D600 Questions

zilla24 · #1 09-12-2023, 12:24 PM

This may or may not be the right place for this question but...

Background: I'm working on an engine swap in my 1572. While moving components over from the tired Cub D600 to the replacement D600 I noticed some differences in the gear case assembly, (for reference the replacement D600 came from a G5200 Kubota Garden tractor). The Cub engine has a cover and threaded studs in the gear case, the G5200 does not. These studs are important as this is where the Cub throttle and engine kill cables and their respective bracket are mounted.

I think I have a few paths forward at this point, summarized below:

1. Swap gear case cover from the 1572 to G5200 engine. This is the path to maintain a "correct" OEM engine. I'm reluctant to do this because the G5200 engine runs great and is leak free.
2. Fabricate new mounting plate and bond it with a high strength adhesive to the G5200 cover. Simple fabrication with studs welded in place that is the same thickness as the OEM cover plate. This will allow mounting of the OEM throttle linkage bracket and is relatively low risk. Worse that can happen is the adhesive doesn't hold. Understand in this scenario I will need to find a new ground location as the lower stud will now be insulated from the engine block.
3. (High risk), transfer punch holes in the G5200 cover, drill and tap holes for mounting the OEM throttle linkage bracket. I "think" there is sufficient material there to do this.
4. Fabricate unique throttle linkage bracket after G5200 engine is installed in the 1572, use existing holes in the G5200 engine cover. This will take some time to get sorted out correctly.

Has anyone encountered a similar issue? Thoughts on path forward?

zilla24 · #2 09-12-2023, 12:29 PM

The 1572 cover is pictured first, G5200 second.

Oak · #3 09-13-2023, 05:27 AM

That's a tough one for sure. Being that that's aluminum and if you still have the motor out, I'd probably drill and tap it.

What happened to the original D600? I have one with 3000+ hours and it still runs fine.

zilla24 · #4 09-13-2023, 07:56 AM

From what I could tell it was low on compression and would not start, but I am definitely not a diesel mechanic. A relative deal came up on a running G5200 (actually two but that's another story) and I jumped on it. I will eventually try and rebuild it or part it out.

Appreciate the feedback, at this point I am leaning towards option 2 as the most favorable. It should be easy to trace out a plate based off the old inspection plate and then tack in some studs. I'm a little leary of the drill walking into an unknown area. The jury is out on how well it will hold though.

I'm a little surprised that there is actually a difference between the two applications Cub vs. Kubota.

ol'George · #5 09-13-2023, 07:59 AM

First off, I've not ever laid eyes on one of them smokers.
That said
Forget the Bad idea of "glue"
Make up a flat plate using the existing bolts in the area or replacing the bolts with studs to allow mounting a plate that you can now mount your linkages.
If you use 1/4" aluminum you can drill/tap it for the bracket. or use metal if you have to do any welding for something.
If me, I'd pick the easiest.
in the long run the cover swap might prove the best option.
Understand, I don't know your shop equipment availability or your lever of craftsmanship.
As I age I have learned to consider time spent reinventing the wheel so to speak.
Do the cover swap and never think of it again.
Just my opinion and you did ask Ha,LOL.

jbrewer · #6 09-22-2023, 08:41 AM

One other option may be to use another set of bolts in the general area and fab a plate using those holes to mount it to hold your linkages.

zilla24 · #7 10-30-2023, 08:13 AM

Been slowly working on this project and finally came to the crossroads where I had to make a call on the throttle linkage bracket…

Decided to go for it and drill and tap holes in the existing timing cover. I found some pictures of the inside of the cover and it gave me enough confidence to give it a try. Worst case scenario I would have had to pull the timing cover, clean everything and then drill thru for studs. Luckily I didn’t have to do that, I was able to drill .25” deep and tap M6x.1 holes. I clamped ground bar stock to the throttle levers and then transfer punched the cover to ensure the bracket would line up correctly and everything was on the same plane. Pretty happy with the outcome, now on to the next problem...