#1  
Old 05-20-2019, 01:04 AM
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Jack Gifford Jack Gifford is offline
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Default HydroStick failure

After five years of good service the front clutch quit working in the HydroStick of my '59 GMC (no 2nd or 4th gear). I got it out and apart and the front ring land of the oil delivery sleeve is collapsed, preventing sealing to the front hub. The steel thrust washer had "chewed" the face of the delivery sleeve, but I don't know why. Fixing it is a simple matter of replacing the sleeve and washer, but my concern is understanding why it happened. Also, the anti-rotation tang of the washer is chewed away. Anybody ever have such a failure of a DualRange Hydramatic?
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Old 05-21-2019, 02:17 AM
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When I first discovered the worn-away tang of the steel washer, I thought that might explain the damage to the sleeve. But on second thought- the tang would keep the washer rotating with the intermediate shaft (usually near engine speed). Huh? It would make more sense to me if it were designed to be anti-rotation to the sleeve, so that relative motion would be between the steel washer and the bronze washer in front of it? So I'm faced with two puzzles- why this design, and why did it fail.
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Old 07-11-2019, 07:01 PM
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We have a local here named Sweeny who builds those. My buddy has one behind a 50s Caddy motor in a 40 Ford..
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Old 07-12-2019, 02:38 AM
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Jack Gifford Jack Gifford is offline
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Where's "here"?
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Old 07-12-2019, 07:48 PM
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I have been doing those units for 30+ years and I have never seen that happen...unless you have an end play issue
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Old 07-15-2019, 12:55 AM
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Jack Gifford Jack Gifford is offline
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stevep- Can you tell me why the steel washer at the front of the delivery sleeve is "tanged" to the intermediate shaft instead of being [somehow] fixed to the delivery sleeve?
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Old 07-16-2019, 09:49 PM
mgarblik mgarblik is offline
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Jack, do you have an exploded view of that assembly? I know little about those transmissions, but if something doesn't make sense to you I wonder if it was assembled incorrectly 5 years ago and just ran that way until it failed?
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Old 07-17-2019, 02:04 AM
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Whatever the explanation, I'm the only one to blame. And yes, anything's possible- I got the endplay wrong, face of the sleeve wasn't perfectly flat, or a dozen other things. Until this failure, I hadn't given much thought to the design of this area. But studying it now I'm puzzled about why two steel surfaces are constantly running against each other at near engine speed. Other similar areas of the hydro typically use bronze-against-steel. That's the first part of the puzzle. The second part is- why does this design usually work fine, but failed this one time.
There's little chance of finding someone to shed light on this, so I'll probably have no choice but to replace the parts and cross my fingers. But... god, how I hate pulling/replacing this thing...
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Old 07-17-2019, 10:36 PM
mgarblik mgarblik is offline
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Agree, steel running on steel doesn't seem normal. Again, no personal experience with this trans, but any chance one of the steel pieces originally had a bronze facing that has worn off due to lack of end play or if only one side had a bronze facing was installed backwards? I guess when you get the new parts, that may answer those questions. Good luck with it.
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