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#1
05-20-2019, 01:04 AM
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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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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons? ... or has built a record breaking DOHC hemi four cylinder Pontiac? ... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967) |
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#2
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.
__________________
Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons? ... or has built a record breaking DOHC hemi four cylinder Pontiac? ... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967) |
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#3
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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#4
07-12-2019, 02:38 AM
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Where's "here"?
__________________
Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons? ... or has built a record breaking DOHC hemi four cylinder Pontiac? ... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967) |
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#5
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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The difference between inlaws and outlaws? Outlaws are wanted |
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#6
07-15-2019, 12:55 AM
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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?
__________________
Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons? ... or has built a record breaking DOHC hemi four cylinder Pontiac? ... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967) |
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#7
07-16-2019, 09:49 PM
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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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#8
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... 
__________________
Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons? ... or has built a record breaking DOHC hemi four cylinder Pontiac? ... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967) |
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#9
07-17-2019, 10:36 PM
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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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