Rybisp Posted October 28, 2022 Share Posted October 28, 2022 2003 RD 688 with Mack E7 motor. Air compressor bolts backed out started pouring engine oil, torqued them back down a few weeks later same thing. Replaced bolts and used locktite on them. Now breaks the head off the bolt. Anyone ever have this problem? If so what was your remedy that solved the issue? Thanks! Quote Link to comment https://www.bigmacktrucks.com/topic/70627-air-compressor-bolts/ Share on other sites More sharing options...
Onyx610 Posted October 28, 2022 Share Posted October 28, 2022 Got to ask, any previous work done to the compressor or aux shaft before this? Quote Link to comment https://www.bigmacktrucks.com/topic/70627-air-compressor-bolts/#findComment-513795 Share on other sites More sharing options...
mrsmackpaul Posted October 28, 2022 Share Posted October 28, 2022 Sounds like something is spaced correctly Not knowing anything about these but I gather it drives off a accessory drive Paul Quote Link to comment https://www.bigmacktrucks.com/topic/70627-air-compressor-bolts/#findComment-513802 Share on other sites More sharing options...
Joey Mack Posted October 28, 2022 Share Posted October 28, 2022 Is the coupler pressed on far enough. Are you using grade 10.9 metrics? Quote Link to comment https://www.bigmacktrucks.com/topic/70627-air-compressor-bolts/#findComment-513805 Share on other sites More sharing options...
Popular Post Vmac3 Posted October 28, 2022 Popular Post Share Posted October 28, 2022 Is the auxiliary shaft walking back and forth? 1 2 Quote Link to comment https://www.bigmacktrucks.com/topic/70627-air-compressor-bolts/#findComment-513816 Share on other sites More sharing options...
Joey Mack Posted October 28, 2022 Share Posted October 28, 2022 You reckon oil pressure would fluctuate with a sloppy aux shaft? Good thought "V".... Quote Link to comment https://www.bigmacktrucks.com/topic/70627-air-compressor-bolts/#findComment-513817 Share on other sites More sharing options...
Vmac3 Posted October 29, 2022 Share Posted October 29, 2022 I think you would. It was a shot in the dark. Maybe a bad vibration damper. V 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70627-air-compressor-bolts/#findComment-513971 Share on other sites More sharing options...
fjh Posted October 29, 2022 Share Posted October 29, 2022 1 hour ago, Vmac3 said: I think you would. It was a shot in the dark. Maybe a bad vibration damper. V we have seen the shafts break another long shot ! This shaft may have a crack and still driving! also the drive coupling could be worn! Quote Link to comment https://www.bigmacktrucks.com/topic/70627-air-compressor-bolts/#findComment-513981 Share on other sites More sharing options...
Joey Mack Posted October 29, 2022 Share Posted October 29, 2022 this is a strange one.. if SAE bolts are used, that will be an issue.. the threads are 16mm metric.. the bolt grade is supposed to be 10.9 Quote Link to comment https://www.bigmacktrucks.com/topic/70627-air-compressor-bolts/#findComment-513988 Share on other sites More sharing options...
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