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Old 03-12-2020, 05:53   #1
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Stop Engine solonoid

Having problems on a Yanmar 4HJ3E
stop engine circuit, it just stopped working
and we have ordered a new relay and solonoid.
Got me to thinking about rigging up a manual
pull cable to back up or replace the
switch/relay/solonoid system.
Has anyone done the same?
Pros? Cons?
and suggestions are most welcome
Cheers
Neil
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Old 03-12-2020, 06:00   #2
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Re: Stop Engine solonoid

What I have done is to paint the gizmo on the shaft white. Its pretty easy for me to get to the engine on that side and I can just manually turn the shaft to shut it down.

It have considered what you suggest, just not high enough on the do list.
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Old 03-12-2020, 06:10   #3
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Re: Stop Engine solonoid

Quote:
Originally Posted by Time2Go View Post
Having problems on a Yanmar 4HJ3E
stop engine circuit, it just stopped working
and we have ordered a new relay and solonoid.
Got me to thinking about rigging up a manual
pull cable to back up or replace the
switch/relay/solonoid system.
Has anyone done the same?
Pros? Cons?
and suggestions are most welcome
Cheers
Neil
You donít say which boat youíre working on. Your challenges will be routing the pull cable from the cockpit to the engine room and finding or fabricating something to clamp the cable jacket end to at the engine. If you can do those two things, it will not be a problem, the solenoid on a 4JHE pulls aft to stop the engine, same as the pull cable.

Frequently the problem is not the solenoid, but the wiring to the solenoid (thereís usually an in line fuse near the solenoid). The push button kill switch often goes bad as well.
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Old 03-12-2020, 06:13   #4
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Re: Stop Engine solonoid

I use two manual stops on my DD4-53 engine. It's really a matter of being able to route a pull cable without very sharp turns. At least in my case, it is made easier by needing only a "pull," not a "push" to act, with a spring return. That's a simpler wire and spiral case, rather than a full control cable, and can be cut to length. There are two knobs at the instrument panel; pull one for engine stop and pull the other for "emergency stop," which slams an flap over the air intake for a run away engine.

Here's an example:

https://www.zoro.com/buyers-products...UaAj4-EALw_wcB
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Old 03-12-2020, 10:46   #5
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Re: Stop Engine solonoid

Quote:
Originally Posted by jkishel View Post
You donít say which boat youíre working on. Your challenges will be routing the pull cable from the cockpit to the engine room and finding or fabricating something to clamp the cable jacket end to at the engine. If you can do those two things, it will not be a problem, the solenoid on a 4JHE pulls aft to stop the engine, same as the pull cable.

Frequently the problem is not the solenoid, but the wiring to the solenoid (thereís usually an in line fuse near the solenoid). The push button kill switch often goes bad as well.
Itís an Irwin 44 Center Cockpit
Agree, the challenge is in the mounting of brackets.
Also agree that the wiring is very suspect, previous owner
Really Really buggered the wiring .
I have loads of experience building giant scale
RC airplanes so am experienced with
pushrods, cable pull pull set ups , bellcranks and clevisis
Another boat job,
We most likely will fix the solenoid/relay/wiring
But would still like to install manual back up
Thanx
Neil
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Old 03-12-2020, 11:23   #6
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Re: Stop Engine solonoid

The Yanmar 3JH4E has a push button as an emergency shut down of the engine (nice new and clean, wish mine was like that, and easy access).
The big red button on the picture.
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Old 03-12-2020, 13:12   #7
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Re: Stop Engine solonoid

Quote:
Originally Posted by Time2Go View Post
Itís an Irwin 44 Center Cockpit

I have loads of experience building giant scale
RC airplanes so am experienced with

Neil
Then maybe this will give you some ideas
SERVO TESTER Circuit
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Old 03-12-2020, 15:14   #8
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Re: Stop Engine solonoid

Before stop solenoids, most injector pump engines were stopped either by holding the throttle in the fully off position or by a separate cable. No big deal.
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Old 03-12-2020, 15:18   #9
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Re: Stop Engine solonoid

Seems elaborate for a simple diesel

On my Yanmar, I just bring the throttle all the way back and that’s ICO.
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Old 03-12-2020, 16:42   #10
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Re: Stop Engine solonoid

Quote:
Originally Posted by Time2Go View Post
Having problems on a Yanmar 4HJ3E
stop engine circuit, it just stopped working
and we have ordered a new relay and solonoid.
Got me to thinking about rigging up a manual
pull cable to back up or replace the
switch/relay/solonoid system.
Has anyone done the same?
Pros? Cons?
and suggestions are most welcome
Cheers
Neil
Pro - you can always stop the engine
Con - you have to install it, which I bet is at least as much work as fixing the current stop system

12v relays are cheap. Get a new one and just rewire the whole thing as that will take same amount of time as fixbg the existing
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Old 03-12-2020, 18:33   #11
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Re: Stop Engine solonoid

Quote:
Originally Posted by SamH View Post
Then maybe this will give you some ideas
SERVO TESTER Circuit
Have used similar devices when building
to test throws , clearances and interferences
and pull pull set ups.
Marine environment would kill them in a heartbeat
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Old 03-12-2020, 19:58   #12
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Re: Stop Engine solonoid

I'm ignorant in the way that diesels work. Does the cutoff solenoid cut off the fuel or the air?
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Old 03-12-2020, 21:40   #13
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Re: Stop Engine solonoid

Yes we have done this on our 4JH2TE when our solenoid went out. Works great and I wouldn’t go back to an electrical stop
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Old 04-12-2020, 02:11   #14
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Re: Stop Engine solonoid

Quote:
Originally Posted by NPCampbell View Post
I'm ignorant in the way that diesels work. Does the cutoff solenoid cut off the fuel or the air?
It cuts the fuel off right at (or inside) the injection pump.
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Old 04-12-2020, 02:55   #15
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Re: Stop Engine solonoid

Sounds like you have plenty of food for thought on this one. However , my experience is that the shut off solenoid works like this, power retracts the rod inside the solenoid and allows the fuel rack to open so that the injector pump has access to fuel. When you remove power to the solenoid the internal spring forces the rod outward and pushes the fuel rack closed. If it were me, I would pull the solenoid and check to see if it works. Keep in mind you may have to supply a ground wire to its outside if you only have one wire going in.Most cases are that the engine will not start versus not shut off.
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