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Dec 30th, 2023
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 Over heat on Yamaha
#13297398
09/30/19 02:38 PM
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Joined: Nov 2015
Posts: 221
skeeterfan
OP
Outdoorsman
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OP
Outdoorsman
Joined: Nov 2015
Posts: 221 |
I have an Yamaha OX66 200 hp. The over heat alarm comes on when I idle for an extended time. It does not happen when I am running at higher rpm's for extended times. I recently had the impeller replaced but it still happens. Any ideas on what could be causing it ?
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Re: Over heat on Yamaha
[Re: skeeterfan]
#13297407
09/30/19 02:45 PM
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Joined: Nov 2007
Posts: 5,798
ssmith
TFF Celebrity
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TFF Celebrity
Joined: Nov 2007
Posts: 5,798 |
check the poppet valve see if its stuck or has a weak spring.
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Re: Over heat on Yamaha
[Re: skeeterfan]
#13297411
09/30/19 02:50 PM
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Joined: Oct 2008
Posts: 393
jackwabbit
Angler
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Angler
Joined: Oct 2008
Posts: 393 |
Change the poppit valve and the thermostat
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Re: Over heat on Yamaha
[Re: skeeterfan]
#13297418
09/30/19 03:05 PM
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Joined: Aug 2005
Posts: 92
Rooster-SG
Outdoorsman
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Outdoorsman
Joined: Aug 2005
Posts: 92 |
The damper seal (Rubber Gasket) between the exhaust outlet and the water impeller section causes this issues as well. This should have been changed when the impeller was changed, but not always done by most.
If the poppet valve is free then this is the issue.
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Re: Over heat on Yamaha
[Re: skeeterfan]
#13297434
09/30/19 03:28 PM
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Joined: Nov 2015
Posts: 221
skeeterfan
OP
Outdoorsman
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OP
Outdoorsman
Joined: Nov 2015
Posts: 221 |
Ok, thanks for the replies.
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Re: Over heat on Yamaha
[Re: skeeterfan]
#13297459
09/30/19 04:02 PM
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Joined: Jul 2013
Posts: 5,902
Bissett
TFF Celebrity
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TFF Celebrity
Joined: Jul 2013
Posts: 5,902 |
Make sure it's peeing water at idle. My last one was a 2001 225 ox66 and it would sometimes clog up with mud and would take a little bit to get it cleared out when that happened.
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Re: Over heat on Yamaha
[Re: skeeterfan]
#13297764
09/30/19 09:06 PM
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Joined: May 2013
Posts: 956
JoeFriday
Pro Angler
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Pro Angler
Joined: May 2013
Posts: 956 |
Had the same thing happen. Replaced the impeller, no change. Replaced impeller, housing, plate, gaskets, etc. Once all was new, water pressure came back to 5psi at idle and 25psi at WOT. Could be the poppet like suggested, but for me it was a complete redo of the impeller set-up to do the trick.
This space for rent
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