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post #11 of 28 Old 03-28-2013
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Re: Hurth Transmission not Engaging

Meanwhile the boat looks sad at my pier

Lessons learned are opportunities earned.
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post #12 of 28 Old 03-28-2013
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Re: Hurth Transmission not Engaging

Twin disk trannys fit the same bolt pattern as the Hurth or Z drive, but are far better trannys, and cheaper as well.
Hurths tend to unscrew and eat the dipstick, and pull it thru the gears and the bearings. I have had that happen to me, and friends have had the same experience. I wrapped a single strand from stainless 1x19 rigging wire thru the hole between the top bolts ,bent a 90 degree bend in the end and stuck it thru the vent hole in the dip stick, to stop it from unscrewing. No problem since.

Brent Swain, Boat designer, Builder, and author of "Origami Metal Boatbuilding"
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post #13 of 28 Old 03-28-2013 Thread Starter
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Re: Hurth Transmission not Engaging

Thank you! When I was looking at the parts diagrams for both the engine and the transmission, I did not see a part that looked like the one that fell out of the Starter when we pulled the starter out of the engine. It turns out that those almost exactly match the springs that are part of the damper plate. That makes me feel a lot better about the way the engine died. No reference that I have found, after searching for some time, showed pictures of the damper plate. Now that I knew what to look for, I was able to do a search and find what a damper plate looks like and I'm almost entirely convinced that that's the correct part. Or, more correctly, the part that died.

Of course, that does not rule out a transmission problem, but at least this is an easier, or at least less expensive, fix.

- Jim
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1975 Albacore 15


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post #14 of 28 Old 03-28-2013 Thread Starter
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Re: Hurth Transmission not Engaging

I should add, when we shifted the lever at both the transmission and up in the cockpit, you could feel the transmission slipped into neutral. Hopefully that's a positive sign.

- Jim
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post #15 of 28 Old 03-28-2013 Thread Starter
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Re: Hurth Transmission not Engaging

One last question, is the flywheel normally wet with oil?

- Jim
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post #16 of 28 Old 03-28-2013
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Re: Hurth Transmission not Engaging

I concur Jim, I felt neutral going by it, both when you were shifting with the lever and when I did it by hand, but felt no engagement at all at the extremes of movement where it should have been in gear.

FYI - other folks, we disengaged the linkage and tried to put it in gear manually, didn't change anything, there is adequate movement of the throw arm.
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post #17 of 28 Old 03-28-2013
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Re: Hurth Transmission not Engaging

I've heard good things about the TwinDisc transmissions. Definitely worth some research if you wind up having to replace the gearbox.

For comparison's sake, here's a reference that will give you details on your current tranny:

Hurth 5-10-20 Service Manual

BTW: I noticed that the drop (the offset between the tranny's input and output shafts) for the HBW-5 is 62mm; the drop for the HBW-10 (which became the HBW-100, which became the ZF-10) is 72mm. That shoots my "same case" theory in the arse.

Books are good -- much better than guesses
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Re: Hurth Transmission not Engaging

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Originally Posted by jimgo View Post
One last question, is the flywheel normally wet with oil?
Uh-oh

I don't know about the Universal (Kubota block), but my Perkins flywheel was bone dry when I pulled it -- and Perkins are notorious leakers.

I hope the oil doesn't turn out to be more problems...


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post #19 of 28 Old 03-29-2013 Thread Starter
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Re: Hurth Transmission not Engaging

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Meanwhile the boat looks sad at my pier
Not as sad as I did when we left your pier tonight!!!

But, we're making progress. Slow, painful, and expensive, but we're making progress. Thanks again for the slip!!

- Jim
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Re: Hurth Transmission not Engaging

It wasn't super wet, but the pieces from the damping plate were dark, like they had been covered in oil, and it looked like some of the teeth from the flywheel had oil on them. Not a lot, not super high up the flywheel, but on the teeth. There was some oil in the bilge, too, and my dad's idea was that perhaps the back seal had a slow leak that was causing there to be some oil inside the engine and inside the bilge.

Well, hopefully I'll learn more in the next few days.

- Jim
Home: Western Philly 'burbs
1980 Allmand 31
1975 Albacore 15


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