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Old 04-21-2006, 09:48 AM
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Default Diesel trolling valve

ran on to this term while checking out a boat-- What does it mean???
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Old 04-21-2006, 10:00 AM
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Default RE: Diesel trolling valve

Most diesel-powered sportfishermen cannot go slow enough for certain kinds of fishing, like slow-trolling live baits. A trolling valve allows the transmission to have a controllable amount of 'slip' so the propeller turns more slowly, thus slowing the boat's speed.

You just have to remember to close the trolling valves before jamming on the throttles or you risk damaging the transmissions (don't ask me how I know this but I do).

Sam
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Old 04-21-2006, 10:17 AM
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Default RE: Diesel trolling valve

Velvet drive transmission??---- Thought about installing small diesel driving a hyd. pump to run a hyd pump with a prop mounted on the caviation plate on an O/D --- then I saw almost the same thing in a sail boat---
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Old 04-21-2006, 11:04 AM
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Default Re: Diesel trolling valve

Most of the newer boats have electronic controls. The trolling valves work much the same way as the older ones- allowing the transmissions to slip on purpose to allow slower trolling speeds without having to drop engine RPMs. On older boats, you had to remember to disngage the trolling valves before running the boat at speed, otherwise you would damage the trannies. Now, the electronic controls automatically turn off the trolling mode when the throttles are pushed up to a certain point, allowing you to run. Also, the new system allows how MUCH slippage is in the trannies, which gives you the ability to troll super slow, or you can advance the throttles a little to create less slippage and more speed. Pretty amazing technology. ZF has a very good system.
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Old 04-21-2006, 11:36 AM
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Default Re: Diesel trolling valve

I remember doing that on Grandad's power troller with a twin disc transmission.
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