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Tools & Supplies: Airbrushes
Talk about airbrushes.
Hosted by Matt Leese
Replacing the seal
Spartak
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Croatia Hrvatska
Joined: May 26, 2013
KitMaker: 130 posts
RailRoad Modeling: 0 posts
Posted: Wednesday, November 20, 2019 - 08:25 PM UTC
Hi guys,

I have a problem with my Tamiya HG III airbrush. When painting, the trigger does not want to return to its starting position. I guess seal rubber has hardened over the years of use.

Anyone have any experience with this type of airbrush?
How to replace seal rubber?

Pictures show where the seal rubber is positioned.

:-H







Namabiiru
Staff MemberAssociate Editor
MODEL SHIPWRIGHTS
#399
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Rhode Island, United States
Joined: March 05, 2014
KitMaker: 2,888 posts
RailRoad Modeling: 2 posts
Posted: Thursday, November 21, 2019 - 12:07 AM UTC
Cannot assist with replacing seals on a Tamiya AB, but perhaps lubricating the airbrush might be any easier answer. Iwata makes a glycerine-based lubricant called Superlube. I put a tiny amount of that on the needle and seals of my airbrush after cleaning and it makes a big difference keeping the action moving smoothly.

drabslab
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European Union
Joined: September 28, 2004
KitMaker: 2,183 posts
RailRoad Modeling: 1 posts
Posted: Thursday, November 21, 2019 - 02:10 AM UTC
Stuoid question:

did you clean it thoroughly. In many cases that is enough to make it work again
Kevlar06
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Washington, United States
Joined: March 15, 2009
KitMaker: 3,670 posts
RailRoad Modeling: 6 posts
Posted: Thursday, November 21, 2019 - 07:42 AM UTC
It might also be the valve spring (inside part 13/14 in your parts diagram), as they do get "lazy" over time. I'd remove the spring, give it a very slight "stretch" and see if that makes any difference. An old rubber seal that's worn out will tend to dry out and get loose, rather than tight, unless you've exposed it to a substance that causes the seal to swell (lacquer thinner is a prime culprit in that case). If you need to replace the spring, you can try to find a matching spring from one of the on-line airbrush supply stores (not sure if Bear Air is still in business) or go to the manufacturer.
VR, Russ
Spartak
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Croatia Hrvatska
Joined: May 26, 2013
KitMaker: 130 posts
RailRoad Modeling: 0 posts
Posted: Wednesday, December 04, 2019 - 02:44 AM UTC
Hello

Thanks a lot everyone for the advice. First I tried and listened advice from Mark C. I have lubricated the seal and it works fantastic.

Namabiiru
Staff MemberAssociate Editor
MODEL SHIPWRIGHTS
#399
_VISITCOMMUNITY
Rhode Island, United States
Joined: March 05, 2014
KitMaker: 2,888 posts
RailRoad Modeling: 2 posts
Posted: Wednesday, December 04, 2019 - 03:02 AM UTC
Good news!