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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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TSX775 on 59 880

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LandonT

11-17-2020 18:23:01




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A little help/insight, please.
I bought a 59 Oliver 880 with a TSX775 Marvel Schebler Carb. The listings and rebuild kits and shop manual say this carb is for 550/660, though a Steiner listing hints that 880s did have a large body Schebler at some point.
It is running lean, and a rebuild kit helped some but not a lot. Can't get it to run rich, and have to run with choke pull out 1/2" to get it smooth.
Is this just flat out the wrong carb for the tractor?
Since it is large body, could I size the venturi, idle, and nozzle for an 880, maybe borrowing that used by a 1600?
Or should I ditch it and replace with the aftermarket Zenith?
Thanks for the thoughts.

- Landon

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LandonT

11-23-2020 19:09:03




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 Re: TSX775 on 59 880 in reply to LandonT, 11-17-2020 18:23:01  
Quoting Removed, click Modern View to see

Thanks, Chuck, even slightly snug, they had to be loosened to align the 4 bolts that tie the manifolds together before I could snug up the assembly.

Which brings up a question about the dowel pins for the intake manifold, is it possible those dowel pins are keeping the intake manifold from being snug to the face of the head? They certainly seem tight. I suppose you could relieve the back of the intake manifold flange to make certain they do not interfere...any stories about this?

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chucksoliver77

11-23-2020 18:51:51




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 Re: TSX775 on 59 880 in reply to LandonT, 11-17-2020 18:23:01  
When you put the manifolds back together did you tighten all the way tight before you put it on? You should just snug them up and then mount it on the head tight, then tighten the 4 manifold bolts. This allows the intake and exhaust ports to align themselves to the head.



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LandonT

11-23-2020 15:43:17




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 Re: TSX775 on 59 880 in reply to LandonT, 11-17-2020 18:23:01  
Some progress, replaced the manifold to head gaskets and the gasket between intake and exhaust manifold, perceiving that the gasket goes on the exhaust side of the blockoff plate.

The intake and exhaust manifold don't seem to mate very well, tough to get the last bolt lined up.

Seemed to make the problem worse, replace condensor, no progress. Has been difficult to start when warm, I thought it was a mixture issue, but turned out to be a bad coil. I replaced the coil and it started right up and I even saw a little black smoke(rich) So we are back at square one. I think I'll check the float level again, as I can tell it is running out of gas when accelerating.

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scootergmc

11-17-2020 21:05:18




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 Re: TSX775 on 59 880 in reply to LandonT, 11-17-2020 18:23:01  
The parts book lists a tsx775 for the 770.
Could it be someone installed a 550 (or similar four cylinder) TSX775 with inadequate jetting?



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chucksoliver77

11-17-2020 19:50:51




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 Re: TSX775 on 59 880 in reply to LandonT, 11-17-2020 18:23:01  
Maybe you have a vacuum leak between the intake manifold and the head making it run lean. That carb should work without any modifications.



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LandonT

11-17-2020 23:08:30




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 Re: TSX775 on 59 880 in reply to chucksoliver77, 11-17-2020 19:50:51  
Thanks, I bought a manifold gasket set, so will install it and see. Good to hear.



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super99

11-18-2020 03:53:32




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 Re: TSX775 on 59 880 in reply to LandonT, 11-17-2020 23:08:30  
To check for air leak around the intake, with it running, give a light spray of starting fluid around the manifold and carb. If the motor speeds up, there's your leak.



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ziffel

11-18-2020 04:13:04




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 Re: TSX775 on 59 880 in reply to super99, 11-18-2020 03:53:32  
I'm sure you did this but drain the tank and make certain it is clean. Also remove the sediment assembly and look for restrictions. I had a rubber fuel line with a partially collapsed inner wall.



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LandonT

11-19-2020 21:46:14




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 Re: TSX775 on 59 880 in reply to ziffel, 11-18-2020 04:13:04  
Thanks, I'll replace that line this weekend, believe it is 5/16...



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