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Old 30 August 2015, 13:35   #1
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Yamaha F30 overheated :-(

Feck sake, finally got out on a calm day and engine overheated on the way home , wasn't on full throttle either, only 4000 revs when she started smoking out the top exhaust, couldn't Rev it over 1800, turned it off when the pee stream started to become spluttery,

Flushed it out since getting back and it started on the muffs first turn, pee stream strong as always

What do you think happened? Water pump? Or thermostat ?

Help :-(
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Old 30 August 2015, 13:47   #2
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Impeller key
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Old 30 August 2015, 13:58   #3
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Kelp or bag blocking the intake?

jky
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Old 30 August 2015, 15:47   #4
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I took the intake guards off and found nothing, there was a little bit of debris in the pee hole exit, but the pressure is good , if the thermostat doesn't open would that cause the overheating?
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Old 30 August 2015, 16:02   #5
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If the thermostat doesn't open yes it would overheat. I'd want the stat out and checked.
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Old 30 August 2015, 16:07   #6
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Ok, when it was getting serviced and a new timing belt the mechanic said he checked the thermostat !
Worse case how will I know if there's damage done?
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Old 30 August 2015, 16:16   #7
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Davie is a man of few words built on many years experience. I'd follow his pointer first.

As for long term damage compression testing and possibly a boroscope would help, but personally I'd want an expert to look at it.
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Old 30 August 2015, 16:39   #8
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Sorry just though - you tested on Muffs. I've never used muffs. Would there be water flow even if the impeller failed? If so then water flow means nothing.

Testing in a bucket would confirm that as if the paddles on the impeller are missing or the key has failed and the paddles are just spinning freely. BUT testing in a bucket with failure would result in potentially more damage...

Your mechanic who checked the thermostat presumably also checked the impeller?
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Old 30 August 2015, 17:01   #9
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I'll take off the lower unit tomorrow and see what the story is...

No confidence in the mechanic or the guy running the dealership

Looks like it's not my year , off the water for awhile :-(
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Old 30 August 2015, 17:43   #10
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Quote:
Originally Posted by ShinyShoe View Post
Sorry just though - you tested on Muffs. I've never used muffs. Would there be water flow even if the impeller failed? If so then water flow means nothing.

Testing in a bucket would confirm that as if the paddles on the impeller are missing or the key has failed and the paddles are just spinning freely. BUT testing in a bucket with failure would result in potentially more damage...

Your mechanic who checked the thermostat presumably also checked the impeller?
My Mercury doesn't put water out of the tell-tale with just a hosepipe connected to the muffs unless the engine's running. Turn the engine off & the telltale stops.
Check the stat.
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