sgosine577 Posted December 20, 2010 Share Posted December 20, 2010 I have a 1988 Mack Mr600 with an E6 engine. The bolts holding the harmonic Balancer broke off. What would cause this, and what are the torque requirements for the the new bolts when I install the new Harmonic Balancer. Quote Link to comment https://www.bigmacktrucks.com/topic/16923-harmonic-balancer-bolts-broke-off/ Share on other sites More sharing options...
fjh Posted December 20, 2010 Share Posted December 20, 2010 I have a 1988 Mack Mr600 with an E6 engine. The bolts holding the harmonic Balancer broke off. What would cause this, and what are the torque requirements for the the new bolts when I install the new Harmonic Balancer.I don't remember the specs for that but I would guess somwhere in the hood of 50 foot pounds they are 7/16 bolts! DON'T REUSE that damper REPLACE IT if that came loose out of the blue somthing is wrong and its likly the damper its self! Quote Link to comment https://www.bigmacktrucks.com/topic/16923-harmonic-balancer-bolts-broke-off/#findComment-68840 Share on other sites More sharing options...
GreenGiant2 Posted December 20, 2010 Share Posted December 20, 2010 I don't remember the specs for that but I would guess somwhere in the hood of 50 foot pounds they are 7/16 bolts! DON'T REUSE that damper REPLACE IT if that came loose out of the blue somthing is wrong and its likly the damper its self!i jusy read that cummins say's you should replace the harmonic balancer every 380,000 miles Quote We the unwilling, Lead by the unqualified, are doing the impossible, for the ungrateful. Link to comment https://www.bigmacktrucks.com/topic/16923-harmonic-balancer-bolts-broke-off/#findComment-68855 Share on other sites More sharing options...
rhasler Posted December 21, 2010 Share Posted December 21, 2010 i jusy read that cummins say's you should replace the harmonic balancer every 380,000 milesReMack engines come with a warning label to check the dampner before installing it on a rebuilt engine, but I don't think they give any specific criteria for replacement. Quote "Mebbe I'm too ugly and stupid to give up!" Link to comment https://www.bigmacktrucks.com/topic/16923-harmonic-balancer-bolts-broke-off/#findComment-68864 Share on other sites More sharing options...
theakerstwo Posted December 21, 2010 Share Posted December 21, 2010 ReMack engines come with a warning label to check the dampner before installing it on a rebuilt engine, but I don't think they give any specific criteria for replacement.What is macks way of checking one. Cummins and DD i know about but never did know how to check a mack. Only way i know would be mic it. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/16923-harmonic-balancer-bolts-broke-off/#findComment-68870 Share on other sites More sharing options...
rhasler Posted December 21, 2010 Share Posted December 21, 2010 What is macks way of checking one. Cummins and DD i know about but never did know how to check a mack. Only way i know would be mic it.Mostly just a visual inspection involving checking for bulging, cracking, splitting. or distortion of the casing. I would imagine that the same checks made for Cummins or Detroit would be more than adequate for Mack's dampners. I'm not sure who builds the MP/volvo engine dampners, but I remember reading that back when Holset was independent, back before they were making turbos and compressors, they were the supplier that volvo had chosen for their dampners. If I remember correctly that was why Cummins bought Holset in the first place, in order to get their foot in the door at volvo. Quote "Mebbe I'm too ugly and stupid to give up!" Link to comment https://www.bigmacktrucks.com/topic/16923-harmonic-balancer-bolts-broke-off/#findComment-68874 Share on other sites More sharing options...
theakerstwo Posted December 21, 2010 Share Posted December 21, 2010 And speaking of Holset i have a E7 engine here that has a Holset compressor on it. First for me.I guess you have seen alot of them. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/16923-harmonic-balancer-bolts-broke-off/#findComment-68876 Share on other sites More sharing options...
rhasler Posted December 21, 2010 Share Posted December 21, 2010 And speaking of Holset i have a E7 engine here that has a Holset compressor on it. First for me.I guess you have seen alot of them.I know that Mack used some Holset compressors but can't remember seeing an engine with one. I imagine it was an option that didn't have widespread acceptance. Quote "Mebbe I'm too ugly and stupid to give up!" Link to comment https://www.bigmacktrucks.com/topic/16923-harmonic-balancer-bolts-broke-off/#findComment-68879 Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.