Navman Log Impellor Cleaning

[Neddie_Seagoon]

I have a Navman S100 log on the new boat. Using the handle on top of the transducer unit I can pull it up about 3cm, but If I want to pull it up further (pull it out completely) I have to unscrew the cap of the through-hull fitting. When I do this and pull further water starts gushing in /forums/images/graemlins/laugh.gif

Anyone got a Navman log and prepared to describe how they clean the paddlewheel - doesn't seem to address this in the manual I've got or on the Navman website - feel thick asking this question but there was too much water coming into the boat for me to mess around when I tried pulling it out completely - or am I supposed to quickly put a bung in the through-hull?

Ta,

Steve

 

[gwc2004]

On every through hull log I've ever had there has always been a cap or bung to stem the flow. It's always worrying but that's how it's done. there should be a stopper.

 

[hornblower]

Aboslutely right. The only way is to have your bung at the ready and just go for it - pull the transducer out shove the bung in (it shoull look like the transducer) and screw down with cap. you then have all the time in the world to clean the paddle wheel. Changing it back again will of course involve more ingress of water.

You have to be quick man.

 

[Neddie_Seagoon]

Thanks to both - no screwfit bung thingy, the transducer comes up through the screwfit cap, through a rubber seal, but as I said not all the way, so I would have to remove the cap and seal. Can I get away with sticking a regular softwood bung in place while I clean it?

 

[Poignard]

If there are two of you on board all you need to do is to put the palm of your hand over the opening while your helper cleans the impellor with a toothbrush.

 

[simonfraser]

a soft wooden bung might expand and then crack the fitting to the hull, too much excitement perhaps

 

[samwise]

You should have got a screw on cap with a rubber seal that is part of the installation kit. Aside from diving and cleaning up the impeller from the outside, the only way is to whip the whole thing out and swiftly cap it. A frightening amount of water comes up because the hole is quite big and the spout is high enough to splash water everywhere, so cover cushions etc and wear your oilies. The problem with the cap solution is that it is likely that you will be is such a hurry to stem the flow that you will cross thread it. In the panic that follows, you could damage the thread on the fitting.Take it calmly. In fact, the inflow is not all that much, it just spreads around a bit! Softwood plugs could do the job, but as pointed out, there is a risk that you could crack the tube. The old Navico log on our old boat had a dummy unit with a couple of O rings that worked very well. On the safety front, the cover cap for your Navman should be secured on a line to the transducer. I also have a softwood plug on a line in the same location. If the worst happens and the skin fitting fails, you don't want your potential lifesavers floating away! The same goes for all seacocks.

 

[michael_w]

Here's a quick and easy method, just takes a bit of confidence.

Pull your sea boots on.
Unscrew the impeller retaining ring.
Whip out the impeller and cover the hole with your foot.

Hey presto! Minimal water ingress into the boat and both hands free to evict the little wrigglers and their garden from the impeller. If it looks like a major job, fit the blanking plug.

You'll probably get a pint of water in the boat.