Page 1 of 2 12 LastLast
Results 1 to 20 of 24

Air compressor

This is a discussion on Air compressor within the Tools forums, part of the LSx Technical Help Section category; Hi, I have a Craftsman air compressor that is not building pressure. It was working fine but noticed that it ...

  1. #1
    Member tpilews's Avatar
    Join Date
    Aug 2005
    Location
    Tampa, FL
    Age
    34
    Posts
    918

    Black
    '98 Z28

    Air compressor

    Hi, I have a Craftsman air compressor that is not building pressure. It was working fine but noticed that it was leaking oil, so I took it apart to replace the seal. Put it back together, added oil, turned her on. It comes on, but does not build any pressure.

    I checked the intake side of things to make sure the flaps were opening and closing, and everything looked alright. It does sound a little different that it normally does.

    Sorry, this is a little vague. I'm hoping some of you might have some experience. I'm at a loss. I searched around google, and couldn't find anything worthwhile.

  2. #2
    M6 King Hot Black Trans-Am's Avatar
    Join Date
    Mar 2006
    Location
    WI
    Posts
    5,085
    Blog Entries
    1

    09 EclipseGT 75 Chevy 4x4
    2001 Trans-Am 13 F-XT

    Did you check the air filter? I have a craftsman and mine leaks by the gauges/regulator area bad when I have the air pressure turned up. Maybe the bypass valve is stuck open. Do you hear air leaking anywhere?

  3. #3
    Member tpilews's Avatar
    Join Date
    Aug 2005
    Location
    Tampa, FL
    Age
    34
    Posts
    918

    Black
    '98 Z28

    Quote Originally Posted by Hot Black Trans-Am View Post
    Did you check the air filter? I have a craftsman and mine leaks by the gauges/regulator area bad when I have the air pressure turned up. Maybe the bypass valve is stuck open. Do you hear air leaking anywhere?
    I dont' hear it leaking anywhere. When I put my hand near the intake filter, I do feel a little suction, but I also feel air coming out. I guess the intake valve could be staying open. Any other ideas? Thanks.

  4. #4
    M6 King Hot Black Trans-Am's Avatar
    Join Date
    Mar 2006
    Location
    WI
    Posts
    5,085
    Blog Entries
    1

    09 EclipseGT 75 Chevy 4x4
    2001 Trans-Am 13 F-XT

    You can pull the output pipe and see if air is coming out there. When they are pumping into open air there isn't really much air that comes out of the motor so it won't be huge amounts like when there is pressure in that tank.

  5. #5
    Member tpilews's Avatar
    Join Date
    Aug 2005
    Location
    Tampa, FL
    Age
    34
    Posts
    918

    Black
    '98 Z28

    Quote Originally Posted by Hot Black Trans-Am View Post
    You can pull the output pipe and see if air is coming out there. When they are pumping into open air there isn't really much air that comes out of the motor so it won't be huge amounts like when there is pressure in that tank.
    Figured it out. When I replaced the head gasket, I cleaned it up real good, and the gasket that was on there before was torn to shreds. Well, I only put gasket material around the outside, I forgot the part in the middle that separates the intake and exhaust flaps.

    Thanks for your help though HBTA

  6. #6
    M6 King Hot Black Trans-Am's Avatar
    Join Date
    Mar 2006
    Location
    WI
    Posts
    5,085
    Blog Entries
    1

    09 EclipseGT 75 Chevy 4x4
    2001 Trans-Am 13 F-XT

    Quote Originally Posted by tpilews View Post
    Figured it out. When I replaced the head gasket, I cleaned it up real good, and the gasket that was on there before was torn to shreds. Well, I only put gasket material around the outside, I forgot the part in the middle that separates the intake and exhaust flaps.

    Thanks for your help though HBTA
    Glad to hear you got it working. It's easy to over look things at times.

  7. #7
    Member tpilews's Avatar
    Join Date
    Aug 2005
    Location
    Tampa, FL
    Age
    34
    Posts
    918

    Black
    '98 Z28

    Quote Originally Posted by Hot Black Trans-Am View Post
    Glad to hear you got it working. It's easy to over look things at times.
    Well, I'm not sure if it is back to normal or not. It is building pressure, but it seems to be struggling to get over 90 psi in the tank. Also, it seems to be much hotter than before. I don't remember the tank ever getting warm, but now it is.

