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Old 06-06-2008, 06:59 PM
Join Date: Feb 2008
Posts: 42
motor/trany swap HELP!!!

Ok so I put a 1983 Mercedes 300SD drive train into my Jeep:

The problem....No power!!! When it was in the car it had power could cruise all day at 70mph.

First the truck weight about = to the car (estimate less then 4,000lbs)
Gear ratio 4.11 with 32 inch tires should turn 2,700rpm at 62.5mph (100km/h)

here is the problem I have no power at all. I can get 50mph on flats and no power on hills.

It has the electronic automatic... I realized I do not have the electronic pressure control rigged up (think I left the part on the car that was scrapped due to rust).

So any ideas on how to rig the pressure control or set to full throttle since that seems safer then no throttle setting.

what other issues could I have?

I have a 2-4lbs lift pump at the tank to the injector it goes through new filters (2 before lift pump and stock filters at motor all new). Motor starts no problem with or without glow plugs (factory relay wired in). Engine burns clean no black smoke.

Since it all worked in the car I want to get back to it running that way before I adjust the injector pump or anything.

I am now living in the truck in the bush collecting field data for my graduate studies so it will be a week or so till I can check here. but help is needed.

Basically I was going up 6-7% grade (10mile climb in low range on the transfer case engine, no power 10mph and temperature started climbing from 190 to 220 so I shut it down and got towed (550.00 dollars later). Now I am in the bush but need to get it running....Help please!!

Thanks David

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Old 06-06-2008, 07:05 PM
winmutt's Avatar
85 300D 4spd+tow+h4
Join Date: Apr 2006
Location: Atl Gawga
Posts: 9,332
Boost? Linkage? Are you hitting full stop on the IP?
1987 300D Sturmmachine
1991 300D Nearly Perfect
1994 E320 Cabriolet
1995 E320 Touring
2001 Eurovan FOR SALE
1985 300D car, sold and missed.
OBK #42
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Old 06-06-2008, 07:17 PM
bgkast's Avatar
Rollin' on 16s
Join Date: Dec 2005
Location: Vancouver WA
Posts: 6,528
I bet the ALDA did not get connected to properly in the swap and is not getting the boost signal.

Post pictures of this thing!
1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine
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Old 06-06-2008, 07:55 PM
Join Date: Feb 2008
Posts: 42
ALDA??? What is that..

I have all the original equipment on the motor except took off cruise control and the rod that went to the fire wall (thinking now it had an electronic throttle position for the tranny??)

Copied the vaccum line pages and going to go through them....

IP opens full I have a cable pulling the old cruise control linkage. I am off the the bush tonight...

Here are some photos I will add new ones with the camper once I down load my camera. I will be off email for a week so please reply and I will check. The Jeep is now on a mountain about 100km to any town....

Attached Thumbnails
motor/trany swap HELP!!!-imgp4437-1-.jpg   motor/trany swap HELP!!!-imgp4553.jpg   motor/trany swap HELP!!!-imgp4555.jpg  
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Old 06-06-2008, 07:59 PM
Registered User
Join Date: May 2005
Location: Northern VA
Posts: 225
I think bgkast was requesting close-up pictures of the engine and how things are hooked up.

It would really help by posting good engine pics
83 300D 328k mi (623) Light Ivory - daily driver
82 300D 166k mi (881) Thisle Green - fixer upper
82 300D 282k mi (473) Champagne - parts
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Old 06-06-2008, 09:13 PM
lutzTD's Avatar
Registered User
Join Date: Oct 2006
Location: Lutz, Florida (N of Tampa)
Posts: 2,458
vacuum diag will take you part of the way, maybe get the trans shifting closer to correct. the ALDA still sounds like your issue. there should be a banjo bolt line running from the rear of the intake manifold to an electric valve. then from the valve to the a banjo bolt on the side of silver ALDA valve on the back of the injection pump. the valve elctrical connection comes from a pressure sense switch on the intake. when all is correct the boost pressure will go through the valve allowing the ALDA to give more fuel. if you over boost the electric pressure switch will block the boost signal to the ALDA reducing the added fuel and lowering the power boost down to a safe level. you can run without the valve, but it will not save you from an overboost condition. also remove the banjo fitting bolts and clean the hollow bolt on the manifold as this tends to fill with carbon. do not over tighten since it is a hollow bolt

1982 300CD Turbo (Otis, "ups & downs") parts for sale
2003 TJ with Hemi (to go anywhere, quickly) sold
2001 Excursion Powerstroke (to go dependably)
1970 Mustang 428SCJ (to go fast)
1962 Corvette LS1 (to go in style)
2001 Schwinn Grape Krate 10spd (if all else fails)
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Old 06-06-2008, 09:23 PM
Registered User
Join Date: Mar 2005
Location: Vista, CA
Posts: 345
Check to see if the bowden cable is working. It runs from the transmission to the linkage on top of the valve cover. If it is amiss, it will slow you down a whole heck of alot.

1979 240D with a 617 turbo diesel.
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Old 06-06-2008, 10:22 PM
pawoSD's Avatar
Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 15,243
I also bet your Boost line is not hooked up to the alda. Its a clear plastic tube that runs from a banjo bolt on the back of the intake manifold across to a switchover (overboost protection) valve, and then into the alda, which is that square thing on top of the Injection has a little cap on top of it. With no boost fuel enrichment you're looking at about 85-90hp max.....probably less than that even. With it working you'll get about 30-40 more. Big difference....
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 88k - mine - (OC-91,200)
'17 Metris(VITO!) - 16k - wifes (OC-17k)
'01 E320 Wagon - 159k - mine (OC-160,000)
'01 E320 - 179k - dad's (OC-182,500)
'07 E350 Wagon - 133k - dad's (OC-132,500)
'01 SL500 - 52k - dad's (OC-52,000)
'16 E400 4matic Sedan - 70k - Brothers (OC-72,000)
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Old 06-24-2008, 11:30 AM
Join Date: Feb 2008
Posts: 42

Thanks for the help...

Forgot turbos make pressure and blew of the vacuum line to the injector pump.

Got all the lines clamped and rechecked all the lines to tranny, EGR ect...

Lots of power and proper shifting>

Thanks for all the help everyone...cannot thank this forum enough
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Old 06-24-2008, 11:48 AM
Registered User
Join Date: Jul 2006
Posts: 109
That thing is classy. I love those old FC's, and the MBZ diesel gives it even an even more unique style. Nice work.
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Old 06-24-2008, 02:23 PM
Registered User
Join Date: Jan 2002
Posts: 18,355
I'd like to see pictures with the camper on it. Did you put that trailer in one of the pictures onto the truck frame?

1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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