mercury 5.7 alpha one knocking noise in drive

jhb

Cadet
Joined
Apr 6, 2008
Messages
12
Loud knocking noise at 2200 RPM, no noise in idle or up to 2200 RPM. Neutral up to 4400 RPM no noise, oil pressure steady and all other gauges good. Any ideals? I have been to the shop over this twice now changed hub all lower gaskets no luck, then Gimbal Ring, upper shaft, shift cables, steering levers, ect.. currently at 4 weeks in shop and $4000.00. Picked it up Saturday took to the lake same noise, and now back at the shop? Any ideas or suggestions would be very appreciated.
thanks, John
 
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