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Case Tractors Discussion Forum

1970 M 570 AT

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01-13-2018 17:29:41

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I finally have the unit running, but I have discovered a few issues. Any help and direction will be welcome guys n gals.
1st. I have rebuilt the zenith carb and it idles and throttles up ok. I have set the main and idle jet to where it is responsive and seems to run with the correct mixture. I had noticed low oil pressure approx. 20psi. I checked the oil dipstick and it is overfull and very runny. smells like fuel also. I attribute this to the previous owner lack of maintanence and his common fix to it running poorly to tap on the carb to more fuel to go into the bowl. Prior to cleaning the carb I had an intermittent fuel flow problem that would go from nothing to fuel pouring out of the body. (Bad needle and seat also improper float level adj)
If it was running too rich, It was probably dumping fuel into the cylinders and washing the sleeves and fuel going past the rings into the crankcase. Correct?
I am going to change the oil and see if this improves the oil pressure.
the other issue that I noticed is that it doesn't want to get out of its own way. It has a 4sp tranny with a torque converter drive. as soon as I go from the TC to direct drive it wants to die and seems very under powered. I can push in the clutch and the engine rpm will come back to normal, but this doesn't seem right. It also had a loader on it and when I raise the bucket It also wants to die. I haven't checked the plugs or dist cap n rotor for any clues. Could it be only running on 3 cylinders yet seems to idle ok?
It is also not charging. I have some serious electrical issues inside the cab, which I can clean up. None of the instrument cluster gauges are hooked up nor the ignition. It is all cobbled and screwy looking. Could there be a related problem electrical that I should look for? Am I not getting the correct power to the engine electrical for it to run properly. I know this is a lot to answer, but I am only looking for a starting point.
My direction is oil pressure, compression, plugs, wires, cap rotor, alternator, and then cab stuff.
Direction on what to keep an eye out for would be appreciated.
I have also started a project journal on this forum in my hopes to restore this unit to good working shape.
Thanks all!

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01-14-2018 18:01:07

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 Re: 1970 M 570 AT in reply to homestead1250, 01-13-2018 17:29:41  
Just gave you a long ramble on your journal, just basic stuff to check. Which place would you rather have stuff posted?

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01-15-2018 19:51:13

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 Re: 1970 M 570 AT in reply to kevinthefixer, 01-14-2018 18:01:07  
Thanks for your response kevin. I appreciate your info that you put on my project journal. It is ok to post our correspondence there as it may help others that reference the journal in the future. You are also welcome to send me an email as I provide some info on my progress. I will be getting to tackling the oil change, and diagnosing the ignition issues this weekend. It has been really cold here in Wyoming for a stretch and I don't have a shop large enough for the tractor too. I have my woodshop which sole purpose is implied with the name. This is my resoration project and I am excited and the same time confused as I discover new issues. I have a good mechanical backround as my father (rip) was a combination of henry ford and Nicola tesla and I learned a great deal from him. I can only believe that he is helping me through this resto in heaven. By the way my name is also kevin.
I will keep you posted and thanks again.

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01-14-2018 08:00:02

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 Re: 1970 M 570 AT in reply to homestead1250, 01-13-2018 17:29:41  
Those gassers are hard to keep happy with the modern gas , 20 lbs oil pressure is decent and acceptable . imho ,the least of your troubles.,, I have noticed the hundred and 30 series Gassers dont have the kikaz the Letter series Case tractors have ,the 570 is a close cuzin ,.,.but You Can Make them Deliver . You mite try petronix ignition , you can swap over for 150 buxand will never look back ,or jet Blue Gas mite perk it up ,.Zenith carbs are my favorite but they can be a pain . i never tinkerd much with float levels ,,.. not sure why others have not chimed in ,,.. you got alot here to talk about ,.. i have noticed anything over 3 paragraghs seems to flood out on a busy day of posts ,. especially if you are not aknown regular poster

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