    Well, it used to fill up in about 2 minutes. I let it run for about 3 minutes, and it was up to 90 psi.

    It's a 30 gallon tank, 5 hp motor.

    Am I just being paranoid?

    When I first put everything back together, there was a small leak going from the compressor to the regulator, but I tightened everything down, and it went away.

    Am I just nitpicking?

    Thanks for your help.

  8. #8
    M6 King Hot Black Trans-Am's Avatar
    Join Date
    Mar 2006
    Location
    WI
    Posts
    5,085
    Blog Entries
    1

    09 EclipseGT 75 Chevy 4x4
    2001 Trans-Am 13 F-XT

    Quote Originally Posted by tpilews View Post
    Well, I'm not sure if it is back to normal or not. It is building pressure, but it seems to be struggling to get over 90 psi in the tank. Also, it seems to be much hotter than before. I don't remember the tank ever getting warm, but now it is.

    Well, it used to fill up in about 2 minutes. I let it run for about 3 minutes, and it was up to 90 psi.

    It's a 30 gallon tank, 5 hp motor.

    Am I just being paranoid?

    When I first put everything back together, there was a small leak going from the compressor to the regulator, but I tightened everything down, and it went away.

    Am I just nitpicking?

    Thanks for your help.
    Your probably just watching it a bit to close. I have the same setup and I never timed mine to see how fast it gets up to pressure or ever felt it to see if it got warm or not. I know the last 20 or 30 psi takes the longest to build up though. If you don't hear any leaks I wouldn't really worry about it. Maybe seeing it's cooler out it might be taking a little longer?

  9. #9
    Junior Member
    Join Date
    Dec 2006
    Location
    Twin Beaches MD
    Posts
    68

    SOM
    '01SS Camaro,'09 Z06

    Did you notice any coking around the reed valves? Coking is a deposit left behind when oil is burnt off. If you noted coking change the oil to a better oil, I use synthetic. If the valve seat or reed valve area has any scratches you will loss efficiency, and increase the temperature of the output air. A little air flowing back out of the intake is normal, while running. If the valve is hanging open, just a little, you will loss the higher pressure, notice a different sound while running, and the amount of air flowing out of the intake will increase. By the way when not running there should be no air leaking out of the intake, any air out indicates leaking valves. If this is the direct drive style of compressor, no belt, they make them some what disposable.
    Good luck
    Last edited by SpurSS; 09-14-2007 at 08:22 PM. Reason: grammer

  10. #10
    Junior Member
    Join Date
    Dec 2006
    Location
    Twin Beaches MD
    Posts
    68

    SOM
    '01SS Camaro,'09 Z06

    By the way, over the last twenty five years I have operated and maintained compressors from 3 cfm to 1200 cfm, in recips, and screw configuration.

  11. #11
    Member tpilews's Avatar
    Join Date
    Aug 2005
    Location
    Tampa, FL
    Age
    34
    Posts
    918

    Black
    '98 Z28

    Thanks for the replies, I think I may just be looking into it too much, but SpurSS did provide me with some great information, which I will definitely check. There is no leaking at all when it is off.

    Is it okay to use motor oil as long as it is full synthetic, or is a compressor specific oil preferred?

    Also, this is a belt driven craftsman compressor

  12. #12
    Member tpilews's Avatar
    Join Date
    Aug 2005
    Location
    Tampa, FL
    Age
    34
    Posts
    918

    Black
    '98 Z28

    The valve plate itself does not have any coking, but the valves themselves had quite a bit. I sanded them down to get rid of it all. Is this acceptable, or would replacements be in order? They can't be but a couple bucks, so I'll probably end up changing them.

    I just want to make sure it is running in tip top shape before I put the stress of running higher cfm tools on it.

  13. #13
    Junior Member
    Join Date
    Dec 2006
    Location
    Twin Beaches MD
    Posts
    68

    SOM
    '01SS Camaro,'09 Z06

    Efficiency gains are slight if there is no air leaking out while off, if the ports are clean, if you can get new valve reeds go for it, try cleaning with WD40... or in a parts washer, if needed.

