Engine locked up

[opeth]

Need help. I rolled over l47 kubota. Now back in upright position engine is locked up with engine oil. I suspect oil found its way to intake manifold. Is there a decompression valve or what is the best way to fix it. Would manual spinning of the crankshaft help?. Any advice appreciated

 

[Edke6bnl]

I have always herd to remove the injectors and then spin over.

 

[Elliott in GA]

Removing the Glo Plugs followed by manual spinning is supposed to be the easiest method.

 

[D2Cat]

Need help. I rolled over l47 kubota. Now back in upright position engine is locked up with engine oil. I suspect oil found its way to intake manifold. Is there a decompression valve or what is the best way to fix it. Would manual spinning of the crankshaft help?. Any advice appreciated

Do not try to start the engine until you open up each cylinder by either removing the glow plugs or injectors to clear all liquids. If you don't get all the liquid out of the top of the cylinders and turn the engine over you will likely bend the rods and loose compression.

 

[GreensvilleJay]

REMOVE BATTERY NOW !!!!! REMOVE, NOT disconnect, there is a BIG difference !!!!
Do NOT spin engine over using starter !!!!!!!!!!!!!!!!!!!!!!!!!!!!

 

[RCW]

First, certainly hope no one was hurt…..

I have to ask - - how do you know the engine is locked up?

Did you try to start it? Did it fire if you tried to start it?

Seems like there’s been several occasions with tractors on their side in the last couple weeks.

 

[motorhead]

I STRONGLY agree with turning the engine over by hand and NOT the starter, with either the glow plugs out or the injectors removed. Once you know the engine is free turning, then you could use the starter.
When you look at old WWII Airforce pictures or film footage, you see ground crews hand turning the props on radial engines for a couple of revolutions to make sure that the bottom cylinders weren't hydro-locked.
Keep us posted.

 

[GreensvilleJay]

for SURE, really ,really bad things WILL happen if 'hydrolocked' !! Things that WILL cost 1,000s of dollars to fix and a LOT of time.

 

[Oleracer]

Yep pull glow plugs than spin over a couple revolutions by hand. After you get a couple revolutions you can spin it over with starter. Its gonna smoke like a sob when you first do start. Don’t be alarmed.
good luck

 

[GreensvilleJay]

hmm, maybe blow compressed air into the glowplug holes, to get 'most' of the oil out ?

 

[North Idaho Wolfman]

Need help. I rolled over l47 kubota. Now back in upright position engine is locked up with engine oil. I suspect oil found its way to intake manifold. Is there a decompression valve or what is the best way to fix it. Would manual spinning of the crankshaft help?. Any advice appreciated

Pull the glow plugs, turn engine over by hand, then after several revolutions, turn the engine over with the starter.
Check the air cleaner.

 

[lugbolt]

exactly why I think that the way Kubota designed the intake and crankcase vent hose was not a great idea. Allows oil to run right into the intake. Engine can run on it's own oil, creating a possibility for runaway-and I have seen it happen.

remove glow plugs and battery. Once the glow plugs are out, grab the fan and turn the engine over by hand. It'll take a number of turns to get the oil out, so be plenty patient. Hopefully nothing is hurt.

 

[PaulL]

I always feel like these threads almost give enough information, but not quite enough.

I think my summary of what others have said is:
1. Rollover can lead to liquid in the cylinders. Liquid doesn't compress, so if there is more liquid in there than fits in the combustion space, if you turn it over it has to bend something. So never turn it over by starter when there's fluid in the cylinders that has nowhere to go

2. To solve that you need to give the fluid somewhere to go

3. Take out the glow plugs - this gives somewhere the fluid can escape to on the compression stroke

4. Turn the engine over by hand, because the starter will turn it too aggressively, the fluid may not escape out the glow plug holes fast enough without breaking something

5. Once you've turned it by hand, it's not clear to me if you put the glow plugs back in and crank with the starter, or whether you turn it with the starter for a bit with the glow plugs out, to clear any residual?

6. Then you put the glow plugs back in, and try starting it with the starter

7. It's probably got oil and crud all through it, so it'll smoke for a bit until that all burns off

Is that basically it?

 

[North Idaho Wolfman]

5. Once you've turned it by hand, it's not clear to me if you put the glow plugs back in and crank with the starter, or whether you turn it with the starter for a bit with the glow plugs out, to clear any residual?

You leave the glow plugs out and crank it with the starter.
This blows out any residual oil and it also uses the injected diesel to help wash out the cylinder.

 

[PaulL]

You leave the glow plugs out and crank it with the starter.
This blows out any residual oil and it also uses the injected diesel to help wash out the cylinder.

Excellent. When do you put the glow plugs back in? Give it 30 seconds, call it done? Or when nothing more is coming out? Or when you feel lucky?

 

[hagrid]

*scans horizon for OP...

 

[North Idaho Wolfman]

Excellent. When do you put the glow plugs back in? Give it 30 seconds, call it done? Or when nothing more is coming out? Or when you feel lucky?

Combination of nothing but clean fuel vapor coming out, and feeling lucky.

 

[North Idaho Wolfman]

*scans horizon for OP...

Well that last time he was on all he got was @GreensvilleJay yelling at him, so there is that.

 

[GreensvilleJay]

I wasn't YELLING, just 'stressing' the fact that if he spins a locked engine with the starter it'll cost him a lot of money

there is this better ?

 

[North Idaho Wolfman]

I wasn't YELLING, just 'stressing' the fact that if he spins a locked engine with the starter it'll cost him a lot of money

there is this better ?

Yes much better!