acesneights1 Posted December 19, 2015 Share Posted December 19, 2015 Hi, New but have been around Macks most of my life. I scored what was listed as an AM General M52a2 Tractor...Well as soon as I popped the hood...I know a Mack motor when I see one and this truck is a Mack. The data plate says M52a1. I'm told these are rare. I was gonna cut the truck up for parts for my M813 but now I want to keep it if it's a Mack. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/43181-think-i-just-bought-a-mack-m52a1/ Share on other sites More sharing options...
Michael Droster Posted December 19, 2015 Share Posted December 19, 2015 I wouldn't cut up a Mack! They are the holy grail of mil-spec 5tons!! Love them!!! Quote Link to comment https://www.bigmacktrucks.com/topic/43181-think-i-just-bought-a-mack-m52a1/#findComment-316476 Share on other sites More sharing options...
acesneights1 Posted December 19, 2015 Author Share Posted December 19, 2015 No for sure I will NOT be cutting this one up. I am going to try and start it tomorrow. What motors do these have 676 or 673s ? Quote Link to comment https://www.bigmacktrucks.com/topic/43181-think-i-just-bought-a-mack-m52a1/#findComment-316479 Share on other sites More sharing options...
acesneights1 Posted December 19, 2015 Author Share Posted December 19, 2015 More pics from the recovery... Quote Link to comment https://www.bigmacktrucks.com/topic/43181-think-i-just-bought-a-mack-m52a1/#findComment-316480 Share on other sites More sharing options...
acesneights1 Posted December 20, 2015 Author Share Posted December 20, 2015 Changing tha tires was a breeze with my robo tool. Quote Link to comment https://www.bigmacktrucks.com/topic/43181-think-i-just-bought-a-mack-m52a1/#findComment-316481 Share on other sites More sharing options...
j hancock Posted December 20, 2015 Share Posted December 20, 2015 What motors do these have 676 or 673s ?Nice! If there is no tag, the timing gear housing will be stamped on the top in front of the injection pump with the engine number. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/43181-think-i-just-bought-a-mack-m52a1/#findComment-316507 Share on other sites More sharing options...
Superdog Posted December 20, 2015 Share Posted December 20, 2015 pretty sure unless it's been replaced it should be a ENDT673,nice find. Quote Link to comment https://www.bigmacktrucks.com/topic/43181-think-i-just-bought-a-mack-m52a1/#findComment-316532 Share on other sites More sharing options...
Michael Droster Posted December 20, 2015 Share Posted December 20, 2015 If it's a Jeep it'll be a ENDT-673 205hp, If. It's a Mack built trucks it'll be the ENDT673C with 250hp... if she's an AM General then the sad news is the Mack diesel is gone Quote Link to comment https://www.bigmacktrucks.com/topic/43181-think-i-just-bought-a-mack-m52a1/#findComment-316535 Share on other sites More sharing options...
acesneights1 Posted December 21, 2015 Author Share Posted December 21, 2015 If it's a Jeep it'll be a ENDT-673 205hp, If. It's a Mack built trucks it'll be the ENDT673C with 250hp... if she's an AM General then the sad news is the Mack diesel is gone paperworknsays AM General but that is a Mack Motor for sure and I think its the 673. The data plate does not give manufacturer so I don't think it is an Am General. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/43181-think-i-just-bought-a-mack-m52a1/#findComment-316676 Share on other sites More sharing options...
ranchhopper Posted December 21, 2015 Share Posted December 21, 2015 That's a mack with the fuel filters on a slant the IP is on the opposite side than on a multifuel too. Quote Link to comment https://www.bigmacktrucks.com/topic/43181-think-i-just-bought-a-mack-m52a1/#findComment-316723 Share on other sites More sharing options...
