raybing Posted December 22, 2015 Share Posted December 22, 2015 I am going to look at a truck for sale in Alabama this week. It is described as a 300 2 stick. I am famailiar with the E6-E7 motors. Can someone help me understand what this combo is and what to watch for? Thanks in advance. Ray Quote Link to comment https://www.bigmacktrucks.com/topic/43198-1976-r-model-300-motor/ Share on other sites More sharing options...
terry Posted December 22, 2015 Share Posted December 22, 2015 Almost need a little more info, that old of a truck could have had alot of changes over the years, two stick is probably the old six speed. five speed with low, direct and reverse on the other stick. could be a full 300 or the old 285 series engine. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/43198-1976-r-model-300-motor/#findComment-316751 Share on other sites More sharing options...
raybing Posted December 22, 2015 Author Share Posted December 22, 2015 He said the motor is tagged 1976. called it a 300 plus. Pic shows 2 outlets going to engine from air cleaner Quote Link to comment https://www.bigmacktrucks.com/topic/43198-1976-r-model-300-motor/#findComment-316758 Share on other sites More sharing options...
raybing Posted December 22, 2015 Author Share Posted December 22, 2015 http://shoals.craigslist.org/hvo/5367944201.html maybe viewing could help Quote Link to comment https://www.bigmacktrucks.com/topic/43198-1976-r-model-300-motor/#findComment-316761 Share on other sites More sharing options...
Outbehindthebarn Posted December 22, 2015 Share Posted December 22, 2015 Link's dead. Quote Fun is what they fine you for!My name is Bob Buckman sir,. . . and I hate truckers. Link to comment https://www.bigmacktrucks.com/topic/43198-1976-r-model-300-motor/#findComment-316764 Share on other sites More sharing options...
raybing Posted December 22, 2015 Author Share Posted December 22, 2015 https://shoals.craigslist.org/hvo/5367944201.html Quote Link to comment https://www.bigmacktrucks.com/topic/43198-1976-r-model-300-motor/#findComment-316774 Share on other sites More sharing options...
raybing Posted December 22, 2015 Author Share Posted December 22, 2015 seems to work now Quote Link to comment https://www.bigmacktrucks.com/topic/43198-1976-r-model-300-motor/#findComment-316775 Share on other sites More sharing options...
Popular Post Superdog Posted December 22, 2015 Popular Post Share Posted December 22, 2015 That looks like a nice one,the engine will most likely be the ENDT676 "300 series"Maxidyne rated at 283 hp,good combo with the 6 speed and plenty of power for a single axle. 4 Quote Link to comment https://www.bigmacktrucks.com/topic/43198-1976-r-model-300-motor/#findComment-316791 Share on other sites More sharing options...
thomastractorsvc Posted December 22, 2015 Share Posted December 22, 2015 Looks well taken care of. It is under cover, newer paint and the original style seat not torn up.See if he can send you a picture of both side of the engine and the engine spec/data plate Quote Robert"I reject your reality and substitute my own." Link to comment https://www.bigmacktrucks.com/topic/43198-1976-r-model-300-motor/#findComment-316792 Share on other sites More sharing options...
raybing Posted December 22, 2015 Author Share Posted December 22, 2015 He is sending more pictures and the vin # later today. He said all original and he is second owner, was a local fuel deliever. Quote Link to comment https://www.bigmacktrucks.com/topic/43198-1976-r-model-300-motor/#findComment-316799 Share on other sites More sharing options...
57 bcr Posted December 22, 2015 Share Posted December 22, 2015 Looks nice. That power train has been babied if it has always been an R or RD686P. Check cab for bodywork. That would be my only concern with that era of R. Other than that,she looks like a peach. Good luck,Ray! Al Quote IF YOU BOUGHT IT, A TRUCK BROUGHT IT..AND WHEN YOU'RE DONE WITH IT, A TRUCK WILL HAUL IT AWAY!!! Big John Trimble,WRVA Link to comment https://www.bigmacktrucks.com/topic/43198-1976-r-model-300-motor/#findComment-316804 Share on other sites More sharing options...
terry Posted December 22, 2015 Share Posted December 22, 2015 Pretty much what Mike said. Mike did they have the 285 engine that early? Quote Link to comment https://www.bigmacktrucks.com/topic/43198-1976-r-model-300-motor/#findComment-316806 Share on other sites More sharing options...
