[C320-list] Yanmar 3GM issues

[Jack Brennan]

Wouldn't turn over or wouldn't start?

If it wouldn't turn over, it's probably electrical. Dead or low battery. A bad electrical connection or blown fuse somewhere.

Start by using a multimeter to check the voltages on your battery bank. Should be 12.3 volts or above.

Then try to start the engine. If the voltage plunges and doesn't come back, it's the batteries.

If that's OK, use a screwdriver to remove the gauge panel at the helm. Use the multimeter to measure the voltage at the start button.

If you get no volts, work your way backwards. There is an electrical connection, I think, inside the housing box in the aft cabin.

>From there, it goes back to the engine. Trust Calder on this, not my memory.

I believe the Yanmar wiring harness has a fuse in it.

Jack Brennan
Sonas, 1988 Catalina 320
Tierra Verde, Fl.





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-------- Original message --------
From: Louis Friedman via C320-list <c320-list at lists.catalina320.com>
Date: 7/14/24 4:52 PM (GMT-05:00)
To: C320-List at catalina320.com
Cc: Louis Friedman <loualfr at gmail.com>
Subject: [C320-list] Yanmar 3GM issues

Hi all, looking for thoughts here- went out for a sail today -engine took a lot of priming to start but then was fine. After 2 hrs sailing it wouldn’t turnover despite more priming. Had to sail it into the mooring.  Someone suggested  maybe a fuel line clog or I need to change the primary fuel filter? Both fuel filters were changed upon launching in May- would it make sense to change again ?  Picked up Nigel Calders book on diesels but still learning.

Lou
S/v Miss Adventure
#623
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