Twin Disc emergency mode

[Mac2]

I’ve spent years trying to find information about freewheeling my TD MG5061 transmissions. On a recent post a member posted about come-home screws that allow the transmission to be locked in gear in case of lost hydraulic pressure. This led to me finding a owners manaual that finally talks about “windmilling” if the engine shuts down. It gives 3 methods, but you only need one. It will depend on weather the engine is running or not. Incidentally some owners manuals do not have this section.

 

[Mac2]

Forgot this page

 

[Mischief Managed]

That's a neat feature but I just wrap a line around my prop shaft in the engine room and tie it off to prevent windmilling. It takes a few seconds and it's really easy if the shaft is already turning slowly.

When I'm anchored, moored, or docked an an area with strong current, I wrap the line around both shafts in the engine room and let them stop each other from spinning. I also hang my ignition keys from the line in that situation so that I can't start the engines without going to the engine room first to get the keys (and remove the line).

 

[Mac2]

I was more interested in shutting down one engine so as not to underload both engines while running at low rpms. In my case I would only need to start the engine if run for more than 8 hours. Then I would only need to restart the engine and run for 5 minutes to restart the clock-can’t imagine doing this unless Im crossing an ocean.

 

[welippisch]

Hey guys, out of ignorance to this issue : Why and when would I want to prevent the propeller from free spinning?

 

[Mac2]

Engine failure. Tow. Etc. Some transmissions require the cooling loop from the engine (water or oil circulation) constantly or they overheat and get ruined/damaged. My twin disc will splash internal transmission oil around to protect parts when prop is freewheeling. It specifies 8 hours before having to start the engine-not sure why that is.