Fixing up an old air compressor.

Here's a place for the group to discuss their other brands of bikes, hobbies, and personal interests not related to Ural & Dnepr Sidecar rigs. But not politics...
Forum rules
Here's the place to chat about off-topic stuff, hobbies, and other toys you got. No political posts, they will be deleted and the poster warned. We're not always "politically correct", but the Steeds site is apolitical.
User avatar
rebelrider
Order of Lenin
Order of Lenin
Posts: 1101
Joined: Tue Sep 04, 2012 5:03 am
Location: Shelton, WA

Fixing up an old air compressor.

Post by rebelrider » Tue Mar 06, 2018 7:43 am

Thought I'd share this as many of you are pretty good with tools and fixing up more than just Urals. :)

A friend of mine is moving and found this outside in a shed. Now it's in my basement!
Image
Image
Image

This is the first proper air compressor I've ever had, and I'm super excited! I'm also quite ignorant as to how to fix and maintain them. So I've been reading stuff online and watching YouTubes like crazy. So this is a Husky 5-ish hp 26 gallon upright. You can see from the pics that it's a little beat up and the control parts are not original.

Image
Image
Image

The pressure switch will be getting replaced. One of the wires has burnt appart, and the pressure return hose connection is loose. Also, the cover for the switch housing is missing so all the electrical is exposed. And the pressure gauge is broken, although, I think those come seperate. Also, I think I can improve the plumbing a little.

Image
Image
Image

I was warned that the tank may have some condensation inside. Turns out the drain valve was easier to remove than it was to open. Also, I think my floor drain is clogged. I'll let the wheels speak for themselves.

Image
Image
Image

As far as I know, the motor and pump work. I plan to de-rust the pulley and flywheel. I think the belt is ok.

So far the shopping list is:
- Pressure switch: 95-125, I think.
- Pipe for the pressure switch.
- Pressure release valve.
- Pressure gauge.
- Drain valve.
- Air filter.

Things to address:
- Change the oil.
- Rusty flywheel and pulley.
- Test the motor and pump.
- Test the regulator.
- Make the wheels strait somehow.

So, what do you all think? Have I missed anything? I'm not sure how I'll address the wheels yet. I'm not a welder, so I may have to get creative. I'm also not sure what the best way will be to keep the flywheel and pulley from re-rusting once I've cleaned them up. Oil? Paint? There is a plastic cowle to cover them up when I'm done. It's just not pictured.
Mike
Image2014 Ural M70 "Trogdor"
1987 Honda CMX250C "Rebel"
1979 Puch Moped "Wasp"
1971 Honda SL100

User avatar
GHGoodwin
Hero of the Soviet Union - 2020
Hero of the Soviet Union - 2020
Posts: 5348
Joined: Sun Jul 15, 2012 5:43 pm
Location: Aurora, Ohio 44202 (SE of Cleve)

Re: Fixing up an old air compressor.

Post by GHGoodwin » Tue Mar 06, 2018 8:00 am

I'd pull the big plug by the drain and inspect the inside of the tank. If its really rusty, or you can see rust flakes, I'd can the project. Air tanks are like any other pressure tank - dangerous when in bad shape.

When you get it back together barricade it behind something sturdy and run it up to over 150#. Pull the plug and walk away for a couple of hours. If the pressure holds pull the release valve and enjoy your new toy.

Safety first. Always.
Hal

2011/12 Tourist - "The Russian"
It's a long list.
2014 Patrol - "Blackbird"

User avatar
Tin Man
Commissar
Commissar
Posts: 10563
Joined: Mon Nov 19, 2007 2:15 am
Location: Johnson County, Texas, USA

Re: Fixing up an old air compressor.

Post by Tin Man » Tue Mar 06, 2018 9:05 am

Replacing the worn/damaged parts ain't the issue.......as has been said, the (18 year old) tank is gonna be the weak link. Before spending any money on parts, I'd do the pressure test.
Mike
2007 GearUp (Arctic #1)
130/45 jets, KTM rock solid mirrors, Delaware Dave's outstanding trunk lock, Mr. Cob's most excellent skid plate, Cycra Probend smashproof hand guards, Duro strong like bull 307's, RotoPax damn near bulletproof fuel cans, MKIII all but water proof air box and Dimples super duper magnetic drain plugs all around...oh yeah, and a manual fuel petcock.

