Maddog13407 Posted January 31, 2011 Share Posted January 31, 2011 just bought an engine from the junkyard. came in a running 1980 r model valueliner. guy let me drive it before we tore it apart and took the engine and tranny out. has a 10 speed roadranger behind it. this engine has the big Mack plenum on the driverside with a two tube air cleaner. i knew it was a 300+ engine. got it home and it is an ETAZ673A. i looked at the front of the block by the timing cover and it says T675 no END or anything in front of it. I thought 675 was for a 237 so why does the tg riveted on the block behind the injetion pump sayin its an ETAZ673A? just wondering. Also the roadranger says its a RT1110. what exactly is this model? a 1 to 1 direct 10 speed? thanks, Matt Quote Link to comment https://www.bigmacktrucks.com/topic/17787-675-vs-673/ Share on other sites More sharing options...
GreenGiant2 Posted January 31, 2011 Share Posted January 31, 2011 just bought an engine from the junkyard. came in a running 1980 r model valueliner. guy let me drive it before we tore it apart and took the engine and tranny out. has a 10 speed roadranger behind it. this engine has the big Mack plenum on the driverside with a two tube air cleaner. i knew it was a 300+ engine. got it home and it is an ETAZ673A. i looked at the front of the block by the timing cover and it says T675 no END or anything in front of it. I thought 675 was for a 237 so why does the tg riveted on the block behind the injetion pump sayin its an ETAZ673A? just wondering. Also the roadranger says its a RT1110. what exactly is this model? a 1 to 1 direct 10 speed? thanks, Mattif i remember correctly, 1110 stands for 1100 footpound torque and 10 speedgg2 Quote We the unwilling, Lead by the unqualified, are doing the impossible, for the ungrateful. Link to comment https://www.bigmacktrucks.com/topic/17787-675-vs-673/#findComment-71975 Share on other sites More sharing options...
Lmackattack Posted January 31, 2011 Share Posted January 31, 2011 Not sure about the 675 stamp but IIRC some one said that towards the end of the Hayward plant mack was sending engines out and then they would build them up as needed. Mack had spent alot of useless time and money moving parts to anbd from Hayward. It may have been that they sent out a ENDT675 and then added all the Chargecooling to make it a 300+?. Also could be that the over the trucks life the factory block went bad and parts from a diffrent truck were used? Do you have a build sheet with all the S/N Info? thats where I would start. Quote Link to comment https://www.bigmacktrucks.com/topic/17787-675-vs-673/#findComment-71979 Share on other sites More sharing options...
Rob Posted January 31, 2011 Share Posted January 31, 2011 just bought an engine from the junkyard. came in a running 1980 r model valueliner. guy let me drive it before we tore it apart and took the engine and tranny out. has a 10 speed roadranger behind it. this engine has the big Mack plenum on the driverside with a two tube air cleaner. i knew it was a 300+ engine. got it home and it is an ETAZ673A. i looked at the front of the block by the timing cover and it says T675 no END or anything in front of it. I thought 675 was for a 237 so why does the tg riveted on the block behind the injetion pump sayin its an ETAZ673A? just wondering. Also the roadranger says its a RT1110. what exactly is this model? a 1 to 1 direct 10 speed? thanks, MattThe tag is correct if the truck the engine is from was built after 4/1/1980. The tag is for a 300+ which was later called an E6-315. Same engine I have in my truck which is a 1980 model. I'd say it's prolly had an older timing cover placed onto a newer engine, or the engine was built from parts.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/17787-675-vs-673/#findComment-71995 Share on other sites More sharing options...
other dog Posted January 31, 2011 Share Posted January 31, 2011 if i remember correctly, 1110 stands for 1100 footpound torque and 10 speedgg2that's right, and the rt is direct in high gear, rto would be an overdrive trans. Quote Producer of poorly photo-chopped pictures since 1999. Link to comment https://www.bigmacktrucks.com/topic/17787-675-vs-673/#findComment-72002 Share on other sites More sharing options...
Maddog13407 Posted February 3, 2011 Author Share Posted February 3, 2011 serial number is Rs612LST52368 and the tag on the engine says its a 1979 model with 315 hp.is this the original engine for this truck? not that it matters, just wondering. thanks, Matt Quote Link to comment https://www.bigmacktrucks.com/topic/17787-675-vs-673/#findComment-72133 Share on other sites More sharing options...
Rob Posted February 3, 2011 Share Posted February 3, 2011 serial number is Rs612LST52368 and the tag on the engine says its a 1979 model with 315 hp.is this the original engine for this truck? not that it matters, just wondering. thanks, MattI don't have any books at home with me to research but the 1980 model year extended to 17 alphanumeric symbols for v.i.n. numbers from 13. I'm thinking for the 1979 model year that engine was still called an ENDT676 series.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/17787-675-vs-673/#findComment-72135 Share on other sites More sharing options...
b61mack Posted February 4, 2011 Share Posted February 4, 2011 serial number is Rs612LST52368 and the tag on the engine says its a 1979 model with 315 hp.is this the original engine for this truck? not that it matters, just wondering. thanks, MattAn F-712st is a 315hp so i would say a RS-612 is a 315hp also. Ron Quote Link to comment https://www.bigmacktrucks.com/topic/17787-675-vs-673/#findComment-72169 Share on other sites More sharing options...
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