Hi All,

Looking for ideas on how to narrow down my bad oil analysis.

Copper is very high and iron is high, It has been narrowed down to rocker bushings or  a valve guide. My plan is to remove the rocker box covers as soon as I get some new gaskets in case I mess one up.

If I can not isolate the jug with a "visual and poke" around inspection I am looking for alternatives.

All the temps and numbers are perfect, if it was not for the oil analysis I would have no idea that there was a  problem.

I am reluctant to rush into removing a jug as it would mean a break in.

Is there a way to change the rocker arm bushings without removing the jug???????  I have just borrowed a parts book for the io360 A and B series, so am not sure what the rockers look like for sure.

As you can tell,  I have never been into an aircraft engine.

I am planning a trip that will put 70 hours on the plane so would like to get this settled first. 

Any ideas would be welcome.

Thanks.

Ken Andrew

N377SB, '77 112B Hotshot, S/N 526