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Ingersoll Rand G85 Compressor


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  #1  
Old 08-19-2016, 01:12:16 PM
Tracy T Tracy T is offline
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Question Ingersoll Rand G85 Compressor

I hate to start a new thread but I am working on the compressor end now and some of these came with different engines. I found the oil filter for the compressor but where do you check the level, drain it and refill? Tag on it says 10wt and approximately 4&1\2 gallons. It's got to have a drain and fill somewhere. But where? it looks like it has a oil cooler as well. I have looked online for a manual but no luck thus far. I really want to make sure the compressor is full of oil before I try to start it!
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Old 08-19-2016, 05:20:07 PM
Ed Bezanson Ed Bezanson is offline
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Default Re: Ingersoll Rand g85 compressor

Dear Tracy We love all new threads so don't hesitate when you need help. Im sure someone on here may be able to help on your questions. It would be very helpful if you gave more information on your g85. How big is it, what size engine powers it, how old is it and last but not least a picture of the unit in question. Good luck Ed B
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Old 08-19-2016, 05:32:06 PM
Tracy T Tracy T is offline
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Default Re: Ingersoll Rand g85 compressor

Power plant IH c135 47 HP compressor is 85 cubic ft min, as for age no clue. Pictures coming in a few minutes.I found the oil resivor it's in the air tank (double wall tank). Gauge is shot.
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Old 08-19-2016, 05:39:57 PM
Tracy T Tracy T is offline
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Default Re: Ingersoll Rand g85 compressor

Here is pics....
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Old 08-19-2016, 05:41:03 PM
Tracy T Tracy T is offline
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Default Re: Ingersoll Rand g85 compressor

Another...
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Old 08-20-2016, 09:12:01 PM
Tracy T Tracy T is offline
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Default Re: Ingersoll Rand g85 compressor

Well digging around the net yielded no results and it looks like nobody here knows much about this unit either so I decided to dive right in. It turns out that it's not a double wall tank. It was about 3 gallons overfull on compressor oil and built like a WWII tank! I will keep you guys posted and I will have to get my wife to take pictures along the way, I can do it on the desktop but it is down for the count, and learning how on this tablet is going to take some time.
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Old 08-20-2016, 09:39:12 PM
s100 s100 is offline
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Default Re: Ingersoll Rand g85 compressor

That compressor is a rotary vane, if it's like my older I-R 85 was. It works sort of like a refrigerant system, with the oil circulating around in the air system, because there's no crankcase to these and the works are all in the air stream. The oil circulates around the compressor then falls to the bottom of the receiver, which as you have discovered acts as a de facto oil tank. The oil is 10W but it's not just any old oil. You need to use R&O (rust and oxidation) preventative hydraulic oil in the thing. And once you get it running don't be tempted to be nice to the engine by manually holding the throttle at slow idle to let the engine warm up. This will stave the compressor end for oil and it will quickly start making some clattering noises, then eventually it will stop, which is even worse. Let the governor control the engine speed, unless of course it is out of adjustment and wants to let the engine overspeed.

I'm no expert on these things, just picked up bits here and there using the things over the years (although I have more experience with Chicago Pneumatics). So some odd bits of what I said my not be right. This is right, though. That's a fairly new compressor. Contact your local I-R construction products distributor to get the real good goods. You should be able to get a manual and whatever else you need. If you can't find an I-R dealer, check your local rental yards or maybe contractors and lawn sprinkler companies. they may well have similar compressors and can guide you to the correct dealer.

Good luck, and sorry I could not be more specific.
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Old 08-20-2016, 09:41:03 PM
Glenn Gieszler Glenn Gieszler is offline
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Default Re: Ingersoll Rand g85 compressor

I have the manuals for a D85 which is piston type compressor vs the rotary in yours so that is of no use, this sales literature is of the GRR 85 try searching that it should be close to yours it looks to be 1970 vintage
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Old 08-20-2016, 09:49:01 PM
Glenn Gieszler Glenn Gieszler is offline
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Default Re: Ingersoll Rand g85 compressor

The g apparently is for gyro-flo this picture shows the oil flow
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Old 08-20-2016, 09:55:27 PM
Glenn Gieszler Glenn Gieszler is offline
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Default Re: Ingersoll Rand g85 compressor

This is a picture of the rotary compressor
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Old 08-20-2016, 09:59:34 PM
Ed Bezanson Ed Bezanson is offline
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Default Re: Ingersoll Rand g85 compressor

