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3 Days Ago 08:02 PM
Re: Universal 5424 Diesel

Again, see this thread
3 Days Ago 07:45 PM
Re: Universal 5424 Diesel

And some good news at last. Thanks for all comments and advice.
The suspect Centre injector was changed to number 1 position & to my relief the foaming symptoms were repeated there. Once that one was changed back to one of the retained older injectors the problem disappeared.
So a lesson or two learnt. Do not necessarily trust new injectors if foaming occurs.
And I have a serviceable spare (very expensive!) injection pump that was not needed.
3 Days Ago 12:52 PM
Re: Universal 5424 Diesel

The suspect injector is one of three new ones. Two of the old ones seem to be in fair shape at least for test running purposes. Agree reference pop tests, but ... Will shortly will try changing what I have and advise. Thanks again for being there - feeling a bit remote and helpless right now. Would really like to be able to get off the dock!
3 Days Ago 12:31 PM
Re: Universal 5424 Diesel

IMHO the "proper" way to troubleshoot and fix this problem would be to "Pop-Test" each injector. I was never able to find a local diesel mechanic that would do a pop-test on the Kubota injectors. However, the cost of a new injector was only ~$50, and the tool to do the pop test is about $200.
3 Days Ago 12:00 PM
Re: Universal 5424 Diesel

Thanks eherlihy. Reassuring to know I am not alone in getting this problem. Very helpful to learn of your experience.Now will swap injectors.
3 Days Ago 10:47 AM
Re: Universal 5424 Diesel

I encountered some foaming around the rear injector of my M25. This is why I bought and installed new injectors and copper gaskets. Once the new injectors were installed, I had foaming around the middle injector... I swapped the middle injector with one of the old injectors (wish that I had them labeled), and this fixed the problem.
3 Days Ago 09:56 AM
Re: Universal 5424 Diesel

Thanks Ajax_MD.
Your are right timing should be done - shims are ready.
Before checking that, the issue remains of appearing to get air in the injected fuel at number 2. Next stage is to swap injectors around in case one of the new injectors is defective and allowing blow back somehow to give symptoms of air in fuel.
All thoughts and ideas appreciated.
Unfortunately here in Antigua to where I have now returned mechanics so far encountered while keen do not have the qualifications/expertise one might hope for elsewhere!
3 Days Ago 08:56 AM
Re: Universal 5424 Diesel

The injector pump is set from the factory for each, individual engine. My understanding is that it uses a set of shims to properly time the interval and duration of fuel delivery.
The manuals strongly suggest that a factory rep or qualified diesel mechanic set the injector pump, but there are procedures available for you to try it yourself.

In fact, here is a link to the procedure for setting the fuel timing:
Universal Diesel Engine Owners Manual - Fuel Injection Timing - Marine Diesel Direct / TOAD Marine Supply
4 Days Ago 05:48 PM
Re: Universal 5424 Diesel

"Foaming" or fuel spitting with air (?) is coming from central injector feed pipe when opened slightly at injector. 1 and 3 cylinders when connection to them cracked open spit out fuel fuel strongly as they should. With the central one speed reduces when cracked open but there is a slight delay when tightened up. With 1 & 3 there is no delay. When engine is speeded up there are unusual noises suggesting (?) bad combustion plus gray exhaust smoke. The central injector seems to be trying to deliver air and fuel.
The issue occurred first when running engine on gravity fuel feed ashore. Injector pump was replaced when above symptoms occurred. apart from final connection to injector pump the onboard fuel systems on boat do not seem to be part of issue. Slight possibility exists that some damage to injector pumps occurred due to running without pressurized feed. Not sure how significant that might be for short runs.
4 Days Ago 05:31 PM
Re: Universal 5424 Diesel

Where does this foaming come from?
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