    I use a match to look for air leaks, the flame is very sensitive to air movement, as well as the smoke when it goes out, say ouch

    Any syn oil if fine, mine has 10w30, ya know the last 1/2 quart from the oil change.
    Last edited by SpurSS; 09-15-2007 at 09:12 AM. Reason: incomplete

  14. #14
    Member Sunset T/A's Avatar
    Join Date
    Oct 2005
    Location
    Spring, TX
    Age
    66
    Posts
    285

    Sunset Orange
    2002 TransAm

    Recommended oil for all compressors is NON-Detergent 30W. I buy mine at PepBoys. It's hard to find non detergent oil.

  15. #15
    Member tpilews's Avatar
    Join Date
    Aug 2005
    Location
    Tampa, FL
    Age
    34
    Posts
    918

    Black
    '98 Z28

    Well, there is definitely a problem with it. It couldn't even keep up with an angle grinder that needs 4cfm at 90psi. This compressor is supposed to put out 10 cfm at 90. After it ran for about 4 minutes, I noticed it starting to smoke so I turned it off right away. Any suggestions.

    Maybe I'll take her apart and get some pictures up. It might be easier to make a suggestion after that. I need to let it cool down for a bit though. So, pictures will be up later.

  16. #16
    Member tpilews's Avatar
    Join Date
    Aug 2005
    Location
    Tampa, FL
    Age
    34
    Posts
    918

    Black
    '98 Z28

    Also, as far as non-detergent oils go, is it clearly stated on the packaging?

  17. #17
    Member tpilews's Avatar
    Join Date
    Aug 2005
    Location
    Tampa, FL
    Age
    34
    Posts
    918

    Black
    '98 Z28

    Alright, got some pictures



    Head



    Valve plate



    Crankcase



    Closeup Crankcase


  18. #18
    Member tpilews's Avatar
    Join Date
    Aug 2005
    Location
    Tampa, FL
    Age
    34
    Posts
    918

    Black
    '98 Z28

    Most of the crap in the cylinder looks like gasket material

  19. #19
    Member tpilews's Avatar
    Join Date
    Aug 2005
    Location
    Tampa, FL
    Age
    34
    Posts
    918

    Black
    '98 Z28

    Any ideas??

    At this point, I'm just thinking about replacing the head and valve plate assemblies. Including the valves and gaskets, it comes out to $124. I'm going to try to clean it up real good and change out the gaskets, see where that takes me.
    Last edited by tpilews; 09-18-2007 at 03:38 PM.

  20. #20
    Junior Member
    Join Date
    Dec 2006
    Location
    Twin Beaches MD
    Posts
    68

    SOM
    '01SS Camaro,'09 Z06

    Good pictures, it looks like you have a overheated valve (third picture, top valve) as indicated by the blue-black color of the strip. I notice a possible heat issue at the fitting where the discharge line goes into the tank(maybe just dirts or something). I would not replace the valve head(save the money), unless you have wire drawing at the interface between the valve and where it meets the head (that could cause the discoloration), but the reed valves have to come off to see. It looks like the head is pot metal and can be damaged by sharp edges such as a screw driver. Use something like a scotch pad to remove the gasket material. I know you said that you have had the head off before, did you replace the gasket or was it in better shape than it is now, if you replaced the head gasket the last time you need another new one, if you put it back together the lastime with the gasket in similar shape that could have been your problem, and it would have sounded different.
    What I can see of the cylinder walls looks good, if the rings where gone you might see damage(groves) in the direction of the stroke. It look like it is worth repairing, I would try the valves first, cheap fix before the expensive one. Let me know if I can offer any more assistance.
    John

Page 1 of 2 12 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. looking to buy air compressor
    By 28Marcos in forum Tools
    Replies: 16
    Last Post: 01-28-2011, 11:11 AM
  2. new air compressor
    By Zboner in forum Tools
    Replies: 3
    Last Post: 07-29-2009, 08:33 AM
  3. WTB: AC compressor for LS1
    By deelli in forum Parts Wanted / Trade
    Replies: 2
    Last Post: 02-10-2009, 08:58 PM
  4. Need an AC Compressor
    By TwistedSS in forum Parts Wanted / Trade
    Replies: 0
    Last Post: 03-20-2007, 01:09 PM
  5. New A/C compressor
    By fastbuff in forum Corvette
    Replies: 0
    Last Post: 01-13-2007, 07:09 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •