Power Trac Replacement Engines Suggestions!?!?

Charlie_Iliff · Mar 18, 2003

Re: Engines

 the pumps bolt together in line on the 1845 
Ed's right, of course. The two pumps are in tandem in front of the engine, apparently with concentric shafts driving directly from the engine crankshaft. He's also right, I think that it would be tough to stuff the 45 hp Deutz in the 425, but maybe the two-cylinder from the 1430 would be possible.
I haven't measured either, but I have a B7100 Kubota and a Jacobsen Turf Cat with a Kubota 21 HP diesel if there is serious need for dimensions. Both the Kubota engines are pretty old. I would think newer, lighter, higher revving diesels might be of more interest.

marrt · Mar 18, 2003

Re: Engines

( Thinking of putting the 45 Deutz in a 425?)

Actually, I wasn’t thinking of putting a 45 HP Deutz in a 425. It would be dang cool though. Since there isn’t room in the existing cavity, maybe I could “built up” like they do in cities with skyscrapers. /forums/images/graemlins/wink.gif

I asked the question originally because the Kohler is somewhat unique in that one can attach a pump to both ends of the engine. Most aftermarket diesels only have one PTO point out the “back.” So, I was curious how PT addressed the problem. To be clear, when you guys say the pumps are in tandem, does that mean the sit side-by-side or one-after-the-other? Also, would you mind giving a little more definition to “concentric shafts”? I’m having a little trouble visualizing how that works.

At one point, I researched the dimensions of the Daihatsu (Briggs) diesel and concluded that it would probably fit down in the compartment. However, I was concerned about how to connect the pumps since there’s only one PTO point.

Also, there is the issue of radiator placement (assuming one goes with an engine that requires a radiator). One option is to attach the radiator on the back of the PT and put an electric fan on the inside. This would require the creation of a fairly substantial guard to protect the radiator (in case one backs into something) but it should by doable.

Schultz · Mar 19, 2003

Re: Engines

Attached is an example of the Parker parker tandem pump.

Below is the link to the parker catalog that will explain more about piggybacked or tandem pumps, through shafts, and other types. With some brands you can stack up to 6 or 7 pumps.

Look to ahead to page 25
Paker gear pumps

Hope this helps

Schultz · Mar 19, 2003

Re: Engines

Maybe this one will have the attachment

Charlie_Iliff · Mar 19, 2003

Re: Engines

 To be clear, when you guys say the pumps are in tandem, does that mean the sit side-by-side or one-after-the-other? Also, would you mind giving a little more definition to “concentric shafts”? I’m having a little trouble visualizing how that works.

Marrt: The larger pump is bolted to the engine bell housing, and the smaller pump to the front of the larger one. The housings are not modified - they are designed to bolt together. They are aligned in front of the engine as if the crankshaft of the engine were extended forward through the middle of both pumps. As Schultz has noted, Parker sells the pumps set up to do this type of end-to-end junction.
Because of the end-to-end placement, they take a lot of fore and aft space. It is 18 3/4" from the bell housing plate to the front of the lift pump. Clearly, with some kind of jackshaft, pulley or gear system you could reduce that length, but at the cost of some complexity and small power loss. On the 1845, the pumps extend under the fuel tank, where there is a lot of space anyway.

bullitt · Mar 25, 2003

Re: Engines

The 27 hp Kohler is installed in my 422.

The 427? climbs better that the 422, approaching the limit of the engine oiling system. I can now get up hills (20 - 25 degrees) that were out of the question with the 422. It is unclear why.

The 27 hp kohler starts better than the Robin, though the "fixed" Robin did have OK starting. I look forward to testing it properly next winter.

The Kohler also seems quiter than the Robin. It is also my inpression that it uses less gas. Again, I don't know why, it just does.

If anyone needs a Robin engine (27 hrs), cradle, and couplings near the Pittsburgh area, let me know.

bullitt

PTRich · Mar 25, 2003

Re: Engines

You have become my personal PT hero! The only down fall to the success of the "transplant" is you will probably be asked many questions for the remander of your TBN membership!

MossRoad · Mar 25, 2003

Re: Engines

 The 427? 

You need some custom decals now /forums/images/graemlins/cool.gif

What were the major obstacles to the conversion?

Charlie_Iliff · Mar 25, 2003

Re: Engines

 The 427?
You need some custom decals now


Lots of 427 decals around if you like crossed checkered flags or V8 signs. Maybe even a bowtie.