So I did a thing... Agria 8900D

[CalG]

I've done that die grinder on the tool post trick several times with various rigid adapters and my experience has been that you don't get results like a real tool post grinder because you are limited by the die grinder bearings which tend to be on the loosey-goosey side in the runout department (probably deliberate to deal with grinding dust). I've found it works in some applications that you only need +/- 0.001-0.002" for it to work, but as etpm mentioned above you'll need a very exact fit here and unless you have an exceptional high precision bearing die grinder I'm thinking you're not going to have much luck. Of course YMMV

There is always lapping to improve size and finish.

 

[ptsg]

Took a break from all the cleaning, scrubbing, washing, etc and tackled the king pins for the articulated steering. Both had a lot of wear but the top one had some deep scores from the grenaded bearing.

Started by turning down the diameter from what should be 25 mm but wasn't even close to that, down to about 22 mm. Then filled it back up with weld. Finally, turned it back to the proper diameter.

 

[etpm]

Took a break from all the cleaning, scrubbing, washing, etc and tackled the king pins for the articulated steering. Both had a lot of wear but the top one had some deep scores from the grenaded bearing.

Started by turning down the diameter from what should be 25 mm but wasn't even close to that, down to about 22 mm. Then filled it back up with weld. Finally, turned it back to the proper diameter.

View attachment 845615 View attachment 845616 View attachment 845617

Looks great. Many years ago a farmer brought in a shaft that was heavily worn because he never greased the thing. I had to add about 8mm of weld to begin machining it back to size. I goofed though and used the wrong rod. I used hard facing rod. Crap. So I ended up using an angle grinder to grind out all the weld and then I built it back up with the proper rod. I lost money on that job. I did tell the farmer to learn how to use a grease gun as this wasn't the first, or even third, shaft repair job I had done for him. I'm sure you won't grab the wrong rod when repairing this tractor.
Eric

 

[ptsg]

Looks great. Many years ago a farmer brought in a shaft that was heavily worn because he never greased the thing. I had to add about 8mm of weld to begin machining it back to size. I goofed though and used the wrong rod. I used hard facing rod. Crap. So I ended up using an angle grinder to grind out all the weld and then I built it back up with the proper rod. I lost money on that job. I did tell the farmer to learn how to use a grease gun as this wasn't the first, or even third, shaft repair job I had done for him. I'm sure you won't grab the wrong rod when repairing this tractor.
Eric

Ouch! That was an hard mistake to do. Pun intended.

Matter of fact, I did use the wrong rods but it's not as bad of an error as in your case. I have a box of 309L rods which are better suited for this purpose. Ended up grabbing the 308L ones, which are technically intended to weld stainless.

I have some build up work to do on some of the castings for the center pivot. That will be an interesting one too.

 

[ptsg]

Got the head back. It's like it never happened.

New valves, new guides, valve seal, all done to spec.

I wanted to show you the fix for the hole on the head but it's super hard to show. It's essentially a set screw with some sort of glue. Looks good to me. Till will tell how long it lasts but at least got the head fixed.

You can see the threads on the left picture and the other side of the set screw on the right picture.

 

[fidowanttobe]

Wow.
Some talented people there!
Can't wait for more updates.

 

[MTGreen]

Looks great! I hope the repair cost you less than the head replacement

 

[ptsg]

Wow.
Some talented people there!
Can't wait for more updates.

Absolutely! This shop earn my business in any future endeavors for sure. Down to earth guy and straight to the point.

Looks great! I hope the repair cost you less than the head replacement

€90 or about $98. Not too bad at all.

I still get to keep the Lombardini head instead of going with an unknown manufacturer one. Not the end of the world but still nice to know that's a quality head.

 

[ptsg]

Got enough of the engine put back together. Enough to start it anyways. I won't bother with all the air duct sheet metal yet as that will be painted a different color.

Turns out the rear crankshaft seal that came in the gasket kit is for the industrial version of this engine, which has a longer crankshaft and therefore a different diameter. At least, the flange is easy enough to pull out and put the seal back in once I get sometime next week. Can still start it without it though.

These engines are super simple and easy to work on. Only took me a couple of hours in the afternoon to assemble it till this point.

I'll come up with an oil pressure gauge before I start in. I want to monitor that for the initial run.

 

[ptsg]

Well, it ran!!! It ran super nice actually. Cranked a little bit to bleed the injector and it start right after, surprisingly, with very little smoke.

I had full intentions of recording a video of it running, but turns it's quite an handful even though it was strapped to the bench and got the chain hoist lifting slightly. It just wanted to jump all over the place.

It's quite a relief seeing it running. I wasn't sure if the injection system was any good, given the state of the rest of the engine.