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ZF Hurth tranny noise need help.

Floatation Device

Contributing Member
Took a cruise a few weeks ago. Boat ran beautiful. Last night took boat our, strbd tranny made alot of very loud chattering in fwd. Shut engine down and idled with port engine. When getting home, I need both engines to dock, fired up strbd engine, put in gear, no noise and acted like normal. Probably idled for 1 to 2 hours. I know the shaft on the down engine rotates when idling due to water flow across the prop. When fired up, put engine in reverse, then in fwd. Any ideas what happening.
 
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