Lukasswaziek Posted October 23 Share Posted October 23 81 Mack 686, front drive rear end is making a random popping noise while driving, I'm guessing it's the power divider, has the auto one, but it's also puking oil out the breather? I don't know what would make it do that. Oil looks good in it, nothing out of the ordinary. Anything else it could be? I'd rather just pull the power divider than the whole carrier but I'm tempted to pull it all just to check it out. Any advice is appreciated Quote Link to comment https://www.bigmacktrucks.com/topic/74671-mack-rear-end-popping/ Share on other sites More sharing options...
Joey Mack Posted October 23 Share Posted October 23 Where are you filling the rearend with oil ? And auto power divider peanuts will chatter, i bet there a 2 grooves ground into the outer cam drum in the power divider.. Quote Link to comment https://www.bigmacktrucks.com/topic/74671-mack-rear-end-popping/#findComment-560612 Share on other sites More sharing options...
Lukasswaziek Posted October 23 Author Share Posted October 23 This truck is new to me, I checked rear end oil when I got it but never changed it, could of been overfull. And yes the outer drum is worn good, along with the inner cam. Popping was random intervals and very loud, would that be it? Thanks for the reply Quote Link to comment https://www.bigmacktrucks.com/topic/74671-mack-rear-end-popping/#findComment-560618 Share on other sites More sharing options...
Lukasswaziek Posted October 23 Author Share Posted October 23 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74671-mack-rear-end-popping/#findComment-560619 Share on other sites More sharing options...
Joey Mack Posted October 23 Share Posted October 23 It can be, as far as oil level, pull the rear plug in the banjo housing and see if oil drains out. You may need to pull the side cover to inspect the top reduction.. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74671-mack-rear-end-popping/#findComment-560620 Share on other sites More sharing options...
Joey Mack Posted October 23 Share Posted October 23 Yep,,, thats what i was talking about.. and yes the noise can come from that. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74671-mack-rear-end-popping/#findComment-560621 Share on other sites More sharing options...
Lukasswaziek Posted October 23 Author Share Posted October 23 Still stumped why the oil would come out the breather like that.. the level has never changed and it never did that until it started making noise 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74671-mack-rear-end-popping/#findComment-560632 Share on other sites More sharing options...
Joey Mack Posted October 23 Share Posted October 23 it is strange, I assume the breather was flushed out with brake clean and re-installed.. and you dont have leaking wheel seals? is the top of the breather missing? that will allow oil to splash out, I guess.. odd.... does that rear get really hot during the work day? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74671-mack-rear-end-popping/#findComment-560633 Share on other sites More sharing options...
Lukasswaziek Posted October 23 Author Share Posted October 23 The breather is intact and I cleaned it out, and when I checked the rear end yesterday it was warm but not hot. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74671-mack-rear-end-popping/#findComment-560636 Share on other sites More sharing options...
Joey Mack Posted October 23 Share Posted October 23 Bud,, I cant think of any reason why it woould push oil out of the breather,, given your postings.. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74671-mack-rear-end-popping/#findComment-560638 Share on other sites More sharing options...
mrsmackpaul Posted October 23 Share Posted October 23 A few things to check before pulling it all apart Are tyres all the same size, not just the same number, get a tape and measure them On Mack bogies this is important as the power divider isnt a true power divider If the tyres are different in sizes you can here the tyres chirp when running empty Paul 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74671-mack-rear-end-popping/#findComment-560642 Share on other sites More sharing options...
Popular Post Lukasswaziek Posted October 23 Author Popular Post Share Posted October 23 Paul, when I got this truck it had mismatched size tires all around, so no surprise the power divider is having issues now. As soon as I got it I put new tires all the way around. Thanks for the replies. I rebuilt the power divider with a good one out of some axles I have, will see tomorrow if it fixes my issue 3 Quote Link to comment https://www.bigmacktrucks.com/topic/74671-mack-rear-end-popping/#findComment-560645 Share on other sites More sharing options...
Joey Mack Posted October 23 Share Posted October 23 where you able to replace the outer cam drum? and able to get the 1500 ftlbs of torque on it? just curious how you got it done.. I assume you have the cam drum holding tool.. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74671-mack-rear-end-popping/#findComment-560646 Share on other sites More sharing options...
