yanmar 4JH4-HTE dificult to start

Ralph Johnstone · Jan 25, 2023

miguelgdelrey said:
Does somebody knows where the solenoid that cuts the fuel to the yanmar is located?

That is not your problem. If it was, the engine would never start, much less run.

Do a search here for "hard to start" using "Find exact phrase" and check the usual culprits, low battery voltage, high voltage drop, etc, etc, etc,

smokey73 · Jan 25, 2023

Yanmar M200 in a Hunter 49? 887.8 HP should move you along nicely unless you sink from the weight?

When you say it does not start, do you mean it turns over but will not start or that when you turn the key or push the start button that it does not even turn over?

Ralph Johnstone · Jan 25, 2023

miguelgdelrey said:
So maybe the solenoid valve can be stuck…

The Yanmar M200, beside being 888 HP, is also a miracle as it runs on no fuel if the solenoid is stuck and yet :

miguelgdelrey said:
and after de engine starts it work perfectly at all RPMs

Yes, truly a miracle engine.

SycloneDriver · Jan 25, 2023

What is de M200?

I'm guessing that you are operating in a warm climate, and we won't need to discuss glow plugs. ?

smokey73 · Jan 25, 2023

The Yanmar M200 is an 887.8 Horse Power commercial diesel engine.

YANMAR M200-EN 887.8HP

Model:M200-EN Brand:Yanmar Certainly! Feel free to contact the nearest Yanmar dealer or distributor for more detailed and…

www.maritimepropulsion.com

Really need more details from the OP on what is meant by "not starting"

SycloneDriver · Jan 25, 2023

smokey73 said:
The Yanmar M200 is an 887.8 Horse Power commercial diesel engine.

YANMAR M200-EN 887.8HP

Model:M200-EN Brand:Yanmar Certainly! Feel free to contact the nearest Yanmar dealer or distributor for more detailed and…

www.maritimepropulsion.com

Really need more details from the OP on what is meant by "not starting"

I don't really think the OP has "that" M-200 in his boat.

smokey73 · Jan 25, 2023

miguelgdelrey said:
......
Also from where does the M200 takes its power? is there a breaker or fuse?
........
Sometime ago I did not have to turn on the radar-autopilot for the M-200 to turn on, so I Think now is taking the power from de Autopilot, but before it did not need for them to be on, just with the key switch it would turn on.

OP originally referenced the M200 in the initial post. Just going from that. All that aside, "not starting" is way to an oblique statement to provide any meaningful discussion. We need specific symptoms to provide any meaningful assistance.

smokey73 · Jan 25, 2023

miguelgdelrey said:
..... and after de engine starts it work perfectly at all RPMs but after I turn it off is veri difficult to start again.

This may be the "key" to the whole problem. From this sentence it seems the OP may be suffering from the all too common problem of poor connections and/or small conducters in the starting circuit and/or poor ground connections. If the probem occurs only after the yanmar has been run, the heat can cause already "poor connections" to increase resistance in the circuit and prevent the starter solenoid from receiving enough current to engage the starter. There are many threads that discuss this problem and potential solutions. For @miguelgdelrey does the problem generally occur after you have run the engine and then shut it off and tried to restart.

Ralph Johnstone · Jan 25, 2023

miguelgdelrey said:
Sometime ago I did not have to turn on the radar-autopilot for the M-200 to turn on, so I Think now is taking the power from de Autopilot, but before it did not need for them to be on, just with the key switch it would turn on.

If you read reeeeeeeeeeeeeally closely, perhaps the OP has solved his own problem. Look at the first "on" which I have coloured in red. The OP intended to say "off" but confuses the words "on" and "off". He had to turn the radar-autopilot OFF to supply enough power to the starter to get the M-200 (for lack of the engine name) going fast enough to start. This is the result of either :

1. The battery voltage is down. Take your pick between either poor charging or a failed battery.

2. A high voltage drop due to high resistance in the wiring to the starter.

smokey73 said:
Really need more details from the OP on what is meant by "not starting"

miguelgdelrey said:
but after I turn it off is veri difficult to start again.

He says the engine is "veri difficult to start". It's turning over but is "veri difficult to start".

@miguelgdelrey , you seem determined that the engine stop solenoid is the cause of your difficult starting. The only way to prove this is to install a new solenoid. So go ahead and try that and :

- if that doesn't work, come back and we'll look at replacing your batteries

- and if that doesn't work, come back we'll look at replacing your wiring to the engine starter

- and if that doesn't work, come back and we'll look at replacing your starter motor.

- and if that doesn't work, come back and we'll find something equally useless to replace seeing as how it's your money.

