nam vet Posted September 12, 2023 Share Posted September 12, 2023 When I drain my air tanks I am getting oil mixed in with the water/air. Its a fair amount and if I leave the petcocks open it will drip small amounts of oil for a day or so. I am thinking the air compressor is bad. Am I on the right track? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73294-oil-in-the-air-tanks/ Share on other sites More sharing options...
tjc transport Posted September 12, 2023 Share Posted September 12, 2023 that would be my first suspect. Quote when you are up to your armpits in alligators, it is hard to remember you only came in to drain the swamp.. Link to comment https://www.bigmacktrucks.com/topic/73294-oil-in-the-air-tanks/#findComment-538723 Share on other sites More sharing options...
doubleclutchinweasel Posted September 12, 2023 Share Posted September 12, 2023 Probably. But, look this over. Start down at about page 19-20. Gives some items to check. bendix-tu-flo-400-500-1000-air-compressor-user-manual.pdf Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/73294-oil-in-the-air-tanks/#findComment-538725 Share on other sites More sharing options...
Freightrain Posted September 12, 2023 Share Posted September 12, 2023 Yup. Mine used to make milkshakes every trip out. Got it rebuilt about 17 yrs ago. Been good ever since. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/73294-oil-in-the-air-tanks/#findComment-538738 Share on other sites More sharing options...
tjc transport Posted September 12, 2023 Share Posted September 12, 2023 my Granite use dot do that too..... until it snapped a connecting rod in the compressor and punched a two inch hole in the side of the compressor directly opposite the oil tube pumping 4 gallons out of the engine. 2 Quote when you are up to your armpits in alligators, it is hard to remember you only came in to drain the swamp.. Link to comment https://www.bigmacktrucks.com/topic/73294-oil-in-the-air-tanks/#findComment-538744 Share on other sites More sharing options...
nam vet Posted October 3, 2023 Author Share Posted October 3, 2023 I am installing a used/rebuilt air compressor on my "B" with a 673. The compressor came of a running engine and already has oil circulated thru it {not self lubricating}. Do I need to add any more oil or will the engine oil fill it fast enough when I start the engine B4 there is any compressor damage? Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/73294-oil-in-the-air-tanks/#findComment-539637 Share on other sites More sharing options...
Geoff Weeks Posted October 3, 2023 Share Posted October 3, 2023 Just put on and fire it up. It doesn't fill with oil, oil is pressureized into the crank, which lubes the rod and mains , oil then drains back to the engine sump. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73294-oil-in-the-air-tanks/#findComment-539638 Share on other sites More sharing options...
Popular Post doubleclutchinweasel Posted October 3, 2023 Popular Post Share Posted October 3, 2023 (edited) Some (all?) of those have a small oil feed tube in the front of the air compressor crank that has a tendency to fall out when the pump is removed. If this one has the tube, be sure it is in place at installation, or you may not get lubrication to the compressor. Edited October 3, 2023 by doubleclutchinweasel 3 1 Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/73294-oil-in-the-air-tanks/#findComment-539655 Share on other sites More sharing options...
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