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Greetings everyone from West Tennessee

I recently picked up a 2000 year model 5205 with 521 loader and 7 foot disc harrow at an estate sale. It will be used to expand and maintain food plots on family property for deer and turkey hunting. I was using an older Case-IH 23 HP tractor that would only pull a 4 foot bush hog and not enough power to break ground and it wasn't getting it done for me.

This 5205 has 1600 miles, was barn kept and used mainly for finish mowing. It starts and runs great and everything works. Both rear tires are filled with fluid. The owner/operator was at the sale and came up to me after I won the auction and told me how they used the tractor, the recent maintenance performed and even drove home and returned with the operators manual which he gave me. He gave me his cell number to call if I had any questions. What a nice thing to do. I feel that I got a capable machine that has been well maintained and lightly used. He said they never used the disc with this tractor, just the finish mower and he bailed a couple hundred square bales of hay.

I have washed it up, changed the oil, greased every fitting I could find, all new filters and I will flush and replace the coolant and install a new thermostat when the weather gets better. The hydrolic fluid was changed out last year. Can't wait to put it to work.

Looking forward to learning more from you guys and participation in the discussions.

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Nice rig! :greentractorride: :bigthumb:


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We're practically neighbors. :drinks:
 

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Hiya,

Welcome.

When you change the coolant, I believe the engine in those is a wet sleeve design. You'll need to get a DCA/SCA additive to put in with the coolant as wet sleeve engines are susceptible to cavitation and sleeve erosion if the coolant doesn't have the correct additive package. I did a post on how cavitation happens and how DCA/SCA additives help control it, I'll see if I can find it and update this post.

Found it:
DCA/SCA are not corrosion protection additives per say although they do provide some benefit, it is not their intended use. They are introduced in specific applications to prevent erosion of components due to "cavitation" or the damage caused by the harmonic vibrations of cylinder walls causing the coolant to impact upon them with pressures over 60,000 PSI.

So here is how it happens, as the engine is operating, the cylinder liner is expanding and contracting with a harmonic cycle, During the combustion event, the liner expands in diameter from the pressure and heat inside, as soon as the pressure subsides with the exhaust valve opening, the liner contracts to a slightly smaller outside diameter than it's nominal diameter due to the inertia of the material, the coolant cannot remain in contact with the outside surface of the liner as it is moving very rapidly and a small low pressure area is formed between the 2 which produces very small air bubbles in this low pressure zone, eventually the rest of the coolant catches up to the liner just at the point the cylinder liner begins to rebound to it's natural diameter, (this restitution event of the liner is very fast) the liner and coolant collide with great force and pressure noted above and it is this pressure wave impact that strips the material from the liner in very small pits that eventually grow to holes.

What DCA/SCA's do is coat the liner with a nitrite solution, this causes the outside of the liner to oxidize with the nitrite providing a harder surface for the coolant to impact against. DCA/SCA's DO NOT stop cavitation, they simply coat the exterior surface of the liners and provide a surface for the impact to take place on. Since the cavitation still takes place, eventually the nitrite lining is worn away, this is replaced by fresh nitrite from the DCA/SCA package. This is why you need to monitor the levels 3x a year and replace what is consumed.

Now, what would happen if you put DCA/SCA packages into an engine that doesn't cavitate? Yep, the nitrite lining would build up throughout the engine and cooling system, coating every last bit of it. Since no cavitation is taking place, the nitrite isn't stripped away and continues to layer on, eventually getting to the point where is impedes the transfer of heat and/or begins to plug coolant flow. Both of these can lead to engine damage.

So basically, if your manual calls for DCA/SCA, use them properly and check them 3x a year, if the manual says you don't need them, keep them away from your equipment, they can cause more harm than good.
 

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Discussion Starter #9
TomD99

Thank you for that thorough description. The tractor does have wet sleeves. I tend to run a little OCD so I read the manual start to finish within 2 weeks of getting the tractor. I went to the JD dealership and purchased the product in the picture below. Let me know if this isn't the correct additive.

Thanks again

View attachment 524202
 

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TomD99

Thank you for that thorough description. The tractor does have wet sleeves. I tend to run a little OCD so I read the manual start to finish within 2 weeks of getting the tractor. I went to the JD dealership and purchased the product in the picture below. Let me know if this isn't the correct additive.

Thanks again

View attachment 524202
Tried link and it did not work.
 

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Welcome to the forums, nice ride.
 
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