Joey Mack Posted May 8, 2022 Share Posted May 8, 2022 I beleive the runout procedure came from early engines, like an E-6.. I believe they had eccentric pins that can be rotated to align the flywheel housing. But to the best of my knowledge, the E-7 didnt really need to be checked. yes lots of movement in the tranny input shaft, .020" runout, is probably nothing to worry about. especially because my E-7 book said so. It doesnt hurt to check it, but I dont know how you would adjust it. But if excessive runout was found, then I would try to find out WHY so I dont build the issue back into it again.. just my thoughts, combined with the book knowledge, I always welcome more opinion's.. I learn from them.. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/68973-mr688s-frame-work/page/6/#findComment-497042 Share on other sites More sharing options...
JoeH Posted May 8, 2022 Author Share Posted May 8, 2022 Allison Auto & torque converter bolted to the flex plate. Not sure how much "slop" the Allison input shaft can tolerate. Quote Link to comment https://www.bigmacktrucks.com/topic/68973-mr688s-frame-work/page/6/#findComment-497103 Share on other sites More sharing options...
terry Posted May 8, 2022 Share Posted May 8, 2022 9 hours ago, Joey Mack said: I beleive the runout procedure came from early engines, like an E-6.. I believe they had eccentric pins that can be rotated to align the flywheel housing. But to the best of my knowledge, the E-7 didnt really need to be checked. yes lots of movement in the tranny input shaft, .020" runout, is probably nothing to worry about. especially because my E-7 book said so. It doesnt hurt to check it, but I dont know how you would adjust it. But if excessive runout was found, then I would try to find out WHY so I dont build the issue back into it again.. just my thoughts, combined with the book knowledge, I always welcome more opinion's.. I learn from them.. jojo I believe the earlier Mack’s, after the flywheel housing was dialed in, you reamed the holes for a oversized dowel then tapped them in. Terry 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68973-mr688s-frame-work/page/6/#findComment-497113 Share on other sites More sharing options...
JoeH Posted May 8, 2022 Author Share Posted May 8, 2022 19 minutes ago, terry said: I believe the earlier Mack’s, after the flywheel housing was dialed in, you reamed the holes for a oversized dowel then tapped them in. Terry That makes sense. Quote Link to comment https://www.bigmacktrucks.com/topic/68973-mr688s-frame-work/page/6/#findComment-497115 Share on other sites More sharing options...
theakerstwo Posted May 8, 2022 Share Posted May 8, 2022 17 minutes ago, terry said: I believe the earlier Mack’s, after the flywheel housing was dialed in, you reamed the holes for a oversized dowel then tapped them in. Terry I may be wrong but i dont remember that.I have never seen one on any mack that was off center unless the block was line bored but then it would be very little off center.When we did dial them and found one off it was always a bad housing or distorded or broken.In later years on a E6 and E7 i got were i would not put a dial on one if it was a replacement.You want to see from top to bottom same and from one side to the other same and i think the reading can be as much as .010 off center. 2 Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/68973-mr688s-frame-work/page/6/#findComment-497116 Share on other sites More sharing options...
Joey Mack Posted May 9, 2022 Share Posted May 9, 2022 yes Glenn. and My Mack E-7 book shows .020" runout.. I guess that would be .010" per side. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/68973-mr688s-frame-work/page/6/#findComment-497125 Share on other sites More sharing options...
theakerstwo Posted May 9, 2022 Share Posted May 9, 2022 joey i think run out would mean .020 off center and if the specs in the manual say that then i would be off center.I was only guessing from most engines will give about .010.I need to stop guessing. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/68973-mr688s-frame-work/page/6/#findComment-497133 Share on other sites More sharing options...
Joey Mack Posted May 9, 2022 Share Posted May 9, 2022 Glenn,,, you have a ton of knowledge.. I just posted what the book said.. Myself , I dont recall having runout issues with all the E-7's I have been around. The loose bolts I have had ,caused damage to the bell housing on Mack trannys that was not fixable without a case replacement.. 200 + 300 series trannys.. for what it's worth,, youre never guessing to me.. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/68973-mr688s-frame-work/page/6/#findComment-497134 Share on other sites More sharing options...
Vladislav Posted May 9, 2022 Share Posted May 9, 2022 8 hours ago, Joey Mack said: yes Glenn. and My Mack E-7 book shows .020" runout.. I guess that would be .010" per side. jojo To my understanding runout is a difference between max and min distance from the crankshaft center. Actually you need the basic size of that circle specified to be almost accurate. Say 24.098 +-0.010". But Mack specified just the runout. Probably in practice its fugure would be much bigger if the housing is worn really bed. Or anything else. Mack engeneers had something on their mind when established the check procedure. E6 and earlier dowel pins I saw were all cylindrical. I can't boast I saw really many Mack engines though. But kept my attention on readings on here for years. What I learned is what Terry posted above. This way Glenn's comment is really interesting pointing out he during the years of his experience seldom saw the runout issues and (never?) oversized dowel pins. So seems the runout procedure is mostly aimed to check on seriouse damage of the housing. Honestly I still can't figure out what kind of damage loosy tranny bolts did to the housing. If they damaged threads they went into you would swap the flywheel housing. And if they didn't damage them I see no reason the bolts were getting loose again after some milage. Another seemed issue is the tranny centering flange (rim) wear. That would affect the centering but actually of the spoken input shaft. And I don't understand how that may affect the bolt tightness. Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment https://www.bigmacktrucks.com/topic/68973-mr688s-frame-work/page/6/#findComment-497161 Share on other sites More sharing options...