I told you someone would know about your compressor. The rest will be much easier. Ed B
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Old 08-21-2016, 07:59:51 AM
Tracy T Tracy T is offline
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Default Re: Ingersoll Rand g85 compressor

Thanks guys for what information you have given me, looks like a giant air motor inside! The biggest reason I tore into it was the overfull condition. I was afraid the oil separator may be bad and from what I have heard is $$$$$$. After opening it up I have a better understanding of how it works along with the pictures you all provided. I have come to the conclusion that it was overfilled because the gauge lens was so messed up you couldn't read the level, for that matter I couldn't even tell what kind of gauge it was until I removed the lens! I believe I may very well have a good compressor with a little TLC. The oil that I drained out was clean with no evidence of any moisture. It's good to know it uses R&O oil and also not to let the motor run to slow to avoid oil starvation to the compressor. I have had the carburetor soaking all night and at this point that may be my only setback, I will have to order a kit which is a shame all I will need is two gaskets.
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Old 08-21-2016, 08:07:32 AM
oldgoat 47 oldgoat 47 is offline
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Default Re: Ingersoll Rand g85 compressor

Might be a good idea to check the state of the vane tips before you start it. If you lift the intake assembly off and inch it over you can see their condition. The rotor slots should be rounded both leading and trailing edges if they are razor sharp round them off with a stone. Also I can't see any minimum pressure valve on it don't run it with less than 50 psi or the compressor oil pump will starve and it will blow oil through your outlet.
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Old 08-21-2016, 08:39:27 AM
Tracy T Tracy T is offline
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Default Re: Ingersoll Rand g85 compressor

My plan was to start it with the main air valve open, then close it and see if it builds pressure and governs back to I think it says 1100 rpm. It needs a fair amount of work but I am not going to spend much on it until I see what I have. Engine manifold needs replaced, needs a couple pushrods, muffler, etc. One odd thing I haven't seen before is it has a small rust hole in the head on one of the exhaust ports, thinking I can use a brass rod and weld that right up.

---------- Post added at 08:39:27 AM ---------- Previous post was at 08:24:32 AM ----------

One more question, this unit has a hour meter on it and looks to be original. I have no idea if it works at this point but it is showing just over 2000 hours. How many hours are one of these good for if taken care of? This unit belonged to a town crew,and from what I see looks to have been maintained. It has had the head off sometime in its life, looks like they had it off for a valve job.the man I bought it from bought it from the town at auction.
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Old 08-21-2016, 09:47:11 AM
Tracy T Tracy T is offline
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Default Re: Ingersoll Rand g85 compressor

Finally found a date, on the receiver tank dated 1973. Same age as me.
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Old 08-22-2016, 07:22:39 AM
oldgoat 47 oldgoat 47 is offline
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Default Re: Ingersoll Rand g85 compressor

Got 4000 hrs out of a 600cfm gyroflo vanes and did the oilseal at the same time. Start it with the main air valve closed then open it a little if it wants to stall.
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Old 08-22-2016, 03:11:41 PM
Tracy T Tracy T is offline
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Default Re: Ingersoll Rand g85 compressor

Ok another question regarding the oil separator, there is two round gaskets where it bolts into the end of the tank with 8 bolts. I damaged both when I took it out, are these gaskets any special material? I have cut two out of gasket paper so I can fire this thing up tomorrow when my distributor gears get here.
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Old 08-23-2016, 07:09:44 PM
Tracy T Tracy T is offline
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Default Re: Ingersoll Rand g85 compressor

Here it is running!


https://youtu.be/uMhkvegnOA4

---------- Post added at 07:09:44 PM ---------- Previous post was at 07:01:12 PM ----------

Sorry guys and gals, let try this again...here is the video!


https://youtu.be/CVxCvYhYqs0
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Old 08-02-2018, 04:25:25 PM
Tracy T Tracy T is offline
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Default Re: Ingersoll Rand g85 compressor

its been a while but i ran into what i thought was serious issues on the airend! it had the symptoms described in this thread and just quit making any air. i dove into it and low and behold i found the weak link! These have a split taper lock that couples the engine to the compressor, it is the thinnest i have ever seen. well after 45 years of service it let go, IR does not support something this old and if i can not locate the parts i will have a good c135 engine and a good g85 compressor but no way to couple the pair.
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Old 08-03-2018, 05:16:26 PM
Tracy T Tracy T is offline
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Default Re: Ingersoll Rand g85 compressor

i think i found the part at mcmaster-Carr. it should be here tuesday.
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