'89 Wrangler YJ Mercedes Diesel Swap OM 617 - My First Swap - Page 3 - Jeep Wrangler Forum
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Old 05-16-2013, 07:29 AM   #61
snowbrd84's Avatar
Join Date: Apr 2012
Location: Bethesda Maryland
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Originally Posted by mattchatman View Post
Exciting! Let me know how that tech adapter works for you! I finally got my computer working so it's time to get some factory gauges working instead of GPS speedometers and old Mercedes gauges in the floorboard.
Ill let you know how it goes, if I get off work with daylight left, I am gonna try and get it installed today. I highly recommend getting a boost controller and egt gauge. runs much better at 14 psi.

"Why do it right when you can just do it!" Me
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Old 05-20-2013, 10:01 AM   #62
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The girlfriend was in NY for the weekend, so I spent pretty much the entire weekend working on the Jeep.

I got the Dakota Digital tach adapter installed, very simple to install. I am a bit dissapointed in that I emailed Dakota Digital and they told me the tach adapter would work with the hall effect sensor. Well, it did not. The tach was bouncing all over the place with the hall effect, and no where near accurate. No big deal really, just means I had to run it off the W-terminal on my new alternator (stock alt for the OM617 does not have a W-terminal unless you add it yourself). I wanted to use the hell effect because that would mean no calibration necessary. Hooked up to the w-terminal, I have it reading about 600 RPM at idle, which is not correct, but I ordered a laser photo tach reader for $16 off Amazon, should get here today and then I can calibrate the tach. I am considering printing a new gauge face label for the tach though, since the stock gas tach has a much wider RPM range that is not needed with the OM617.

I also did some major re-wiring which I will add pics of tomorrow. Finished moving the battery from the engine compartment to the bestop rough rider storage box on the passenger rear wheel well, abandoned my idea of using a fuse box in the engine bay, and just re-did all of the wiring. It came out really nice I think, it is by far the cleanest wiring job I have EVER done. With all the space I gained by removing the battery tray, I ran the intake into that area.

Previously, I had the oil cooler mounted on the driver side front fender well in the engine compartment. I decided to attach it to the connecting support rod that goes from the firewall to the grill, right in between the brake booster and the grill. This gets it off the fender and lets it cool on all sides. It also looks a lot better.

Put in a lot of work on the interior wiring and installed some red indicator lights on the dash, one for the glow plugs and one for the EGT warning light. I also bought a 12v buzzer alarm, this will wire in with the EGT warning light. The digital EGT gauge has an adjustable warning level, you set what temp you want it to go off at, and it will trigger the light and buzzer. That way if you hit 1200 deg or so on the EGT, you will know it and not destroy the engine. I want to get an oil pressure switch and wire it up to the vacuum switch that shuts off the engine as well, that way if something goes and I lose oil pressure, it will cut the engine before it destroys itself.

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"Why do it right when you can just do it!" Me
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Old 05-28-2013, 11:50 PM   #63
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So, all-in, what was your final cost on the swap?
"But why, some say, the moon? Why climb the highest mountain? Why fly the Atlantic? Why does Rice play Texas? We choose to go to the moon. We choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard."
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Old 05-29-2013, 10:05 AM   #64
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Spent around 2000 in parts total, but I sold the old engine and parts for a total of 1150. So only really cost me less than a grand...
"Why do it right when you can just do it!" Me
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Old 05-30-2013, 09:22 AM   #65
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Awesome build man
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Old 10-07-2013, 12:27 AM   #66
Join Date: Feb 2013
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just wondering were you got you new monark nozles?
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Old 10-08-2013, 11:30 AM   #67
Join Date: Jul 2011
Location: Monument, CO
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You mentioned you replaced the rear axle with a Ford 8.8 with 3.73 gears. Did you replace the front axle gears with 3.73's?
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Old 10-08-2013, 03:27 PM   #68
Join Date: May 2013
Location: West Michigan
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I read this entire post with fascination. What a great build!
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Old 10-08-2013, 06:20 PM   #69
Join Date: Dec 2011
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Read this thread twice now! It was out standing, like to see what you could have done with a space shuttle down here at NASA! LOL
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Old 10-10-2013, 10:51 PM   #70
Join Date: Aug 2013
Location: hedgesville,wv
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Best to you on this diesel project. A fellow at the Ocean City event had a diesel conversion ( 4 cyl. Cummins I was told), that got a lot of attention. I have high regard for you guys that can pull this off.

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