John Deere 755 Turbo

[Nick359]

I started my turbo install on the JD yesterday. I am in the process of making a header for it, because the turbo was too big to fit where the muffler was. The turbo will sit above the engine and drain the oil back to the valve cover.

I am using a TD02 twin scroll. I will be running the numbers one and three cylinders to each scroll and then "Y" the second to both of the others. Hopefully that will work.

I had a hard time finding metric pipe to make a "T" at the oil pressure sender. I was thinking about tapping the block to NPT. I am concerned about getting metal shavings in the block. Does anyone have any suggestions?

 

[moship]

I like your project! What prompted this project and how did you size the turbo and fuel requirements?

Metal chips: If not going all the way through chips are not too much of a problem given the flute design. Grease on the tap can help hold chips, but must be removed frequently, cleaned and grease added during the process. If another set of hands are available consider using a shop vac, but you might have to make something to neck the end down if space is limited. For a make shift nozzle, I've used manila folders and duct tape.

If you don't have to drill all the way through chips are not too much of a problem with the above suggestions. If the drill breaks all the way through the metal there is always the risk of a chip breaking off and going inside.

Good luck with the project and I'm anxious to see how this turns out.

Tubing: Could you buy a stock piece and cut the needed section from it? Perhaps a longer lenght is used on another model. Google search found a few suppliers, but I was surprised at the cost.

 

[Nick359]

The header did not work out. My pipe bender was crimping the pipe. I needed too much of a bend, at least 180. I tried to use two 90s, but it looked bad. I ended up using some pipe I had laying around to hook the turbo to the stock manifold.

I also had to turn the housing. I had to redrill a pin on the exhaust side and remove a pin on the compressor side.

I like your project! What prompted this project and how did you size the turbo and fuel requirements?

The turbo is used on a 670cc or so gasoline engine. It is good for 700 to 1500cc diesels. The 755 is just under 900ccs. To get more fuel I will turn up the pump.

I wanted to put a turbo on it, because I have a hard time climbing the hill in my back yard with the backhoe attached or with a bucket of dirt. I also run out of hp before traction when doing loader work and pushing snow.

 

[mjncad]

Check McMaster-Carr www.mcmaster.com and see if they have a metric to NPT fitting, or check a Parker Store or other well stocked hydraulics supply house.

 

[Nick359]

I solved the metric pipe to standard pipe problem. When I got the oil line made today I got an adapter. It is metric to 1/8 NPT. I won't be tapping the block and possibly put metal into the oil passage.

 

[nspec]

Pretty cool. I especially like the artistic quality of that one picture - you know, the beer can and the turbo together...

Are you sure you want the drain line to go to the valve cover? Shouldn't you be running that to the pan?

 

[Wyobuckaroo]

Use a "spiral flluted" tap.
It will pull all the chips up the flutes and out of the hole.
Not push them into the hole.
Will be more $ but should do what you want.

Good luck
Wyo

 

[Nick359]

I was hoping to put the oil return in the valve cover, but there is no drain to the front or rear. All the oil goes down the pushrod holes. I will be taking the pan off and putting the return in the pan. I had to fix a leaky valve cover gasket, and I will adjust the valves before I put it back on.

 

[moship]

Nick359,

Reference your earlier comment about kinking the header tubing.

What size tubing are you using to make the headers? Some automotive header companies sell u-bends and even donuts to fabricate your own headers. I've used them in the past to fabricate headers and they work well. The only issue I see is the tubing diameter may be too large for your tractor.

I was also wondering if a turbo charges has been added to this family of engines, but for a different application. After reading you post, I started researching turbos on Kubota engines and found a number of them come with turbos. However they are typically not for tractors applications. Perhaps some other application is out there and parts can be used directly or modified for you project... Just a thought.

 

[Nick359]

I made a set of headers for my 383 Chevy powered Toyota. I was using the left overs to hook up the turbo on the tractor.

I was going to use schedule 40 3/4" pipe for the headers. I could only find the prebent tubing in 1 1/2" and larger. I made bumpers and the cage of the Toyota with schedule 40, you can see the truck in the background of some of the pictures. I have a cheap pipe bender and it was crimping the tubes. The bends needed to be 180 degrees or so.

I don't like where the turbo is now, so I will be changing the location. As I got deeper into the project more things changed. Not everything was fitting together the bast way it could. It all started from not making the header. I guess I had it in my mind the turbo had to be there. It doesn't matter how much time you have in something. If you don't like it, redo it.