Impact wrench question


15 replies to this topic
  • a_gunslinger

Posted August 27, 2005 - 05:24 PM

#1

Bought an impact wrench to easily get a Flywheel off my Honda crf250r. I am kind of a newbie mechanic, never used an impact wrench before. Worked great! Way easier than trying to hold the flywheel still while trying to muscle off the flywheel nut.

Anyway, I bought a Crapsman (I mean craftsman) 3/8 drive impact wrench. Why? Because it was cheap and did not think I would be using it that often.

I cranled up my Porter Cable do it yourselfer pancacke style 135 psi compressor. When it got up the wrenches recommened 90 psi I turned it off. I noticed what while not using the wrench there was a hissing coming from it and it turns out is leaking air slowly. Came back out after eating and the compressor was emty down to zero. Is an impact wrench supposed to slowly release air as some kind of safety measure or did I get what a paid for - a crappy impact wrench?

  • E.Marquez

Posted August 27, 2005 - 05:46 PM

#2

Yes, they all do a bit.. Better tools (IR, BluePoint) will leak less... Craftsman are an ok tool, rebuild kits are available as well as repair parts. So all in all they are mid grade. If yours is leaking a lot,, take it back and get another. If it's leaking a bit,, your ok.

  • toyota_mdt_tech

Posted August 27, 2005 - 05:48 PM

#3

Shouldnt leak, have you run a little bit of oil through the motor? Should be oiled when new and periodically. The oil will help to seal the o-ring on the trigger. But make sure you get air motor oil, same place you got the pistol from. Is it the IR composite ones? IR or Ingersoll Rand makes some of the best stuff out there right now!

  • letmein

Posted August 27, 2005 - 06:22 PM

#4

Bought an impact wrench to easily get a Flywheel off my Honda crf250r. I am kind of a newbie mechanic, never used an impact wrench before. Worked great! Way easier than trying to hold the flywheel still while trying to muscle off the flywheel nut.

Anyway, I bought a Crapsman (I mean craftsman) 3/8 drive impact wrench. Why? Because it was cheap and did not think I would be using it that often.

I cranled up my Porter Cable do it yourselfer pancacke style 135 psi compressor. When it got up the wrenches recommened 90 psi I turned it off. I noticed what while not using the wrench there was a hissing coming from it and it turns out is leaking air slowly. Came back out after eating and the compressor was emty down to zero. Is an impact wrench supposed to slowly release air as some kind of safety measure or did I get what a paid for - a crappy impact wrench?


There is no reason to manually turn off your air compressor, even though your wrench says 90 psi. You have to account for line loss. The longer the hose the more line loss you will have. So the pressure gauge might read 135 but the hose pressure could be 20 psi or more less.

  • doggerdan1

Posted August 27, 2005 - 06:37 PM

#5

It should not leak, I would take it back. You can safely run air tools at the max. pressure your compressor will produce and get way more power from it. I am a professional mechanic and we run 175psi shop air.

  • mowtown

Posted August 27, 2005 - 09:15 PM

#6

It should not leak, I would take it back. You can safely run air tools at the max. pressure your compressor will produce and get way more power from it. I am a professional mechanic and we run 175psi shop air.


DITTO

Shouldn't leak and run max psi.

  • E.Marquez

Posted August 27, 2005 - 09:36 PM

#7

Shouldnt leak, have you run a little bit of oil through the motor? Should be oiled when new and periodically. The oil will help to seal the o-ring on the trigger. But make sure you get air motor oil, same place you got the pistol from. Is it the IR composite ones? IR or Ingersoll Rand makes some of the best stuff out there right now!


Anyway, I bought a Crapsman (I mean craftsman) 3/8 drive impact wrench.


And ya,, they may leak a bit,, the seal on the trigger and or motor vains,, is never a compleate seal.
better guns.. Yes, mid priced ones,, on a good day, if your lucky.

  • MotoMac

Posted August 27, 2005 - 10:08 PM

#8

Did you also buy sockets designed for an impact wrench? Standard sockets (even the good Craftsman ones) can shatter when used with an impact wrench. Some of them just crack while others can actually explode! I've been hit with a few pieces and they hurt. If they'd hit a vital part like an eye, you could be in a world of hurt! Yes they're expensive, but spend the money for real impact sockets in the sizes that you use all the time.

Cheers,

Mac

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • nw56

Posted August 28, 2005 - 05:38 AM

#9

You have to account for line loss. The longer the hose the more line loss you will have. So the pressure gauge might read 135 but the hose pressure could be 20 psi or more less.

This maybe true when you are using the tool if you don't have a large enough air line, but if you don't unplug the tool every time you stop then you have 135 psi or whatever your compressor is set at. You should use a regulator.

  • frankstr

Posted August 28, 2005 - 05:51 AM

#10

It should not leak,period ....Check your air line fittings...
I have a air drill over 15 y/o and it dos'nt not leak....... :D

  • Grandmazer

Posted August 28, 2005 - 06:12 AM

#11

I don't think it should leak either. Oil gun with reccomended oil. Check air fittings/coupler for leaks. If it's actually leaking out the gun you can normally hear it comming through the exhaust side of it or around the trigger. Soapy water can help detect where it's coming from. If it leaks return it.

  • a_gunslinger

Posted August 28, 2005 - 06:37 AM

#12

Thanks gentlmen. Will be returning this one for the leak. Will also run compressor at max psi from now on and lube the wrench. As for lubing, the instructions dont actually mention that!! How the heck do I "lube my unit". :D

  • Grandmazer

Posted August 28, 2005 - 06:47 AM

#13

A few drops of oil in the air inlet beofre connecting the air hose should do the trick.

  • toyota_mdt_tech

Posted August 28, 2005 - 06:57 AM

#14

Did you also buy sockets designed for an impact wrench? Standard sockets (even the good Craftsman ones) can shatter when used with an impact wrench.


MotoMac, you mean "chrome impact sockets", thats what we call them. :D I'm commisioned at work (flat rate) and I use whatever I have to get the job done. :D But yes, impact is the way to go, a chrome one can come apart, and if you have a habit of holding the socket end with one had, and it comes apart, expect a trip to the hospital. :D

  • toyota_mdt_tech

Posted August 28, 2005 - 07:01 AM

#15

...How the heck do I "lube my unit". :D


Get your air motor oil and tip the pistol upsidedown, squeeze in a little bit on the air inlet, then run it a few times, wipe excess off. Also, if you put these away for a long period of time (and most no commercial operators fit under this category) run some oil in it and blip it once, wipe down and put away. If you put a gun away for a long period of time after using it, it could rust some motor parts inside if its not oiled. Rule of thumb, oil daily is what they say, oil when you put it away al so.

  • MotoMac

Posted August 28, 2005 - 10:59 AM

#16

MotoMac, you mean "chrome impact sockets", thats what we call them. :D I'm commisioned at work (flat rate) and I use whatever I have to get the job done. :D But yes, impact is the way to go, a chrome one can come apart, and if you have a habit of holding the socket end with one had, and it comes apart, expect a trip to the hospital. :D


Good point. After the first Craftsman socket semi-exploded, I thought it was just a weak one and was just a fluke. When another one let go on a different job, I started checking around. Now it's the dull-colored genuine impact sockets for me. If I see someone else using a chrome socket with an air gun, I just move away...

Cheers,

Mac





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