Restart is hard after the winter - Page 2 - SailNet Community
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post #11 of 17 Old 04-24-2013
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Re: Restart is hard after the winter

10V is a healthy voltage while cranking. It is not such a healthy voltage while just the glow plugs are on.

I have a 3 cyl Kubota, and I can tell you with hot glow plugs and a healthy battery it will start up as soon as I think about touching the start button.

You don't need starter fluid, or a new battery (given that you say it turns over healthily, you need to methodically figure out what the problem is. You need compression, fuel, air, and maybe some heat, and it will start. Find out which one is missing.

The clue might be in the history. What did you do last?

You say there is no air in the fuel. How do you KNOW? I suggest bleeding from the screw right on the fuel injection pump body. This would be my very first step if my engine turned over but did not start.

Bristol 31.1, San Francisco Bay
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post #12 of 17 Old 04-25-2013 Thread Starter
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Re: Restart is hard after the winter

I have bled the screw right next to the injector body, the flow is nice constant and not bubbling.

The voltage is 10V when heating the three glow plugs, when starting only it is a bit higher.

The last thing i did on the boat was fuddling around with the start panel (rebedding), but electrically i see everything is working.

I wil wait for my new battery for now.


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post #13 of 17 Old 05-07-2013 Thread Starter
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Re: Restart is hard after the winter

I got a new battery.
I managed to start the engine by using a thick jumperwire from the pos battery pole to the glowplugs. WD 40 helped also :-)
The startmotor seems to be normal.

BUT: if i try use the glowplugs the normal way, the relais switches off after 20 seconds...
Its a relais from Ford cars rated for 70 amps.

I will order a new relais online.


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post #14 of 17 Old 05-07-2013
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Re: Restart is hard after the winter

bart, it sounds like your Ford relay is a starter motor relay. Those normally do not have any type of timer or thermal overload protection built into them, so if it is switching off there may be another component that is cutting off power. A thermal breaker or a timer perhaps?
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post #15 of 17 Old 05-07-2013
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Re: Restart is hard after the winter

I have a lingering doubt over the glowplugs themselves... 20s of heating should be enough to get the engine started. They do have a tendency to age and become less and less effective... if problems persist I would consider replacing them. The price should be reasonable from a Kubota parts supplier (not a marine supplier)

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post #16 of 17 Old 05-07-2013
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Re: Restart is hard after the winter

1. Release the glow plug button before you hit the start button. Do NOT hold them both down at the same time.

2. You may have a glow plug solenoid (relay) installed. For your M25 engine, it is an aftermarket addition since they did not come with the engines. I installed one on our boat, it's a cheap Ford solenoid. You might be interested in this and other subjects in our C34 Critical Upgrades: CRITICAL UPGRADES - DO THESE OR ELSE!!!

The glow plug solenoids are here: Faster, More Efficient Glow Plug Heating with a Solenoid - C34

Stu Jackson, C34, 1986, M25 engine, Rocna 10 (22#)
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post #17 of 17 Old 05-07-2013
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Re: Restart is hard after the winter

Quote:
Originally Posted by bartvdv View Post
I got a new battery.
I managed to start the engine by using a thick jumperwire from the pos battery pole to the glowplugs. WD 40 helped also :-)
The startmotor seems to be normal.

BUT: if i try use the glowplugs the normal way, the relais switches off after 20 seconds...
Its a relais from Ford cars rated for 70 amps.

I will order a new relais online.
I had a VW diesel. IIRC, the glow plug relay would hold for about 10 seconds and then shut off and stay off for a minute or so. As we were often in very cold weather, I Installed a separate switch to a separate solenoid which fed battery to the glow plugs so I could over ride the automatic switch. Never had to glow much more than 10 seconds, but it allowed me to try again, if needed, without waiting.

Paul T
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