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#4432845 - 06/15/17 10:46 PM air tool blew an oring?
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4718
Loc: 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.


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#4432883 - 06/15/17 11:35 PM Re: air tool blew an oring? [Re: motor_oil_madman]
user52165 Offline


Registered: 10/21/11
Posts: 1307
Loc: CA
Wouldn't it be helpful if you told us what is your tool?


Edited by user52165 (06/15/17 11:35 PM)

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#4432955 - 06/16/17 04:47 AM Re: air tool blew an oring? [Re: motor_oil_madman]
joegreen Offline


Registered: 03/10/13
Posts: 721
Loc: 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.
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1978 Chevrolet k20
Engine: Delo 10w30xle
Transmission: Castrol transmax dex/merc

1984 Mercedes-Benz 300 turbo diesel
Engine: Delo 400 15w40le

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#4433055 - 06/16/17 07:43 AM Re: air tool blew an oring? [Re: motor_oil_madman]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4718
Loc: 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.


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#4435369 - 06/18/17 06:19 PM Re: air tool blew an oring? [Re: motor_oil_madman]
joegreen Offline


Registered: 03/10/13
Posts: 721
Loc: 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

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#4435974 - 06/19/17 02:29 PM Re: air tool blew an oring? [Re: motor_oil_madman]
dave123 Offline


Registered: 01/13/09
Posts: 2265
Loc: 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.

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#4437111 - 06/20/17 09:06 PM Re: air tool blew an oring? [Re: dave123]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4718
Loc: 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.


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#4437114 - 06/20/17 09:09 PM Re: air tool blew an oring? [Re: motor_oil_madman]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4718
Loc: 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.


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#4497892 - 08/25/17 03:48 PM Re: air tool blew an oring? [Re: motor_oil_madman]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4718
Loc: 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.


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#4498305 - 08/26/17 01:37 AM Re: air tool blew an oring? [Re: motor_oil_madman]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: 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.

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#4498713 - 08/26/17 01:53 PM Re: air tool blew an oring? [Re: motor_oil_madman]
HangFire Offline


Registered: 08/21/13
Posts: 2505
Loc: 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.
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Various musings: http://hangfire.net

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#4502755 - 08/30/17 08:38 PM Re: air tool blew an oring? [Re: motor_oil_madman]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4718
Loc: 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.


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#4502758 - 08/30/17 08:39 PM Re: air tool blew an oring? [Re: motor_oil_madman]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4718
Loc: 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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