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I have been toying witht the idea of repowering an xm708 chassis with a turbo diesel. I may have found one of the 3.7 turbo diesels decently priced. Does anybody have first hand knowledge of these engines besides paul at mars ? I was wondering if an 3053 od tranny would bolt up. It is currently set up fro a turbo 400 so a chevy tranny is an option but really would like an od tranny. any suggestions ??? I know it is sacriledge to power a rare truck but it has been parted already non original bed no hydraulics. essentially just a m37 with heavy springs and xm708 data plates now.
thanks
ed
hercules 4 banger possibility
Moderators: Cal_Gary, T. Highway, Monkey Man, robi
I would think that the parts problem with a Hurk diesel and the labor involved to due the swap you would be a lot better off with a 4bt cummings. I have had a lot of equipment with the hurk. diesel, just hated it when a waterpump was 500.00 or more and weaks away, and no parts a napa...Phil in Mt 
Phil in Mt
41 m2-4, 42 m6, 42 g-506, 42 mb, 43 mb, 44gpw, 50 m38, 50 m75, 51 m38, 51 m37 halfbreed ,55 m38a1, 60 m170
62 m100, 69 m416
41 m2-4, 42 m6, 42 g-506, 42 mb, 43 mb, 44gpw, 50 m38, 50 m75, 51 m38, 51 m37 halfbreed ,55 m38a1, 60 m170
62 m100, 69 m416
Ed -
I'm starting a GM 6.2 swap in my M37, with the plan of installing a 3053A behind the diesel, using a Chevy C60/366-427 13" flywheel & bellhousing/adaptor plate combo. The 6.2 engine I'm using originally had a TH400 Chevy bellhousing trans mounted to it, so it's POSSIBLE that the same bellhousing & adaptor ring would mount to the Hercules motor. But I couldn't say with any certainty that the GM 13" flywheel would bolt to the Herc motor...
HTH, (somewhat...)
Bryan in NC
I'm starting a GM 6.2 swap in my M37, with the plan of installing a 3053A behind the diesel, using a Chevy C60/366-427 13" flywheel & bellhousing/adaptor plate combo. The 6.2 engine I'm using originally had a TH400 Chevy bellhousing trans mounted to it, so it's POSSIBLE that the same bellhousing & adaptor ring would mount to the Hercules motor. But I couldn't say with any certainty that the GM 13" flywheel would bolt to the Herc motor...
HTH, (somewhat...)
Bryan in NC
thanks guys
Bryan and phil
thanks for the info. I am torn I lost a 4bt a few months ago running driving step van for $1300 didn't have the cash so I had to pass it was a t19 4 spd truck. aluminum body was worth half that amount kick my self every day. I am on the prowl but whenever you have the green the trucks don't pop up like that one did.
thanks
again
ed
thanks for the info. I am torn I lost a 4bt a few months ago running driving step van for $1300 didn't have the cash so I had to pass it was a t19 4 spd truck. aluminum body was worth half that amount kick my self every day. I am on the prowl but whenever you have the green the trucks don't pop up like that one did.
thanks
again
ed
I looked at the Hercules before I did my Cummins swap... At the time, MARS had just run out of engines due to Hercules entering receivership...
Hercules:
One of the things that bothered me about the Hercules even before they admitted that they couldn't supply me with an engine was the lack of parts availability. Filters, belts, etc. can be had at any decent parts store (although you may have to order them), but other parts seemed harder to source. There are very few Hercules powered trucks/equipment in my area that I know of.
Later on, while talking to Charles at M Series Rebuild (he installed one of the first, if not the first, Hercules repowers in a M37 for the US Market) and drove a Hercules powered M37 for years as his shop truck, it now has a Cummins in it...) was that he found that the engines routinely were excessive oil users...
Cummins:
I spot these all over the place in both vehicles such as FedEX, UPS, Frito Lay, and other route vans as well as in construction, agriculture, and farm equipment in my area. I can through a rock out my office door and hit five dealers that have Cummins powered equipement on the yard and parts on the shelf. Fiters, belts, and other such parts are on the shelf at my local auto parts store. And I'm not even considering that a lot of the parts on a 4BT are identicle to those on a 6BT and thus are avaiable through the Dodge dealers since the larger engines are in Dodge trucks (also Thomas built schoolbuses and similar on Frieghtliner Chasis...). The engines, literally, are made and used wordwide.
