I bought a used compressor and intend to change out the oil and install a
HTF auto tank drain on it. The air pump does not have a dipstick or sight
glass on it. Since the oil bung was in a tough location, most of the old
oil ended up on the floor and could not be replaced with a similar volume.
The pump is a Vee twin or four cylinder (thought is was a two, but the heads
have a "8"-ish shape to them.. Pics are posted on
alt.binaries.pictures.woodworking). Can anyone recommend an oil level
relative to the crank or other point? Also, where can I learn more about
this machine.. The 60?gal tank has a welded tag identifying it a 1956 John
Wood of Conshohocken Penna. The motor is a 3 hp single phase AJAX, and this
bad boy weighs in at about 400#.
Only 400#'s??? No dip stick, or sight glass? Could the sight glass have
been painted over? Is the fill hole vertical or does it face up? Typically
vertical/fill locations are filled until the oil begins to pour out.
The fill is top dead center between the cylinders. Mike hit it right on the
nose. There is a painted-over sight glass behind the ball valve in the
picture (held in by six really good sized bolts!). A little lacquer thinner
cleared her right up. There is no gradation on it, so I'd presume that
center of the sight glass is ideal? That would put the oil level even with
the lower edge of the crankshaft diameter.
I'm guessing at the 400# number... I loaded it into a tilt trailer with a
winch and took it out with a backhoe. Good thing about a bad back, you don't
try the impossible anymore:)
Thanks gents, any more advice about the care and feeding of these old
Not a 4 cylinder - 2. Can't tell if it's a single stage or a two stage, but
with what looks like both cylinders being the same size and the manner in
which it's plumbed (air intakes), I'd guess two cylinder single stage. It
looks like there is a site window behind the green valve handle. That round
thing. It may be painted over by the looks of it. See if you can clean
some of the blue paint off of the center of it. I'll bet you find a site
window under there.
I doubt that but that seems as likely as a single cylinder and piston under
each head. I'm not an expert buy have replaced the reed valves on a
compressor and it is quite common for a rectangular exterior cylender to
have 2 cylenders.
I was wondering if Mile had some kind of knowledge of there being retangular
cylendars with 1 piston and cylinder in each. This being an old compressor
I guess there could be the possibility that there are a couple of actual
valves in the cylinder that would occupy the rest of the space similar to
old lawn mower engines, flat head V-8s.
To be fair, there was nothing inherently wrong with your assumption. I knew
that my compressor was a double cylinder in a single bank but until I pulled
the head and reed valve plate off it was difficult to understand how all
that worked in there. Not totally unlike some 2 stroke engine where the
intake air path is not as direct as one might think.
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