Compressor problems - Page 2 - Woodworking Talk - Woodworkers Forum
Reply
 
Thread Tools Display Modes
post #21 of 32 Old 05-05-2014, 06:58 PM Thread Starter
afx
Senior Member
 
Join Date: Feb 2010
Posts: 387
View afx's Photo Album My Photos
Quote:
Originally Posted by TimPa View Post
when you shut it off do you hear steady air escaping anywhere? does it have an unloader valve? always thought leaky rings meant hi case pressure. not sure tho, if you have dual stage.
Nope, I even bled the system down to about 60 psi then removed the tubing that connects the pump to the check valve/tank and didn't hear anything come out. I took the check valve out and gave it a good cleaning.

I'm starting to lean back towards the reed or gasket plates being kerfudged. I'm going to go to Autozone tonight and buy some gasket material to cut a home made gasket out then take the cylinder apart and see what's going on inside.

I just can't for the life of me think what would make a cylinder work just fine until it hits a certain pressure then it starts backing up. It seems like the pressure created by the piston would push air back into the intake if the reeds were goofed up.
afx is offline  
Sponsored Links
Advertisement
 
post #22 of 32 Old 05-05-2014, 09:12 PM
Senior Member
 
Join Date: Jan 2010
Location: NW Pa
Posts: 2,927
View TimPa's Photo Album My Photos
it is one of two things - pump inability to create (high) pressure or an air leak. does the tank bleed down overnight at all? I agree you need to check reed valves and rings.
TimPa is online now  
post #23 of 32 Old 05-15-2014, 12:29 PM Thread Starter
afx
Senior Member
 
Join Date: Feb 2010
Posts: 387
View afx's Photo Album My Photos
Well, I replaced the metal shim last night, torque the head to spec and it's still giving me the same problem. When I first turned it on it was taking in air MUCH harder than before so I thought I was good to go. Right around 60psi though, it started pushing air out of the intake. I'm going to have to tear the entire side down again and check to make sure I'm getting good compression with the piston and that I put all of the gaskets on correctly. I wouldn't put it past myself to put one on backwards :(

I also replaced the check valve, dump line, pressure switch (which broke by the way) and replaced the copper lines that connects each head. I also tried something I've never used before which was used pipe dope instead of Teflon tape. I wonder how that's going to work out.
This is getting frustrating.

Last edited by afx; 05-15-2014 at 12:31 PM.
afx is offline  
Sponsored Links
Advertisement
 
post #24 of 32 Old 05-15-2014, 12:32 PM
Old School
 
cabinetman's Avatar
 
Join Date: Jul 2007
Location: So. Florida
Posts: 24,027
View cabinetman's Photo Album My Photos
Quote:
Originally Posted by afx View Post
Well, I replaced the metal shim last night, torque the head to spec and it's still giving me the same problem. When I first turned it on it was taking in air MUCH harder than before so I thought I was good to go. Right around 60psi though, it started pushing air out of the intake. I'm going to have to tear the entire side down again and check to make sure I'm getting good compression with the piston and that I put all of the gaskets on correctly. I wouldn't put it past myself to put one on backwards :(

This is getting frustrating.
If it has those flap valves, I'm guessing that's the problem. They can get warped and not seat flat.






.
cabinetman is offline  
post #25 of 32 Old 05-15-2014, 12:40 PM Thread Starter
afx
Senior Member
 
Join Date: Feb 2010
Posts: 387
View afx's Photo Album My Photos
Quote:
Originally Posted by cabinetman View Post
If it has those flap valves, I'm guessing that's the problem. They can get warped and not seat flat.






