Can't free throttle

[AST]

Hi,
On my sailboat, I have a 3ym30 yanmar (2013). Everything works except I can't pull the nob on the throttle to lock the throttle in neutral position (to rev the engine in neutral). Foreward and reverse works with no problem.

Any idea how to troubleshoot this?
THanks

[maine50]

Can you post a picture? On the vetus type with a small push pin for neutral, it's has a rubber pencil eraser covering that breaks down and can jam in or out. It took a pair of tweezers to pull the disintegrated mess out of or off the pin that's suppose to go in to make go into neutral.

[StuM]

Originally Posted by AST

Hi,
On my sailboat, I have a 3ym30 yanmar (2013). Everything works except I can't pull the nob on the throttle to lock the throttle in neutral position (to rev the engine in neutral). Foreward and reverse works with no problem.

Any idea how to troubleshoot this?
THanks

Photo of your specific throttle and knob?

[Sailmonkey]

Ummmmm......corrosion?

Beat into submission with Lube or replace.

[AST]

I am away from the boat. But I will be going there soon and will update the post with a picture.
Thanks to all

[sailormed]

You can rev the engine in neutral directly on the engine.

[AST]

Attached photos. I am wondering if I should start by removing the screws (red arrows).

Thanks

[barnakiel]

The knob may be stuck with old grease and grime.


Open up the kit, clean it, put it back together. Works now?


Eh ;-)


A temporary measure is spraying the knob with plenty of WD 40 so that the liquid gets well inside the knob/housing gap. Work the knob. This may dissolve some of the grime.



barnakiel

[AST]

I unscrewed the screws on the outside knob but the knob wouldn't come out.
when you say "Open up the kit, clean it". Are you talking about the screws in red (in the picture)?

Thanks

[jimbunyard]

Sure you don't push it in instead of pull it out? On many, if not most, sterndrives and outboards with single-lever controls, that's how they operate.

If not, see if you can get the little flat head screw at the base of the lever out, and see if that lets you unscrew the lever. Once you get the lever out, that should let you remove the exterior bezel and perhaps either free up the knob or give you acess to remove the complete control and clean it up off the bulkhead.

[a64pilot]

What kind of boat is that? It looks awful familiar

[barnakiel]

Yep. True.


Typical Volvo / Tfx is push in.
Typical Perkins is pull out.


b.

[AST]

It is IP 29
Sorry for the delayed response

[nuku34]

The shift/throttle lever typically does NOT screw onto its shaft. The shaft has longitudinal ridges that engage similar ridges in the shift lever. This is the lever can be positioned at various angles relative to the shift mechanism when you mount it.

Typically the lever is held on the shaft by a set screw. Also typically, people don't maintain the thing and don't put the set screw in with anti-corrosion grease. So typically, the set screw (usually stainless) gets corroded into the handle (usually alloy). The only fix is to drill out the set screw, pull the handle off its shaft (hopefully it won't also be corroded to the shaft). When you put the unit back together, you'll have to tap the new bigger hole in the handle and put in a larger set screw (I don't use a set screw for this job; I prefer a hex head bolt with the head standing proud of the handle. Not as "pretty", but sure a lot easier to get loose!).

Re the sticky neutral knob: typically it is also a matter of corrosion between the knob (often its alloy) and the hollow shaft (usually its stainless). Once you get the shift handle off, you can unbolt the unit (the red screws), take off the shift and throttle cables, disassemble the unit, clean out any corrosion, fill it with grease, and put it back on. Sh-t happens and things wear out (faster if they are not periodically maintained). You are lucky the shift mechanism didn't sick in forward or reverse when trying to dock the boat. This can happen if the internals of the shift mechanism don't get greased and corrosion sets in.

[AST]

Thanks for the tips.
Based on pictures, any one has a guess on the brand name of this control (in case I want to replace it)?
thanks