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post #1 of 25 Old 07-15-2019, 10:37 PM Thread Starter
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Simplicity 7018 overheating

Hello everyone! I've got a Simplicity SOVEREIGN 7018 hydrostatic tractor with a 18 horsepower single cylinder engine on it. I got it about 3 years ago. It worked for me for about a year and then quit because of carburetor problems and i just let it sit till here recently. I replaced the carb and got the engine working fine but something wasn't right with the transmission. When I'd put it in forward it would bog down the engine and almost quit moving. So i parked it and decided to replace the oil in the tranny. I called my grandpa and he said to get any hydrostatic oil and put it in there. It didn't sound quite right but i gave it a shot. Poured the new oil in an cranked her up but the transmission wasn't working right(i think it was 15w-30 bad boy oil but I'm not sure. If its important i can double check). I didn't do anything with the filter by the way except empty it and fill it up with new oil. Then i looked at the trans specs on Tractor Data.com(which i should have done in the first place) and it called for 3 quarts of ATF type F oil. I got the right oil, poured it in and the transmission began working right. But the engine seems to be overheating. Just after about 5 minutes of riding around the yard, engine parts that should be warm were impossible to touch. I changed the engine oil with 5w-30 and put some Lucas oil thickener in(possibly using wrong weight of oil?) and took of the engine cover and cleaned out the cooling "ribs" on the engine but still it heats up pretty bad. I'm a bit stuck here so any help would be appreciated. I though that maybe i damaged the trans with the wrong oil and now its over stressing the motor. But when we the tractor ran 3 years ago it plenty powerful and never overheated. So I'm stuck! Any help would he appreciated!

I'm in South Carolina and its pretty hot down here.
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post #2 of 25 Old 07-16-2019, 03:27 AM
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Re: Simplicity 7018 overheating

Check that all the covering tins are present, including around the fan on the crankshaft, that the fan is properly secured to the crankshaft so it's blowing air at full speed, and that it's clean and the cover around it is clean on the inside.

And perhaps get an IR thermometer gun to read engine temps, as there are many parts of the engine that are legitimately too hot to touch with your hand, but would not show that the engine is overheated.
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post #3 of 25 Old 07-16-2019, 12:58 PM
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Re: Simplicity 7018 overheating

There could be two problems.
Engine heating; carb too lean, either open mixture screw or run with some choke to test.
Engine heating; Maybe wasn't carb, maybe poor spark. Use an inline spark tester, the type you can adjust gap.
Oil shouldn't make much difference to hydrastat.

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post #4 of 25 Old 07-16-2019, 01:14 PM Thread Starter
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Ok, i took of all the covers except the flywheel/fan cover. But i shined a light at it and turned it and it looked fine. But I'll take that cover of just to check. It's gonna be quite a project. And yes as far as i know, all the tins are present.

I'll see if I got a thermometer to measure the temp.

Thanks again!
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post #5 of 25 Old 07-16-2019, 10:27 PM
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Re: Simplicity 7018 overheating

I have the identical tractor in Allis Chalmers colors and K361 engine.... dont want to scare you BUT..... those engines, after some 30 years of good hard use, are prone to eventually have issues with the valve seats coming loose in the head, then they will leak hot air up into the valve cover and/or blow fuel back out the carb and generally run like crap... if that continues too long then head may not be repairable and a replacement head is not available.... AFAIK

I would suggest... before you go any futher... pull off the head and inspect the valve seats... if they are not loose... have new ones put in anyway... if they are loose.... well that would not be good news .... BUT... it would be easy to swap in a lower hp K series engine.... Hopefully this is not your issue but it is fairly common with the K361... steel seats in an aluminum head + 30 years at WOT cutting grass... __it Happens.

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post #6 of 25 Old 07-17-2019, 07:57 AM Thread Starter
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All right, I'll sure take of that head and take a peek inside. I got this tractor from my grandpa, and i know he basically did not use it at all. It just sat in his backyard. But there's no telling what the tractor seen before it got in his backyard. But i also know he replaced something in the engine with his own fabricated parts. I forget what he did but I'll ask him and let you folks know. My grandpa likes collecting old stuff and fixing it, so you know how that goes.
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post #7 of 25 Old 07-17-2019, 10:23 AM
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Re: Simplicity 7018 overheating

Quote:
Originally Posted by Andrew2 View Post
My grandpa likes collecting old stuff and fixing it, so you know how that goes.
Well Ya... I spose I do resemble that Remark... Lol

My AC718 was freebie... not running when I got it... when I did get it started it was blowing fuel back out the carb so I pulled the head and the valve seats literally fall out of the head, its too far gone to rebuild so Im looking for a smaller K series to put in the tractor... the 10-16hp Ks dont have overhead valves so they dont have the same issues. Its just a matter of finding one with the correct base and output shaft.

Nice tractors tho... Ive had quite a few Simplicity built machines and Im currently using one of their front mowers. If your lucky and can still have new seats installed you would have a nice tractor... I kinda doubt it has any transmission issues because that seems quite rare with Simplicity.. they are usually pretty tuff tractors.

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post #8 of 25 Old 07-18-2019, 06:58 PM Thread Starter
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Talked to my dad... he said grandpa fabricated his own valve seat. Its gotta be that. And i noticed the engine ain't as powerful as it used to be.

I'm runnin a pretty busy schedule right now... working part time as a farm hand, working around my farm every other spare minute so bear with me. Sonas soon as i get a chance I'll get in that engine. Thanks folks!
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post #9 of 25 Old 07-18-2019, 09:16 PM Thread Starter
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Thats if I'm right. I what grandpa did had something to do with valves. Not quite sure what
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post #10 of 25 Old 07-18-2019, 11:36 PM Thread Starter
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I probably should have mentioned this earlier, but i just remembered myself that when the tractor still ran it would leak oil from under a little cover on the left side on the engine when the tractor would heat up.

Other threads in this forum mentioned clogged crancase breather producing similar symptoms. Any opinions what it could be?

Thanks again.
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post #11 of 25 Old 07-19-2019, 05:17 PM Thread Starter
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Update: took apart the engine, valves and valve seating looks normal. No rough edges or gouges. I also measured compression before tearing it apart and it was right at 120 psi. So looks like between the the compression test and visual inspection of valves i can be sure everything is all right with them.

Next step is take of flywheel/ fan cover and inspect for blockage or some kind of deformation. I'll be doing that tomorrow beacuse i have to take of the driveshaft.
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post #12 of 25 Old 07-19-2019, 06:28 PM
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As you changed the carb, any chance the new one is running lean?

You check the valve clearances when you were checking?
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post #13 of 25 Old 07-20-2019, 12:49 PM Thread Starter
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Never checked or adjusted valve clearance so i haven't checked on my engine and don't really know what to check. I'm gonna have to look on YouTube. 🙄😶

As for the carb running lean, i screwed the jets in all the way, backed them out 2.5 turns and then went from there backing them out slowly until the engine would run normal and start easy and go through all rpms.

Thanks for all your help!
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post #14 of 25 Old 07-20-2019, 04:38 PM Thread Starter
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I'd have to say it was runnin a little lean according to the spark plug color.
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post #15 of 25 Old 07-20-2019, 05:58 PM Thread Starter
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Update: my grandpa strongly recommended that i do a valve reseating job while I'm there so I went for it. I'll need to replace the valve seal on the exhaust valve because mine is all tore up. Any ideas where to find it?

(This is my first time doing this so i might make some pretty silly mistakes so forgive me please)

Last edited by Andrew2; 07-20-2019 at 06:34 PM.
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