Installing Engine Oil Cooler on JD Z710A
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    Installing Engine Oil Cooler on JD Z710A

    My Z710A with the 23 HP Kohler didn't come with a oil cooler. Some of those Z700, Z800, and Z900 series Ztraks came with oil coolers.
    So, this is a winter project for now, as I have decided to install a John Deere/Kohler oil cooler on my engine. Here is a picture of the oil cooler less the sandwich adapter. I have bought a different adapter for the cooler. I will not be connecting it to the top engine housing as the factory ones. Instead, I will form a bracket to install it some three inches on the right side of the engine bay with a 4' x 4" 12 volt fan to push the air into the cooler fins.
    Now, the big 64 thousand dollar question. How much engine oil should I add to the crankcase? It appears to me the oil cooler probably will hold about 1/2 pint or less. With this extra oil in the crankcase and it will show more on the dipstick. The user manual doesn't state anything about this on engines that have the factory oil cooler installed.


    Last edited by kbeaag; 12-17-2017 at 09:16 AM.
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    Keeper of the GTT Cookies dieselshadow's Avatar
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    I wouldn't worry about the amount. Once it reaches full, you're done.

    Personally I would add the cooler, change the oil and filter, add the usual back in, start the engine to fully circulate the oil and get an accurate level. Top off as needed. Done.

    If it drains down over time, meh, so what? When you start it back up, it'll fill everything back to where it should be.
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    Quote Originally Posted by dieselshadow View Post
    I wouldn't worry about the amount. Once it reaches full, you're done.

    Personally I would add the cooler, change the oil and filter, add the usual back in, start the engine to fully circulate the oil and get an accurate level. Top off as needed. Done.

    If it drains down over time, meh, so what? When you start it back up, it'll fill everything back to where it should be.


    I agree with what you have said. However, the oil cooler takes the extra amount of oil with the engine running, meaning less oil in the crankcase. Did John Deere with the oil coolers have a different dipstick to show the extra oil? When I get it all installed I will add the extra oil and see what happens to the dipstick measurement.

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    Keeper of the GTT Cookies dieselshadow's Avatar
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    Quote Originally Posted by kbeaag View Post
    I agree with what you have said. However, the oil cooler takes the extra amount of oil with the engine running, meaning less oil in the crankcase. Did John Deere with the oil coolers have a different dipstick to show the extra oil? When I get it all installed I will add the extra oil and see what happens to the dipstick measurement.
    That's why I said to check and top it off right after you shut it down. It won't drain down instantly. Trust me.
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    Quote Originally Posted by dieselshadow View Post
    I wouldn't worry about the amount. Once it reaches full, you're done.

    Personally I would add the cooler, change the oil and filter, add the usual back in, start the engine to fully circulate the oil and get an accurate level. Top off as needed. Done.

    If it drains down over time, meh, so what? When you start it back up, it'll fill everything back to where it should be.
    Quote Originally Posted by dieselshadow View Post
    That's why I said to check and top it off right after you shut it down. It won't drain down instantly. Trust me.
    I agree with Jason.

    kbeaag, you may be overthinking the situation. Oil checked COLD, at the full mark will be happy while running.
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    The factory John Deere/Kohler oil cooler is a 4" x 4" x 3/4" size, and my guess it is not large enough to really make a difference in cooling the oil.
    I would like to install one about 6" x 6"x1" size and install a larger fan to cool the oil. In searching the Internet the majority of oil coolers are way too large...mostly above 11" x 11" size. Some transmission coolers are smaller, but, not that I can locate for the perfect fit to the tractor.
    I'll keep searching.

    Some may be thinking why install a oil cooler now. Well, here is my reason. I have a oil pressure gauge on the Z710A and during the hot summer days here, the temp near 100 degrees and mowing the heat of the engine is most important. My gauge usually registers at 46 psi, but, after several hours of mowing it get up to 55-60 psi on the gauge. That would cllick on ones mind that the oil is very hot and expanding...maybe boiling. Or it may signal something else triggers it to rise.






    Last edited by kbeaag; 12-17-2017 at 12:48 PM.

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    Quote Originally Posted by kbeaag View Post
    The factory John Deere/Kohler oil cooler is a 4" x 4" x 3/4" size, and my guess it is not large enough to really make a difference in cooling the oil.
    I would like to install one about 6" x 6"x1" size and install a larger fan to cool the oil. In searching the Internet the majority of oil coolers are way too large...mostly above 11" x 11" size. Some transmission coolers are smaller, but, not that I can locate for the perfect fit to the tractor.
    I'll keep searching.

    Some may be thinking why install a oil cooler now. Well, here is my reason. I have a oil pressure gauge on the Z710A and during the hot summer days here, the temp near 100 degrees and mowing the heat of the engine is most important. My gauge usually registers at 46 psi, but, after several hours of mowing it get up to 55-60 psi on the gauge. That would cllick on ones mind that the oil is very hot and expanding...maybe boiling. Or it may signal something else triggers it to rise.
    Would think that the oil viscosity should decrease with increased temperature of running a couple of hours
    causing the oil pressure to decrease some.
    Oil flows more freely when less viscous decreasing pressure.
    Notice this on my old Farmall Cub with the oil gauge mounted on the oil filter canister, will drop 5 lbs. or so once
    at operating temp.

    You seem to have the opposite happening.
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    Keeper of the GTT Cookies dieselshadow's Avatar
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    Quote Originally Posted by kbeaag View Post
    I have a oil pressure gauge on the Z710A and during the hot summer days here, the temp near 100 degrees and mowing the heat of the engine is most important. My gauge usually registers at 46 psi, but, after several hours of mowing it get up to 55-60 psi on the gauge. That would cllick on ones mind that the oil is very hot and expanding...maybe boiling.
    Your oil isn't boiling, I can guarantee that. It takes some extreme temps to do that. Pressure rising on an operating and hot engine? Doubtful. More than likely you have an indication issue. See below.

    Quote Originally Posted by Old Cajun View Post
    Would think that the oil viscosity should decrease with increased temperature of running a couple of hours
    causing the oil pressure to decrease some.
    Oil flows more freely when less viscous decreasing pressure.
    Notice this on my old Farmall Cub with the oil gauge mounted on the oil filter canister, will drop 5 lbs. or so once
    at operating temp.

    You seem to have the opposite happening.
    OC is 100% correct. Rising temps equals lower viscosity equals lower pressure.

    I've never seen oil pressure rise on a hotter engine than when cold. Unless you have an exotic oiling system or a variable oil pump like some cars do. I doubt your oil cooled engine has that technology.

    Again, my guess is you have an indication issue. Can you verify with a mechanical gauge?

    Adding an oil cooler won't hurt your engine, only help prolong the oil's life and therefore your engine. It's a great addition to any engine, especially an air cooled one as they tend to run hotter than liquid cooled ones.
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    I'm not too concerned about the higher PSI on the oil pressure, as I'm safe to say it's better than having it to drop during the engine operations. When I first encountered this, I removed the gauge and sensor and returned them to the seller, so sent me a replacement. That didn't change anything...same results on PSI. So, I switch to another oil sensor I had here. No change. These Faris gauges are very reliable. So I discount they are the culprit on the higher PSI reading.

    When I get the oil cooler install, will see if anything changes.

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    If you are running a multi grade oil like 10W30. It's designed to thicken up from engine heat. Transforming from a 10 to a 30 weight thickness.
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