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1979 Dodge Diesel

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  #1  
Old 08-27-2013, 11:45 PM
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Default 1979 Dodge Diesel

I am in the middle of buying a 1979 Dodge truck with the rare mitsubishi diesel. I don't see much information anywhere on these engines. Does anyone know a good source for mechanical information and what are some problem areas?

thanks!
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  #2  
Old 08-28-2013, 12:04 AM
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Sorry I can't be of any help, I do not know of any places where you can get information on it, you might have to scour the web for an applicable forum for that kind of info.
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Old 08-31-2013, 12:02 PM
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Well I bought it. It was actually a 1978. There is hardly any rust. The problem is it uses more oil than it does diesel. I don't think it burns much but just simply leaks out. Anyway, now the quest to find parts...eek
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Old 08-31-2013, 04:56 PM
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How's it run? I know they aren't anything like a modern diesel, but can it at least get out of it's way?
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  #5  
Old 08-31-2013, 05:27 PM
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tell you the truth you may want to talk with the guys on ramchargercentral.com. there is lots of diesel guys over there that might be a bit more helpful with this engine.
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  #6  
Old 08-31-2013, 11:33 PM
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Even then, there isn't much info on RCC. Mad Max on there had two for sale and I intended to buy one (engines only) but decided against it since I didn't have a truck for it.

There is minimal info on them, yes it's a 78, I don't believe it was offered later. It'd be cool to have one just to say you did.
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Old 08-31-2013, 11:38 PM
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there is more guy on RCC that would have info on it than the guys that hang around here. i know RCC is one of the most active forum for 93 and older dodge trucks that i know of. most 1st gen sections on dodge truck forums are usually pretty dead.
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  #8  
Old 09-01-2013, 01:18 PM
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Hmm...well it runs. You have to plan pretty far ahead for just about everything. Brakes suck. But it's 0-60 is, no lie, about 2 minutes. Car coming? Yes. How far? Quarter mile. That's too close.

It's interesting. Love the body style. It gets about 25 mpgs. But that was my highway only trip home. It rolls coal constantly. It was funny for the first mile or so but it's rather annoying now. People next to the tail pipe get super pissed. And it uses more oil than an Iraqi oil field.
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Old 09-01-2013, 01:31 PM
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the brakes not working that great could be lack of maintenance or possibly just how they are designed since i know most diesels don't have a vacuum source and usually have a vacuum pump.

if you are constantly rolling coal maybe someone has adjusted something too far. maybe it could use a turbo?
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Old 09-01-2013, 03:47 PM
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Very true, RCC is a great place with a lot of info available.

Tom, any way you could grab some vids of the truck, maybe idling and driving?
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  #11  
Old 09-01-2013, 10:03 PM
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Yeah, I will see about some pictures and videos. It idles fantastic and tarts right up every time. I am pretty confident it was used as a farm truck. I am the third owner. The previous bought it in 1989 and drove it back from Georgia. (I live in St Louis) All the lights were out. In fact I was driving it home and got pulled over for no lights. I showed the cop that I just bought it and he let me go.

And since it was most likely a farm truck it explains the brakes being totally neglected. However, it has basically no rust. It is dented here and there and the interior is shot but it is solid enough to be something to work with.

So why did I buy it? It was cheap and unique...and that is about it. I was told not to bother hauling anything with it as it has no power. And they were right! Its pedal to the floor all the time.

Thanks for all the help guys. Its been an interesting last couple days.
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Old 09-01-2013, 10:06 PM
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so all the lights were out? should have hot wired them.

i am not a diesel guy but a turbo might help out with power problem.
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  #13  
Old 09-01-2013, 10:34 PM
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Hahaha. That sounds fun, at least for a while. Somebody's got to have turned the fuel delivery up, maybe to cover up a hard-start issue, or low compression, or just to have fun and blow smoke.

I just obtained a copy of the 1971 to 1978 chilton's truck and van repair manual.

From the chilton's manual

Tuneup Specs
Injection pressure 1705 PSI
Pump type Bosch PES6A65B
Injection timing 18 Degrees B [before top dead center?]
Idle Speed 550-600 rpm
Valve clearance intake .012c
Valve clearance exhaust .012c
Compression pressure 426 PSI 170 RPM

General Engine Specs
Model 6DR50A
Cyl-Displ. Cu. In. 6-243
Bore x Stroke 3.62x3.94
Horsepower 100@3700 rpm
Torque (ft lbs) 163@2200 rpm
Firing order 153624
compression ratio 20:1
oil pressure at 2000 rpm 42-71psi

Lubrication System
Pump: Trochoid
Pan capacity 7 qts
Filter capacity 2 qts
idle pressure 21 psi
API requirement SE/CC

Cooling System
capacity 13 qts
pump type: centrifugal
thermostat 185 degree F
fan ratio 1.07:1 [what's the point?!?!]
cap pressure 7 lbs

Electrical System
battery type 2-12 volt
battery amp 70 each
alternator 60 amp
glow plugs 10.5v, 8.3 amp

Fuel System
timer: centrifugal
cam lift 0.315"
Delivery valve diameter 0.236"
plunger lead 0.591"
plunger diameter 0.256"
governor type: RU
feed pump cam lift 0.236"
nozzle diameter 0.039"
spray angle 4 degrees
holder type: KC

Other stuff I gleaned from the next two pages
Clean air filter every 6,000 miles
Change air filter every 18,000 miles
Clean wire gauze fuel filter every 12,000 miles
Inspect paper fuel filter every 12,000 miles
Replace paper fuel filter every 24,000 miles
Change oil every 6,000 miles or 6 months
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  #14  
Old 09-02-2013, 10:49 AM
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Wow thanks a lot for that! Does the manual tell you how to work on other diesel related thing? Particularly the injection pump?

100 hp....oh brother. My 2000 Jetta produces 90. I need something with real power.

Got all the lights working. Seemed to be just bad grounds. Tightened them down and all is good...yet very dim.

None of the gauges work inside. That is something more dodge related that I am sure I could fix with info from this site. Also you can control the idle from inside the vehicle. There is a little **** you turn. I guess for cold temps. I didn't figure it out at first and it was idling super high. Shifting into drive cause a massive jerk. Well I lowered the idle and all is well. Crazy how this thing just works. Everything unnecessary can be broken and it still fires up.
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Old 09-02-2013, 07:12 PM
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It doesn't tell you much else in that section. This book was actually written as the engine was just on the verge of being released. There is a little bit of general info on the injection pump. Its a bosch, made by nippondenso. From my experience with diesels, you can generally turn the pump much like a distributor to adjust the timing. Changing the amount of fuel may be more complicated. I can't even find out if there is an external adjustment.
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  #16  
Old 09-02-2013, 10:37 PM
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How about some pictures? Also check and see if you can adjust the valves, or does it have hydrolic valves? My Mercedes 190D has a bosh injector pump also, and to adjust the timing you turn the whole pump.

Last edited by 04 Diesel; 09-02-2013 at 10:41 PM..
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Old 09-04-2013, 12:19 AM
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pic indeed.

I didnt even know dodge ever offered a diesel before the cummins. Thats awesome.
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Old 09-04-2013, 12:24 AM
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^It was in response to the 70's gas crisis.

Problem is, they rushed it to market and diesel already had a bad rap at the time.
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  #19  
Old 09-05-2013, 12:47 PM
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She isn't pretty but I like it.



m/user/tomd911/media/image1_zpsb1bdda3d.jpeg.html][/URL]

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  #20  
Old 09-05-2013, 12:48 PM
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