dear Mr. newman, i see you are in all techical posts for ys.
i own multiple engines but thisbis my first dz engine, i just fired it up today and it started with 1 flip, really powerfull engine 18-8w apc 8350 rpm. Wow!
but i noticed a constant leaking of fuel at the head nipple, i see some green snot was applied around nipple that enters the head assembly.
is this serviceable?
can this be the source of the leak or just the black check valve? I opened it and it seems fine, clean and good diaphragm.
i hope tobhear your thoughts on this issue.
thanks
jesus castaneda
Originally Posted by
Troy Newman
Chances are the engine was flooded.
The DZ motors no longer use the pressure regulator system. As a result if you put a "T" in the tank pickup line to fill the tank it can pump fuel through the engines pump and flood it. This can make the engine spit a little drip a bunch and not start.
The key on that is to somehow pitch the fuel line to the pump on the engine side of the "T" fitting this will keep the fuel from pushing into and past the pump on the engine. I run my fuel lines outside the model. Close the line to the tank with a plug when filled. Then I connect the line to a fuel filter than leads to the pump on the engine right before I start it. This eliminates the issue.
All of the YS engines with the Pressure system don't have this issue...only the DZ or Dingo motors. The same problem would occur with an OS 46 if you filled it the same way.
Another option to cause the flooding is filling the tank and then sitting the model in the sun. The tank will heat up and expand a little causing fuel to siphon into the engine flood it. So I keep the like pinched or disconnected until its time to start.
Troy Newman
Team YS Performance