Michael Droster Posted December 22, 2015 Share Posted December 22, 2015 Yep you got a Mack! Quote Link to comment https://www.bigmacktrucks.com/topic/43181-think-i-just-bought-a-mack-m52a1/#findComment-316746 Share on other sites More sharing options...
acesneights1 Posted December 25, 2015 Author Share Posted December 25, 2015 Well, got her running today but it seems to have alot of crankcase pressure. The only breather appears to be from the oil fill cap to the air intake and then two small lines off the top of the valve cover. Maybe stuck rings ? Or time for an in frame ? Quote Link to comment https://www.bigmacktrucks.com/topic/43181-think-i-just-bought-a-mack-m52a1/#findComment-317282 Share on other sites More sharing options...
acesneights1 Posted December 25, 2015 Author Share Posted December 25, 2015 It's a shame because it seems to run good otherwise but when I take the cap off you can hear pressure releasing. I would imagine that much pressure will start blowing out seals etcs ? Could I put a better vent on the valve cover or is she done ? Quote Link to comment https://www.bigmacktrucks.com/topic/43181-think-i-just-bought-a-mack-m52a1/#findComment-317283 Share on other sites More sharing options...
acesneights1 Posted December 25, 2015 Author Share Posted December 25, 2015 It almost seems like that cap works like a radiator cap allowing a certain amount of pressure to build up ?? There should be no pressure correct ? Quote Link to comment https://www.bigmacktrucks.com/topic/43181-think-i-just-bought-a-mack-m52a1/#findComment-317284 Share on other sites More sharing options...
terry Posted December 25, 2015 Share Posted December 25, 2015 I've seen them old mack engines with alot more blowby than that, and they can run an awful long time. terry Quote Link to comment https://www.bigmacktrucks.com/topic/43181-think-i-just-bought-a-mack-m52a1/#findComment-317308 Share on other sites More sharing options...
medicpelle Posted December 25, 2015 Share Posted December 25, 2015 Nice find! How did you find out about it? Quote Link to comment https://www.bigmacktrucks.com/topic/43181-think-i-just-bought-a-mack-m52a1/#findComment-317315 Share on other sites More sharing options...
carlotpilot Posted December 25, 2015 Share Posted December 25, 2015 i`m guessing theres a breather tube stopped up mouse nest -mud dauber? Quote Link to comment https://www.bigmacktrucks.com/topic/43181-think-i-just-bought-a-mack-m52a1/#findComment-317320 Share on other sites More sharing options...
fifth wheel Posted December 25, 2015 Share Posted December 25, 2015 It's a shame because it seems to run good otherwise but when I take the cap off you can hear pressure releasing. I would imagine that much pressure will start blowing out seals etcs ? Could I put a better vent on the valve cover or is she done ?No sure but most military units were able to ford, so the crankcase could be vented different. Does it have a road vent tube?.FW 1 Quote Link to comment https://www.bigmacktrucks.com/topic/43181-think-i-just-bought-a-mack-m52a1/#findComment-317325 Share on other sites More sharing options...
acesneights1 Posted December 25, 2015 Author Share Posted December 25, 2015 No sure but most military units were able to ford, so the crankcase could be vented different. Does it have a road vent tube?.FWYou know, you may be on to something. No it does not have a road tube that I can see. This one does have the Fording kit on it. It makes sense now. The one breather at the oil fill is piped into the air filter. There are two more small ones off the top of the valve cover that just point down . They look like the old crankcase tubes we use to put on the Detroit. These tubes both have valves on them operated by the Fording cable in the cab. I will double check that the are clear.Any ideas where I could find the oil filter numbers and fuel filter ? I could not find anything at Steel Soldiers. Being that this is a Mack motor did the civilian version of it have spin ons or canister also ? Quote Link to comment https://www.bigmacktrucks.com/topic/43181-think-i-just-bought-a-mack-m52a1/#findComment-317340 Share on other sites More sharing options...
acesneights1 Posted December 25, 2015 Author Share Posted December 25, 2015 (edited) Nice find! How did you find out about it?I buy and sell alot from the auctions and know some people..... Being unhappily married and having a mother in law living with me gives me alot of time in front of the computer... Edited December 25, 2015 by acesneights1 Quote Link to comment https://www.bigmacktrucks.com/topic/43181-think-i-just-bought-a-mack-m52a1/#findComment-317341 Share on other sites More sharing options...
VT Mack Posted December 25, 2015 Share Posted December 25, 2015 Nice tractor! Quote Link to comment https://www.bigmacktrucks.com/topic/43181-think-i-just-bought-a-mack-m52a1/#findComment-317381 Share on other sites More sharing options...
mowerman Posted December 25, 2015 Share Posted December 25, 2015 man,,,that thing is a monster,,,pretty cool rig...bob Quote Link to comment https://www.bigmacktrucks.com/topic/43181-think-i-just-bought-a-mack-m52a1/#findComment-317386 Share on other sites More sharing options...
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