Freeing a stuck engine
(New page: Some points to remember BEFORE you start Before you get out the sledge hammer and the block of wood and start pounding away, there are a few things to consider. One of the first thing...) |
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Before you get out the sledge hammer and the block of wood and start pounding away, there are a few things to consider. One of the first things to consider is how long has it been since the engine was lasted turned over? and, Secondly, what was the condition the engine was left in when last turned over. | Before you get out the sledge hammer and the block of wood and start pounding away, there are a few things to consider. One of the first things to consider is how long has it been since the engine was lasted turned over? and, Secondly, what was the condition the engine was left in when last turned over. | ||
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Open the rad cap and check for coolant. If none is present in the upper tank, open the drain tap and check for the presence of antifreeze. You can remove a upper rad hose housing and check under the thermostat too. In some cases, you can open a engine block tap or remove a water jacket stud to look for coolant too. | Open the rad cap and check for coolant. If none is present in the upper tank, open the drain tap and check for the presence of antifreeze. You can remove a upper rad hose housing and check under the thermostat too. In some cases, you can open a engine block tap or remove a water jacket stud to look for coolant too. | ||
| − | The reason why you are looking for the presence of water is this. If the reason for the engine being stuck is caused by external or internal water damage this could alter your decision to use this engine. By this I mean, if the water is from an external source such as rain and it came into the air cleaner via the butterfly stud on the | + | The reason why you are looking for the presence of water is this. If the reason for the engine being stuck is caused by external or internal water damage this could alter your decision to use this engine. By this I mean, if the water is from an external source such as rain and it came into the air cleaner via the butterfly stud on the air cleaner, chances are there is only a small quantity in only a few of the engine bores. You can only have so many intake valves open at one time and the water would have only migrated into those cylinder bores, therefore, you could only have two or three stuck pistons at best and not all eight. Chances of freeing the engine is much better. On the other hand, it the engine had been flooded by rising flood waters, there is a chance that besides intake valves being open, the exhaust valves open too. To make matters worse, water also entered in the oil breather and is present in the oil pan. Flood waters also have a large presence of clay particles (or silt), chemicals of unknown nature, and varying ph (acidity or alkalinity ). |
The reason why flood water is the worst to deal with is this. The clay or silt particles will puddle out deep inside of the engine and hang on to the rough casting surfaces of all the internal workings. These clay particles are so minute, that when they are in solution they will infiltrate a bearing. When the water being to dry they will form a layer of dust within the bearing. The dust will wick up the oil from the surface and water vapor from the air will start to rust the steel surface over time. The dust will also have acids and alkalines (caustics)attached to it and together with water vapor will etch the bearing surfaces. | The reason why flood water is the worst to deal with is this. The clay or silt particles will puddle out deep inside of the engine and hang on to the rough casting surfaces of all the internal workings. These clay particles are so minute, that when they are in solution they will infiltrate a bearing. When the water being to dry they will form a layer of dust within the bearing. The dust will wick up the oil from the surface and water vapor from the air will start to rust the steel surface over time. The dust will also have acids and alkalines (caustics)attached to it and together with water vapor will etch the bearing surfaces. | ||
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[[2. Understanding and Preparation]] | [[2. Understanding and Preparation]] | ||
| − | What you discovered above will lead you to understanding the solution to unsticking the engine. An engine that was in a covered shed, had no visible sign of water infiltration, was full of oil and coolant but stuck, is usually an easy fix. The rings which are cast iron are stuck to the cast cylinder walls but only in the cylinders which are open to the atmosphere. If you followed the firing order of the engine, you could determine which are open cylinders and which are closed. For arguments sake, why don't we take note of that for future reference when we open the engine up. | + | What you discovered above will lead you to understanding the solution to unsticking the engine. An engine that was in a covered shed, had no visible sign of water infiltration, was full of oil and coolant but stuck, is usually an easy fix. The rings which are cast iron are stuck to the cast cylinder walls but only in the cylinders which are open to the atmosphere. If you followed the firing order of the engine, you could determine which are open cylinders and which are closed. For arguments sake, why don't we take note of that for future reference when we open the engine up. I would start by pulling the spark plugs out to relieve any compression in the cylinders. Put some diesel fuel into each cylinder with a trigger type oil can. Use a least an ounce in each hole and allow to sit for a few hours. While that's working, back off on the fan belts, remove the air cleaner and valve covers. Charge up the battery, clean the cables and make sure all electrical connections are tight. Remove the fan shroud if there is one. Get a 3 foot breaker bar with a 3/4" drive and the appropriate socket for the front pulley bolt. Remove the coil wire from the distributor/coil. Find two friends and explain what you are about to do and what each one has to look for or do. |
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| + | [[3. Breaking It Loose]] | ||
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| + | With the spark plugs out of the engine and a FULLY charged battery give the starter a one second click and then stop. Observe as you do this if the fan or crank pulley has moved slightly and which way it moved, if the valves have moved, if the starter is fully engaging into the flywheel. Take the breaker bar and turn the crank pulley back a nudge and then his the starter button again to put some torque on the flywheel. This torque multiplication will move the crank journal a degree or two and will push or pull on the piston which in turn will apply thrust against the rings. All you have to do for the moment is crack the rings loose a thousandth of an inch to allow the diesel fuel to get in to that cavity. After allowing the diesel to settle in for a few minutes use the breaker bar to remove the tension on the ring. The diesel fuel between the ring and the wall will act as a fulcrum and break the ring free from the cylinder wall. It may take a dozen or so tries before all of the stuck rings and bearing are free but with each successive try more fluid will fill the voids until the engine is free to turn. Allow the engine to make two or three revolutions before stopping the exercise. This will allow the excess diesel fuel to evacuate itself from the combustion chambers and for some of the oil in the crankcase to move in the system. The engine will now have a new place to rest while the lubrication seeps into the surfaces of the internals. | ||
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