All pretty dumb ideas of course, but the point I'm making here is that you test and "prove or disprove" each idea before jumping in and replacing parts without any proof they are broken.

artboas · Jan 25, 2023

miguelgdelrey said:
Hello everyone. Does somebody knows where the solenoid that cuts the fuel to the yanmar is located?
Also from where does the M200 takes its power? is there a breaker or fuse?
I am trying to find out what is happening since I dont see any leaks in the fuel line, and after de engine starts it work perfectly at all RPMs but after I turn it off is veri difficult to start again.
Sometime ago I did not have to turn on the radar-autopilot for the M-200 to turn on, so I Think now is taking the power from de Autopilot, but before it did not need for them to be on, just with the key switch it would turn on.

artboas · Jan 25, 2023

Ok,
Here’s what nobody has picked up on..
If the stop solenoid was continually powered, the boat would have burned up awhile ago.
Engjne stop solenoids take a ton of power, and they work against a stong spring.
I’ve known of 2 disastrous boat fires caused by the control line to the solenoid being continually on.
This can happen (but very infrequently) in 2 ways.
a corroroded push button that stays stuck when you pus it

or,some panels have “ekectronic off”, which just monetarily. Activates the solenoid when you turn tj key off.

s0, that’s that mystery explained

Ralph Johnstone · Jan 25, 2023

...........

artboas said:
s0, that’s that mystery explained

Maybe for you but I'm Illinois.

Two years ago I was going to install a Trombetta P/Q610 Series solenoid but decided it wasn't worth the cost for just an extra toy. If all engine shut down solenoids work the same, the solenoid requires a large pull in current of 48A and then immediately goes to a holding current of 1A as shown in the manual :

The solenoid requires power to allow the fuel rack to open.

artboas said:
If the stop solenoid was continually powered, the boat would have burned up awhile ago.

If the solenoid had stayed in the "pull current" position they would have burned out but they always require power for the engine to run. When you punch the STOP button, power is disconnected from the solenoid and the fuel rack returns to the no fuel position. Engine stops.

artboas said:
This can happen (but very infrequently) in 2 ways.
a corroroded push button that stays stuck when you pus it

In this case, the engine would never start. This is starting to lean towards the OP's problem but his engine does eventually start after a long cranking session and then goes at any and all speeds. I don't think this applies to the OP's question.

Davidasailor26 · Jan 26, 2023

smokey73 said:
This may be the "key" to the whole problem. From this sentence it seems the OP may be suffering from the all too common problem of poor connections and/or small conducters in the starting circuit and/or poor ground connections. If the probem occurs only after the yanmar has been run, the heat can cause already "poor connections" to increase resistance in the circuit and prevent the starter solenoid from receiving enough current to engage the starter. There are many threads that discuss this problem and potential solutions. For @miguelgdelrey does the problem generally occur after you have run the engine and then shut it off and tried to restart.

This is my guess too. But to troubleshoot more it would help to know exactly what the symptoms are when the engine doesn’t start. Does it just click, or struggle to turn slowly (poor connections to the starter), or does it turn at the normal starter speed and just never kicks (no fuel)?

SycloneDriver · Jan 26, 2023

Ralph Johnstone said:
...........

The solenoid requires power to allow the fuel rack to open.

If the solenoid had stayed in the "pull current" position they would have burned out but they always require power for the engine to run. When you punch the STOP button, power is disconnected from the solenoid and the fuel rack returns to the no fuel position. Engine stops.

In this case, the engine would never start. This is starting to lean towards the OP's problem but his engine does eventually start after a long cranking session and then goes at any and all speeds. I don't think this applies to the OP's question.

Not all diesels operate that way. The generators that I work on do require power to the fuel "run" solenoid to operate. My Yanmar 3YM20 requires power to the "stop" solenoid to stop the engine.

smokey73 · Jan 26, 2023

Davidasailor26 said:
This is my guess too. But to troubleshoot more it would help to know exactly what the symptoms are when the engine doesn’t start. Does it just click, or struggle to turn slowly (poor connections to the starter), or does it turn at the normal starter speed and just never kicks (no fuel)?

Bingo! We need more info about what are exactly the symptoms. We have all made assumptions, some of which are confusing. On vs Off on the Auto-pilot switch, it cranks and cranks and then starts (I didn't see that in the OP's post or single response to date). etc. @Ralph Johnstone is correct that throwing parts at the problem is not the solution. It leans towards a battery problem or a curcuit resistance problem. The OP may be back to post some of those detailed symptoms so we can all stop assuming things and help.

yanmar 4JH4-HTE dificult to start

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