Piston engine problem Brisbane- SKIRT

SEIZURE OR PICK UP

Seized piston skirt is the most common engine problem that is evident when an engine is severely overheated, when the engine suffers a lubrication problem or the engine has a piston to bore clearance problem. Engine blocks are bored and honed to a specific size that the manufacturer of the piston designs to run quietly without piston slap when cold yet still maintains enough minimum clearance when at operating temperature to eliminate piston to bore seizures. Any changes in the normal lubrication qualities, abnormal loads, abnormal combustion temperatures and higher than normal coolant temperatures will subject the piston to possible seizure or partial seizure. The seizures can be identified into 3 main types of failures, four point pick up. centre point pick up and full skirt pick up. "Four point pick up" often occurs as a result of insufficient nominal piston to bore clearance after a rebore. Unfortunately a piston that may be running the recommended minimum piston to bore may suffer 4 point scuffing simply because the engine was subject to abnormal conditions. Over loading or changes to ignition timing, increased combustion temperatures and cooling system failures can be some of these abnormal conditions. "Centre skirt scuffing" ,usually more evident on the thrust side of the piston is usually the result of lubrication problems, incorrect engine oil, engine running moderately over temperature or dry assembly or start up. "Complete skirt seizure" is usually a result of driver fault. What happens commonly is that an engine suffers from any of the above causes and the driver feels a loss of power from the engine but continues to add more throttle as the vehicle slows down.. This extended and increased load takes the already minor piston pick up to the next level of complete seizure. This is where the piston and bore transfer material across to each component until complete seizure stops the engine running. Often severe damage occurs to other components and the heat generated can even transfer through the block and melt even external components like coils, leads, carburettors and any plastic component bolted to the engine. Disclaimer Agreement : Every care has been taken in writing this information and procedures, but no responsibility can be excepted for errors, omissions or misuse of this information and procedures. The information available on this site is for your instruction only and cannot be copied for sale, © copyright 2001 UMR Engines