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Check your shaft zinc. A worn zinc can cause the shaft to be unbalanced and vibrate especially at high rpm.

The rudder, sand shoe and prop are all bronze. The sand shoe needs to be removed in order to remove the rudder. I believe the shoe is a guide for the rudder and not a support.

I have a 2007 pilot which had vibration/ cavitation issues. The issue was solved with a clean bottom, nicely painted prop and intact shaft zinc.

Does anyone know if the Pilot hulls are solid glass or cored?

I also have a 2007 pilot I have pulled the clevis pins and the seats slide off. My rails and pins seem to have been greased by the previous owner, but some wd40 should help if they are difficult to remove.

Thanks for your response to the survey My issue seems also to be somewhat better with a very clean bottom. It was not noticeable for the first 8 months after I purchased the boat and during the initial sea trial. I have the bottom cleaned monthly by a diver. Some time helps sometimes not so...

The issue is for the shank to clear the windless. I found the Ronca Vulcan 12 fits perfectly. Although I understand larger is better, it still needs to fit.

I have posted this on the Yahoo site also As the issue of vibration and or cavitation seems to be restricted to the Pilot 34 with single diesel it would be interesting and helpful if pilot owners listed the following info for a comparison survey; 1 prop diameter and pitch 2 original or new...

I have a 2007 pilot 34. I have replaced the original Bruce anchor with a Ronca Vulcan 12 that perfectly fits in the bow roller, any larger will probably not clear the windlass

Thanks for the picture it really helps to understand how they are installed

Thanks all for the help I will give it another try

Thanks I guess I have to be a little more aggressive, was afraid of damaging the headliner

I tried twisting pulling, inserting shims nothing seems to work. When you removed from the 30 hardtop did you notice the structure that the fixture was set into. Is it wood or solid fiberglass?

Has anyone removed the light fixtures from the hardtop ceiling? There are for screws which I removed but still can not budge. I inserted plastic putty between the headliner and fixture but still no luck. Has anyone removed them. I would like to replace the bulb over the helm from the white to red.

Does anyone know how to remove the lights in the pilot hardtop There are four screws. After removing the screws still does not come out. Tried pulling and twisting still nothing.?.?

Before you spend several thousand dollars on a five blade prop make sure your original prop is balanced and does not have any dings. Also make sure your shaft zinc is tight and not terribly worn. Any of these issues could sound like cavitation.

The zinc is placed about 1/2 way between the bearing and prop. Wonder if it would be better closer to bearing or prop?

Mystery vibration issue solved. Sometimes the simple things are overlooked Had my diver come and thoroughly clean bottom and check the shaft, prop and bearing. All was good except the zinc was gone. Installed a new shaft zinc. Ran the boat and it ran perfectly no vibration. So thinking the worn...

Thank you for the helpful responses Does anyone know how to tell if vibration is cavitation or mechanical issues. Do they sound or feel different?

David can you describe what cavitation sounds and feels like. Do you know what cup your prop is mine is 25R28 Lcup tip. Do you have the same original factory installed prop?

The engine idles smoothly in neutral at all rpm. The vibration seems to begin at high rpm while underway. It is most pronounced at about 2800rpm. It is intermittent varying from no vibration to a loud rumbling that can be heard and felt. I purchased the boat in June of 2016, she was perfect at...

I have a 2007 Pilot34 was curious is any has had vibration issues and changed the prop from what I believe the original 25R28 Lcuptip to something else. If so did it help?

It is my understanding also that Marlow kept the basic hull of the pilot 30 and 34. However they made some engineering changes such as using a different prop to address vibration and cavation issues. Does anyone know of any such engineering changes that could be used to improve the performance...

In that this forum is called Marlow -Mainship are there actually any Marlow owners participating. If there are it would be helpful to get input regarding sharing technical differences and improvements.

When the weather clears I will run boat to see if the issue happens again