D905 no start issues

[Rockcrawlerkirk]

Hey all, new to forum and new to diesel and it's repairs. I have a d905d powered generator. It was given to me so I don't know much if any history. Ive tried starting it but no luck. It didn't seem like it wanted to fire up... Just spinning from starter. Once or twice it acted like it wanted to fire off, but then nothing. I pulled injectors out and apart to give them a look over and slight cleaning. I've pulled the fuel shut off solenoid out and checked for correct operation and it pulls in when starter is activated and stays in till key switch is turned off. The slide it activates seems to slide back and forth.
Now, this is where I'm definitely a virgin when it comes to diesels, I bled the lines up to injectors and I see fuel pulse at open fuel lines at injectors, but it doesn't seem like much pressure with each pulse. Also, question.. should I be seeing fuel on return line off of injector rail going back to tank... Is it normal? I do see a constant flow on that return line. With all that I've said and done, is there something I'm not doing right or missing?
Thanks in advance

 

[Dave_eng]

You make no mention of Glow Plugs which are often needed to get a Kubota to fire.

Fuel in the injector drain line is to be expected but in small quantities.

Did you bleed the lines at the injectors with the throttle wide open.

The quantity of fuel with each pulse is small but in operation the pulses are occurring multiple times per second.

Because the fuel quantity is small per pulse and there is no restriction when you have opened the line to bleed, you do not see a high pressure stream shooting out.

For the next time,..... better to avoid taking apart injectors. You can remove them and observe their spray patterns.

Dave

 

[Rockcrawlerkirk]

Thank you Dave for responding. I did pull the glow plug common rail off and checked ohm reading which was 1.2ohms on each one. I pulled the glow plugs out just to visually inspect them. I did not put voltage to each one off the engine to see if they are glowing hot though.
One other question I had was how to check compression. Gas engines and pulling plugs is easy, but where would I check a diesel engine compression and would low compression be a possibility as to why this won't fire up?
And yes, I cracked the fuel lines at the injectors and cranked it over till I saw fuel pulsing around the line connection. Seeing that it's a generator and fixed throttle, I don't have the ability to open throttle wide open. Any suggestions as to how I can get around that?

 

[Dave_eng]

Thank you Dave for responding. I did pull the glow plug common rail off and checked ohm reading which was 1.2ohms on each one. I pulled the glow plugs out just to visually inspect them. I did not put voltage to each one off the engine to see if they are glowing hot though.
One other question I had was how to check compression. Gas engines and pulling plugs is easy, but where would I check a diesel engine compression and would low compression be a possibility as to why this won't fire up?
And yes, I cracked the fuel lines at the injectors and cranked it over till I saw fuel pulsing around the line connection. Seeing that it's a generator and fixed throttle, I don't have the ability to open throttle wide open. Any suggestions as to how I can get around that?

Being a new forum member you are not able to post photos.

I am going to send you a PM (private message) with my email address.

Send some photos of the controls for the genset to my email address.

On a tractor, the key switch would send power to the Glow Plugs through a Glow indicator ( a small coil of wire) that would start to glow red as the GP's heated up. When the key switcch was turned to the crank or start position, the GP's would get power directly bypassing the glow indicator.

Low compression will prevent a diesel from starting. Typical way to check is using the GP holes.

Dave

 

[Dave_eng]

I am posting the photo for the owner of the Kubota powered Genset.

Below is his message

I'm attaching a picture of my Kubota powered generator. It was pulled out of a portable light plant/stand. As for controls, it didn't have any so I improvised with a key switch and separate start push button. The key in the "on" position provides +12 volts to the glow plugs and the hold in side of the fuel shut off solenoid, as well as the switched side of the alternator. The push button for starter provides +12 volts to the pull in coil of the fuel shut off solenoid via the +12 volts to the starter solenoid. I checked the fuel shut off solenoid for it's correct function and it is pulling in when starter is activated and does not release till the key switch is turned off. I think the only thing I haven't checked is compression.
My other question would be, when I'm trying to start it and with a volt meter reading my battery voltage, I'm seeing the voltage drop from 12.1 to 9.3 volts. Is that going to be an issue with the glow plugs?
The picture I've sent shows the levers on the side of the fuel injector pump, and I was wondering if the one that is fixed would be the throttle so to say that you mentioned opening up while trying to bleed? The other lever forward of it does move but I have no idea what it does.
Thanks for any help you can send my way,

Perhaps someone will recognize the engine and can advise re the levers on the injection pump. Further, what model of tractor this engine may have been used in. I see B1700 using the D905 engine.

I am suggesting the owner try and find engine identification and provide it here.

The wiring for the GP's seems wrong as far as being ON when the key switch is ON. In this configuration the GP's may have failed if ON too long.

Dave

 

[Rockcrawlerkirk]

Is the GP 12 volts power only for a moment and not on all the time in diesels? I know it sounds like a stupid question, but this is the first diesel anything that I've ever owned.

 

[Dave_eng]

Is the GP 12 volts power only for a moment and not on all the time in diesels? I know it sounds like a stupid question, but this is the first diesel anything that I've ever owned.

Yes, the GP's are only to heat briefly before starting and also during the cranking of the engine.

The preheat time before cranking is based upon temp but is a few seconds.

Dave

 

[lugbolt]

yes low compression can cause no-start condition.

Diesels are considered "compression-ignition" engines, no glow plugs or spark plugs needed to run, just the heat of compression is what ignites the fuel/air mixture. Without the needed compression, it just ain't gonna run.

 

[Russell King]

Since you have taken the injectors out...
Did you replace the sealing washers or just use the same ones?

I assume they are copper sealing washer and may not seal well if reused.

I suggest you remove the injectors again and then see if you can arrange one the fuel lines to the injector so you can verify what type of spray patterns the produce. (Arrange so the tip is free in space and injector is connected to the fuel line.)

BUT this is dangerous and can inject the fuel through your skin! Don’t do it if you’re uncomfortable with that information but take them to a diesel shop to be tested..

Use a piece of cardboard large enough so you are out danger and hold it under the injector tip and see what the spray pattern from each injector looks like. Take pictures of each injector pattern and post them. Use new cardboard for each injector. Someone will comment they are good or bad patterns.

You will have to bleed the fuel line each time you change the injector.

Then if the patterns are good replace the sealing washer or anneal the ones you have if you want to cheap out a little. See if it starts. If so move on with the project if not reevaluate what the problem may be.

If the patterns are bad replace or have the ones you have rebuilt.


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