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air tool blew an oring? #4432845
06/15/17 10:46 PM
06/15/17 10:46 PM
Joined: Nov 2009
Posts: 4,977
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 4,977
Houston, Texas
I was using my air die grinder when I noticed a little bit of air coming out of the handle part where there is a flathead adjustment screw. It wasn't 30 seconds and it started leaking a bunch more air. Is it just a matter of loosening up that big flathead insert. The screw that's inside the insert just turns and doesn't come out, but I'm assuming the bigger insert that surrounds it would if I can find a wide enough screw driver, which I don't think I have. I know the oring blew out because it was in the groove of the screw where I was sticking the screw driver.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: air tool blew an oring? [Re: motor_oil_madman] #4432883
06/15/17 11:35 PM
06/15/17 11:35 PM
Joined: Oct 2011
Posts: 1,406
CA
user52165 Online content
user52165  Online Content
Joined: Oct 2011
Posts: 1,406
CA
Wouldn't it be helpful if you told us what is your tool?

Last edited by user52165; 06/15/17 11:35 PM.
Re: air tool blew an oring? [Re: motor_oil_madman] #4432955
06/16/17 04:47 AM
06/16/17 04:47 AM
Joined: Mar 2013
Posts: 835
NY
joegreen Offline
joegreen  Offline
Joined: Mar 2013
Posts: 835
NY
Yes. The center part you turned should adjust the air going into the tool. If you run the tool and turn the center part you should hear the tool pick up or slow down. If you remove the larger outer screw there is an oring behind it. You can replace it. The large screw just holds in the trigger mechanism that lets air flow into the motor or not.


1978 Chevrolet k20
Engine: Delo 10w30xle
Transmission: Castrol transmax dex/merc

1984 Mercedes-Benz 300 turbo diesel
Engine: Delo 400 15w40le
Re: air tool blew an oring? [Re: motor_oil_madman] #4433055
06/16/17 07:43 AM
06/16/17 07:43 AM
Joined: Nov 2009
Posts: 4,977
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 4,977
Houston, Texas
Did I do something wrong or do they just randomly blow o rings?


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: air tool blew an oring? [Re: motor_oil_madman] #4435369
06/18/17 06:19 PM
06/18/17 06:19 PM
Joined: Mar 2013
Posts: 835
NY
joegreen Offline
joegreen  Offline
Joined: Mar 2013
Posts: 835
NY
Originally Posted By: motor_oil_madman
Did I do something wrong or do they just randomly blow o rings?
Idk. Ive never had that happen. I would replace it and not worry about it


1978 Chevrolet k20
Engine: Delo 10w30xle
Transmission: Castrol transmax dex/merc

1984 Mercedes-Benz 300 turbo diesel
Engine: Delo 400 15w40le
Re: air tool blew an oring? [Re: motor_oil_madman] #4435974
06/19/17 02:29 PM
06/19/17 02:29 PM
Joined: Jan 2009
Posts: 2,398
wi
dave123 Offline
dave123  Offline
Joined: Jan 2009
Posts: 2,398
wi
Originally Posted By: motor_oil_madman
Did I do something wrong or do they just randomly blow o rings?
how much pressure you running on it.

Re: air tool blew an oring? [Re: dave123] #4437111
06/20/17 09:06 PM
06/20/17 09:06 PM
Joined: Nov 2009
Posts: 4,977
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 4,977
Houston, Texas
Originally Posted By: dave123
Originally Posted By: motor_oil_madman
Did I do something wrong or do they just randomly blow o rings?
how much pressure you running on it.


110psi not running.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: air tool blew an oring? [Re: motor_oil_madman] #4437114
06/20/17 09:09 PM
06/20/17 09:09 PM
Joined: Nov 2009
Posts: 4,977
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 4,977
Houston, Texas
It's a porter cable ptx2 they don't sell a rebuild kit for it anymore, so I guess it's a matter of going to a specialty parts house. Would these be viton? Or just basic nitrile buna rubber?


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: air tool blew an oring? [Re: motor_oil_madman] #4497892
08/25/17 03:48 PM
08/25/17 03:48 PM
Joined: Nov 2009
Posts: 4,977
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 4,977
Houston, Texas
I'm looking to get this fixed. What kind of rubber do they use typically in air tools?

Here are the part numbers.

5140070-85
5140070-86


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: air tool blew an oring? [Re: motor_oil_madman] #4498305
08/26/17 01:37 AM
08/26/17 01:37 AM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Somebody made that tool for Porter-Cable. I don't think Porter-Cable ever made air tools. Whoever made that tool, probably still has it in production with a different brand name.

Re: air tool blew an oring? [Re: motor_oil_madman] #4498713
08/26/17 01:53 PM
08/26/17 01:53 PM
Joined: Aug 2013
Posts: 2,538
Central Maryland
HangFire Offline
HangFire  Offline
Joined: Aug 2013
Posts: 2,538
Central Maryland
I don't usually send people off to other sites, but in this case... Do a search in Garage Journal for pictures that look like your air die grinder, or just post there. Chances are it was made by an OEM such as Florida Pneumatic or one of the Taiwan firms. Once you know equivalent branded models, your parts supply possibilities really open up.


Various musings: http://hangfire.net
Re: air tool blew an oring? [Re: motor_oil_madman] #4502755
08/30/17 08:38 PM
08/30/17 08:38 PM
Joined: Nov 2009
Posts: 4,977
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 4,977
Houston, Texas
I took the air valve assembly apart and it's just one o-ring. Looks like a standard buna oring. I'm not really sure what caused the failure, other than their not being much surface area for it to hold it in place. It's just the end of the threaded portion holding it against that adjustment valve.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: air tool blew an oring? [Re: motor_oil_madman] #4502758
08/30/17 08:39 PM
08/30/17 08:39 PM
Joined: Nov 2009
Posts: 4,977
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 4,977
Houston, Texas
It shouldn't be hard to find.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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