cliff Posted January 7, 2014 Share Posted January 7, 2014 Hello, I am only one that probably needs help on this one but I can use some advise. Have a B Model, single drive axel, and don't correctly know if I am filling up rear-end right or not. It has Dual reduction box on front, with fill plug on top, very rear of 3rd member, slightly below the "Mack" raised letter is fill plug. Question, do I fill in from the top plug on top of Dual reduction box till it grease runs out of fill plug on rear of 3rd member housing?? Also, living in the south, what wt. should I use? The dual reduction box sits so high above the 3rd member I feel that I am not putting in enough grease to also give lube to dual reduction gears if I stop when grease starts running out of rear end fill plug. Also I have a sound, not a knock but almost like a wrist pin sound. Could a bad injector produce a sound that seems its coming from within the motor. Engine runs smooth, 653. Engine has not changed sounds in the 3 years I have been running it. Any help to above would be greatly appreciated. I have the Mack operation book but time to go to the experts. Cliff of Georgia 1 Quote Link to comment https://www.bigmacktrucks.com/topic/34149-just-how-much-rear-end-dope-grease-needed/ Share on other sites More sharing options...
Maddog13407 Posted January 7, 2014 Share Posted January 7, 2014 pull the plug next to the Mack script, fill her up til it starts running out the hole. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/34149-just-how-much-rear-end-dope-grease-needed/#findComment-225276 Share on other sites More sharing options...
cliff Posted January 8, 2014 Author Share Posted January 8, 2014 Thanks for the info. I thought the same but had doubts. By me overfilling, as I have done I am getting seepage around top bolts to cover of the rear end. Now this can easily be corrected. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/34149-just-how-much-rear-end-dope-grease-needed/#findComment-225382 Share on other sites More sharing options...
Maddog13407 Posted January 8, 2014 Share Posted January 8, 2014 don't worry, even when filled right , something has gotta leak, Macks are like an old Panhead, something always drips. have taken many pinion yolk flanges apart only to find two seals in back to back tryin to keep the grease in the rear end. Quote Link to comment https://www.bigmacktrucks.com/topic/34149-just-how-much-rear-end-dope-grease-needed/#findComment-225490 Share on other sites More sharing options...
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