Komatsu PC10-6 smokingafter running out of fuel

Jason Jayko · May 28, 2019

Have a kamatsu pc10-6 that was running good until this weekend. It ran out of fuel and is now blowing whitish smoke while running. Cleaned the fuel bowl that had about 2 inches of settlement in it. Fresh fuel. runs and moves, hydraulics all good. doe bog down when under heavy load or scraping ground.. Thanks In advance for any tips.
I also noticed that when purchased it had a choke cable but down see it in any manuals and there is a small rod that was disconnected where the choke cable went to.

John C. · May 29, 2019

You need to change the fuel filter also. I believe that also has an electric fuel pump. Is it working properly?

Jason Jayko · May 29, 2019

pump is working. found that there was no fuel filter installed. going to get a couple ordered. also replaced fuel lines as most were loose and cracked. took tank off and cleaned as it had a tone of sludge in the bottom.
This one also had a choke install when it was purchased last year but don't see any thing referencing or showing a choke in any maunuals or pictures. looks like they bypassed motor stop motor and disconnected the spring.

Delmer · May 29, 2019

YIKES!

There is no choke on a diesel, is there a place on the injection pump for the cable to hook to? like a cold weather start. Or is that your improvised shut off? nothing wrong with that.

It looks like this is a yanmar engine? I don't know yanmars, but anything japanese, the first thing to do is look for a screen inside a banjo bolt, or whatever would catch the junk downsteam of the missing filter. This is one case where you'll be relieved to find a plugged up banjo bolt screen instead of pssed off at why they'd ever do such a crazy thing.

John C. · May 29, 2019

They might have a screen but I've never found one in this mighty mites if they had the water separator strainer. It is worth checking though.

Jason Jayko · Jun 2, 2019

Cleaned tank and lines, installed fuel filter and. hooked stop motor spring backup. Started back up and still white smoke. Could it be be one of the injectors. Just took the pipes of and cheked them for cracks and blocks , all good. notice 2 injectors had fuel sitting on thetop and the middle was dry. spray diesel into each, little while later the middle injector was empty again. Is there a special tool to remove the injectors?

Delmer · Jun 2, 2019

Yeah, if the injector is draining like it sounds like, that's bad. These are pump -line -injector right? Loosen that center line while it's running and if it stops smoking, that's your answer.

Jason Jayko · Jun 9, 2019

Took injectors out and nozzles where pretty clogged. On plunger was stuck after multiple soaks was able to get it out. Cleaned and was able to get diesel to squirt out of each nozzle before putting back together. Reinstalled .turns over but won’t start now. No leaks. Getting fuel. Possible the injectors where just that shot

Delmer · Jun 10, 2019

Did you have to mess with the popoff pressure to unstick the plungers? how did you get it back where it was?

IF you figured out the popoff pressure setting, did you bleed the air out of the injectors and lines before you tightened the lines back up?

What does "getting fuel" mean? is there fog coming out the exhaust?

thepumpguysc · Jun 10, 2019

When u took the injectors apart, did u notice a "spacer plate" between the tip & the body.??
Did it by chance, have tiny roll pins in it.?? or roll pins in the body itself.??

Jason Jayko · Jun 10, 2019

the order was assembly then shim inside first, spring then seat,then plate(with 2 role pins), nozzle, then nut. there was also a plastic spacer on the nozzle that was between nozzle and nut with a ring on it.
pulled pipe off at injector to verify fuel is getting that far and it is.

thepumpguysc · Jun 11, 2019

That sounds right.. what did u torque the nozzle nut to.??
Have u hung an injector outside the engine to SEE if its firing.??
DO NOT get near the spray coming out of the tip.!!!
IT WILL penetrate your skin & give u blood poisoning..

Jason Jayko · Jun 12, 2019

So yesterday I hung the injectors outside the engine to see if its firing and it is not. No spray at all.

Vetech63 · Jun 12, 2019

You may not have it bleed of air yet. Try moving the stop lever in the other direction first to make sure it's not in the stop position.

thepumpguysc · Jun 12, 2019

Any chance in posting a picture of the pump.?? cuz I'm lost w/ this "choke" thing..
Or u can send it to my home email.. click on my screen name to the left & my contact info is on my profile page.

Jason Jayko · Jun 13, 2019

Here is the picture. We disconnected the Choke cable and hooked the engine shutoff back up. You see the chcable just laying there now. Also was able to get it started lastnight. It idled high night throttle was stuck open even if i move it to low. had to shut fuel off to shut it down. found the Shutoff motor could not move. The arm connected to the injector pump seams stuck. No free play. possible blockage there.

Vetech63 · Jun 13, 2019

LOL @ choke cable. TPG needs a pic of the entire injector pump so he can help you.

thepumpguysc · Jun 13, 2019

I think I'll sit this one out..?? Lol

Jason Jayko · Jun 13, 2019

Here’s 2 pics

thepumpguysc · Jun 13, 2019

Great !! pictures w/ no explanation of this "choke cable"..
I can see from your pic u TRIED to get into the side cover..
THATS where u NEED TO go.. but u cant get in there w/ a screwdriver.. u HAVE TO USE a hand impact w/ a Phillips head bit {#1} & a hammer..
Once the cover is off, pull the throttle to wide open & pull the stop back & forth..
{I wont bother w. the techn. terms}
The innards should be moving back & forth..
IF u screwed up that screw so bad u cant get a bit in it..??
U could get some vise grips.. give it a couple good wacks w. a hammer & BRASS DRIFT 1st..
OR if u can get to the "CAP" on the front of the pump.?? remove it & do the throttle & shut off thing & WATCH THE RACK to see if it moves in & out.. {the thing that's sticking out once u remove the cap}

Komatsu PC10-6 smokingafter running out of fuel

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