Drive Noise

[milan]

I'm new to owning a boat with a power plant like this. 2002 6.2L merc bravo 1 drive 150 hr on clock. Is it normal to hear a detectable amount of u-joint/drive noise when revving the motor in neutral on muffs in the driveway?

 

[boat127]

Re: Drive Noise

you shouldnt be revving it in your driveway and in neutral not past 2000 rpms
do you have muffs hooked up
and no you shouldnt hear any drive noise
is the drive down when you are doing this

 

[milan]

Re: Drive Noise

sorry for the slow reply,kids. Not revving too high and yes with muffs. I hear a little nocking. drive is down.

 

[boat127]

Re: Drive Noise

has the drive been off lately?
if not i would jsut pull the drive and inspect the u joints and gimbal bearing
not a bad idea to change the gear oil to

 

[milan]

Re: Drive Noise

I had the drive off to replace the shift bellows. I also replaced the drive shaft bellows although it looked good. I greased the u-joints and the gimbal bearing. They both seemed good. It doesn't sound any different than before I did the work. I just don't know what the normal sounds are.

 

[Lupus]

Re: Drive Noise

Hi,
I have a Penta DP-SM and it also has a slight noise in neutral and with the steering straight forward. Has always been like that. As soon as I turn the steering (in neutral) or apply power to the drive the sound goes away. I have checked gimbal bearing and U-joint without any failure and it is lubricated every year. I guess it is just a "construction thing". Of course the sound can be loud or worse that what I have and then of course there may be a problem to be solved. Anyway if it is only very minor should be nothing to worry about. Happy boating!