Throttle won't hold position! - SailNet Community

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  #1  
Old 08-19-2014
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Throttle won't hold position!

I have a Beneteau 361 which has a Teleflex single arm throttle to control both forward/reverse transmission and throttle. Photo attached. Overall it works fine except it won't hold position where I want it. I want to run the engine around 2800 rpm for cruising and the engine runs up easily but when I remove my hand from the throttle it pulls back by itself. Only seems to hold around 2000 rpm. I've tried tightening the set screw at the base of the throttle arm and this didn't do any good, still slips. Is there another adjustment I can do or replace a friction plate or something or am I stuck replacing the whole assembly?
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Throttle won't hold position!-throttle.jpg  
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Old 08-19-2014
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Re: Throttle won't hold position!

put a u-bolt or rope wire clamp on the cable. Tighten gently until tension is sufficient.

T37Chef and nccouple like this.

Last edited by weinie; 08-19-2014 at 10:47 AM.
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Old 08-19-2014
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Re: Throttle won't hold position!

You can add a little clamp on top of the shielded part of the cable. You do it up just the right amount to add a bit of friction to the passage of the inside cable. Too much and the cable does not move freely, too little and it slips.. Just need to play with it (tightening 1/8th or a turn at a time). I have had the problem on two boats. In one case I got a special clamp (from Edson?) at great price. In the other case basically a tiny jubilee clamp for a couple of bucks at a boat store in Antigua. Both worked.
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Old 08-19-2014
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Re: Throttle won't hold position!

There should be two springs on the throttle connection to the fuel injection pump. I'm guessing one may be tired or have popped off.
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Old 08-19-2014
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Re: Throttle won't hold position!

The U clamp is a great idea, wish I had thought of it.
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Old 08-19-2014
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Re: Throttle won't hold position!

My boat has the clamp to add friction, but the throttle still slips. As the engine warms up it gets enough friction to hold at 2800rpm.

I'll check to make sure that both springs are on there. Page 157-158 of the service manual explains how to inspect them. On my 2GM20F larger spring (main spring) should be 80mm long with 20mm of coils, and the smaller spring (secondary spring) should be 23mm long with 10mm of coils.
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Old 08-19-2014
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Re: Throttle won't hold position!

Actually what you want is a cable brake like this

TELEFLEX 044386 THROTTLE CABLE BRAKE

Note that the bolt in the picture is in backwards. The head of the bolt should contact the cable.

While cable anchor clamps will work they are harder on the cable sheath.

Brian
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Old 08-19-2014
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Re: Throttle won't hold position!

I sailed on a boat that used a bungie cord to keep the throttle from slipping back down. Probably not a good long term solution....
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Old 08-19-2014
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Re: Throttle won't hold position!

U bolt is a awesome idea. I've been rigging a piece of rope to the throttle when needing more speed. I've received a lot of great tips and tricks just by reading random post here. Hopefully pased a few along also. U bolt is added to my shopping list.
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Old 08-19-2014
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Re: Throttle won't hold position!

Quote:
Originally Posted by saillife View Post
Actually what you want is a cable brake like this

TELEFLEX 044386 THROTTLE CABLE BRAKE

Note that the bolt in the picture is in backwards. The head of the bolt should contact the cable.

While cable anchor clamps will work they are harder on the cable sheath.

Brian
That looks like what I have.
I figure the idea is that the spring in/on the engine returns the engine to an idle should the throttle cable break. The friction or restriction needs to be close to the control
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