.
It doesn't have flap valves unfortunately. It has little indentions where small aluminum shims float and get pushed up blocking the holes on the compression stroke and vice versa.
afx is offline  
post #26 of 32 Old 05-15-2014, 12:49 PM
Senior Member
 
Join Date: Aug 2012
Location: British Columbia, Canada
Posts: 5,474
View FrankC's Photo Album My Photos
This may not be the answer to your problems but when you can get a new cast iron pump for this price it is hardly worth fiddling with an old one.
http://www.harborfreight.com/145-psi...ump-67697.html

Wise men speak because they have something to say; fools because they have to say something -Plato

FrankC
http://sawdustmaking.com
http://woodworkerglossary.com
FrankC is offline  
post #27 of 32 Old 05-15-2014, 02:05 PM Thread Starter
afx
Senior Member
 
Join Date: Feb 2010
Posts: 387
View afx's Photo Album My Photos
Quote:
Originally Posted by FrankC View Post
This may not be the answer to your problems but when you can get a new cast iron pump for this price it is hardly worth fiddling with an old one.
http://www.harborfreight.com/145-psi...ump-67697.html
Thanks for the link, I've actually looked into one of those, I've heard really good reviews from them. The only thing that makes me want to fix the one I have now is I've heard some people take it apart and find that the heads are actually aluminum and low quality at that. My current heads are cast iron. I've also heard the SCFM rating on that particular pump is much lower than HF says it is.

If I can't find out what's wrong with this pump I'm going to grab one and test it out myself.
afx is offline  
post #28 of 32 Old 05-15-2014, 09:49 PM Thread Starter
afx
Senior Member
 
Join Date: Feb 2010
Posts: 387
View afx's Photo Album My Photos
Well I figured it out..And one of you guys was right.

The BRAND NEW valve plate I bought has a 6-7 thousandth dip on the plate, just enough to allow the plate gasket to vibrate itself into oblivion. The old plate is dead flat. I'm going to replace that plate with the old one and make a gasket to use. Cross your fingers that this was the problem :/
afx is offline  
post #29 of 32 Old 05-18-2014, 05:00 PM Thread Starter
afx
Senior Member
 
Join Date: Feb 2010
Posts: 387
View afx's Photo Album My Photos
So I took the plates off, stuck some 100 grit sand paper on my granite slab and went to town with it. I got it as dead flat as I could in 2 hours, I guess it's 1-2 thou off. I stuck everything back on the head, replaced the head bolts JUST to be safe, turned it on and it appears to be working A-OK!

One weird thing was the new bolts I put in. I made sure the were the correct bolts but they were longer than the other ones. They also had a smooth upper shaft which I found odd. They went in easy enough but butted up on one of the find on the head and ended up bending it while I torqued it. I found that odd.

Anywho, it looks like I'm good to go now! I've got to take a bunch of crap apart now and re-seal the fittings to make sure they don't leak but other than that I'm done working on this beast. It's time to clean the damn garage now!


This was right before I shut it off, it built the pressure pretty quickly
afx is offline  
post #30 of 32 Old 05-18-2014, 05:32 PM
Senior Member
 
Join Date: Aug 2012
Location: British Columbia, Canada
Posts: 5,474
View FrankC's Photo Album My Photos
Bet that is a relief, hope for your sake this is the end of it.

Wise men speak because they have something to say; fools because they have to say something -Plato

FrankC
http://sawdustmaking.com
http://woodworkerglossary.com
FrankC is offline  
post #31 of 32 Old 05-18-2014, 06:38 PM Thread Starter
afx
Senior Member
 
Join Date: Feb 2010
Posts: 387
View afx's Photo Album My Photos
Quote:
Originally Posted by FrankC View Post
Bet that is a relief, hope for your sake this is the end of it.
Me too, I had already decided to drop another hundred on a new pump
afx is offline  
post #32 of 32 Old 05-19-2014, 01:16 PM
Senior Member
 
Join Date: Jan 2010
Location: NW Pa
Posts: 2,927
View TimPa's Photo Album My Photos
Just fyi... i had rebuilt an oilless type model awhile back and it kept on failing - the connecting rods would break if i remember. anyway, found out that there was a very specific torque on one of the bolts in there. once corrected it's been running bout 5 years now. something to double check.
TimPa is online now  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Woodworking Talk - Woodworkers Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Air compressor jg2259 Power Tools & Machinery 17 10-22-2013 08:21 AM
Can I keep my air compressor outside? mikeyg813 General Woodworking Discussion 17 01-23-2013 10:43 PM
CH Compressor 87 Fiero GT Wood Finishing 13 04-14-2011 09:19 PM
more compressor help Bruce B General Woodworking Discussion 2 07-13-2008 11:15 AM
air compressor Bruce B General Woodworking Discussion 12 06-20-2008 04:10 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome