Winding sound at full throttle

Godfirst

Petty Officer 1st Class
Joined
Aug 11, 2008
Messages
228
Had the drive unit rebulit and new prop I here a winding sound at full throttle what could this be... merc 5.7 and a alpha 1
 

ErieRon

Chief Petty Officer
Joined
May 5, 2009
Messages
463
Re: Winding sound at full throttle

Well, if it's a "winding" noise...did you leave one of your rods in the water? :D

Sorry, couldn't resist.

If I just had my drive rebuilt, and it was whining at high RPM, I would take it straight back to where it was rebuilt. It could be just about anything from the coupler to the prop shaft and anything in between.
 

Texasmark

Supreme Mariner
Joined
Dec 20, 2005
Messages
14,780
Re: Winding sound at full throttle

When people say "rebuilt" you need to know what exactly they are referring to. Rebuild jobs range from A to Z with parts, cost containment, and mechanic expertise. Personally I will take an OEM in advanced years, well cared for, before even considering a rebuilt. BTDT on both ends consuming and rebuilding!!!!

My personal opinion on your situation is that you have a new gear against an old one; one was replaced and the other wasn't. The old one is "worn in" against the gear it was driving or was driven from; hence the contact surface has a "memory" to it and is not uniform. The new gear has no wear marks so as the worn gear rides on it you get this noise.....quiet spiral gears are one of the mechanical world's marvels, I absolutely assure you. They are absolutely, with a doubt, the marvels of the industrial society in which we live.

So, with that said,if you have some warranty available, work the psayazides out of it before the warranty expires and if you don't wear it in where it quiets down, take it back for a rework.

Mark
 

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: Winding sound at full throttle

Had one myself. Many Alpha and pre Alpha drives whine. It's just the nature of some of them. I had one years ago that I took apart 3 times and checked to see what was wrong, all was perfect.
 

Godfirst

Petty Officer 1st Class
Joined
Aug 11, 2008
Messages
228
Re: Winding sound at full throttle

Thanks for the imput, just heard a different sound then usual well someday will do all the work myself when I have the time.
 
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