Dalton1 Posted January 13, 2023 Share Posted January 13, 2023 I have a 07 CV713 with an AI400 and about 15k miles ago i had the number 6 (rear most) EUP get pushed out of the block breaking both bolts holding it in flush with the block. Got both bolts out installed a new EUP and hardware from mack and torqued to spec. Then tonight had the exact same thing happen on the same cylinder again. Anyone have any idea what would cause this to happen? Haven't had issues with any of the other cylinders, all the heat shields are in place. Quote Link to comment https://www.bigmacktrucks.com/topic/71038-eup-problem/ Share on other sites More sharing options...
Onyx610 Posted January 13, 2023 Share Posted January 13, 2023 Check out the roller on it and see what it’s looking like. Quote Link to comment https://www.bigmacktrucks.com/topic/71038-eup-problem/#findComment-521122 Share on other sites More sharing options...
Dalton1 Posted January 13, 2023 Author Share Posted January 13, 2023 Pulled the roller and it looks ok to me, what do you think? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/71038-eup-problem/#findComment-521141 Share on other sites More sharing options...
Mackpro Posted January 13, 2023 Share Posted January 13, 2023 Screw in new bolt down in the hole to about the depth it normally rest. See if you can wiggle the bolt in the threads. Quote Link to comment https://www.bigmacktrucks.com/topic/71038-eup-problem/#findComment-521143 Share on other sites More sharing options...
Mackpro Posted January 13, 2023 Share Posted January 13, 2023 Roller looks perfect 1 Quote Link to comment https://www.bigmacktrucks.com/topic/71038-eup-problem/#findComment-521144 Share on other sites More sharing options...
Mackpro Posted January 13, 2023 Share Posted January 13, 2023 For some reason # 5 or # 6 was always the location this happened at Quote Link to comment https://www.bigmacktrucks.com/topic/71038-eup-problem/#findComment-521145 Share on other sites More sharing options...
Onyx610 Posted January 13, 2023 Share Posted January 13, 2023 Yea I was wondering about the threads too Quote Link to comment https://www.bigmacktrucks.com/topic/71038-eup-problem/#findComment-521147 Share on other sites More sharing options...
Dalton1 Posted January 13, 2023 Author Share Posted January 13, 2023 I will check the threads when I get the bolts out, if they're loose what would you recommend? Helicoil? Quote Link to comment https://www.bigmacktrucks.com/topic/71038-eup-problem/#findComment-521150 Share on other sites More sharing options...
Popular Post Vmac3 Posted January 13, 2023 Popular Post Share Posted January 13, 2023 I've had EUP bolts break at #6 where the threads completely came out of the block. Tried Heli-Coils and it worked out. If the threads are very sloppy with new bolts, then I suggest repairing them with Heli-Coils. Make sure you torque the bolts down to 60lbsft. V 3 Quote Link to comment https://www.bigmacktrucks.com/topic/71038-eup-problem/#findComment-521151 Share on other sites More sharing options...
Joey Mack Posted January 13, 2023 Share Posted January 13, 2023 Thread size is 10mmx1.50... Quote Link to comment https://www.bigmacktrucks.com/topic/71038-eup-problem/#findComment-521154 Share on other sites More sharing options...
880joe Posted January 13, 2023 Share Posted January 13, 2023 Number 6 is the one that always breaks on me of course the hardest one to get to 1 Quote Link to comment https://www.bigmacktrucks.com/topic/71038-eup-problem/#findComment-521196 Share on other sites More sharing options...
Joey Mack Posted January 13, 2023 Share Posted January 13, 2023 It's true.. I have repaired 5+6 many times.. I recommend using new bolts. They are metric grade 10.9.. the final torque is 60 lbft.. I believe that was posted already.. take the bolts down evenly til snug, then 30ftlb on each then final torque.. Before you do any of this, get new o-ring kits, and use 320ish emery cloth to clean the chamfer at the top of the EUP bore. so the (pre-lubed) o-ring doesn't get cut going in... jojo Quote Link to comment https://www.bigmacktrucks.com/topic/71038-eup-problem/#findComment-521197 Share on other sites More sharing options...
fjh Posted January 14, 2023 Share Posted January 14, 2023 11 hours ago, Mackpro said: For some reason # 5 or # 6 was always the location this happened at Agree some weird reason 5-6 seen it lots! Quote Link to comment https://www.bigmacktrucks.com/topic/71038-eup-problem/#findComment-521209 Share on other sites More sharing options...
fjh Posted January 14, 2023 Share Posted January 14, 2023 3 hours ago, 880joe said: Number 6 is the one that always breaks on me of course the hardest one to get to On ac engine they are all not nice!specially the front! Ai are a cake walk! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/71038-eup-problem/#findComment-521211 Share on other sites More sharing options...
Dalton1 Posted January 14, 2023 Author Share Posted January 14, 2023 Thanks for all the advice, got it back together, had to helicoil one hole, the other seemed ok. Used new bolts and put a new EUP in. Is the EUP that blew out worth saving or just a core now? Looks ok but wasn't sure so i threw a new one in. Only has 15k on it. Quote Link to comment https://www.bigmacktrucks.com/topic/71038-eup-problem/#findComment-521215 Share on other sites More sharing options...
