Rolled my tractor....Engine won't turn over!

[HawaiinFarmer]

What about crank? It looks perfect,the bearing for the piston was untouched. All other pistons are smooth as silk operating wise.

 

[IH3444]

The crankshaft needs to be setup on a fixture to besure that it is not bent. This amount of force that bends connecting rods, also has been known to bend the crank. It looks straight, but may be tweeked. It will then not run true in the engine block, and will rapidly wear out the main bearings. Better to be safe. Remove it, and have a machine shop which specializes in crankshaft grinding, set it up and dial indicate it for straightness. It maybe OK, or it maybe tweeked. You just don't know now. Better to be safe. Hydraulic lock up is tough on engine components, but you know that now. Have buddies with racing boats. Boat flipped, suck in water, engine hydrolocked. $$$$$$$$$ later, boat back running.

 

[Willl]

i need some info on the push rods should they have a bend at the top or should they be straight?

Straight, as in straight-as-a-arrow.

Roll them on a flat surface, any that wobble gets replaced.

 

[Dead Horse]

Another thing that happens to the crank journal on a hydrolocked cylinder (and is what I referred to as a "nick") is that the center mass of the rod in contact with the bearing and journal, as it is compressed in the hydrolock "event", creats a flat spot on the crank. You Generally cannot see it with the naked eye and thus have to take a micrometer to the journal to make sure it is still "round". Thus "mic the crank".

You now know which cylinder you "locked" so that is the first journal to have checked out.

Putting that engine together with out certifying the crank is very likely an expensive experiment. However, it is your money. If that journal is even just a tad out of round it will eat the bearing up in no time...........

Like I said, I had a good seat on the sidelines for this particular lesson.

And re your last question...... piston rods or push rods????????? either one should be straight up........... no bends......none, zilch!

 

[rdsaustintx]

PHOTOS. PHOTOS. PHOTOS.

 

[Redneck in training]

Can somebody explain how the liquid got above the piston? I can't imagine that coolant would get there, or fuel (the injected amount is small and would get burned/expelled at every revolution). So what is left is oil. In order to hydro lock the amount of liquid has to be quite large and enter the combustion chamber within one revolution. I am thinking that if it would enter the combustion chamber in small amount it will be blown out before it could lock the cylinder.
I can imagine that even if the combustion chamber is half full that it will increase compression pressure that could possibly cause engine damage. So can somebody shed light on what was the sequence of events and the mechanism of getting liquid to the combustion chamber leading to engine damage?

 

[kenstrac]

Sorry for not responding...Holidays
Ok to make short and concise.

Took the oil pan off and sure enough a bent piston arm on the # 1 cylinder.
Secondly i need some info on the push rods should they have a bend at the top or should they be straight? all have a bend at the top but some look more or less than others. Looks like the compression might of bent the push rods.
Cylinder and bearing looks good so am I able to replace the piston and piston arm or do a I need to resurface the cylinder chamber?

Sincerely,

Destined to be a Kubota master mechanic...(like it or not)

P.S I'll be ready for the next guy who rolls his 5038

OK I don't know how many hrs on engine ,but it sounds to me that the valves were out of adjustment and when you laid it over the push rod got jambed somehow and held the valve open and it kissed the piston.
First I would remove the crank and camshaft and have it checked check to see if cam gear key is still good replace conn ron and bearing,piston rings .
Have head magnafluxed check valve guides replace valves ,
Have rocker arm shaft checked Replace rocker arms and rocker arm supports in the area that you have bent rods.
As far as the cyl wall mic. it if it within specs.run a hone in it and you should be OK.
Good luck.

 

[Dead Horse]

Can somebody explain how the liquid got above the piston? I can't imagine that coolant would get there, or fuel (the injected amount is small and would get burned/expelled at every revolution). So what is left is oil. In order to hydro lock the amount of liquid has to be quite large and enter the combustion chamber within one revolution. I am thinking that if it would enter the combustion chamber in small amount it will be blown out before it could lock the cylinder.
I can imagine that even if the combustion chamber is half full that it will increase compression pressure that could possibly cause engine damage. So can somebody shed light on what was the sequence of events and the mechanism of getting liquid to the combustion chamber leading to engine damage?

We are guessing here.........

My guess is either fuel or oil leaked in from a a source associated with the roll over event. Only way to be sure is forensics. if I looked at the motor I could have a lot better idea.....

It just "acted" like hydro lock......... so that was my quess.

Big ford truck engines with carburators had a bad habit of "post nasal drip" if you parked them on a hill......... I saw one locked up because of that. It takes surprisingly little liquid to lock one up...... combustion chamber plus a smidge more...

 

[rdsaustintx]

What happened may become more obvious when he pulls the head. Now that he has found a bent rod, this engine needs serious disassembly. And this thread needs serious photos.

Seriously.

 

[Slacker]

Just tagging for outcome. I figure the most likley culprits are fuel or oil in combustion chamber, operator uprights the machine and cranks it over. #1 piston was on compression stroke and it got the bent rod since it could not compress straight fuel or oil.
The OP mentioned he smoked the starter...so it may have been a few tries to compress what cannot be compressed.