Mark T Posted October 23 Share Posted October 23 Lots of outter cam missing there. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74671-mack-rear-end-popping/#findComment-560649 Share on other sites More sharing options...
Popular Post terry Posted October 24 Popular Post Share Posted October 24 5 hours ago, Joey Mack said: where you able to replace the outer cam drum? and able to get the 1500 ftlbs of torque on it? just curious how you got it done.. I assume you have the cam drum holding tool.. alot of people have a different definition of what a rebuilt consists of! Terry 3 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74671-mack-rear-end-popping/#findComment-560676 Share on other sites More sharing options...
Vladislav Posted October 25 Share Posted October 25 I may be seen out of the line by the crowd but I don't see really crytical wear on both outer and inner cams. It's there for sure but I'd estimate the condition of the parts as 4 of 5. 1 Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment https://www.bigmacktrucks.com/topic/74671-mack-rear-end-popping/#findComment-560794 Share on other sites More sharing options...
Joey Mack Posted October 25 Share Posted October 25 Yep,,, thats what i was talking about.. and yes the noise can come from that. Quote Link to comment https://www.bigmacktrucks.com/topic/74671-mack-rear-end-popping/#findComment-560795 Share on other sites More sharing options...
Popular Post Joey Mack Posted October 25 Popular Post Share Posted October 25 Yes Vlad, however if you ad up the wear on the cams and the peanuts, which im sure are ground down, popping noises are possible.. i never liked these auto power dividers anyway.. 1 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74671-mack-rear-end-popping/#findComment-560796 Share on other sites More sharing options...
terry Posted October 25 Share Posted October 25 By the time you add up just a little wear on the inner cam, peanuts, and outer cam themselves, can be alot more than you realize. Terry 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74671-mack-rear-end-popping/#findComment-560799 Share on other sites More sharing options...
fjh Posted October 25 Share Posted October 25 4 hours ago, Joey Mack said: Yes Vlad, however if you ad up the wear on the cams and the peanuts, which im sure are ground down, popping noises are possible.. i never liked these auto power dividers anyway.. yup spiders and a lock out are more sensible! More for giving when you got miss matched tires! 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74671-mack-rear-end-popping/#findComment-560815 Share on other sites More sharing options...
mechohaulic Posted October 26 Share Posted October 26 On 10/23/2024 at 7:07 PM, Joey Mack said: where you able to replace the outer cam drum? and able to get the 1500 ftlbs of torque on it? just curious how you got it done.. I assume you have the cam drum holding tool.. what's it look like ?? 50 yrs later no Body tells me nothin till now!! install the drum/nut then air gun the sh- t outta it. never cared for the "auto" dividers . then again never cared for auto transmissions in big trucks with exceptions "sanitation removal units /fire dept etc ) 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74671-mack-rear-end-popping/#findComment-560816 Share on other sites More sharing options...
Joey Mack Posted October 26 Share Posted October 26 Mech.. he posted a picture of the outer cam drum.. it is as bad as the ones you saw 95 years ago... just sayin' 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74671-mack-rear-end-popping/#findComment-560817 Share on other sites More sharing options...
Mark T Posted October 26 Share Posted October 26 10 minutes ago, Joey Mack said: Mech.. he posted a picture of the outer cam drum.. it is as bad as the ones you saw 95 years ago... just sayin' 10 minutes ago, Joey Mack said: Mech.. he posted a picture of the outer cam drum.. it is as bad as the ones you saw 95 years ago... just sayin' Eazy JoJo. I think I even got splattered with blood on that one. (95 years ago) 🤪 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74671-mack-rear-end-popping/#findComment-560820 Share on other sites More sharing options...
Joey Mack Posted October 26 Share Posted October 26 Sorry Grandpa.. You Crack me up Bud.. Quote Link to comment https://www.bigmacktrucks.com/topic/74671-mack-rear-end-popping/#findComment-560821 Share on other sites More sharing options...
Mark T Posted October 26 Share Posted October 26 If I was a wise a$$, I'd point out they were chain drive back then 😇 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74671-mack-rear-end-popping/#findComment-560826 Share on other sites More sharing options...
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