Metallic noises after impeller replacement (Mercruiser)

[NorthOfDallas]

Hey Iboats!<br />This past weekend, I replaced a worn impeller in my I/O. (1977 Glastron T179, 140 Merc/GM 3.0, with MR outdrive. SN: 4648535, also stamped: 1.98R)<br /><br />Everything went smooth until I decided to run it a bit again on the muffs again today (mostly to fell good about a job well done...) This time, I heard a metallic like chattering sound that I may have missed when doing the first driveway test. It sounded like it was coming from the lower area of the drive near the prop shaft. <br /><br />I also noticed the prop shaft was turning very slighty while the boat was in neutral. I checked that it went into forward and reverse properly, and it did. It behaved normally when doing that. In neutral, I stopped the prop with my foot with barely any resistance.<br /><br />Someone said on another post that I read that the shafts may have gotten bent during reinstallation. The shafts seem VERY stout and they went in without much forcing at all, so I am not sure that's it.<br /><br />I followed these instructions to replace the impeller.<br /> http://www.mercstuff.com/waterpumpinst.htm <br /><br />I have the Chiltons, but we all know how good those are [Roll Eyes] .<br /><br />Any ideas or am I being hyper-sensitive to noises that have always been there? <br /><br />thanks!<br />Corey

 

[tystick]

Re: Metallic noises after impeller replacement (Mercruiser)

it sounds like the coupler is not fully engaged with propeller in forward position causing it to turn slightly in neutral. <br />A metallic like chattering sound is never a good thing

 

[Don S]

Re: Metallic noises after impeller replacement (Mercruiser)

Could be the shifter is not fully into neutral. After so long those lower shift cables get worn out and corroded and just don't work anymore.<br />At that point, they need replaced before you loose your shifter and gears in the lower unit.

 

[NorthOfDallas]

Re: Metallic noises after impeller replacement (Mercruiser)

Don, <br />could I check it by sliding the shifter slightly into reverse or forward to see where the "neutral" really is?

 

[hullofalottatrouble]

Re: Metallic noises after impeller replacement (Mercruiser)

sounds like a shift cable problem to me as well.. you may very well get it to engage the prop in forward and reverse in the driveway but get it in the water and might find it doesnt do either.. or does one and not the other.. thats about how my shift cable acted when it went bad..