Default 1983 CJ7 Mercedes Turbo Diesel Conversion 

Old 11-20-2012, 10:45 PM   #1
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Hey there everyone, new here and new to the Jeep scene. I'm 18, and have been working on anything mechanical since I can remember. Learned from my dad, and then took it a step further and taught myself from reading forums, book, and anything I could get my hands on. It's my passion.

The Jeep was purchased a long time ago, along with the fiberglass tub, fiberglass tailgate, offy intake, holley carb and new springs, axle rebuild, poly mounts, ect. Unfortunately interest was lost, and it sat until this summer when I decided I wanted the old CJ to be mine.

I assembled the 258, got the tub on and cut out, axles under it, engine in, nutter bypass completed, tranny and tcase in, tank under it, ect. Got it to fire, discovered a million problems, and kept throwing money and parts at it until all of the broken stuff was replaced or rebuilt




Took it for a drive around the yard, parked it, and stood back: I didn't like what I saw. It was too common, everyone has a 258, carbed, intake/headers, blah blah blah
So out the 258 came for the final time, and in its place went a 1985 Mercedes 300D inline 5 cylinder turbo diesel (OM617). 20hp more than the 258, but due to having a short stroke and 3L of displacement it has 30ft/lbs less torque (more on this later.)







I made the mounts, wiring, controls, ect myself, and the engine to bellhousing adapter was sourced through merceded 4x4. The engine bolts right up to the t4 and uses the jeep flywheel, clutch, pressure plate, ect. I adapted the oil pressure sensor to the engine, along with water temp probe so the jeep sensors are also used. I got the glowplug wiring in, cooling system adapted, and oil pan notched. Started the engine, and all I can say is AWESOME












Final assembly followed. I opted for twin electric fans (3100CFM), an aluminum radiator, and a big 10 row oil cooler for the engine. It runs nice and cold. I've got a few hundred hours into the Cj so far, but it's worth it all! All done by me, and with all my own money.

I've licensed it, and took it out on the road, and this diesel has WAY more torque off the line and throughout the entire rpm range, a LOT more. It keeps pulling! The 258 must get it's numbers from some peak in the rpm curve. The CJ can really accelerate now. Still waiting on MPG numbers, and I need to regear from the 2.73's I currently have, which are way to tall for the 33's I have on it. 3.73's would be a lot better, but I'm broke so I have to roll with what I have for now.

I still need to build a rear bumper, tank skid, some exhaust stuff, get a new fuel gauge, seal some doors up and drive the wheels off it!

Let me know what you think! And thanks for reading!

 

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Default Re: 1983 CJ7 Mercedes Turbo Diesel Conversion 

Old 11-21-2012, 06:51 AM   #2
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I think that @ 18 years young you do excelent work and have a great imagination!

You should be very proud of your CJ. I have a feeling that one piece axles will be in your very near future though...
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Default Re: 1983 CJ7 Mercedes Turbo Diesel Conversion 

Old 11-21-2012, 09:30 AM   #3
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an 85 Mercedes Diesel WOW HELLA NICE WORK and your CJ looks great Welcome aboard
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Default Re: 1983 CJ7 Mercedes Turbo Diesel Conversion 

Old 11-21-2012, 10:23 AM   #4
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One piece axles and trussing are on the to-do list! A few says ago my dad BURIED his tractor in mud out in the woods and was convinced we'd need a bulldozer to pull it out. Mud was up to the axles, and the tractor had bottomed out on its belly. He said there was no way for me to get back there (a challenge right!?) I actually was able to crawl back between the trees, it was so narrow I had trees rubbing down both sides of the tub and top, mirrors were folded in. I was able to get a strap on him, and gave it everything I had, and amazingly pulled the 3000 some pound tractor out (with woodsplitter and loader on.) I was impressed! I actually was dragging him back until the ground was solid enough to get him up on land. Diesel saved a diesel!

 

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Default Re: 1983 CJ7 Mercedes Turbo Diesel Conversion 

Old 11-21-2012, 10:26 AM   #5
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First run: Mercedes OM617 5 Cylinder Turbo Diesel Jeep CJ7 Conversion - YouTube
Quick run down the road: Short Clip Of Mercedes Turbo Diesel Conversion CJ7 Jeep - YouTube
Walk around: Walk-around 5cyl Mercedes Turbo Diesel CJ7 Jeep Swap - YouTube

 

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Default Re: 1983 CJ7 Mercedes Turbo Diesel Conversion 

Old 11-21-2012, 11:51 AM   #6
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awesome ride and amazing way to work a diesel in to the cj
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Default Re: 1983 CJ7 Mercedes Turbo Diesel Conversion 

Old 11-21-2012, 01:59 PM   #7
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Good job on the Jeep I really like it you are wise beyond your years.
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Default Re: 1983 CJ7 Mercedes Turbo Diesel Conversion 

Old 11-21-2012, 07:25 PM   #8
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Woah, that is pretty cool! Definitely a different idea than most. Very nicely done. Have any 258 parts you want to get rid of?

 

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Default Re: 1983 CJ7 Mercedes Turbo Diesel Conversion 

Old 11-21-2012, 08:16 PM   #9
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Quote:
Originally Posted by diddy2003 View Post
Woah, that is pretty cool! Definitely a different idea than most. Very nicely done. Have any 258 parts you want to get rid of?
What are you looking for?

 

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Default Re: 1983 CJ7 Mercedes Turbo Diesel Conversion 

Old 11-21-2012, 11:15 PM   #10
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Quote:
Originally Posted by mtnwhlr View Post
What are you looking for?
I would be interested in the Offy intake if it will work with the Hedman header I just bought. If they are the same thickness where they mount to the engine. What else do you have? Send me a pm so I don't cludder your tread. Thanks.

 

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