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DLTX Throttle Shaft Bushings

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john

12-06-2000 14:51:43




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To all,

I have a '49 B which I decided needed carb work which included a new throttle shaft and valve assy ($100 ouch!). Tractor now runs pretty good but I think that the throttle shaft is still a bit loose in the bushings. Does anyone out there have any experience on how to get these out and install new ones?? Thanks.




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Cam

12-08-2000 08:27:21




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 Re: DLTX Throttle Shaft Bushings in reply to john, 12-06-2000 14:51:43  
I just got a brass punch from Robert's Carb Repair for getting these bushings out. It is round with a machined shoulder so it fits inside the bushing, and then the shoulder matches up square with the bushing itself. Makes it real easy and almost foolproof. Use wood backing and the bushings tap right out. My replacement bushings were not as long as the originals, so the item about pressing them in flush with the bore may not look exactly as it did before. I also had a one-piece bottom bushing and cap. Ended up cutting this to length and reinstalling after the new bottom bushing was installed. And I did need both the new shaft and bushings. The new bushings are bronze/brass, and the old ones were steel, hence the wear on the shaft.

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clooney

12-07-2000 03:11:34




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 Re: DLTX Throttle Shaft Bushings in reply to john, 12-06-2000 14:51:43  
John, some DLTX's have a bottom bushing that has a closed end in it, others have a metal plug over the bottom bushing bore & others don't have a bushing bore that goes all the way through into the main throttle bore(step in the bore). In either case drive the lower bushing or the plug out with a rod inserted through the top bushing, then tap threads in the top & (bottom bushing if it is still in there) to accept a bolt, then thread a bolt in a few turns & drive the bushing out by driving on the bolt with a rod inserted through the opposite bushing bore. When installing the new ones make sure the new bushings are flush with the inside of the carb. bore or you will have a poor idle & an off idle lean out because incomming air will by-pass the idle holes by going around the ends of the throttle plate...

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John T

12-06-2000 18:30:42




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 Re: DLTX Throttle Shaft Bushings in reply to john, 12-06-2000 14:51:43  
John, I select a straight pin punch thats almost the bore size and drive the old ones out. I use the same punch to put the new ones in (but try and press more than hit) and be sure and get them as deep down in the bore as possible. Often they need a tad of rat tail filing near the ends to remove any burrs after they have been pressed in, then I use petroleum jelly on the replaced throttle shaft. I loosen the brass butterfly plate so I can adjust it perfect centered then tighten the 2 screws down. If the shaft/bushing fit isnt tight, they suck air there (lean out) and dont idle properly. Piece of cake. Ol John T

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