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Old 06-02-2019, 03:51 PM   #1
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Yanmar 6LYA STP won't start

We have a 2002 Mainship 390 with a Yanmar 6LYA STP engine, engine would not start, was in neutral, Played with the shifter, and then starter engaged, and Started fine, Shut off and started right back up, is this a starter issue or another issue, Many thanks for any help
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Old 06-02-2019, 04:56 PM   #2
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Probably just the neutral start. Close, but not quite in neutral.
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Old 06-02-2019, 04:57 PM   #3
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Check the neutral start switch- if it’s sticky, it will exhibit the signs you experienced.
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Old 06-02-2019, 08:33 PM   #4
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Been there done that with my 6LP-STE, no start, no nothing.
I knew it was not the neutral switch because I installed a new throttle/shifter and ignored the neutral-safety hook up, Besides, I always shut down and start in neutral, duh..

After hours and hours troubleshooting and replacing start relay etc, somebody suggested I move the throttle/shifter and she started right up...
(The tranny has a separate idiot switch, independent of the throttle.)
Had to eat humble pie that day..
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Old 06-03-2019, 07:27 AM   #5
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Quote:
Originally Posted by Pau Hana View Post
Check the neutral start switch- if itís sticky, it will exhibit the signs you experienced.
Where is this and what am I looking for Many thanks
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Old 06-03-2019, 07:52 AM   #6
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Where is this and what am I looking for Many thanks
Not sure where, but look at the transmission, you should see 2 wires.
I will look at mine today and let you know.
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Old 06-03-2019, 08:15 AM   #7
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Not sure where, but look at the transmission, you should see 2 wires.
I will look at mine today and let you know.


I can't recall any shift switch on my Yanmar 6LY with a ZF 220 transmission. So I think it is part of the throttle/shift lever mechanism.


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Old 06-03-2019, 10:31 AM   #8
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I will check the throttle shift leaers
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Old 06-03-2019, 01:36 PM   #9
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I have Identified it is the switch in both helm controls not sure wether it is the switch or the lobe on the shift lever depressing the switch does anyone know where I can find either
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Old 06-03-2019, 01:44 PM   #10
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Can I lend you my wrenches?


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Old 06-03-2019, 01:45 PM   #11
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Why is it really hard to take apart
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Old 06-03-2019, 05:12 PM   #12
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Quote:
. I can't recall any shift switch on my Yanmar 6LY with a ZF 220 transmission. So I think it is part of the throttle/shift lever mechanism.
I got the ZF tranny and pretty sure there is a switch down there, if not, then on the fuel control unit: Canít start out of idle, or out of neutral.
I replaced the dual throttle/shifter with the 2 levers a year ago with a single lever
Teleflex/Morse unit. No electric wires going up there but instructions and connectors for hooking it up, figured I was not protected..Wrong.

Turns out there is a Yanmar or ZF switch somewhere down in the engine room providing the same protection.
Did not have a chance to look today, but will do tomorrow.
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Old 06-03-2019, 07:00 PM   #13
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Many thanks
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Old 06-08-2019, 07:57 PM   #14
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Sorry I am late responding.
Yes, there is 2 wires going straight to the transmission on my boat.
Did not shoot a picture, but a quick look on your part should find the same.
I assume the wires are for the neutral switch, otherwise an over temp sensor, not sure.
Been busy working on boat stuff between rain showers, friends in town, wife and dog, forgot this thread and my promise to show and tell.
If you don’t see the wires on your tranny, let me know and picture is coming.
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Old 06-10-2019, 03:26 PM   #15
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Many thanks no all is good, it was the neutral switch in the shifter controls had worn, I replaced the whole lower unit and moved it to the flybridge, and she starts flawlesley from both helms.
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