57 bcr Posted December 22, 2015 Share Posted December 22, 2015 Introduced the 300 series in '73-'74. Quote IF YOU BOUGHT IT, A TRUCK BROUGHT IT..AND WHEN YOU'RE DONE WITH IT, A TRUCK WILL HAUL IT AWAY!!! Big John Trimble,WRVA Link to comment https://www.bigmacktrucks.com/topic/43198-1976-r-model-300-motor/#findComment-316809 Share on other sites More sharing options...
raybing Posted December 26, 2015 Author Share Posted December 26, 2015 I went and drove it today. model R686ST-10644. listed as truck tractor with a lift axle. the johnson bar is still therehe swears was bought new as single axle fuel truck. possible the dealer removed 3rd axle.Motor ENDT 676 I think Hp 285 that was hard to read.The whole truck is in amazingly good condition.EXCEPT: The transmission pops of of 3 rd gear under light load and throwout bearing somewhat noisy.It does not steer very straight, does not pull, does not track well. possible king pins dry.So what needs to be done to the trans? a 2 stick 12 speed?Any advice would be appreciated. Thanks Ray Quote Link to comment https://www.bigmacktrucks.com/topic/43198-1976-r-model-300-motor/#findComment-317472 Share on other sites More sharing options...
Bigdogtrucker Posted December 26, 2015 Share Posted December 26, 2015 ST=factory tandem, he can ''swear'' all he wants Quote Link to comment https://www.bigmacktrucks.com/topic/43198-1976-r-model-300-motor/#findComment-317474 Share on other sites More sharing options...
terry Posted December 26, 2015 Share Posted December 26, 2015 I went and drove it today. model R686ST-10644. listed as truck tractor with a lift axle. the johnson bar is still therehe swears was bought new as single axle fuel truck. possible the dealer removed 3rd axle.Motor ENDT 676 I think Hp 285 that was hard to read.The whole truck is in amazingly good condition.EXCEPT: The transmission pops of of 3 rd gear under light load and throwout bearing somewhat noisy.It does not steer very straight, does not pull, does not track well. possible king pins dry.So what needs to be done to the trans? a 2 stick 12 speed?Any advice would be appreciated. Thanks RayS means 6 wheel, T means tractor. Quote Link to comment https://www.bigmacktrucks.com/topic/43198-1976-r-model-300-motor/#findComment-317477 Share on other sites More sharing options...
b61mack Posted December 26, 2015 Share Posted December 26, 2015 Are you sure it isn't a 2 stick 6 speed? someone must have changed the trans. if it is a 12 speed behind that 676. Quote Link to comment https://www.bigmacktrucks.com/topic/43198-1976-r-model-300-motor/#findComment-317478 Share on other sites More sharing options...
raybing Posted December 26, 2015 Author Share Posted December 26, 2015 Yes I meant to say 2 stick 6 speed, but reverse, low and high on one stick and 5 speed on otherfactory tandem make more since. especially with miles it has. original owner died and son sold it.Any thoughts on trans repair? Quote Link to comment https://www.bigmacktrucks.com/topic/43198-1976-r-model-300-motor/#findComment-317482 Share on other sites More sharing options...
Popular Post Superdog Posted December 26, 2015 Popular Post Share Posted December 26, 2015 I don't know what it would cost to fix,but you can buy a good used for $1000 about anywhere,if clutch is noisy you'll want to pull the trans. anyway. The only possibilty of it being a factory single axle if it was sent to mod center after build and changed,It used to happen. I have a B61ST that was done too,They don't change the VIN since it's already been issued. 3 Quote Link to comment https://www.bigmacktrucks.com/topic/43198-1976-r-model-300-motor/#findComment-317487 Share on other sites More sharing options...
thomastractorsvc Posted December 26, 2015 Share Posted December 26, 2015 If it was me when the trans was pulled to do the clutch you could inspect the trans and it maybe something simple like a shift rail spring. I think you could do bearings and seals, for a few hundred in you did the work yourself. 1 Quote Robert"I reject your reality and substitute my own." Link to comment https://www.bigmacktrucks.com/topic/43198-1976-r-model-300-motor/#findComment-317490 Share on other sites More sharing options...
Maddog13407 Posted December 27, 2015 Share Posted December 27, 2015 yup, id find another 6 speed or repair that one. if it only pops out of gear it sounds like it may be just in the rails 1 Quote Link to comment https://www.bigmacktrucks.com/topic/43198-1976-r-model-300-motor/#findComment-317548 Share on other sites More sharing options...
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