Hurth HBW-5 tranny slipping??? - SailNet Community

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Old 05-17-2006
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Question Hurth HBW-5 tranny slipping???

I have a universal 5411 diesel engine in my Ericson 28+ sailboat and I recently had my top speed drop from 6 to 2 knots. The transmission still works in fwd & rev. it just has lost its push? I wonder if the transmission can be fixed or will this call for a new or rebuilt tranny? The fluid level seems ok and the engine runs fine. It is tough to find much info on this kind of problem, got any suggestions?
Thanks, Phil
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Old 05-17-2006
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Do you know that your prop shaft speed is actually down? What kind of prop are you running? Is there unusual vibration?
Maybe you just have a plastic bag wrapped around your prop!?!
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Old 05-18-2006
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or some vegetation? When our boatspeed drops under power, one of us usually goes for a swim to clean off the prop.
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Old 05-18-2006
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Growth on the prop can be a serious problem if you haven't painted the prop with antifouling paint of some sort.
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Old 05-19-2006
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I am not a fan of the suggestion of painting your prop - if it is bronze. If you use just an antifouling you run the risk of creating an electrolosis situation b/c of the metal in the paint. Also, I think you can cause your prop to be less effcient or even unbalanced if the paint is lumpy or not even. I think it is better to dive your prop and scrape it regularly.

Also, I am curious why you think it is your tranny slipping. What other 'symptoms' do you have? Are your RPM's still reaching max?
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Old 05-19-2006
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The Hurth gearboxes normally locks or do not lock. Slipping is next to impossible,at least I have never seen or heard about any! Your problem probably lis somewhere else like fouled prop or bottom. Is Your RPM still the same?
LaLeLu:
How is Your 'problem' going?
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Old 05-21-2006
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Quote:
Originally Posted by haffiman37
LaLeLu:
How is Your 'problem' going?
Probably going to be out of the water for another month. Glass work is being done, waiting for replacement drive train parts.
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Old 05-21-2006
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I wish You the best!
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Old 05-22-2006
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I wish You the best!
Here's what she looks like now...

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Old 05-22-2006
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I hope it is only the pic color that is a bit distorted, the some what brownish color indicates a bit too much accelerator in the polyester. What kind of strut are You planning to install?
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