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Old 09-07-2015, 17:50   #16
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Re: Yanmar 3GM30 Starting issues - Starter? Solenoid? Wiring?

Put (old) screw driver from power wire on starter to tickle switch post on solenoid. If it works a few times then you have a wiring fault.
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Old 09-07-2015, 18:27   #17
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Re: Yanmar 3GM30 Starting issues - Starter? Solenoid? Wiring?

HI: If you tap the starter a few good raps and you're lucky enough to get it to turn then it's a sure fire indicator that the bushings in the starter are worn out. They are iolite bushings at both ends of the armature and when they wear they allow the armature to short to the fields by touching them. When you hit the starter while the solenoid is engaged you knock the armature off the field and it begins to spin, once spinning the magnetic fields and the centrifugal force hold it centered and it works fine until you stop it. When cold the bushings are contracted enough to keep the armature off the fields.
Remove the starter and have it rebuilt.
Hope this helps clarify.
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Old 09-07-2015, 22:27   #18
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Re: Yanmar 3GM30 Starting issues - Starter? Solenoid? Wiring?

I would guess that it is the starter, but two things to check and here they are:

Run a hot wire from the battery to the push button switch with fairly heavy wire. 12 or 10 gauge. There is a fuse in the harness of these engines and sometimes there is a voltage drop because of corrosion. If it starts easily hot you have a corrosion problem in the hot to the panel.

Clean all the connections at the starter and the ground to the engine.

Probably the starter. I had the same issue.
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Old 09-07-2015, 22:33   #19
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Re: Yanmar 3GM30 Starting issues - Starter? Solenoid? Wiring?

Two years ago, my 3gm had a start issue when recommissioning. When the start switch was pushed the solenoid clicked, but wouldn't turn starter over. Pulled starter and discovered bendix shaft was corroded to gear. Pulled everything apart, used some scotch brite to clean shaft and all has been well since.
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Old 10-07-2015, 09:24   #20
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Re: Yanmar 3GM30 Starting issues - Starter? Solenoid? Wiring?

Quote:
Originally Posted by MikePz View Post
Try this it worked for me on 3 different Yanmar engines! The problem is the voltage loss in the starter solenoid circuit (wiring between the instrument panel and engine).

Yanmar solved the problem with the installation of a small starter relay in the circuit on newer engines. Addition of a homemade starter relay is very easy - let me know if you would like a diagram.

Mike Pz
Yep, this is a common problem. The start wires in wiring harnesses that connect the standard Yanmar instrument panel to the engine wiring harness are too small, making the voltage drop to the solenoid too high for reliable starting.

Yammer offered an "optional" starter relay to solve this problem. You can go to any auto parts store and get a starter relay instead of getting the Yanmar version (its hard to find, anyway. the part number isn't in their part book).

Hook the start wire from the start switch to the pull down terminal on the relay. Connect the other pull down terminal to ground. Connect one of the switched terminals to the battery by building a cable that connects the main battery cable at the starter to the relay. Connect the other switched terminal to the starter solenoid, and you're done.

Scott
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Old 10-07-2015, 21:03   #21
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Re: Yanmar 3GM30 Starting issues - Starter? Solenoid? Wiring?

not turning when hot could be the bendix or internal wear in the starter. shimming may help but if the starter hasn't been replaced pryer to the problem it's not likely. could even be a main ground cable run under the engine or near some hot section of the engine that needs replacing, as an old wire has reduced conductivity and when hot even less. check your batt cables, if they've lost their luster replace them. if the problem isn't solved replace the starter. As mentioned above, I'd choose the time of replacement rather than in some isolated location.
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Old 11-07-2015, 04:46   #22
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Re: Yanmar 3GM30 Starting issues - Starter? Solenoid? Wiring?

A new starter is very cheap in US.
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Old 13-07-2015, 19:49   #23
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Re: Yanmar 3GM30 Starting issues - Starter? Solenoid? Wiring?

Measure the voltage at the solenoid when holding the starter button/key. Less than 8V and the solenoid won't pull in far enough to power the starter.

I had very intermittent no-start issues solved by cleaning up all the connections in the harness and control panel, but the final solution was to install an automotive cube relay right at the solenoid, activated by the key switch. Zero problems since then.
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