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Enigines out of sync then back in

GAS engine, transmission and generator repair and maintenance discussion forum.
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Topic author Canada
denders
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Enigines out of sync then back in

Postby denders » August 7th, 2016, 6:59 pm

Hi all - looking for a place to start with this one. We have a 1982 3396 Carver Mariner with twin 350 crusader engines. As we were coming back from a day trip all of a sudden the engine sync gauge would drift to the port side ( about 3/4 of the way ) then after a second or 2 it would come back to center. You could hear a difference in the engines so it shouldn't be just a gauge issue. This would happen every 10 or 15 minutes - The Tach's did not show a difference in RPM in either engine but given the sync was only off by a little I am not surprised. We were cruising around 7 / 7.5 knots. Any thoughts would be appreciated. As an addendum - We went out again and it the issue did not reoccur until we we out about 40 minutes or so.

Thanks in advance


Canada
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Re: Enigines out of sync then back in

Postby Viper » August 7th, 2016, 10:44 pm

If you could hear a difference in rpm in the engines, it should have been reflected in the tach readings. Sometimes poor connections will cause this symptom or a sync gage that is on it's way out.
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feeez
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Re: Enigines out of sync then back in

Postby feeez » August 8th, 2016, 10:17 am

My Sync guage seems to have a mind of its own. Since I have had the boat I have always used the tachs and the sound of the engines as my sync. Out of curiosity, where is that sync guage connected to at the the engine end?

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Re: Enigines out of sync then back in

Postby Viper » August 8th, 2016, 10:12 pm

They can get piggy-backed off the tachs

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