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Ultramatic throttle linkage adjustment
Not too shy to talk
Joined:
2018/4/16 18:03
From Indiana
Posts: 15
I'm having issues with the direct drive clutch engagement on my recently purchased 55 Clipper. The previous owner did a carb rebuild and the carb seems to work well. However, I suspect (hope) that the direct drive clutch engagement issue (moaning & slipping) is related to linkage adjustment. In service bulletin 340, it shows how to adjust throttle linkage length, but does not indicate where on the shaft to adjust (set) the transmission cross shaft collar, in relation to the threaded throttle shaft. Any recommendations? Midway in the threaded portion of shaft or so far from either end? Mine was set at the far (firewall) end of the threads, which seems an extreme position. Figure in service bulletin 340 shows collar somewhat midway in threaded portion.

Posted on: 6/29 12:56:17
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Re: Ultramatic throttle linkage adjustment
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Joined:
2007/4/20 17:54
From Fresno CA
Posts: 15129
If I am understanding your question there may be two adjustments involved. The 55-6 service manual starting on page 52 of the Twin Ultra section has you adjust the carb part of the rod to get a couple of conditions in the overall linkage. Once the overall conditions are met you then adjust the throttle linkage cross piece to get the 3 1/2" distance between the ultra portion and the dash as mentioned in bulletin 340. If the parts are the correct items and the overall rod length is correct the throttle linkage adjustment piece should fall about in the middle of the threaded portion.

Posted on: 6/29 13:35:45
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Howard
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Re: Ultramatic throttle linkage adjustment
Not too shy to talk
Joined:
2018/4/16 18:03
From Indiana
Posts: 15
when I read SB 340, it shows the 3.5 inch distance between the acceleration linkage center screw and the dash and says nothing about the distance of the Ultramatic lever to the dash. Am I reading it wrong?

Posted on: 6/29 13:45:46
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Re: Ultramatic throttle linkage adjustment
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Joined:
2007/4/20 17:54
From Fresno CA
Posts: 15129
If you have the overall 3 1/2 then I would wonder if the lever on the side of the trans is in the proper place. If that was not clamped on the throttle shaft at the proper spot then it would make the front end of the throttle linkage wrong. You might check the bottom end adjustment as per page 52 in the SM to see if the lever is clamped onto the shaft at the proper location.

Posted on: 6/29 13:58:01
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Howard
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Re: Ultramatic throttle linkage adjustment
Not too shy to talk
Joined:
2018/4/16 18:03
From Indiana
Posts: 15
I adjusted the transmission rod collar to the mid-range of the accelerator threaded rod & took the car for a drive. For the first mile or so, there was still slipping in direct drive, but the more I drove it, the slipping seemed to diminish. (Maybe clutch material was slightly glazed.)Mostly present under light load or deceleration only. Didn't moan at all & car seems to coast (decelerate) easier. Previously, it was like there was an anchor tied to it. Whenever you let off the gas, she would really slow down. Drives pretty good for having sat soo long. Only 1500 miles in last 20 years.

Posted on: 6/29 14:42:28
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Re: Ultramatic throttle linkage adjustment
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Joined:
2007/4/20 17:54
From Fresno CA
Posts: 15129
You really need to check the bottom end too just to be sure the geometry you are relying on for the rest of the linkage is correct. Once that has been verified go back to the top and see if it still wants to be where you have it. It may be OK at the bottom and the car will do well with where you placed the top end but throttle linkage adjustment is so critical on an Ultra. Among other things throttle linkage controls the amount of clamping pressure applied to the high range clutch plates. If a misadjustment allows those discs to rotate against each other a burned high range clutch happens very quickly.

Posted on: 6/29 15:06:42
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Howard
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