Q: What is the proper procedure to break in an IO-540-AB1A5 that I own on a 1998 C182S?
We pulled and replaced the compression and oil control rings on cylinders 2 and 4. The rest of the cylinders were untouched.
Where can I find Lycoming recommendations for a replacement of rings like we are about to complete? I do not have an engine owners manual, nor does my A&P mechanic.
Hugo Quintana, Ocean Springs, Miss.
A: Hugo, I must assume that the cylinders were removed for low compression according to the information you provided.
Any time a cylinder or cylinders are removed from the engine for any reason, it is just good shop practice to hone the cylinders and install all new piston rings.
Lycoming Service Instruction 1427B or its latest revision should be referred to to assure proper engine break-in is completed.
The information provided in this publication is extremely important in order to assure the engine is broken in properly, resulting in future safe reliable service. Not following these important directions can lead to high oil consumption and costly future maintenance, which no one needs these days.
I’d like to suggest that you consider purchasing an Engine Operator’s Manual for your engine, which will provide you with specific information for your particular engine.
This publication may be ordered directly from Lycoming Engines or through the Lycoming Distributor of your choice.
Thanks for taking time to read General Aviation News and submitting your question which hopefully, with my response, will also help someone else.