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Old 08-10-2016, 09:41 PM   #1
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1988 34.5' Airstream 345
Ham Lake , Minnesota
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1988 345 classic MH Air Compressor

Last week my air gauge was stuck at 50psi after the engine had been running for more than 5 minutes. I was concerned that I may need to replace my compressor.

I thought about things for a couple of days, then decided to take a look at the compressor to see if it had an air filter.


There is something that looks like a tiny little filter. I unscrewed the filter.


To see if it was plugged I blew through it, backwards. It seemed to allow air to pass. Then I put it back on and turned on the ignition. Within a minute I had added 10psi to the gauge.

I got to thinking and decided that the quick fix was probably not going to last. I could not find parts for the Gast compressor with my Google searches, so I tried taking the old filter apart. The cap came off without damage using a flat blade screwdriver. The filter is just felt washers with an oily feel, and they were quite dirty with black spots where the four holes in the cover were. I washed the felt washers and blotted them dry two days ago and let them dry until tonight.


I decided to put a very light spray of K&N filter oil on one of the washers, then squeezed them together to transfer the oil between them. The oiled sides were facing each other when I reassembled.

Oddly there seems to be more back pressure when I blow through the filter now. I put the filter back on the compressor and gave it a try. It took a while with a lot of jumping of the needle, but the pressure did start to increase and after a few minutes run time the back bumper is now 1" higher than when I started. Maybe I should have left well enough alone, or not added the filter oil.

I'm camping this weekend so we'll see if the rear suspension is able to stay aired up on the road.
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Old 08-11-2016, 06:53 AM   #2
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That filter looks real similar to my Viair filter. You may want to see if they are interchangeable.

Mike
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Old 08-11-2016, 07:06 AM   #3
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Old 08-11-2016, 07:08 AM   #4
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Richmond , Kentucky
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Those filters are generic filters that you can buy from various tool outlets or equipment dealers. I think the last ones I bought were from the Surplus Center in Lincoln Nebraska.

Here's one from Amazon, Threaded Intake Filter.

Brad
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Old 08-11-2016, 10:22 AM   #5
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Paul and Tam, good info. I had the same problem last week, nothing past about 50psi and my rear bags just wouldn't quite get up.. compressor was running and running with no apparent leaks. I just purchased an new Viair unit and will be installing this week. Yep, it has a filter as my old on did not. Keep us posted.
Go Ham Lake! I'm a Duluthian.

Ben
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Old 08-11-2016, 04:56 PM   #6
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1988 34.5' Airstream 345
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Thanks for the suggested replacement filter. We made it to el Rancho Manana just fine. The gauge started the day at about 60psi, just where it was last night, then quickly reached the normal 105-110 psi and stayed there the entire trip.

Duluth? We are thinking about going to Silver Creek next weekend.
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Old 08-12-2016, 07:01 AM   #7
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I should have added, the filter I provided a link to may or may not be the right thread size. Check the thread size on your original filter before ordering a replacement.
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Old 08-15-2016, 12:00 PM   #8
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I think the threads on my Gast compressor inlet are 1/4" PT. I will update this thread when the part arrives and I confirm it fits.
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