.........if you see something that needs doing, just do it........

User avatar
Emoore
Order of Lenin
Order of Lenin
Posts: 1205
Joined: Sat Dec 31, 2016 1:13 pm

Re: Fixing up an old air compressor.

Post by Emoore » Tue Mar 06, 2018 10:13 am

Agreed with the others. Saw one of those blow in a friend's garage. Took out a good section of his car. Made a noise so loud people 2 blocks away called the police about an explosion.


Sent from my Moto G Play using Tapatalk
Ernest
2012 Ural T Olive (Roulette)
2011 Patrol (OTTO)
Yamaha FZ07 ( My need for speed )

Wake Forest, NC

John Wayne - Life's Hard. It's Even Harder When You're Stupid.

User avatar
Lmo
Hero of the Soviet Union - 2020
Hero of the Soviet Union - 2020
Posts: 5432
Joined: Wed Jun 10, 2015 3:19 pm
Location: Pismo Beach via So. Indiana

Re: Fixing up an old air compressor.

Post by Lmo » Tue Mar 06, 2018 12:01 pm

Scrap it

jump to 1:30
Lew Morris
Dnepr w/ '06 Ural Drive Train
C5 Power Arc
125/42 jets
Drilled slides/
.030" shims

1973 BMW R75/5 (original owner)
1947 HD FL (long gone, forever regretful)

Stryker
Hero of the Soviet Union - 2020
Hero of the Soviet Union - 2020
Posts: 241
Joined: Sat Dec 10, 2016 9:49 pm
Location: Columbia,CT

Re: Fixing up an old air compressor.

Post by Stryker » Tue Mar 06, 2018 1:43 pm

Pressurized air vessels are nothing to mess with. Years ago I ran an wrecking yard in the North end of Hartford CT. We had a customer with a small repair shop on North Main. An older gas station 2 bay all cement block construction. He had a 20 HP compressor hooked up to 2 100 gallon tanks. One night someone forgot to turn the compressor off. Well apparently that night the pressure switch failed. The tanks exploded and completely leveled the building.
2016 GU Sportsman
1968 Ducati 250 Scrambler (long gone)

rivers
Hero of the Soviet Union - 2020
Hero of the Soviet Union - 2020
Posts: 9668
Joined: Sat Jul 24, 2010 10:04 pm
Location: 48*N, 122*W

Re: Fixing up an old air compressor.

Post by rivers » Tue Mar 06, 2018 2:27 pm

Might not be a bad idea to have the tank sonic tested.
Joe
014 GU
"I'm lost but I'm making good time."

User avatar
Emoore
Order of Lenin
Order of Lenin
Posts: 1205
Joined: Sat Dec 31, 2016 1:13 pm

Re: RE: Re: Fixing up an old air compressor.

Post by Emoore » Tue Mar 06, 2018 3:43 pm

rivers wrote:Might not be a bad idea to have the tank sonic tested.
That would cost more than a new one.....

Sent from my Moto G Play using Tapatalk
Ernest
2012 Ural T Olive (Roulette)
2011 Patrol (OTTO)
Yamaha FZ07 ( My need for speed )

Wake Forest, NC

John Wayne - Life's Hard. It's Even Harder When You're Stupid.

User avatar
Lmo
Hero of the Soviet Union - 2020
Hero of the Soviet Union - 2020
Posts: 5432
Joined: Wed Jun 10, 2015 3:19 pm
Location: Pismo Beach via So. Indiana

Re: Fixing up an old air compressor.

Post by Lmo » Tue Mar 06, 2018 4:30 pm

Alternatively... pick up a new tank from someone like Graingers. Still not cheap considering having to rebuild the pump.
Lew Morris
Dnepr w/ '06 Ural Drive Train
C5 Power Arc
125/42 jets
Drilled slides/
.030" shims

1973 BMW R75/5 (original owner)
1947 HD FL (long gone, forever regretful)

User avatar
Bilgekeeldave
Commissar
Commissar
Posts: 3625
Joined: Thu Jul 19, 2007 12:04 pm
Location: Western Washington

Re: Fixing up an old air compressor.

