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Old 11-10-2016, 07:36   #1
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Yanmar YSM8 Won't Start

Hello all,

I have a Yanmar YSM8 that won't start. It hasn't ran since just before I took ownership earlier this year in May. The reason it sat was the failed exhaust coupler. I've since replaced the whole assembly (elbow, coupler, mixer and hose). With a 1000 amp battery jumper connected, it clicks once, nothing more. A couple of times I held the start button down and it sounded like it was turning, but very slowly.

What else do I need to consider so that I can get her cranked?

Side note: the alarm signal sounds when electrical power is turned on even without the key in the switch.
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Old 11-10-2016, 07:57   #2
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Re: Yanmar YSM8 Won't Start

It has a decompression lever I believe?
If so decompress it and turn it over by hand to ensure the motor if free. Once you know its not locked up the next step is electrical connections, take them all loose one at a time and clean them with a wire brush and put a light coat of grease on them and reconnect them.
Once that is done if that doesn't fix it, jumper the solenoid directly, you know the screwdriver trick, if that doesn't work, I'd then pull the starter.
Often times the problem is with the ground wire and people forget to check the ground.
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Old 11-10-2016, 08:00   #3
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Re: Yanmar YSM8 Won't Start

Great leads...following up now.
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Old 14-10-2016, 12:59   #4
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Re: Yanmar YSM8 Won't Start

Tracking down a hand crank now. I did go the screw driver method at that moment...starter sounded like it spun a bit, but the engine did nothing at all. That was without the jumper connected so maybe amperage was an issue there.
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Old 14-10-2016, 13:04   #5
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Re: Yanmar YSM8 Won't Start

Measure the voltage from the starter positive lug to engine block both when the engine is just sitting and again when you try to crank it. If you have less than 10.5V when cranking you should look for a bad connection in the 12v supply cables. If the voltage is unchanged, you might need a new starter.

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Old 14-10-2016, 13:12   #6
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Re: Yanmar YSM8 Won't Start

Quote:
Originally Posted by boatbod View Post
Measure the voltage from the starter positive lug to engine block both when the engine is just sitting and again when you try to crank it. If you have less than 10.5V when cranking you should look for a bad connection in the 12v supply cables. If the voltage is unchanged, you might need a new starter.

Sent from my SM-P900 using Cruisers Sailing Forum mobile app
Thanks boatbod, that'll be at the top of the list next time out.
P.S. i sent the thanks not realizing it would not post here...still learning the forum.
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Old 14-10-2016, 13:16   #7
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Re: Yanmar YSM8 Won't Start

Lots of info here for starting a yanmar. Please read cautions.

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