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03-24-2013, 04:06 AM #1New Member
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Twin Veardo 300 (2009)- Different engine temp.
Hi guys,
I have a boat with twin 300 Verados and I am experiencing a very odd situation.
I start up both engines at a temp of 75F (ambient temp). after a few minutes one engine starts raising the temp leading to running temp whilst the other only varies with a few degrees. After around 5 mis the temp are as follows: 80F port engine / 140F starboard engine).
I checked the engine manually and the port side engine is as cold as when originally started whilst the other feel a lot warmer, so the readings and sensors are reading properly.
Another thing I noticed is that the port engine is idling at 600-650 rpm whilst the port goes down to 550.
I am suspecting 2 things, either a stuck open thermostat or else a thorn poppet valve.
I wanted to ask if anyone has experienced something similar.
Thanks for your assistance.
John
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03-25-2013, 06:23 AM #2
Remove the thermostat and clean it out.. I'm sure it has a few pebbles stuck in it.
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03-25-2013, 07:05 AM #3
I would start by replacing tstat
21 SuperBoat VF200 Yamaha SHO
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03-26-2013, 05:06 PM #4New Member
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Thanks a lot guys. I will check the thermostats out next Saturday and post back the findings.
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04-14-2013, 11:30 PM #5New Member
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Hi again guys,
You were both right, one of the thermostats was found stuck wide open. No wonder the engine was not managing to reach running temperature.
No pebbles though. I checked on boats.net and the replacement part comes complete. Can I find the inner part on its own or do I need to buy the complete assembly?
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04-15-2013, 06:43 AM #6
Whole assembly..... this has happened to me twice. One time found a shell holding it open. Other time was just bad....
Cawley