I am going to look at a 240D with high hours. I have been reading up on other posts for info and have a few questions.
Is there anything particular to look for in this model? Does this model have a water pump? does it have a hundred or thousand hour meter - and is it true the hour meter spins fully at full rpm's and slower at lower rpm's? . How do you check for blow by?
What would a high hour (4000) 240D with FEL and BH be worth?
To answer your questions with my opinion. Trouble spots, umm, make sure the 3 pt works. Thats about it and make sure all gears in all ranges work and wont jump out. The hour meter is 3 places with a tenths place (really 4 #'s shown) So once the tractor reaches 999.9 hours it will flip back to 000.0. You are correct the tractor will turn 1 hour on the meter at 2400rpms for 1 hour of run time. So at 1200rpm it will take about 2 hours of wristwach time to get 1 hour to show up on the hour meter. I usually will bushog for say 4 hours and end up with 2-3 hours on the meter depending upon how fast the engine is going and how much i slow down etc.
A 4000 hour meter tractor to me would only be worth about 1-1.5K w/out loader, that would be without a rebuild, with a decent rebuild you can be creeping back into the 2-3k range. Thats my opinion though. Most say these that actually have 4000hours on them are ready for something to need to be done, weather its new rings and bearings or something more like pistons cyl hone rings and bearings etc. And to know it has 4K on it it would have to be the original owner or second that was told by the first as there is no way to tell.
As far as blowby, there should be a rubber hose about 1/4 coming off the side of the block on the right side as your sitting in the seat. It will run down and just end in mid air around the hard hydro lines. If there is a lot of oil slobber blown on the side of the block this would be a good sign of blowby. The rubber hose may also not exist, in that case there is a fitting still on that side that it just pushes onto, if i remember right its a metal j tube pointing down that the hose should be on. Its a little above the injector pump and foward a little. I would run it up to 2400rpm, the fully ratted HP rating and drive around while looking at that tube and see if you see smoke or mist coming out of it, you can also let it run at 2400rpm and stand beside it and feel for air mist coming out, mine has just a little pressure , which i think is just from the rotation of the crank inside, but no spray mist or anything, a drip now and then but not constant. You also should put the tractor under a load and observe this weather it is a boxblade you put down to "work" the tractor or a disk in the ground or a bushhog that you set really low to tax the motor, it will let you know and if you dont see blowby at that point chances are it dosent have it.