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Old 13-04-2010, 17:40   #16
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I have the Westerbeke equivalent of the Perkins 4-108, with a Hurth hydraulic v-drive. It freewheels when we are sailing, regardless of whether we have it in gear or not. I had the Hurth re-built last year, when we bought the boat, and the shop said no worries about freewheeling. Since the tranny is hydraulic, rather than hard geared, freewheeling causes no problems.

Does this line up with what others here know about the Hurth gearboxes?
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Old 13-04-2010, 18:57   #17
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I am not concerned with freewheeling while sailing...although

The problem is that while idling in neutral, the prop still turns. This makes the boat go forward. You can never be stopped completly. I refuse to believe this is normal.

I can deal with it, but would rather not have to. I can replace the stuff on the inside of the borg warner 71c, however, I'd like to find someone who already has.

Perhaps I can avoid buying more parts than I need.
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Old 13-04-2010, 19:59   #18
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Well, prop turning in neutral is no good. Hydraulic traany's are beyond me, but if the prop still turns in neutral, my guess is that there is a clogged valve or fluid channel somewhere in that transmission...maybe a hosed up linkage.
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Old 14-04-2010, 10:05   #19
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With the engine off, I can feel something inside rub when I turn the coupling by hand, it (in my mind) could be a warped clutch plate or something that just barely grabs as it spins(when it is running). This would explain why I can stop it with my foot or hand, but when I release, it picks up speed again.

As far as hydraulic red gears go, when the engine is not running there is no pressure, thus no possible way to engage the gear (at least on my model)

I remember hearing something about only being able to freewheel a hydrulic transmission/reduction gear for about 4 hours before bearing damage can occur. (this would be due to the fact that since there is no pressure in they system the fluid does not lubricate the bearings.

As anyone else heard about this?
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Old 14-04-2010, 10:21   #20
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Goldie - My trans has been freewheeling on this engine for about 30 years and is still working. I changed the fluid, it was AFT along, and have decided to just deal with it. It does stop freewheeling when I increase my RPM's in nuetral. I use this as a back up if it is critical to holding my position. Not the ideal situation, but so far I have made it work.
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Old 14-04-2010, 17:10   #21
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clutch pack sticking I'd say
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