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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel > Yanmar 2GMF, throttle return spring too strong
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Thread: Yanmar 2GMF, throttle return spring too strong Reply to Thread
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Topic Review (Newest First)
10-30-2013 05:15 PM
rikhall
Re: Yanmar 2GMF, throttle return spring too strong

Ours was just tight enough that the engine maintained the speed we set it at and didn't gradually slow down.

Rik
10-30-2013 10:46 AM
redline
Re: Yanmar 2GMF, throttle return spring too strong

If adding a clamp on the cable as pictured above (or the Teleflex version), it's best to put it as close as possible to the control lever end of the cable. If the cable length is significant and/or has several bends, it will add "sponginess" if the clamp is at the engine end.

Also, it shouldn't be too tight - ideally the return spring should throttle the engine back to idle if the control cable somehow let go.
10-29-2013 04:10 PM
rikhall
Re: Yanmar 2GMF, throttle return spring too strong

A common problem, a very cheap fix:



This was on my brand new Yanmar 2GM20F.

Just tighten until is stays where you want it when you adjust it.

Rik
10-29-2013 02:40 PM
Faster
Re: Yanmar 2GMF, throttle return spring too strong

Quote:
Originally Posted by wduncan50 View Post
I had the same problem on my hunter and had to buy a boat trottle cable brake. It's cheap and simple.

Teleflex Cable Brake - Star Marine Depot
You can make your own with a split piece of small hose.. firmly clamp it on the outer sheath with a hose clamp, and lightly clamp the other end on the sliding part of the cable.. adjust the latter tension for the friction you need.

You can do this at either end, whichever is most accessible.
10-29-2013 02:23 PM
wduncan50
Re: Yanmar 2GMF, throttle return spring too strong

I had the same problem on my hunter and had to buy a boat trottle cable brake. It's cheap and simple.

Teleflex Cable Brake - Star Marine Depot
10-29-2013 12:57 PM
capttb
Re: Yanmar 2GMF, throttle return spring too strong

The following is from the FAQ page from Edson:
Quote:
Q4: My throttle doesn't hold when I push it full forward - what can I do?
A4: Some Engine have a very tight spring on the throttle lever. Depending on the Engine Control Model, you may be able to tighten the Throttle Friction Adjuster. Older controls may not have this adjuster, but a "horseshoe" cable-clamp can easily and inexpensively be clamped around the outer jacket of the engine control cable to add the proper cable resistance
10-29-2013 11:53 AM
redline
Re: Yanmar 2GMF, throttle return spring too strong

On my C&C33 I looked and never found a throttle friction adjustment on the Edson pedestal. What I did find (with help from the person who sold the boat new) was a small u-bolt on the cable which needed a tiny bit of tightening. Always found it odd, but it worked, even though the "adjustment" was a bit touchy.
10-24-2013 07:11 PM
arf145
Re: Yanmar 2GMF, throttle return spring too strong

capttb has it right. I had that problem with my Pearson. Assuming you've got an Edson pedestal, the screw is inside where the speed control comes through. Tighten that set screw a tiny bit --it doesn't take much.
10-24-2013 05:43 PM
rauschpfeife
Re: Yanmar 2GMF, throttle return spring too strong

I looked but didn't see one; will look again. It kinda appears that spring tension
is needed from another source to balance the idle-ward internal tension in the fuel system itself.
10-24-2013 05:37 PM
capttb On an Edson pedestal there is a bolt to adjust the tension on the throttle lever under the compass.
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