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Do I really need to remove carbon and adjust valves on my Onan P218
Steffen_Brandt posted a topic in Engines
Hi everyone So heres the deal. I bought my 518 H back in 2012. At the time it had 2000 hours+ on the clock. Today it has 2180 hours on the clock. The maintenance schedule says, that I have to remove carbon from the heads every 1000 hours. So not knowing if the PO owners have done this, I think it is time to do something about it and at the same time adjust the valve clearence.The engine is running okay, so I thought I would start by cheking the compression of each cylinder. Each cylinder reads 125 PSI. My manual says 115 PSI. How should I react to this? Does it mean that the valves are seating just fine? Does the higher (than 115 PSI) compression mean, that there are carbon deposist, making the volume in the cylinder smaller, thereby increasing the pressure? Is my engine just okay, and there is no reason to take it apart to adjust the valves and remove carbon? Thanks!