Post by Bilgekeeldave » Tue Mar 06, 2018 4:56 pm

You could have a look inside with an inspection camera, if it looks good, use it.
Dave

RAMCO-Dnepr MT-16

User avatar
Emoore
Order of Lenin
Order of Lenin
Posts: 1205
Joined: Sat Dec 31, 2016 1:13 pm

Re: Fixing up an old air compressor.

Post by Emoore » Tue Mar 06, 2018 5:02 pm

Danger Will Robinson, Danger!!Image

Sent from my Moto G Play using Tapatalk
Ernest
2012 Ural T Olive (Roulette)
2011 Patrol (OTTO)
Yamaha FZ07 ( My need for speed )

Wake Forest, NC

John Wayne - Life's Hard. It's Even Harder When You're Stupid.

Michal
Comrade General
Comrade General
Posts: 597
Joined: Tue Oct 05, 2010 7:29 am
Location: Czech Republic, Europe

Re: Fixing up an old air compressor.

Post by Michal » Tue Mar 06, 2018 5:36 pm

That long chain of fittings will break when you accidentally touch the pressure switch less gentle. I've seen that happen.
The should be air line from compressor to relief valve in the switch. There is something like that in the picture, make sure that it works. The switch blows pressure from compressor (not from tank) when switched off. The reason is that compressor has no load during spin up. Otherwise it's too heavy load for motor to spin up. If it does anyway, the strain will take effect.
By my deeds I honor him, flat twin.
Михаил
2002 Днепр 650 Молодежный Чоппер (КМЗ-8.157.022)
2005 Урал 750 Спортсман (2WD)

User avatar
rebelrider
Order of Lenin
Order of Lenin
Posts: 1101
Joined: Tue Sep 04, 2012 5:03 am
Location: Shelton, WA

Re: Fixing up an old air compressor.

Post by rebelrider » Wed Mar 07, 2018 8:23 am

I have a cheap borescope I'll try to get into the tank. If I can capture some good stills or video, I'll share it. I'm finding a lot of parts at Home Depot and eBay. I haven't been able to find and owner's manual yet. Not sure how much oil a pump like this takes. Also, I'm seeing a lot of red stuff on the various threads. Is there a sealer that is better to use than teflon tape?
Mike
Image2014 Ural M70 "Trogdor"
1987 Honda CMX250C "Rebel"
1979 Puch Moped "Wasp"
1971 Honda SL100

hotflash44
Order of Suvarov
Order of Suvarov
Posts: 4677
Joined: Mon Mar 13, 2017 7:03 pm

Re: Fixing up an old air compressor.

Post by hotflash44 » Wed Mar 07, 2018 10:56 am

bottom line for all compressed air tanks is always bleed off the tank. or the moisture will eat it out from the inside and make the wall unsafe.i would use the cheap bore snake camera that's available on eBay for $10 bucks and hooks to your smart phone, you will probably see much surface rust that should be normal IMHO, but no gouges,deep indentations etc. just to be safe i wouldn't fill to max pressure 125 lbs should work for most stuff,it should have a working shut off and a dial that you can use to set max pressure. if questionable condition and you decide to use my suggestion would keep it at 100lbs rather than 125. :cheers:
2016 gear up asphalt grey, name Seryy Medved ,Air America CIA circa 1967/8 Vung Tau Viet Nam USS Tutuila ARG-4 (AND JUST A TOUCH OF AGENT ORANGE!)

User avatar
Lmo
Hero of the Soviet Union - 2020
Hero of the Soviet Union - 2020
Posts: 5432
Joined: Wed Jun 10, 2015 3:19 pm
Location: Pismo Beach via So. Indiana

Re: Fixing up an old air compressor.

Post by Lmo » Wed Mar 07, 2018 12:01 pm

Regardless, @ 5.8 SCFM @ 90psi, it's not going to be running grinders and the like without running continuously.
Lew Morris
Dnepr w/ '06 Ural Drive Train
C5 Power Arc
125/42 jets
Drilled slides/
.030" shims

1973 BMW R75/5 (original owner)
1947 HD FL (long gone, forever regretful)

Post Reply