Q. What Is A Cylinder Liner Protection Ring & What Is Its Purpose?
Ans: The Cylinder Liner Protection Ring Is Located At The Top Of The Liner And Its Existence Purpose Is To Protect The Liner From Thermal And Mechanical Fatigue From Combustion.
Q. Why Sometimes It Causes Problem In The Turning Of Engine?
Ans: When Engine Stopped For Long Time, Carbon Compound Which Adhered To Protection Ring And Piston Top Rand, With Absorbing Moisture, Is Swollen And The Piston Which Is In Top Position Sticks To Protection Ring, Eventually Causes Engine Turning (or Engine Starting) Impossible. So, If Engine Is ST/BY For Long Period, A Hand Turning To Be Done Every Alternate Day, While Blow Through Once Per Week.
Q. What Is The Reason Of Such Deposits On The Protection Ring?
Ans: Deposit Of Combustion Residue Due To Using Nonflammable Fuel And Low Load Operation Is The Reason, But Abrasion Of Protection Ring Which Invalidates Its Function Of Raking Out Carbon Compound Is Regarded As One Of The Reason. Using Protection Ring Which Exceeds Abrasion Limitation Might Cause Stick By Combustion Residue. In Every Maintenance, Practice Protection Ring Measurement And If It Exceeds Limitation Of Abrasion, Replace With A New One.
Q. How To Take Out A Stuck Protection Ring?
Ans: Sometimes The Protection Ring Does Not Get Easily Extracted, Due To Excessive Carbon Deposits And The Extracting Implement Gets Damaged During This Effort. In This Case, The Solution Lies In Punching The Protection Ring (at The Slots – See Photo Below) Upwards (PRIOR Using The Extracting Implement) Using A Pin Punch, Then Punch The Protection Ring Top Peripheral Surface With A Plastic Hammer And After Use The Extracting Implement.
