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Old 04-09-2019, 19:55   #1
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Engine shuts down when put in forward or reverse

I have a yanmar 4BY-180 engine on my R27 Ranger Tug. The engine starts and runs in neutral. When I shift to forward or reverse the engine stops.
Any ideas as to what would cause this?
The prop turns freely
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Old 04-09-2019, 20:36   #2
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Re: Engine shuts down when put in forward or reverse

Your prop is fouled, some one leave a mooring line in the water.
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Old 04-09-2019, 22:01   #3
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Re: Engine shuts down when put in forward or reverse

Is the engine idle speed too low?
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Old 05-09-2019, 02:40   #4
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Re: Engine shuts down when put in forward or reverse

The boat is on the trailer so I can see the prop is not fouled, and the engine rpm is the same as itís always been. Thanks for the replies
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Old 05-09-2019, 02:54   #5
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Re: Engine shuts down when put in forward or reverse

gearbox !
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Old 05-09-2019, 08:17   #6
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Re: Engine shuts down when put in forward or reverse

Does it have a neutral safety switch to prevent starting when in gear? If so temporarily disconnect it and see what happens.
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Old 05-09-2019, 08:29   #7
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Re: Engine shuts down when put in forward or reverse

With the engine off and in neutral, can you spin the prop by hand?
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Old 05-09-2019, 08:47   #8
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Re: Engine shuts down when put in forward or reverse

Which gearbox and is it manual shift or electric shift?


Can you put it in gear with the engine OFF, key on if electric and turn the shaft in either forward or reverse?



You could try disconnecting the engine cut off solenoid and see if that solves the problem.
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Old 05-09-2019, 14:27   #9
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Re: Engine shuts down when put in forward or reverse

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Originally Posted by Squanderbucks View Post
Does it have a neutral safety switch to prevent starting when in gear? If so temporarily disconnect it and see what happens.
Thanks for the suggestion. It does have a neutral safety switch. Iíll try that next.
I did disconnect the throttle cable and shifted into gear by hand and it still stopped.
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Old 05-09-2019, 15:16   #10
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Re: Engine shuts down when put in forward or reverse

Test the fuel pump/injector pump? - Perhaps pump can't keep up with the extra fuel demands when in gear.
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Old 05-09-2019, 16:55   #11
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Re: Engine shuts down when put in forward or reverse

If disconnecting the safety switch does not resolve the issue, check the drive shaft for rotation while manually turning over the engine while in gear using a socket on the engine crankshaft pulley with the use of a two foot breaker bar on the end of the socket for leverage. It should turn over easily. If not, the transmission is the problem.
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Old 05-09-2019, 21:41   #12
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Re: Engine shuts down when put in forward or reverse

What do you mean by it shuts down
Can you see the shutoff solenoid moving
Or does it labour and slow down and then stall
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Old 06-09-2019, 01:24   #13
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Re: Engine shuts down when put in forward or reverse

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Originally Posted by OleksiakT View Post
Thanks for the suggestion. It does have a neutral safety switch. Iíll try that next.

I did disconnect the throttle cable and shifted into gear by hand and it still stopped.


Because your engine has common rail injection controlled by a CPU that has various safety modes of operation including shutdown for what the CPU regards as a criticality (like zero oil pressure) and limp mode for a lesser problem such as coolant flow, higher exh temp maybe, low alternator output...... the list is long and if any one of the electronic sensors that provides the CPU with info fails, the result is possibly what is happening with your engine..... hopefully it's just the neutral switch as wisely suggested by a previous post.
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Old 06-09-2019, 08:38   #14
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Re: Engine shuts down when put in forward or reverse

have you recently repacked the stuffing box and over tightened it ?
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Old 14-09-2019, 13:43   #15
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Re: Engine shuts down when put in forward or reverse

The neutral switch only prevents start up in gear !
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