Offshoreonly.com - Outdrive Knocking

Offshoreonly.com (https://www.offshoreonly.com/forums/)

- Drives and Lower Units (https://www.offshoreonly.com/forums/drives-lower-units-217/)

- - Outdrive Knocking (https://www.offshoreonly.com/forums/drives-lower-units/274860-outdrive-knocking.html)

williams6

04-20-2012 02:08 PM

Outdrive Knocking

I have a 5.7 350 Magnum Engine on an Alpha GenII Mercruiser outdrive. There is a knocking in the outdrive when going over 20 mph. There is no noise at all when going under 20 mph. Knocking is not in the engine. I checked the u joints and they were tight. There is no metal shavings in lower unit oil. Any ideas what could be the problem?

Thanks!

Powerquest_Baby!!

04-20-2012 03:02 PM

Something is loose and the torque at speed is causing the knocking...Are you sure its the outdrive? Could it be your flywheel? Bellhousing?

All times are GMT -5. The time now is 10:44 PM.