Joey Mack Posted January 14, 2023 Share Posted January 14, 2023 There should have been a core charge.. Quote Link to comment https://www.bigmacktrucks.com/topic/71038-eup-problem/#findComment-521237 Share on other sites More sharing options...
Dalton1 Posted January 14, 2023 Author Share Posted January 14, 2023 (edited) I had a new one on the shelf already that already had a core applied to it, guess I'll just use this one as a core towards the next. Edited January 14, 2023 by Dalton1 Grammar 1 Quote Link to comment https://www.bigmacktrucks.com/topic/71038-eup-problem/#findComment-521242 Share on other sites More sharing options...
Dalton1 Posted January 14, 2023 Author Share Posted January 14, 2023 Anyone have any ideas on how to help prevent this from happening again? Would putting heat wrap on the down pipe or turbo be worth it to help keep heat off of the EUPs? Quote Link to comment https://www.bigmacktrucks.com/topic/71038-eup-problem/#findComment-521244 Share on other sites More sharing options...
Joey Mack Posted January 14, 2023 Share Posted January 14, 2023 The original heat shields should be enough.. They also help keep 'crud' from building up on the EUP's and wires, which will hold heat in.. I am curious what ideas get posted.. Jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/71038-eup-problem/#findComment-521245 Share on other sites More sharing options...
fjh Posted January 14, 2023 Share Posted January 14, 2023 11 hours ago, Dalton1 said: Thanks for all the advice, got it back together, had to helicoil one hole, the other seemed ok. Used new bolts and put a new EUP in. Is the EUP that blew out worth saving or just a core now? Looks ok but wasn't sure so i threw a new one in. Only has 15k on it. Yup I have re used these many times as It usually entailed going on a rd side or up some dog trail to rescue ! you might also consider an oil change as there has likely been some fuel dilution as Joe mentioned also a core charge you should get the cal code installed at some point also not crucial but !!!!! just sayin! I believe it comes down to bolt quality how ever number 5 , 6 is a bit of an anomaly for sure! have seen others fail! just not as often! This also seems to happen to the AI More than the AC from my observation! This comes down to dollar store parts again! just like rocker bolts there were a rash of broken rocker bolts due to poor quality at one point! Aside from the fact the bolt size should have been one size up! under engineered! The origanal design e6 e9 all had 7/16 bolts and only ever seen one break once! why they went to a smaller bolt is kind of a mystery to me How EVER I can't even blame Volvo for this short coming! 🤣 Quote Link to comment https://www.bigmacktrucks.com/topic/71038-eup-problem/#findComment-521250 Share on other sites More sharing options...
Dalton1 Posted January 14, 2023 Author Share Posted January 14, 2023 Mine was almost done on the side of the road too, of course had the plow, wing and 12 yards of sand on at the bottom of a hill when it let go, luckily a guy with a shop up the road bailed me out and dragged it there with his backhoe. Good to know thanks, oil change will definitely get done, unfortunately I changed it not long ago and of course this truck has the 52 quart pan. Anyone ever tried to drill it out and make a 7/16 or m12 bolt work? Seems like there's plenty of meat on the block for that. I'd love to find a way where I don't have to worry about it, not totally confident in the helicoil. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/71038-eup-problem/#findComment-521271 Share on other sites More sharing options...
Joey Mack Posted January 14, 2023 Share Posted January 14, 2023 (edited) if you were to drill out the block for bigger bolts, you will also need to drill out the EUP's.. I think that would give more problems in the future, especially if you have to warranty an EUP.. And I can see the ears breaking off the EUP when you try to torque it down passed 60 lbft.. Maybe just check bolt torque here and there, and replace them annually if you really have a concern.. Another thing that helps, is to oil the bolts, and wipe them off so there is not enough to hydraulic lock them in the hole, only for them to relax and become loose.. jojo Edited January 14, 2023 by Joey Mack more content needed 1 Quote Link to comment https://www.bigmacktrucks.com/topic/71038-eup-problem/#findComment-521274 Share on other sites More sharing options...
fjh Posted January 14, 2023 Share Posted January 14, 2023 1 hour ago, Dalton1 said: Mine was almost done on the side of the road too, of course had the plow, wing and 12 yards of sand on at the bottom of a hill when it let go, luckily a guy with a shop up the road bailed me out and dragged it there with his backhoe. Good to know thanks, oil change will definitely get done, unfortunately I changed it not long ago and of course this truck has the 52 quart pan. Anyone ever tried to drill it out and make a 7/16 or m12 bolt work? Seems like there's plenty of meat on the block for that. I'd love to find a way where I don't have to worry about it, not totally confident in the helicoil. BIG PAN ! Before you waste money on an oil change get a sample done it maybe you can get by till your next service! a small amount of fuel will not hamper things much! 2 Quote Link to comment https://www.bigmacktrucks.com/topic/71038-eup-problem/#findComment-521275 Share on other sites More sharing options...
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