realwolfdaddy Posted February 4, 2013 Share Posted February 4, 2013 I have a 1965 B613 with tandem 4.17 axles. I'am installing a 28' jer-dan rollback, I plan on taking it to shows up and down the east cost while hauling antique tractors or small dozers. it has a 673 turbo with a triplex. with this extensive restoration I'm considering if I should repower. I have a 237 maxidyne with 5 speed and also a few dt466s. with fuel prices being so high I'm wondering witch might be the right choice. any thoughts would be appreciated. Quote Link to comment Share on other sites More sharing options...
Bobby Covert Posted February 4, 2013 Share Posted February 4, 2013 I have a 1964 B615. It has a 237 Maxidyne under the hood. I did not do the mechanical work, but I can tell you it is very tight. You can't get your little finger in between the radiator and the front harmonic balancer. Quote Link to comment Share on other sites More sharing options...
realwolfdaddy Posted February 5, 2013 Author Share Posted February 5, 2013 thanks I've heard its a tight fit. Have you ever checked the fuel milage? and what transmission did you use? Quote Link to comment Share on other sites More sharing options...
2stacksuperdog Posted February 5, 2013 Share Posted February 5, 2013 Your better off with 237 Quote Matt Link to comment Share on other sites More sharing options...
GreenGiant2 Posted February 5, 2013 Share Posted February 5, 2013 dont use a dt 466 you wont be happy Quote We the unwilling, Lead by the unqualified, are doing the impossible, for the ungrateful. Link to comment Share on other sites More sharing options...
realwolfdaddy Posted February 5, 2013 Author Share Posted February 5, 2013 The dt466 just doesn't have enough torque I'm afraid. Quote Link to comment Share on other sites More sharing options...
Bigdogtrucker Posted February 5, 2013 Share Posted February 5, 2013 What's wrong with the 673T/triplex? Quote Link to comment Share on other sites More sharing options...
2stacksuperdog Posted February 5, 2013 Share Posted February 5, 2013 What's wrong with the 673T/triplex?I was just gonna say that! Quote Matt Link to comment Share on other sites More sharing options...
realwolfdaddy Posted February 5, 2013 Author Share Posted February 5, 2013 (edited) Nothing wrong but my dad had a manager that use to own a mack dealership in GA He came home from a Carribean cruise in the 60s to find 75 b61s with 711s that customers had return because of head gaskets . He later lost his dealer and everything he owned but a new yorker car . I know 673 aren't 711 but did they have any problems? Edited February 5, 2013 by realwolfdaddy Quote Link to comment Share on other sites More sharing options...
umodelnut Posted February 5, 2013 Share Posted February 5, 2013 The 673 with the turbo I think would be fine, but if your looking to put another motor in it you should go with the 237. Durable motor, almost bullet proof. Hahah. It really is a good motor. Quote Link to comment Share on other sites More sharing options...
Bigdogtrucker Posted February 5, 2013 Share Posted February 5, 2013 If that engine runs good,i wouldn't touch it. 1 Quote Link to comment Share on other sites More sharing options...
Brian Blaylock Posted February 5, 2013 Share Posted February 5, 2013 Unless the 673 that is in your truck now has a problem I would leave it in their however if you would decide to swap it out for a 237 you will have a little more room under the hood than a B-615 does because your cab has an indentation in the firewall and the B-615 is straight on of the differences between the inline six and the V-8 cabs Quote Link to comment Share on other sites More sharing options...
Maddog13407 Posted February 5, 2013 Share Posted February 5, 2013 237 is a ''fuel pincher'', that was their trademark. they will fit right in where the 673 is without a problem at all. just have to use the 673 pulleys and crank hub. turbo placement is different to. the old 673's usually had a huge old switzer turbo and took up alot of room. the 237's had a smaller turbo so you might have to change the plumbling a little. other than that its an easy swap. you will have to make up mounts to put the 5 speed in it. the triplex will work fine also as long as you dont lug the hell out of it .the 673 turbo was not a 711. the early 711's did have head gasket problems but most were fixed with addin a turbo or the addition of fire rings and the Maxidyne head gaskets like mine has. 1 Quote Link to comment Share on other sites More sharing options...
realwolfdaddy Posted February 5, 2013 Author Share Posted February 5, 2013 (edited) Thanks maddog. Was it lugging or too hot operation is that what was killing the 711s? Edited February 5, 2013 by realwolfdaddy Quote Link to comment Share on other sites More sharing options...
yarnall Posted February 5, 2013 Share Posted February 5, 2013 If you do take out the ENDT673 I might want to buy it. My H613 doesn't have a turbo anymore and I would like it to. I have no answer for your questions though.Thanks,Mike Quote Link to comment Share on other sites More sharing options...