JoeH Posted May 9, 2022 Author Share Posted May 9, 2022 (edited) 12 hours ago, theakerstwo said: I may be wrong but i dont remember that.I have never seen one on any mack that was off center unless the block was line bored but then it would be very little off center.When we did dial them and found one off it was always a bad housing or distorded or broken.In later years on a E6 and E7 i got were i would not put a dial on one if it was a replacement.You want to see from top to bottom same and from one side to the other same and i think the reading can be as much as .010 off center. .010 is if you're using a Machined Dowel type runout gauge that fits into the engine in place of the crankshaft. .020 is if you're bolting a runout gauge to the crankshaft. The difference in runout tolerance is because of any wobble in the crankshaft/bearings. According to the book. Edited May 9, 2022 by JoeH 2 Quote Link to comment https://www.bigmacktrucks.com/topic/68973-mr688s-frame-work/page/6/#findComment-497166 Share on other sites More sharing options...
JoeH Posted May 10, 2022 Author Share Posted May 10, 2022 All reassembled and operable. Tomorrow is "Sink or Swim". 2 Quote Link to comment https://www.bigmacktrucks.com/topic/68973-mr688s-frame-work/page/6/#findComment-497213 Share on other sites More sharing options...
DavCut Posted May 11, 2022 Share Posted May 11, 2022 On 5/9/2022 at 9:26 PM, JoeH said: All reassembled and operable. Tomorrow is "Sink or Swim". So @JoeH, did the lifeguard have to jump in after you? Enquirering minds want to know. 🙂 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68973-mr688s-frame-work/page/6/#findComment-497346 Share on other sites More sharing options...
Popular Post JoeH Posted May 11, 2022 Author Popular Post Share Posted May 11, 2022 Swim; haven't had time to put our lettering on the side of the mixer body, that's just one thing on the long "to do" list. More important is the brake S cam bushings are worn. Truck will be getting cam bushings and new slack adjusters soon, I have to adjust the brakes every morning. 3 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68973-mr688s-frame-work/page/6/#findComment-497352 Share on other sites More sharing options...
Joey Mack Posted May 11, 2022 Share Posted May 11, 2022 Awesome..... jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68973-mr688s-frame-work/page/6/#findComment-497353 Share on other sites More sharing options...
DavCut Posted May 11, 2022 Share Posted May 11, 2022 Glad to hear that you are at least treading water with her @JoeH! Having to adjust the brakes every morning doesn't sound like much fun, but at the same time you know what the problem is and how to fix it, now to find the time. Good to see her on the road and making money. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/68973-mr688s-frame-work/page/6/#findComment-497371 Share on other sites More sharing options...
mowerman Posted May 11, 2022 Share Posted May 11, 2022 Glad to see you out there and make a money best of luck to you partner… bob 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68973-mr688s-frame-work/page/6/#findComment-497402 Share on other sites More sharing options...
DavCut Posted May 21, 2022 Share Posted May 21, 2022 At the risk of bringing up a sore subject @JoeH were you able to get the paperwork straight with PennDOT? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68973-mr688s-frame-work/page/6/#findComment-498153 Share on other sites More sharing options...
Popular Post JoeH Posted May 21, 2022 Author Popular Post Share Posted May 21, 2022 Yup, been on the road 2 weeks now 2 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68973-mr688s-frame-work/page/6/#findComment-498165 Share on other sites More sharing options...
DavCut Posted May 22, 2022 Share Posted May 22, 2022 Glad to hear that @JoeH. Hope that she provides years of profitable service to you! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68973-mr688s-frame-work/page/6/#findComment-498253 Share on other sites More sharing options...
mowerman Posted May 22, 2022 Share Posted May 22, 2022 I was wondering that myself but I figured you got it all squared away… bob Quote Link to comment https://www.bigmacktrucks.com/topic/68973-mr688s-frame-work/page/6/#findComment-498303 Share on other sites More sharing options...
DavCut Posted August 15, 2022 Share Posted August 15, 2022 So @JoeH how is the MR treating you? I don’t think I’ve seen any posts from you about problems so hopefully that is a good sign that she is out making money for you every day. Quote Link to comment https://www.bigmacktrucks.com/topic/68973-mr688s-frame-work/page/6/#findComment-506408 Share on other sites More sharing options...
DavCut Posted September 22, 2022 Share Posted September 22, 2022 Good evening @JoeH . Saw you had been around in another thread. Guessing this one has fallen off your radar. How is the MR treating you? Hope that the setup is working as well if not better than you planned. Quote Link to comment https://www.bigmacktrucks.com/topic/68973-mr688s-frame-work/page/6/#findComment-510045 Share on other sites More sharing options...
DavCut Posted December 21, 2022 Share Posted December 21, 2022 Me again @JoeH. How's the MR treating you after 6 months? Any big projects planned for the winter? Quote Link to comment https://www.bigmacktrucks.com/topic/68973-mr688s-frame-work/page/6/#findComment-518773 Share on other sites More sharing options...
JoeH Posted December 23, 2022 Author Share Posted December 23, 2022 Truck is working well; concrete season is over, now we have to keep our heads low to pay off the mixer over the next 4 years. This is our current project we've been working on. Hopefully we can get this mixer rebuild completed sometime in the first half of 2023. Less Mack related stuff on this build, so it probably won't find it's way onto the forum. The horse is a 1988 RD690S with an EM6-300L. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68973-mr688s-frame-work/page/6/#findComment-518866 Share on other sites More sharing options...
terry Posted December 23, 2022 Share Posted December 23, 2022 Should be a trouble free one!! terry Quote Link to comment https://www.bigmacktrucks.com/topic/68973-mr688s-frame-work/page/6/#findComment-518870 Share on other sites More sharing options...
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