[Cvans]

My Son in-law just purchased a G4200 that had been setting for 5 years. Needles to say it shakes pretty good when idling but started right up. I'm hoping by now that he has installed new fuel also. Nice to hear that yours is up and running.

 

[boostedbuick]

Fired it up again today and finally figured out how to get it to engage and move under its own power. I don't know how much power its supposed to have but its certainly not running right with all the shaking. Couldnt test compression because I didnt have the right fitting but I'll ask around tomorrow.

I couldn't get it to die while driving it unless I sidestepped the clutch in 3rd while at a dead idle. otherwise it'd chirp the rear tire and take off. But it seems to labor a lot to gain rpm while in gear. Wish I had a normal running one here to compare it to. Never been around a small diesel, I don't have a clue what it's supposed to do. Sounds like it has a miss.

Gearbox pushes oil out everywhere when its moving. Continuously dripping even after 5 mins. Don't really care, no need for the box, but I thought it was odd. Comes out the shifter boot and if you pull the stick it flows out. Good clean oil smells like 90wt.

Rides like crap with no seat. Bout went off the back of it when I popped 3rd at full rpm.

Would have been fun to get up and chase an unmanned half tractor running amok.

 

[boostedbuick]

HA! Just noticed I'm a "contributor" now. Musta been the engine manual I uploaded. Best $12 I ever spent BTW.

 

[Cvans]

Here's a good video that should give you a good idea of how your mower should sound and operate. This sounds just like mine.

 

[olcowhand]

At slower speeds, these twins do sound as though they have a miss, and they have shake at slow speeds even running perfectly. 3 cylinders are almost perfectly balanced, but not twins.

 

[boostedbuick]

Factory compression spec (converted from metric) is 448 psi with a 337 psi rebuild threshhold. The story of it being rebuilt must be true. first cylinder just touched 500 psi and the front cylinder hit 450 but it took longer. This was warm but not full operating hot by any means. the lower of the 2 cylinders had a lot of soot/carbon on the glow plug and I know the glow plug is working. I think thats the one thats not pulling its weight and I dont think that side of the motor was warm enough. It took me FOREVER to get the ambition to get the right adapter for the compression gauge and the d**n schrader valve was bad right out of the box. Had to procure another so I had to assemble and warm up and then do the test TWICE. Starting this thing in late fall is a chore.

Next is injector testing. Luckily my place of employment has a tester to test the popoff pressure of the injectors. Kubota manual has the spec as well as instructions to re-shim. I got a million things to do to my grand national as well as move from one garage to another and I plan to spend the winter working on the interior of my house. So updates will be few and far between but when I do something to it I WILL be back. I know everyone's on the edge of their seat waiting for the outcome LOL. NOT!

 

[boostedbuick]

Injector popoff pressure spec is 2000-2150 psi. Got them to work this week and had the diesel guys play with them on the test fixture. Injector on the "suspected good" cylinder pops off at ~1500 psi but has good pattern and consistent popping operation. Injector on the "suspected lazy" cylinder gets to ~1800 but spray pattern is erratic and if you really lay the pressure to it, it sticks open and just sprays. We think it's washing the cylinder rings and is the cause of that cylinder beihng lower/slower on the compression gauge. Injector pump is in time as near as I can visualize using the timing marks on the flywheel, both sides shoot equally high toward the ceiling when cranking LOL. I found the part number for the shim kit assortment to re-shim the injectors to proper spec after a disassemble/cleaning. Basically rebuild them in house. $32 shipped for the shim assortment. Something every kubota owner should probably have checked/done. If this don't fix it, It's for sale!

BTW the rubber return hoses were so brittle, there's no way in hell anyone's even had them out of the tractor anytime recently, let alone an engine rebuild.

 

[boostedbuick]

I cleaned and re-shimmed the injectors and plan to drain the old fuel before running. Guys at work told me to flush everything and replace both filters, they are worried about algae forming in stagnant diesel. I will probably replace the rear one and kerosone wash the front one.

I took some pics while redoing the injectors. If anyone wants to read about what I did/found when re-shimming I could do a write up with pics. You'd need to locate a tester to borrow/rent/use somehow. Once you got them clean (at home) you could swap shims out really fast at someone elses shop if they have a tester available.

 

[Cvans]

I think I'll leave that part of servicing a diesel I'll leave to the experts. Good to hear your making headway on the tractor. You'll have to let us know how it turns out.

 

[boostedbuick]

Aww come on it's not rocket science. Shim kit is 30 bucks and if the tips are worn/rusted/damaged I found the kubota part number for an entire new tip with pintle for like 18 bucks each online (without price shopping). Just remember to use a toothpick to clean the tip so you don't mess up the precision machining .

 

[Cvans]

I have disassembled the injectors and cleaned them. I don't have the equipment available set them up. Your right, it's not rocket science but it does take some special equipment that is not available on every home place in SD. That said I'm still glad it is working out for you.

 

[motorman]

I'm going to go pick up my new to me G4200 with the Z430 diesel this week. Owner say it runs but not really well. Said something just doesn't seem right. Been through a couple hands this way so I'm wondering if there's an online service manual for this engine. I downloaded the parts manual, and I've seen the tractor owners manual posted also but didn't figure it had the engine details. Things like injector pump timing and basic info related to testing injectors and the injection pump, etc. Hoping it's an easy fix. But don't know where to start on it when I get it here tomorrow. Don't know how long it's been sitting so I'm gonna make sure it has fresh clean diesel and fresh oil before trying anything. I'm actually buying just the engine, if the owner doesn't want the tractor, it'll be available here, either all or parts, for whoever needs anything. I hate scrapping stuff that someone else needs.

I am looking for a G3200 Kubota MOWER DECK Handle assembly, if it will work.