Hunter 466 Engine crank no start

[Dennis55]

Engine started perfectly last week Hunter 466 2004.
Tried to start today and it turns perfectly, but would not start.
Full of diesel, generator starts no problem.
Yanmar 4JH2-HTE 76HP
Any ideas?
Thanks
Dennis

 

[Rick D]

Engine started perfectly last week Hunter 466 2004.
Tried to start today and it turns perfectly, but would not start.
Full of diesel, generator starts no problem.
Yanmar 4JH2-HTE 76HP
Any ideas?
Thanks
Dennis

I had exactly the same thing happen on my 40.5. Turned out it was the engine shut off not all the way off. I think yours has a solenoid shut off. I'd start by checking that. Good luck!

 

[Dennis55]

You mean that red button that's shuts the engine down?
What does it actually shut off fuel or ignition?
And where is it?
Thanks
Dennis

 

[Rick D]

You mean that red button that's shuts the engine down?
What does it actually shut off fuel or ignition?
And where is it?
Thanks
Dennis

I'm firing in the dark here...I never had a solenoid-controlled engine shut off, so I don't know. Basically, it is the electronic equivalent of a manual fuel shut off. It shuts off the fuel supply. I suspect...without authority...that the fail-safe position is "fuel supply off". Someone else will give you better specific information for this application. Sounds maddeningly simple.

 

[Dennis55]

Thanks Rick, I will look in the manuals.

 

[NYSail]

Start simple..... shut off switch or fuel switch

 

[Dennis55]

What shut off switch?
Generator running no problem, so doesn't look like fuel issue...

 

[arf145]

You mean that red button that's shuts the engine down?
What does it actually shut off fuel or ignition?

With a diesel there's no such thing as shutting off the ignition, as ignition happens because of compression, not a spark. So the engine shutoff will control the fuel.

 

[Dennis55]

Didn't think of that, you right!

 

[Dennis55]

Where's fuel shut off to the engine than?

 

[Don Crowther]

Sorry I don't know your boat. But if the engine turns over but won't start then I would say it's not getting fuel. There could be a number of reasons.
You could crack open the fuel line at the injector and see if you are getting fuel when you crank it over.
If you've not getting fuel there then you have to start looking back towards the fuel tank.
Is the fuel shut off switch or pull cable working as designed?
Maybe a small air leak in the system.
Just some thoughts.
good luck

 

[Dennis55]

Thank you, I will check.

 

[Dennis55]

Just a thought, it has engine shut off button on control panel that I assume controls fuel shut off solenoid.
Could solenoid get stuck in shut off position or it spring loaded to open?

 

[Head Sail]

Just a thought, it has engine shut off button on control panel that I assume controls fuel shut off solenoid.
Could solenoid get stuck in shut off position or it spring loaded to open?

Anything is possible. You need to check or hire someone. Did you pre-heat the glow plugs?

 

[Dennis55]

Oh yeah

 

[Ken Cross]

Glow plug engines can be hard to start if the glow plugs fail. More likely it is a fuel issue however.
Have you recently replaced the fuel filter (then it needs to be bled.)
Because you have multiple cylinders you can possibly rule out an injector issue.
A leaky filter or water separator would do it (fix it then bleed the system.)
As previously mentioned a shut-off system issue or is the decompression system activated.

Ken

 

[Dennis55]

Thank you for your reply.
Where can read on bleeding and decompression on 4JH2-HTE?

 

[Bill Roosa]

Couple of things for the non-diesel literate. The fuel shut off is the only electrical item on the injection pump. while a helper activates the stop switch observe the motion of the solenoid. it stops the fuel when pressed so when released it should return to "full on" press on the solenoid to make sure it is returning (return spring busted or something sticking???) to the "full on" position.
If it was a cool day and the first start of the day (cold start not warm start) you may have to crank for some time to get enough heat to light the fires or use the glow plugs/ intake air heater (yanmar use both systems but never on the same engine.) to make a cold start a somewhat less than cold start. Check the exhaust for white unburned fuel vapors during and after failure to start cranking. The air heater has some specific start procedures that may be considered odd. It is easy to tell if you have an air heater ahead of the intake manifold. Look for substantial size wires going to a "box" between the air cleaner and the intake manifold proper. Glow plugs look like spark plugs but without the high voltage wires. The do have substantial low voltage wires (one per cylinder) and should feel warm to the touch after 15ish seconds of "on time". And if that where not enough, there are engines that have a "glow plug" setting on the ignition switch (dump name for a diesel engine BTW) that does not do anything. they don't have glow plugs or air heaters and you just have to crank a lot on cool day cold starts.
Good luck

 

[Dennis55]

Bill thanks a bunch for taking time writing this, I will be at the marina on Thursday to try.

 

[Dennis55]

Guys problem was in this little gauge. In "normal" position of the toggle switch I would get red "discharge" light with audible tone. Engine would not start.
In "Override" position of the toggle switch tone silences and engine starts right up.
What is this device do?
Dennis