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The term "o-ring" usually is in reference to some sort of rubber or neoprene ring that serves as a gasket or seal for something. Pistons do not have o-rings, but they do have piston rings. There are usually three or more rings on each piston. They are split rings of steel that are inserted into grooves of the outer circumference of the piston. They seal the piston to the cylinder walls and prevent the air/fuel mix from getting past the piston into the crankcase and prevents the crankcase oil from being sucked into the cylinders. With the pistons rings, the cylinders would not have sufficient compression to do their job effectively. Rings can and do break from time to time. This can cause degradation of performance or in the worst-case scenarios, serious cylinder damage.
Check for fuel, spark, and then compression. Fuel problems can be pump, pump relay, fuse, filter, line, etc. Spark problems can be distributor module, distributor, coil packs, power to distributor or coil packs, plug wires. Compression problems would be piston rings, piston walls, piston rods.
Hello, You can still have Ring issues with good compression. The pistons have different types of rings on them to do different jobs. The top rings are your power rings, the bottom rings are your oil rings.
The oil rings prevent the block pressure and oil slop from being drawn up into the cylinder. The piston creates a siphon action and the oil rings prevent the oil from climbing the cylinder walls. All it takes is for the rings to rotate around the piston and have the ring ends line up.
That is why you offset the rings on installation from 90 to 120 degrees. It staggers the gaps of the rings for a better seal. Now you can get oil vapor if the compression rings line up to allow compression into the crankcase through the gaps on the piston rings.
Sometimes the valve stem seals can leak and allow exhaust into the upper block if you have valves that are not seating correctly.
Yes it could be from damage in the piston rings but the ring damage would have to be sever for this to happen(Rough running engine or missfire) You can check for bad piston rings by doing a compression check of the supsected bad cylinder or cylinders.I belive autozone rents this tool out. Another possibility is bad seals in your valves, during compression stroke the air fule mix could be leaving thro a bad seal in one of your valves. due to the compexity of this test i recomend you have your valve seals check by a shop.
The most common cause of your problem would be a sticking or burnt valve the only way to know for sure is to remove the head and check then it will need a valve grind and head machined before replacing you may find it cheaper to hunt around for a good secondhand engine to have fitted in your car.
The head of the piston in each cylinder is designed to compress fuel so that it is combustible (explosive/flamable) when it is ignited by the spark plug. The compression is maintained by O-rings on the piston which do not allow fuel to escape past it. In your case, either an O-ring is damaged or the piston itself isn't working properly and it is not compressing the fuel as it should.
Hope this helps, best regards :)
So whats your question?. Could be pleanty things but will be costly. No compression means piston rings are most likely the cause. Worst case the piston is fried too but usully no compression is bad rings or valva sticking open not allowing the cyclinder to compress air/fuel mix
They use throw away bolts. One use only, so don't reuse your old ones. You will need new ones. The smaller bolts 1st torque setting 22Ft/Lbs and the larger 26ft/lbs, the 2nd torque setting 60 degrees both bolt sizes and the 60 degrees for the third.