Komatsu Dozer wont start

[finn1]

Pull the air inlet tubing and check for signs of dust in the intake tract. A leaking intake system will dust the cylinders, creating poor ring sealing and low compression pressure.

Diesel engines require good ring sealing and compression pressure to develop sufficient heat in the cylinder to ignite the fuel.

Poor cold starting is a first esign of a worn out power cylinder.

Don稚 be afraid to give a shot of starting fluid to get the thing running.

 

[JimP]

Is the engine shutdown manual or electric? I have a dresser TD9H which was also branded as a Komatsu. The engine throttle lever in the full forward position shuts down the engine. In the full forward position the lever engages a small electric switch that shuts fuel off inside the pump and shuts down the engine. When you pull the throttle lever back the switch opens. I left the lever in the shutdown position and the switch rusted closed. When I pulled the lever back to the start position the switch remained off and the engine would not start. It took me a while to track this down. A little WD40 and the switch was movable and the engine started. Jim

 

[RonMar]

White/grey smoke also indicates not enough fuel being delivered to actually fire, just make smoke. You can also experience this when it is too cold. This thing have glowplugs? Are they working?

 

[KyleB83]

Im working on unsticking the throttle.. it does have glow plugs, but when its 95 degrees out, I wouldnt think to even see if they are heating. We are still leaning towards a fuel issue, whether it is low pump pressure or an injector issue

 

[aczlan]

Im working on unsticking the throttle.. it does have glow plugs, but when its 95 degrees out, I wouldnt think to even see if they are heating. We are still leaning towards a fuel issue, whether it is low pump pressure or an injector issue

Our 2003ish Kubota B7500 needs the glow plugs to start even when we are doing hay.
Try them just to see.

Aaron Z

 

[KyleB83]

This would be much easier if the service manual was half decent. Don稚 waste your money on a Komatsu manual folks

 

[thepumpguysc]

Don't fore*go the glow plugs BECAUSE its 90*'s outside.. THATS some bad think'n..
Its NOT 90* inside the engine.. the engine is "cold".. THATS WHY the GP's are there.. for "cold starts"..
Now once its started and ran, u might not need them.. BUT for cold starting u def. do..
Good luck.

 

[KyleB83]

Makes sense.. but, wouldnt a blast of starting fluid make up for a lack of glow plugs if they are bad?

 

[finn1]

Does the engine in question actually have glow plugs, or is it an electric intake grid?

I an mot familiar with any direct injection industrial engines with traditional glow plugs.

Indirect injection light duty , and direct injection pickup truck engines, yes, but not heavy duty industrial engines.

 

[KyleB83]

Man, you tell me and we will both know lol. The manual is absolute crap but I will verify tomorrow if I wake up in time before I leave for work

 

[thepumpguysc]

The glow plug are thin rods that screw into the cyl. head in each cylinder, right by the injector & have a wire on it or a connection bar that connects all of them together w/ 1 wire feeding them 12v when activated.
The GP's look like 1/2 a pencil & are about that size around..
OR it might have a larger screw plug into the intake manifold w/ a wire going to it. that heats the air as it get sucked into the engine at starting{when activated}
Google is your friend..

 

[Sawyer Rob]

My FARM tractors are direct injection and they have a single glow plug in the intake tract. It's a different type of glow plug though, not the kind described above.

Unlike my tinker toy tractors, my farm tractors don't need to be "glowed", to start them in most any temperature, even in the winter. (depending on the individual tractor)

SR

 

[KyleB83]

 

[hawkeye08]

I'm not seeing any glow plugs there..

 

[KyleB83]

 

[hawkeye08]

could this be the glowplug?


Maybe flat bar is 12v? does it connect to a wire on one end?

 

[aczlan]

could this be the glowplug?
View attachment 609608

Maybe flat bar is 12v? does it connect to a wire on one end?

It probably is.

Aaron Z

 

[KyleB83]

PROGRESS!!

I replaced the hand primer pump and pumped it about 30 times to bleed the injection pump, and it fired and ran for probably 3-4 minutes before it sputtered and died. I am connecting the battery chargers to it while I sleep and will try to bleed it again before work tonight. Think there may have just been air in the system that I could not get out and hopefully the sputtering and dying was another pocket. Weak batteries now from trying to crank it the last few days wont work like they should. Hopefully in a few hours I can report back that this entire headache was caused by good old air!

 

[thepumpguysc]

That BAR UNDER the injectors is the connection for the GP's.. U can clearly see them..
IF u have a test lite or multi-meter, check to see if they're getting 12v when u turn the key ON..
SOME operate when u turn the key to the LEFT..
I THINK I told u to use the hand primer, way back.. when this 1st came up.??

 

[D2Cat]

If you decide you need to pull the injectors or glow plugs, you need to seriously clean the area first, or you'll have more troubles than now!