Amar Nanduri

Newbie to Props. Question on a 255 SSI

7 posts in this topic

Hi Everyone.

      I am in the market to purchase a chaparral and took a 255 SSI for a test drive. I heard a knocking sound (like a single knock that was felt throughout the boat) when the Chaparral is put in reverse when docking the boat. The dealer told me that the noise is common as the propellers stop first before they rotate in reverse. Is this correct? The exhaust manifolds have not been replaced and have been there since the boat was new. The engine has low hours ( less than 150 hours ). Are there any other things I need to look out for before I commit to the purchase? Things to look out for. The boat is 11 years old. My only experience with boats is the yamaha inboard jetboats and this is the first time I am venturing into the propeller world. I would truly appreciate some help and advise in this regard.

 

Best Regards

Amar..

Edited by Amar Nanduri
title change

Share this post


Link to post
Share on other sites

Hi. It is a cuddy cabin with a 320 hp engine. I think it is a mercury. It is in brackish water with less than an hour from the salt water. So I am sure that it was used in salt water. The bottom has been painted twice and it is put in a slip most of the time. Thanks. 

Share this post


Link to post
Share on other sites

No knock on my outdrive. Something is not right if you hear/feel a clunk.

brick

Share this post


Link to post
Share on other sites

Sure that the prop must stop before changing the direction of its revolution. Other than that all else is subjective ...

How quickly was one switching from F to R? Too fast ... Clunk!

Were the engine idle RPMs as prescribed, 600-700 RPM? The shaft inside the drive is constantly moving, so too high idle RPMs ... Clunk!

Last but not the least ... there is always a clunk when switching the gear, Merc or VP. It could be a faint one or a more pronounced clunk ... and this is the most subjective aspect. You might want somebody who knows the I/O boats to look and listen to get a second opinion on this.

Share this post


Link to post
Share on other sites

Thank you everyone for your input. Gave me a better understanding. Richard you mentioned about engine idle rpm as 600-700 rpm. Are there any other boundary conditions I need to look for? During the test drive the boat made a respectable 40mph . I ask d the dealer for another test drive but this time I will bring a mechanic for inspection. 

The boat was in a slip most of the months in a year except when pulled out at end of year when it is winterized. Is this a concern? My apologies as I typically pull my Yamaha jetboat every evening out of the water and onto the trailer when I take it out. 

 

Best

Amar

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now