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Go Back   SailNet Community > General Interest Forums > Gear & Maintenance > Engines > Diesel
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Diesel This is a new forum dedicated to diesel engines and their applicable accessories.


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Old 04-18-2013
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Unhappy Restart is hard after the winter

Hello,

I have a Kubota 3 cyl 21 hp.
The filters and oil are all changed as it should be.

The problem is that I can't start the engine.
It turns over nicely, but the glowplugs don't stay on long enough.

When I measure the voltage on the glowplugs, it reads 10 or 11 volt and dropping slowly. The relais shuts off, before i release the glowplug switch.

The starting battery reads 12,7 volt at rest and 10 volts when glowing or cranking.
This starting battery is charged by a good 4-stage charger from shorepower.

Do I need new battery or new relais or is it someting else?
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Old 04-18-2013
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Re: Restart is hard after the winter

Hey,

If your starting battery is at 10 volts when USED (glow plugs and / or cranking the engine) either it is discharged or just dead. If it reads 12.7 at rest I think the battery is just shot. Do you know how old it is?

Can you 'borrow' a known good battery and use that as a test?

Good luck,
Barry
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Old 04-18-2013
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Re: Restart is hard after the winter

Also, do they have wd40 in Belgium?
You can use wd40 as a starting fluid with diesel engines.
Squirt some on the air intake before cranking.
Ether is not recommended for starting diesels.
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Old 04-18-2013
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Re: Restart is hard after the winter

Quote:
Originally Posted by bartvdv View Post
Hello,

I have a Kubota 3 cyl 21 hp.
The filters and oil are all changed as it should be.

The problem is that I can't start the engine.
It turns over nicely, but the glowplugs don't stay on long enough.

When I measure the voltage on the glowplugs, it reads 10 or 11 volt and dropping slowly. The relais shuts off, before i release the glowplug switch.

The starting battery reads 12,7 volt at rest and 10 volts when glowing or cranking.
This starting battery is charged by a good 4-stage charger from shorepower.

Do I need new battery or new relais or is it someting else?
Just had the same problem .
Lucky for me the engine has not yet been fitted .
But it turned out to be the fuel cutoff solenoid.
Seems if it is not working the power can not pull back a small pin.
Hence the pin stays out and stops the fuel starting the engine..
It was Not easy to find that out I can tell you...
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Old 04-19-2013
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Re: Restart is hard after the winter

I do have WD40, 'i'll give it a shot'.
Today i will try to find a known good battery (or buy one).
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Old 04-19-2013
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Re: Restart is hard after the winter

Quote:
Originally Posted by macwester26 View Post
But it turned out to be the fuel cutoff solenoid.
I think macwester is on the mark here. If you have a fuel cutoff valve (many small diesels do but many don't...I'm not familiar with Kubota) and the voltage drops too low the fuel cutoff solenoid will not stay open to allow fuel to flow.

If the voltage starts at 12.7V with no load your battery it needs an equalizing charge at a minimum. If after equalizing the battery the open circuit voltage is still less than 13V or if the voltage is higher but falls rapidly when the glow plug circuit is energized you need a new battery.

Good luck.
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Re: Restart is hard after the winter

Hey,

I have a 3 cyl Universal Diesel on my boat, which is based on a Kubota tractor engine. The engine stop lever is mechanical, there is no solenoid involved.
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Old 04-19-2013
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Re: Restart is hard after the winter

12.7 volts at rest, 24 hours since the last charging, would be a 100% perfectly good "12" volt battery.

"It turns over nicely" seems to confirm this.
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Old 04-20-2013
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Re: Restart is hard after the winter

Did you change the fuel filters? If you did and got air in and didn't bleed the system, it won't start.
MarkSF likes this.
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Old 04-24-2013
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Re: Restart is hard after the winter

Fuel is clear of air, seems OK.
i tried my house battery to start the engine, but the effect was the same: the reading voltage on glowplugs is only 10,5 V (maybe the house battery is also shot...)
I also bridged the glow plug relais manually, but the effect was the same.
I tried also the WD40, to no avail.

I ordered a new battery to sum things up :-)
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