Brought this home yesterday

[Ronbo]

Why did I buy it??? I dono?? ... It seemed like a good deal , yet not...$500.00 engine pulled - loaded, with everything but he turbo and starter...13K miles , clutch included..also the hood ( almost perfect ) very thin paint easy to paint gloss black, .. That means every body part I have in near perfect except the Roof...
Can some one tell me by looking at the injection pump etc if its a multi-fuel? It just looks funny with the line looped at the rear of the pump....
anyhow the engine is now snuggled nicely in my shop on a motor crate covered .... Later Me

 

[Ronbo]

OOPs forgot pictures Duhhuh

 

[Recovry4x4]

Density compensator looks to be bypassed but it's still a multifuel.

 

[Ronbo]

OK Humm Mine in the truck says Multi fuel on the engine plate , Yet does not look like this on the pump.. This plate just has some numbers m & dated 1970..
I took the air pump off to put on my truck then ended up fixing mine ( stuck upload vavle) so put the pump back on this one in the picture.... It runs really well... Thanks for the info.

 

[Ronbo]

PS Looking your reply, since the density comp. thingy is by passed , is there a need to put it back? hard to do? parts available? reason they bypassed it? thanks

 

[vtdeucedriver]

Govt came out and took the density compensators off the pump. they would then stick a decal on the motor saying diesel fuel only. so no there is nothing wrong if your going to run just diesel, just no car gas like a true multifuel. it just does not have the option any more.

 

[Big Mike's Motor Pool]

its still multifuel even with the compensator bypassed. multifuel capability lies in the design of the pistons. the density compensator just makes the engine get the most power from different fuels.

 

[gimpyrobb]

Ron, the motor itself is multifuel. The fdc is just a way to keep power output the same with different fuel types.

 

[Ronbo]

OK , Cool I do understand , But then I ask , why would they take the fdc off ? Emissions?

 

[Ronbo]

PS are all M-35's multi fuel? if not ,could someone put a multi fuel pump on an non multi fuel engine, and cause a huge problem? Sorry for the dumb questions?

 

[gimpyrobb]

Yes, putting a multifuel pump on a gas motor would cause a slight problem(there is gas m35s). I don't know for sure why they started bypassing the fdc, but would suspect they never needed that feature(and putting it back in the loop is easy). Also, some here have found that a worn fdc can allow fuel into the crankcase oil, aVERY bad thing to have happen.

 

[DDoyle]

Bypassing the FDC eliminated the possiblity of an internal FDC leak allowing fuel to dilute the crankcase oil. It also allowed them to optimize the vehicles fuel economy. As the Army is now supposedly a single-fuel army, this in theory eliminated the need for a multifuel engine.

All true M35s are gas - the M35A1 and M35A2 were built with Multifuel engines, the M35A3 has a true Diesel. As others have said, the piston/combustion chamber design is what make the engine a multifuel - in fact the first Multifuels (LDS-427) did not have fuel density compensators) Bypassing the FDC doesn't undo the ability to burn other fuels, BUT the adjusting of fuel delivery rates and timing that was done at the same time as the bypassing does.

HTH,
David Doyle

 

[vtdeucedriver]

Govt came out and took the density compensators off the pump. they would then stick a decal on the motor saying diesel fuel only. so no there is nothing wrong if your going to run just diesel, just no car gas like a true multifuel. it just does not have the option any more.

Wow i phrased that badly. What DD posted above is right. With my deuces, all 3 had the compensator still installed. I often considered taking them out myself since thats all I ran was diesel. I made sure that when I checked and changed the oil that it looked ok.