I started to have some issues a couple of flights ago. When climbing I'm getting some more intense vibrations than usual. Probably to anyone else that hasn't flown in it as much as me wouldn't notice it but on my most recent flight its started to get rougher on climb.
And simultaneously I started having issues in cruise. In cruise I can have my power set and will have some RPM wandering. I usually cruise at 17" MP and 2400 RPM and about 50 degF rich of peak. The plane will vibrate while at 2400 RPM. It's just a slightly stronger vibration than standard but after about 3 seconds the RPM will increase about ~25-50 RPM (hard to tell on my old dial gauges) and the vibration will smooth out. After another 3 or so seconds the RPM will settle back down to 2400 RPM and begin to vibrate again. Cycle keeps repeating.
My prop hub was leaking grease when I took it in for my annual end of last year and they did a reseal on my prop hub. I then took it back to Maxwell a couple of weeks ago when I started to have these issues and one of my blades was slightly loose. They send it back to the prop shop and they warrantied the issue and tightened things up but I'm still having the same vibration problems.
Sounds like maybe a governor issue? I've only owned the plane a year and a half so I'm still learning a lot. It's been really frustrating trying to schedule check rides with no DPE's available and having to send my plane back and forth to the shop.
Any advice would be really helpful. Planning to take the plane back to Maxwell this week for them to look at it agian.