The Cummins turns a little slower in stock trim, but you can change out the governor spring if it bothers you. It puts out a bit more torque and they don't burn a lot of oil (or at least, I can't find anyone who claims that it is something that they have experienced on a widespread basis...). It's a heavy duty engine throughout.
Others:
In a nutshel, I also looked at GM power, John Deere, and Perkins, but liked the Cummins better for reasons of costs (initial and operating), power, availabilty, etc...
From your end, a good deal on a Hercules that is in good shape might still be the way to go. I'd consider doing one if I found a good swap candidate, but since I have a bunch of Cummins powered equipment in the yard (including a M37), I also have to factor in my own pars supply (comonality) and prior swap experience and thus would likely trade the Hercules and install a Cummins if it was my truck.
As I work on my own XM708, I keep thinking about what a screamer it would be with an ISB3.9 Cummins, but I have a fresh rebuilt 230 for it and am keeping it stock. Thanks Ed
Hercules:
One of the things that bothered me about the Hercules even before they admitted that they couldn't supply me with an engine was the lack of parts availability. Filters, belts, etc. can be had at any decent parts store (although you may have to order them), but other parts seemed harder to source. There are very few Hercules powered trucks/equipment in my area that I know of.
Later on, while talking to Charles at M Series Rebuild (he installed one of the first, if not the first, Hercules repowers in a M37 for the US Market) and drove a Hercules powered M37 for years as his shop truck, it now has a Cummins in it...) was that he found that the engines routinely were excessive oil users...
Cummins:
I spot these all over the place in both vehicles such as FedEX, UPS, Frito Lay, and other route vans as well as in construction, agriculture, and farm equipment in my area. I can through a rock out my office door and hit five dealers that have Cummins powered equipement on the yard and parts on the shelf. Fiters, belts, and other such parts are on the shelf at my local auto parts store. And I'm not even considering that a lot of the parts on a 4BT are identicle to those on a 6BT and thus are avaiable through the Dodge dealers since the larger engines are in Dodge trucks (also Thomas built schoolbuses and similar on Frieghtliner Chasis...). The engines, literally, are made and used wordwide.
The Cummins turns a little slower in stock trim, but you can change out the governor spring if it bothers you. It puts out a bit more torque and they don't burn a lot of oil (or at least, I can't find anyone who claims that it is something that they have experienced on a widespread basis...). It's a heavy duty engine throughout.
Others:
In a nutshel, I also looked at GM power, John Deere, and Perkins, but liked the Cummins better for reasons of costs (initial and operating), power, availabilty, etc...
From your end, a good deal on a Hercules that is in good shape might still be the way to go. I'd consider doing one if I found a good swap candidate, but since I have a bunch of Cummins powered equipment in the yard (including a M37), I also have to factor in my own pars supply (comonality) and prior swap experience and thus would likely trade the Hercules and install a Cummins if it was my truck.
As I work on my own XM708, I keep thinking about what a screamer it would be with an ISB3.9 Cummins, but I have a fresh rebuilt 230 for it and am keeping it stock. Thanks Ed
'53 USMC M37 w/Cummins 4BT
'64 XM708,
'51 M38
'73 M817, '71 XM813, '70 M816, '84 M931
http://www.garbee.net/~cabell
http://www.eastcoastconvoy.com
http://www.gravesmountaintrailrides.com
'64 XM708,
'51 M38
'73 M817, '71 XM813, '70 M816, '84 M931
http://www.garbee.net/~cabell
http://www.eastcoastconvoy.com
http://www.gravesmountaintrailrides.com
thanks cabell
Thanks for the info. I would keep the xm708 stock but it has been cannabililized already. The original bed is in oklahoma and the truck is in vermont. The hydraulics at least the original stuff is non existant. It is pretty much cab and chassis. there is a pic in the registry of it. I appreciate the help cabell. If you run across a stepvan relatively cheap $2,000 or less give me a hollar.
thanks
ed
thanks
ed