U.M.R. Engines

RINGS - SEIZED

Piston crown damage from a foreign body entering the combustion chamber can cause distortion of the ring groove and seizure of the compression rings in the ring groove. (Always remove the piston and check for this condition when carrying out this repair.

Don't assume that minor crown damage will not cause a more serious problem) Incorrect rings fitted (excessive wall pressure or insufficient back clearance) will cause excessive contact pressure and welding of ring material to the cylinder wall, complete breakdown of lubrication with rings totally seized or compacted in piston ring grooves. Excessive overheating and insufficient lubrication will contribute to this condition.

Compression rings can seize in piston ring groove when excessive oil useage produces excessive carbon which builds up above top ring and in the ring grooves. This problem is a secondry result and is not the primary failure. Possible worn valve guide or seal failure could be the reason for oil burning. If a engine is driven considerable miles with glazed up cylinders, the carbon build up will eventually seize the rings in the pistons grooves.

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