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Yes, one just has to be stronger than the other in order to provide a wearing effect on the other and get a proper seal and such. for instance you would never use chrome-plated rings in chrome-plated cylinders.
Only if you get the cylinders bored out to accept the larger rings.
Your piston rings and/or your cylinders are worn. Unburnt diesel will be blown past the rings into the sump.
It would be wise to replace the rings while you have it apart. Need to deglaze the cylinder walls and install a new set of STEEL Rings. Do not use CHROME RINGS because they will not seat. And it will use oil then. Why are you rebuilding the engine in the first place? If parts of the engine are worn it would be reasonable to assume that the rings and/or cylinders are also worn. To do it right, have the cylinders tested for "taper", that will show you how much wear the cylinders have experienced, and if there is much taper you'll need to bore the engine and replace the pistons/rings. Tapered cylinders mean that the rings will constantly be moving against the piston ring groves. Also, check the piston ring groves for wear. If the ring grove is excessive the pistons will fail soon and the money you put into the rebuild will be wasted. Personally, I would never rebuild an engine without AT LEAST replacing the rings, even if there is no appreciable cylinder taper, and experience suggests that it's not even a good idea to reuse pistons. Odds are against an engine lasting very long if you reuse pistons that have much use.
Burning excessive oil in the cylinders is the culprit. Scored cylinders and broken rings will usually contribute to blue smoke. Once it turns black, the engine is toast!
because the oil rings in those cylinders are worn.
bad rings most likely burnt valves i would also suspect a blown head gasket between those 2 cylinders
do you seriously think that theres a hole in the piston in all the cylinders? or the rings are gone in all the cylinders.. highly unlikely.. the main cause of loss of compression is the rings are burnt gone. the rings are stuck, the valves are stuck, hole in the piston and/or head, bent valves, or the timing chain/belt came off, or broke. with all the cylinders being down, i'd look into the last one. that's the only thing that would be logical to effect all the cylinders evenly.
Sign of bad rings or excessive fuel in cylinders. Check compression.
The pistons must be removed from the cylinders to replace the rings. Therefor, you must disconnect the rods from the crank. No options no alternatives period
Hydraulic cylinder use a liquid medium, often some type of viscous oil, in the cylinders and can be subject to higher pressures then pneumatic cylinders which use air or some other gas and work under a lower pressure.
Hydraulic cylinder use a liquid medium, often some type of viscous oil, in the cylinders and can be subject to higher pressures then pneumatic cylinders which use air or some other gas and work under a lower pressure.