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stuck engine

J

jim buford

Member
I have an 8N with a stuck engine. Question I have is how much fluid should be put in the spark plug hole so as not to have hydrolock and would it be okay after a few days to simply bump the starter with the plugs out? I have never had this problem before but appreciate all the advice I can get. Thanks
 
As long as the plugs are out you can do anything you want.
If and when it comes loose spin the starter until nothing comes out of the plug holes.
 
All you really need is enough to cover the top of the pistons so the oil will start soaking it's way down around the rings. Just a few squirts with the oil can will do. You can't liquid lock it with the plugs out, but can make a real mess if too much oil is in there when it breaks loose!
 
i have to disagree with the statement that you can't damage the engine with the plugs out, if it comes loose and the cylinder is full of oil you would have a real hydraulic effect trying to get all the oil out that small hole as the piston came up, could well bend a rod or break a piston
 
I would put a cup in each, it it runs out, so what. I do think it is prudent to crank the engine over by hand a couple of times with the plugs OUT to make sure the bulk of the liquid is out. I do not know of the engine would get all the liquid out in time not to bend something if it zinged over, even with plugs out
 
I don't think so. The pressure of firing under load at WOT would be more than you would get with a plug out.
 
(quoted from post at 14:09:20 02/02/16) I have an 8N with a stuck engine. Question I have is how much fluid should be put in the spark plug hole so as not to have hydrolock and would it be okay after a few days to simply bump the starter with the plugs out? I have never had this problem before but appreciate all the advice I can get. Thanks
Click to expand...
I have unstuck many engines. I always used about three or four ounces, per cylinder, of "liquid Wrench" or other penetrant but the best is transmission fluid and Acetone mixed.
I never use the starter but rather rock the engine by pushing forward and backwards with wheels.
Depending on location of piston in relation to crankshaft will dictate what direction engine need to turn.
I use starter after freed up.
 
did it seize from standing water in the cylinders or just from sitting? the amount of rust in the cylinders can make a difference. Bill
 
same here - rocking it back and forth like that gives you a good feel for it so you don't over do it.

It can take a lot of rocking, but if you're not in a rush, you can just do a little every day - any time you walk past the tractor kind of thing.

It'll eventually come free.
 
The neighbor had his Allis Chalmers get stuck after siting for a couple of years. Had been over hauled and is in a shed. Just not used enough. A few squirts of ATF with the plugs out. Now here is the difference. They tried the rocking trick and it didn't work. Tried towing it down the street in forward and tow reverse. No luck with that. I walked over from after work and asked if he had compression tester hose. We screwed the hose into the cylinders one at a time and just blew some breath in it till you found the compression cylinder. Screw on an air chuck and hook air to it. POP and the engine came loose. I don't know if she just needed a little more or what but it worked. On the farm many years ago I took and old spark plug and broke out the center. brazed an air fitting to it and did the same on a neighbors tractor. IF YOU HAVEN"T TRIED IT.... don't say it will not work. Air at 150 psi can do some work. I double dog dare you.
 
A lot depends in why it is stuck. If it has or had water in the cylinders you need to get all the water out and then maybe it will free up. Once the cylinders are dry fill them with ATF and put the plugs back in the keep dirt etc out. Wait a week or so then pull the plugs and try to spin it over with the starter. Most of the tractor I have gotten in where stuck and that is how I freed them up
 
(quoted from post at 19:47:14 02/02/16) Not trying to hijack the thread, but how do you keep the ATF and Acetone from separating?
Click to expand...
Your objective is to make the ATF super thin. Acetone will evaporate within a few seconds, leaving the thickened back ATF.
Separation has never been a concern because I mix and use.
In a pinch, I have used lacquer Thinner.
 
It has been sitting outside but no reason for water to have entered the cylinders. The ground is soft so I can't rock it to speak of. I will try not to be too aggressive and give the ATF time to work before go further. Thanks to you and all the guys who responded.
 
(quoted from post at 22:28:27 02/02/16) It has been sitting outside but no reason for water to have entered the cylinders. The ground is soft so I can't rock it to speak of. I will try not to be too aggressive and give the ATF time to work before go further. Thanks to you and all the guys who responded.
Click to expand...
Using the starter is much easier then rocking but I use starter as last resort.
After all, starters are designed to spin a free engine, not a locked up one.
 
The starter is still the best way to try to spin it over. Short fast taps on the starter button to make it hit but not stay locking in long enough to hurt the starter.
 
(quoted from post at 10:48:56 02/02/16) i have to disagree with the statement that you can't damage the engine with the plugs out, if it comes loose and the cylinder is full of oil you would have a real hydraulic effect trying to get all the oil out that small hole as the piston came up, could well bend a rod or break a piston
Click to expand...

Not an issue. More likely to wreck valve train with a stuck valve .
 
Someone said to jack up one rear wheel and put it in gear and try to turn the wheel back and forth without getting crazy after the
concoction is put into the cylinders. I have done that but my question is how hard should it be turn the wheel that is jacked up? I will
let it set a few days and try again. Thanks
 
Someone said to jack up one rear wheel and put it in gear and try to turn the wheel back and forth without getting crazy after the
concoction is put into the cylinders. I have done that but my question is how hard should it be turn the wheel that is jacked up? I will
let it set a few days and try again. Thanks
 
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