Fridley mechanics Posted 15 hours ago Share Posted 15 hours ago have a 2016 mack gu712, with mp7 after replacing alternator belt a year ago , its starting to make noise again determined it was the belt as noise went away with water sprayed onto belt, also have replaced the tensioner and verified no pulley bearing noise, and it seems that this truck has had multiple belts put on over the years for noisy belt , can not visually see anything wrong, has anyone experienced this ? Quote Link to comment https://www.bigmacktrucks.com/topic/74910-new-alternator-belts-after-a-year-making-noise/ Share on other sites More sharing options...
mrsmackpaul Posted 14 hours ago Share Posted 14 hours ago I gather its a serpentine type of set up ? Paul 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74910-new-alternator-belts-after-a-year-making-noise/#findComment-564825 Share on other sites More sharing options...
Joey Mack Posted 14 hours ago Share Posted 14 hours ago So none of the pulleys are leaning slightly? Have you tried the serp belt that has the cross hatching on the back side? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74910-new-alternator-belts-after-a-year-making-noise/#findComment-564827 Share on other sites More sharing options...
Popular Post mrsmackpaul Posted 12 hours ago Popular Post Share Posted 12 hours ago So if a serpentine pulley is like a lotta normal Vee belt pulleys but side by side on a small scale, at least in my mind thats how I picture them Anyway if a serpentine pulley isn't even across the belt surface it would mean the belt be slipping on the smaller and larger section of the pulley Maybe get a straight edge and lay it across each pulley and look for correctness of the pulley And a long straight edge and line the face of each pulley up with crank pulley to make sure they are actually square to the crank I don't have a lot of experience with these but the few issues I have had over the years are pretty easy to spot once I start checking things Paul 3 Quote Link to comment https://www.bigmacktrucks.com/topic/74910-new-alternator-belts-after-a-year-making-noise/#findComment-564840 Share on other sites More sharing options...
mowerman Posted 11 hours ago Share Posted 11 hours ago Hopefully this isn’t it, but I have had belt sounding noises on a Cummings turns out the water pump was shot. The bearing was making all the noises didn’t discover this was the noise until the water pump started leaking and they changed it sound one away good luck, bud. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74910-new-alternator-belts-after-a-year-making-noise/#findComment-564842 Share on other sites More sharing options...
Joey Mack Posted 11 hours ago Share Posted 11 hours ago Which belt is squealing Quote Link to comment https://www.bigmacktrucks.com/topic/74910-new-alternator-belts-after-a-year-making-noise/#findComment-564844 Share on other sites More sharing options...
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