57 bcr Posted February 6, 2013 Share Posted February 6, 2013 I have a 237 for the BCR,just in case it's END673D W/aftermarket turbo should ever quit.Probably won't ever need it! (I hope) 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 Share on other sites More sharing options...
Gmerrill0516 Posted February 6, 2013 Share Posted February 6, 2013 If it aint broke don't fix it. Run the one you have unless it's puking oil or something. That drive line should be just fine. I doubt the mileage will be that much different unless you are driving the crap out of it, it will not save you much.I didn't know cab structure changed relative to 6's vs V8's. I've got an E6 turbo (250 I'm told) in mine and it fits fine. If I could come with a good 864/865 to trade the E6 for it I'd change it out but the V8 is kind of special for the 815. Otherwise I'm planning to run it as is.Good luckGreg Quote Link to comment Share on other sites More sharing options...
Freightrain Posted February 6, 2013 Share Posted February 6, 2013 I run the wheels off my 673P. In the 10 yrs, only popped two head bolts(easy fixes), drove it home each time. They are sturdy ol engines. Mines all original, so who knows the actual mileage? Geared right, it will run along at 65-70 mph and get 8-9 mpg easy if you aren't heavy.That lil binder motor will be running hard to keep up, they just don't make the torque.I'd LOVE to have a 250 motor in my truck. She'd be cruis'n in high cotton then! Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment Share on other sites More sharing options...
realwolfdaddy Posted February 6, 2013 Author Share Posted February 6, 2013 finally the answer i wanted thanks. I just didn't finish and regret changing the engine. would love to be getting that kind of mpg Quote Link to comment Share on other sites More sharing options...
Freightrain Posted February 6, 2013 Share Posted February 6, 2013 I can bobtail and get 9-10 mpg. With trailer and running hard it gets 8 mpg, as I run it 65+ on the highway(about 1800 rpm). I have 4.10 gears and triplex. I have a brownie box too, but don't run it in OD very often(usually in Direct) so it doesnt account in the fuel mileage equation. Truck is 13K, the trailer is 14K lbs. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment Share on other sites More sharing options...
fifth wheel Posted February 6, 2013 Share Posted February 6, 2013 Thanks maddog. Was it lugging or too hot operation is that what was killing the 711s?The bigger bore, combustion to close to the water holes. Mack gave you the aluminum plugs for the close water holes and new gaskets worked.FW Quote Link to comment Share on other sites More sharing options...
realwolfdaddy Posted February 6, 2013 Author Share Posted February 6, 2013 I can bobtail and get 9-10 mpg. With trailer and running hard it gets 8 mpg, as I run it 65+ on the highway(about 1800 rpm). I have 4.10 gears and triplex. I have a brownie box too, but don't run it in OD very often(usually in Direct) so it doesnt account in the fuel mileage equation. Truck is 13K, the trailer is 14K lbs.Thats great I dont get that much with my duramax pulling that kind of weight Quote Link to comment Share on other sites More sharing options...
JTFormula Posted February 6, 2013 Share Posted February 6, 2013 I agree, I think the a,punt of work effort and money invested for the engine swap vs the gain is not worth it. You should be fine as this sounds like its more of a hobby truck than a daily working truck. More importantly, what is the wheelbase on your truck for that rollback and please post pictures. You are building the same thing that I want to do. Old B Mack with a rollback! Quote ~ JT Burkard ~ AKA Sweaty Mackwww.jtresto.com www.wickedreputation.netwww.jonathanthomasmotorcars.com Link to comment Share on other sites More sharing options...
leversole Posted February 6, 2013 Share Posted February 6, 2013 If it aint broke don't fix it. Run the one you have unless it's puking oil or something. That drive line should be just fine. I doubt the mileage will be that much different unless you are driving the crap out of it, it will not save you much.I didn't know cab structure changed relative to 6's vs V8's. I've got an E6 turbo (250 I'm told) in mine and it fits fine. If I could come with a good 864/865 to trade the E6 for it I'd change it out but the V8 is kind of special for the 815. Otherwise I'm planning to run it as is.Good luckGregCab is the same, the floor is different...the steering box had to be moved back. In My 615 the steering wheel is much more upright than a regular B-Model.. Quote Link to comment Share on other sites More sharing options...
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