Nissan 5hp 4stroke Ignition

[rythmman]

Does anyone know the VOLTAGE of the following:
1) Output from exciter coil - I have 16vac
2) Input to coil from CD - I have 15vdc

There is no spark at plug, so I'm thinking the coil is broken.

Thanks

 

[pvanv]

Re: Nissan 5hp 4stroke Ignition

The Factory service manual, available at any dealer, uses ohm meter readings (not volt meter readings) to check ignition components.

 

[rythmman]

Re: Nissan 5hp 4stroke Ignition

I know, but I wanted the volt readings to check this when I crank the engine, as my spark is very small or none.

 

[rythmman]

Re: Nissan 5hp 4stroke Ignition

I have 6500ohms at the ignition coil...the manual says 4400ohms....does this mean mine is on the way out? Do ignition parts generally work or not; or can they slowly deteriorate?

 

[pvanv]

Re: Nissan 5hp 4stroke Ignition

Coils will "drift" in value depending on ambient temperature. There's also a pretty wide tolerance to the values during manufacture, and accuracy of the test meter is always a factor. Yes, reactive components (coils and caps) can/will deteriorate over time, but we're talking 20 years of normal use. Your reading sounds like it's within tolerance.

 

[rythmman]

Re: Nissan 5hp 4stroke Ignition

Does anyone have voltage values while the engine is running?

Exciter coil - 220Vac
Ignition coil primary input - 15mVdc (seems very low to me)

Thanks

 

[pvanv]

Re: Nissan 5hp 4stroke Ignition

Are you using a DVA or a scope to take readings? The coil input isn't actually pure DC, but a pulse. See the discussion at http://forums.iboats.com/showthread.php?t=180482

 

[rythmman]

Re: Nissan 5hp 4stroke Ignition

Plain digital multimeter. What should the input voltage be from the CD unit to the coil? Yellow/black wire , if I remember correctly?

 

[TOHATSU GURU]

Re: Nissan 5hp 4stroke Ignition

You have to use an analog meter and you need a service manual for the values.

 

[pvanv]

Re: Nissan 5hp 4stroke Ignition

Yes, should be analog, and (ideally) should be equipped with a dva section -- unless you has access to an oscilloscope. Digital meters will be way too erratic, as they try to "lock" onto the signal.