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Old 09-23-2015, 04:25 PM   #1
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Oil leak from compressor?

While crawling around under the Berkshire today, I noticed the bottom of the (compressor? Dryer?) appeared to have a slow leak. This was a real grimy, sludgy oil. Real hard to tell where it's coming from. I do see a spot on the ground where it's been dripping.

1. Is this the compressor? Dryer? Something else?
2. Any ideas what might be leaking, or a good way to troubleshoot? Click image for larger version

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Old 09-23-2015, 06:07 PM   #2
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Quote:
Originally Posted by chesterhull View Post
While crawling around under the Berkshire today, I noticed the bottom of the (compressor? Dryer?) appeared to have a slow leak. This was a real grimy, sludgy oil. Real hard to tell where it's coming from. I do see a spot on the ground where it's been dripping.

1. Is this the compressor? Dryer? Something else?
2. Any ideas what might be leaking, or a good way to troubleshoot? Attachment 89683Attachment 89684


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Don't know what it is, but I'm almost certain is is not the compressor.

When I drove semi, I looked at the compressor almost every day (as part of pre-trip inspection) and I've never seen one that looks like what's in your pic.

Boowho??
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Old 09-23-2015, 06:11 PM   #3
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it is the air dryer. have had to replace them on my semi before
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Old 09-23-2015, 06:13 PM   #4
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it is after compressor and air tanks to help get water or oil out before it gets in the whole air system
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Old 09-23-2015, 06:15 PM   #5
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Hard to tell from the picture but looks like the air dryer. I do not look at mine to often. Is it on the drivers side? if yes it is air dryer. The air dryer will bleed air. The cartage is supposed to be changed every three years. It builds up a black/gray sludge if not changed and this can push into break air lines.
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Old 09-23-2015, 06:16 PM   #6
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Ok, thanks for that. So it does appear that the oil residue may be coming from the bottom drain, and just be blowing up on the components. Is that normal?
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Old 09-23-2015, 06:23 PM   #7
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Silver, it is on the drivers side, so thanks for the confirmation. What is that called...a "dryer cartridge"?
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Old 09-23-2015, 09:22 PM   #8
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See attached. Easy to change just a PIA to get to for a big guy like me. I forget if it was $140 or $240
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Old 09-24-2015, 06:19 AM   #9
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Thanks a lot for the info!


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Old 09-24-2015, 08:15 PM   #10
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Looks like a combination of oil and water discharge. Is this a new unit or an older one. The oil will come from the compressor. If the cartridge is too contaminated you will need to have it replaced as it will not seperate water properly any more. When you drain your air tanks put a clean cloth over the drain and see if you are getting oil out of the tanks as well. Oil in the air system will harm seals in the brake system. Take the discharge line off at the compressor ( engine off) and wipe the inside of the pipe with a clean white cloth or q tip, if there is oil in the pipe then it could be time for a compressor.
Been a diesel mechanic since 1972 and driving trucks since 1984.
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