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Messages - SiFi

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Engines / Re: LPWS4 Injector Pump not 'spitting'
« on: November 11, 2022, 09:22:42 PM »
Thanks, I did take out one of the injectors that i thought wasn't working and today it was, so that was encouraging!

Have you disconnected the fuel lines comming out of the pumps going to the injectors then cranked the engine over to see if any fuel is exiting?

If not then go back to square one and bleed the fuel system at every point. Tank, filter in and out, pumps in then as I have asked pumps out while cranking the engine over?
If yes so far then crack the fuel lines at the injectors and then finally pull the injectors out of the head and see if they atomise the fuel. WARNING, do not put any part of your body near the atomised spray or you will be in pain and very dangerous to have fuel inside of YOU. So once you discover at what point the fuel stops from going any further then you know where the problem is. Once that is known then we can go further to find the issue.

Previous post from wheelMA1 about the pump is very relevant too.

Engines / Re: LPWS4 Injector Pump not 'spitting'
« on: November 11, 2022, 09:16:46 PM »
Thanks I'll check the site out.

I think your engine is what is in military gen sets.
More info may be available on the "Steel Soldiers" site.

Engines / Re: LPWS4 Injector Pump not 'spitting'
« on: November 11, 2022, 09:14:55 PM »
Thank you everyone for your contributions.

I've discovered today that two of my glow plugs are dead and have ordered replacements. I removed one of the injectors and it does appear to be working now so maybe fingers crossed it just needed more time to bleed.

What I discovered today is that the fuel shut-off control only rotates a few mm and not enough to move the governer rack for the injector pumps into shut-off. I'm assuming there is no sort of interlock that I need to disable. The throttle seems to move back and forth freely.

Engines / LPWS4 Injector Pump not 'spitting'
« on: November 09, 2022, 05:13:40 PM »
My engine won't start and two of the injector pumps don't appear to be working.  I disconnected the feed to each injector and only two were spitting fuel. What is the most likely problem, what I should do next?

Listeroid Engines / LPWS4 Injector Pump Help
« on: November 07, 2022, 10:28:15 PM »
I'm a diesel novice and my narrowboat engine refuses to start!

I've loosened the high pressure connections to my injectors and only the middle two are 'spitting fuel' when I turnover the engine.  I need to check that the problem pumps are receiving fuel.

What else can I check?

I also measured the temperature of the Glow plugs, three seem to be working.  At the moment I appear to have just one cylinder where both the injector pump and glow plug are working. No idea how to check the injectors.

All suggestions/advice welcome, thanks

Engines / Re: Earthing Solenoid on a LPWS4
« on: November 07, 2022, 09:11:54 PM »
Thank you everyone for your help. It is a marine engine in a narrowboat.  In the name of simplicity I wonder whether an earthing strap would be better.

Engines / Re: Earthing Solenoid on a LPWS4
« on: October 30, 2022, 09:54:32 AM »
... circuit diagram

Engines / Re: Earthing Solenoid on a LPWS4
« on: October 30, 2022, 09:52:15 AM »
Thanks for your replies.

Here is a screenshot of the circuit diagram, on the left item 4 is described as 'earthing solenoid' (relay) and item 11 in the centre is the 'glow plug controller' (relay). The photo shows the relay socket on the left with the dark greenish cables, one going to starter -ve and the other to engine casing.

I want to recheck that the earthing relay is opened when the glow plugs are energised.

Engines / Re: Earthing Solenoid on a LPWS4
« on: October 29, 2022, 12:53:35 PM »
Why would the earth on the starter be earthed via a 70A relay to the engine casing? The relay opens when the glow plugs are energised.  There is something called an "earthing solenoid" in the handbook circuit diagram that is connected the same.

Engines / Earthing Solenoid on a LPWS4
« on: October 28, 2022, 11:57:18 PM »
Any idea what it is does?

It's in the handbook circuit diagram. I have a 70A relay wired much the same on my engine.  The earthing stud on the starter is earthed to the engine via the relay. The relay is switched OPEN when the glow plugs are energised.


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