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Newbie With A Couple Questions.

 
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Old 11-10-2014, 02:58 PM   #1
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Newbie With A Couple Questions.


Hello all,
I'm going to look at a used mobile set up and am hoping for some guidance as to what to look for. It has a 250 cfm compressor, old military unit with a 453 Detroit diesel in it. I'm pretty comfortable looking at the engine, been a mechanic most of my adult life. (25+ years). I'm not as sure as to what are wear items on the compressor it's self. It is supposed to be low hours.
It has a 600# Clemco pot and I see a lot of guys referring to the pots basically being worn out. What should I be looking for?
Any help/ advise would be greatly appreciated.
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Old 11-11-2014, 07:14 AM   #2
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Re: Newbie With A Couple Questions.


Not really sure why some refer to Clemco pots being worn out. The pots themselves never do. The wear items on the pot would be the grit valve, the plumbing, pop-up valve and the remotes. All either replaceable or rebuildable. Few hundred bucks at most. Of course the blast hose could be dry rotted and the blast nozzle worn out.

As far as the compressor, you have the engine figured out, the air end your not going to be able to just look and tell, but start it up and let it warm up. Let it build air and then take a white rag folded in the palm of your hand and place in front of a outlet valve. Crack the valve open and exhaust some air into the rag for about 30 seconds to a minute. Look for oil droplets. This could be a sign of a problem. Then open it wide open and see how well it hold it's air pressure. If it seems good to you, jump on it.

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Old 11-11-2014, 10:24 AM   #3
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Re: Newbie With A Couple Questions.


painter123 thank you for your help! I will be looking at it in just a couple of hours and REALLY do appreciate the guidance. I will let you know how it turns out.
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Old 11-12-2014, 03:23 PM   #4
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Re: Newbie With A Couple Questions.


Painter213, I apologize I guess my dyslexia is showing. I don't know how to edit a previous post. I did as you recommended and all looks good. The rag was still nice and clean. It also comes with 100 feet of nearly new blast hose. I have a deposit on my new tool and am anxiously awaiting the funds to go into my account so I can pick it up. I have an old truck I want to learn on, planning on using walnut shells. I figure I will learn on a vehicle I own so if I screw up it wont cost me as much and I don't start off with bad word of mouth before I even get going. If it goes well I can use it as an example of my work, painting included!
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Old 11-16-2014, 08:02 AM   #5
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Re: Newbie With A Couple Questions.


Good luck with the shells. If it goes easy don't let that deceive you. Newer primers are nearly impossible to remove with shells and can be very difficult with soda too. You will find any rust will remain and the metal will have a dark tarnished appearance. Have some fine grit abrasive available so you can see the difference. Shells have their place as a non abrasive but are not really the most useful for autos. Do you have a distributor near you so you can just pick up a couple of bags of various grit size or material?
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