Sears Craftsman Air Compressor Repair

Sears Air Compressor

Today we’re going to take a look at this old craftsman air compressor I’ve had this

thing for close to 20 years now and it’s worked trouble-free up until now the

problem I’m having with it is actually relatively minor I can still use it for

the most part but what seems to be happening is that it seems to be leaking

from somewhere here under the regulator cover now if I keep it at a low pressure

say around 50 or 60 or something like that where I’m just spilling up tires or

something like that with it it’s okay now it’s obviously still leaking at

those pressures but it’s not as noticeable if I crank it up higher to

run something like say an impact wrench or something like that you can really

start to hear it hiss from under the cover here so let’s pull this cover off

and see what we’re dealing with hopefully it’s just a loose fitting or

something like that the first thing we’re going to do is loosen this plastic

lock screw that’s around the regulator adjustment knob you can see it’s knurl

and we should be able to grab this by hand just come back it off so with that

out of the way the cover should just lift off of here okay so I’ve got the

compressor all pressurized and I don’t know if you guys can hear it in the

camera or not but it is leaking a little bit let me crank up the regulator

pressure a little bit and then you can kind of hear what’s going on


okay so you can see that I’m up at maximum pressure and you may be able to

actually see the a little bit of teflon tape kind of flowing here and I can feel

it coming out right around here it almost feels like it’s coming out of the

bottom of this regulator adjuster so this may be the problem okay that being

loose is probably the root of the problem but also being plastic you

probably can’t tighten it up much more than what it is without breaking it so I

think what I’m going to do is let some of the pressure bleed off here and then

maybe we’ll pull this all the way off and see if there’s a way we can kind of

seal the threads on this a little bit better than what they are so I’ve got

the regulator off of the unit here I’m going to be careful because there’s a

lot going on here but I think I found the problem so you can see here there’s

sort of a needle valve type arrangement and of course this is all plastic but it

seems like it’s in decent shape I’m gonna put that back in where it goes

here next up we have a spring that goes up here and that is what can adjust the

tension of the regulator here and then on top of the outer part of the plastic

piece there there is this plastic washer that would normally be on there and you

may be able to see that I’ve only got part of it here and even that part of it

is cracked so I think this is the root of the problem this little washer here

that was kind of in that position has disintegrated okay so I think I’ve got a

couple of options here now what I could do is go on sears PartsDirect there’s

something like that and try and order the exact replacement or I could go down

to the hardware store and see if they have something that would work for this

application okay but what I think I’m gonna do to save myself a trip and some

time is to just put some our automotive RTV silicone in here and see if that’ll

kind of seal things up at least for now so you may be able to see that I’ve put

some plumbers teflon tape around the threads on the regulator base and what

that’ll do is that’ll help take up any gaps that have formed over time as this

plastic on the regulator housing has aged but as I said before I really think

the root of the problem is the fact that that washer or gasket

that goes on top of this rubber part has aged and cracked and disappeared so

we’re going to put a thin layer of this blue RTV silicone on there to kind of

take up that space now this is a tube of Permatex ultra blue that I’ve had for a long time

and haven’t opened up but it should still be fine so we’ll put a little bit

on there and see what happens so as you can see I’ve got a layer of the blue RTV

in there on the inside surface of the plastic housing so next up we’ll put

this piece back in and this is the piece that actually adjusts the pressure in

there and this kind of sits in the plastic knob and the plastic knob is

really there to just kind of give you the leverage to be able to kind of turn

this thing so we’ll drop that in place next up I’ll drop this piece on and you

can see this is a combination of sort of a plastic needle valve and kind of a

rubber diaphragm around the outside and we’ll drop that in place and that sort

of allows this thing to kind of move up and down and control the air flow

through the regulator next up we’ll bring the spring back and put that on

top of here and kind of seat it down into those grooves and then we’ll bring

the plastic body back and just screw it down on top of everything here and then

we’ll just kind of push down on this thing and try and get the threads

started so now what I’ll do is I’ll tighten this up as much as I can by hand

now that I’ve got this tightened up as much as I could by hand I’m going to

take this pair of crescent pliers and just kind of tighten it just ever so

slightly more just to make sure it makes a good seal we don’t want to tighten it too much

otherwise this plastic could crack so as you can see I’ve got everything back

together here what I’m going to do is let this sit for a little while so that

the silicone will cure and then we’ll bring this thing up to pressure and see

if everything is working as expected okay so it’s been about six hours since

I put the silicone on here normally I’d like to let this sit for 12 or maybe

even 24 hours before putting any pressure on it but

I need to use the compressor so we’re going to take our chances and see what

happens okay so as you can see I’ve got the pressure up to about 90 95 or so

I’ve got the regulator up to maximum and there doesn’t seem to be any leaking so

I think the problem is solved the last thing to do is put the cover back on

okay so now we’ll just put this thumb screw back on and it should be good to

go okay that’s pretty much gonna wrap things up for the repair of this old craftsman air compressor.


Source : Sears Craftsman Air Compressor Repair

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