos, it appears as though your pump is oil free, unless there is a lubrication source that isn't visible.

Terry, if your compressor pump is running when the motor does, if the intake valve is pulling air in, if the high pressure port is pushing air out and down into the tank, if your electric motor isn't bogging down (slowing) as the back pressure in the tank increases, then the only other thing I can think of is that the piston seals are allowing bypass.

I know you've torn it down and didn't see any issues inside the pump, yet, you've fixed the valves, fixed the gaskets (assuming that one doesn't leak when pressure builds and you cannot see the hole when it isn't under pressure) so the only other thing it can be is a piston seal, as far as I can see.

Good luck.

Bill

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226.165290 compressor... Motor buzzes and switch sparks.?

by Art
(New Milford Ct.)

Sears air compressor model 226.165290... Motor buzzes... Sparks from switch.. Kicks off breaker... Will not start.... About 5 years old... Low hours...
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Art, if the switch that is sparking is the pressure switch that turns the compressor motor on and off, to me the symptoms suggest that the points in the pressure switch are burnt or worn to the point where they cannot make good contact and are jumping or chattering.

Pull the cover of the pressure switch, empty the tank, then start the compressor, being very careful as there are now live wires exposed.

Watch the contact area in the switch. What are you seeing? Let me know as a comment here, please.

Bill

Comments for 226.165290 compressor... Motor buzzes and switch sparks.?

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Dec 03, 2012
Switch
by: Art

Guess your right the capacitor didn't work... checked again.. Sparks coming off the switch when I turn it off... time for a new compressor...lol

Dec 03, 2012
Switch
by: Art

Do u think the sparks maybe coming from the switch overloading if the motor isn't starting... When I turned the motor by hand to get it to start there were no sparks.. I'm guessing here.. never really messed with electric motors before...
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Once the switch trips, there generally isn't anywhere where sparks can be generated. I'm guessing that the sparks are the switch points jumping, but can't see them to be sure.

If it is the points sparking that suggests to me that they are worn or burnt and not making good contact.

B.

Nov 30, 2012
Craftsman compressor 226.165290
by: Art Day

Hey Bil it's Art again...I tried something with my compressor... Told u about the switch sparking... When turning the switch on I turned the fan by hand the compressor starts.. Builds up pressure... Bleed air down... Won't restart unless I spin fan.. Think the starter compacitor may be bad.. When I took the motor cover off the cover that covers the compacitor had come off and the capacitor was hanging by the wires...
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By turning the fan you are turning the motor shaft and, in a sense, providing the inrush the motor needs to start manually rather than through the capacitor.

That doesn't explain to me why the pressure switch was sparking, though.

B.

Nov 29, 2012
Thanks
by: Anonymous

Thanks for the info... Art
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10-4.
B.

Nov 28, 2012
Sears compressor model # 226.165290
by: Art

Tank is empty... Took the switch cover off.. when the switch is turned on it hums or buzzes.. Compressor doesn't turn on.. When turning the switch off it sparks on the contacts that move with the switch...switch # 17928.00
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Time for an new switch, Art.
B.

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Motor locked

by Jojo's auto
(Dallas)

Whats the best place to get this checked if possible. This is more than a notion a big headache sears doesn't sell main parts
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Hi there...

When you say the motor is locked, what does that mean? Your tank is empty, the pressure has tripped and power is flowing to the motor circuit and nothing happens? A few more details as a comment here would help.

Ask your local Sears outlet where they send their air compressors for repair under warranty, if in fact they do repair them rather than just replacing them. Check other compressor sellers for the same info. The local warranty repair shop is where you want to go for parts.

Cheers,

Bill

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