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  #1  
Old 08-29-2012, 10:55 PM
GemstoneGlass
 
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85 OM617 federal Engine into 300d 4speed conversion

I have a line on a good running engine. My friend selling it tells me its an 85 300d engine. I did not find a trap oxidizer so i assume it is a 85 OM617 federal engine. It should just bolt up. Correct? Are there any things that may cause issues setting it up?

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  #2  
Old 08-30-2012, 03:53 AM
t walgamuth's Avatar
dieselarchitect
 
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What year is the 300D?

If its a 123 the answer is yes.
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..I also have a 427 Cobra replica with an aluminum chassis.
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  #3  
Old 08-30-2012, 03:56 AM
t walgamuth's Avatar
dieselarchitect
 
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What year is the 300D?

If its a 123 the answer is yes.

If you do the swap you need to be mindful of the flywheel though as it may be balanced with the crank on either engine. There are numerous threads here about match balancing the flywheel. It is not hard but is an important step.

I have done five or six engine and or tranny swaps and once I had a flywheel that was match balanced to the crank.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #4  
Old 08-30-2012, 04:50 AM
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The 1985 engine uses a bit more electrical components and sensors for the EGR, but if you don't use the EGR, that is not a problem.

Also the 1985 engine uses a vacuum transducer for the transmission. It depends on the transmission whether you need that.
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  #5  
Old 08-30-2012, 08:35 AM
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The 1985 picks its tach signal from the flywheel and transmits it via the egr computer in the front passenger kick panel. Believe the older engines pickup the signal from the crank. Might have to rig something up but should be able to get a tach going.
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  #6  
Old 08-30-2012, 09:21 AM
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85 300D 4spd+tow+h4
 
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Quote:
Originally Posted by Merica View Post
The 1985 picks its tach signal from the flywheel and transmits it via the egr computer in the front passenger kick panel. Believe the older engines pickup the signal from the crank. Might have to rig something up but should be able to get a tach going.
The 85 uses a signal at the front for diag, rear for tach. No need to worry about putting an 85 into an 83 etc. Beware the crank pilot is smaller than normal bearing. Will need to make the bearing smaller. I
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  #7  
Old 08-30-2012, 09:50 AM
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Quote:
Originally Posted by winmutt View Post
The 85 uses a signal at the front for diag, rear for tach. No need to worry about putting an 85 into an 83 etc. Beware the crank pilot is smaller than normal bearing. Will need to make the bearing smaller. I
Do you know what engines / years have the smaller pilot holes?
I have only seen them in 617 turbos.
Looks to me that the seat for the pilot bearing wasn't finished in the machining process, may be because all turbos are automatics?
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76 240 D. Bought in 1998 for $25.
85 300D. Got it for free with a bad engine. ( Sold )
60 Unimog 404. What was left of it, was given to me. Now powerd by 617A.
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  #8  
Old 08-30-2012, 10:07 AM
t walgamuth's Avatar
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I think 85 is the only 617 with the smaller pilot hole.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #9  
Old 08-30-2012, 10:18 AM
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I just had the engine out of my 85 300D, but I didn't check on that.
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76 240 D. Bought in 1998 for $25.
85 300D. Got it for free with a bad engine. ( Sold )
60 Unimog 404. What was left of it, was given to me. Now powerd by 617A.
88 560 SEL. Bought without engine and trans. Now powerd by 617A.
67 250 SE. Cuope. For resto or sale.
64 220SE. For resto.
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  #10  
Old 08-30-2012, 10:30 AM
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The small crank hole is well documented, and the problem with the pilot bearing when doing a 4-spd swap.

When I did my 85 4-spd swap, I lucked out that the new rebuilt engine had an earlier crank. I`ll also throw in here, that the tach pick is on the adaptor plate at the rear of the engine, and will still work with the manual FW.


I did a search on TOMJ, he had this pilot bearing problem several years ago.

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Anyone that thinks a 240D is slow drives too fast.

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  #11  
Old 08-30-2012, 11:35 AM
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Quote:
Originally Posted by t walgamuth View Post
I think 85 is the only 617 with the smaller pilot hole.
I installed the regular pilot bearing in my 85 and it is about 28 thousandths to large. However, by putting it in a freezer overnight I was able to drive it in (on a hot day) using a long close fitting socket and marking it so that you don't do unnecessary beating on the side of that bearing. You want to know when it is in all the way. If installing it this way on a cold day, I think heating the bore with a propane torch would be helpful.
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1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA

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  #12  
Old 08-30-2012, 11:44 AM
GemstoneGlass
 
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the bearing thing complicates it a bit

Its never simple is it. Its not a good reason to pass on the motor is it. Yes its for the 80 300d.
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  #13  
Old 08-30-2012, 11:47 AM
t walgamuth's Avatar
dieselarchitect
 
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Quote:
Originally Posted by junqueyardjim View Post
I installed the regular pilot bearing in my 85 and it is about 28 thousandths to large. However, by putting it in a freezer overnight I was able to drive it in (on a hot day) using a long close fitting socket and marking it so that you don't do unnecessary beating on the side of that bearing. You want to know when it is in all the way. If installing it this way on a cold day, I think heating the bore with a propane torch would be helpful.
I have wondered what happens if you ever want to remove this one?
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #14  
Old 08-30-2012, 12:37 PM
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I had that problem with my Unimog.
When I tried to put the pilot bearing in, it didn't fit.
So I got a bearing with a smaller outside diameter and made a bushing for it.
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76 240 D. Bought in 1998 for $25.
85 300D. Got it for free with a bad engine. ( Sold )
60 Unimog 404. What was left of it, was given to me. Now powerd by 617A.
88 560 SEL. Bought without engine and trans. Now powerd by 617A.
67 250 SE. Cuope. For resto or sale.
64 220SE. For resto.
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  #15  
Old 08-30-2012, 01:21 PM
GemstoneGlass
 
Join Date: Dec 2005
Location: Northern,Ca
Posts: 882
getting one made

It sounds like a hassle but i will check about having one made. I guess i could buy a bearing and have the bearing shop make one identical but a little smaller OD.
Well i have to think about it for a while again. I still want to do a compression or leakdown test on this engine if I do use it. although i trust it ran like a champ. I am friends with the seller and the car it is from was rear ended.

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