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Old 27 September 2014, 07:28   #1
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Yamaha F115 2004 650hrs oil in water

Anyone else come across this fault I know its the head gasket due too no/3 port having water on plug. Question is whats the chances of to just being a gasket fail or is it due to corrosion .has anyone had a good out come
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Old 27 September 2014, 13:38   #2
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OK
it should read water in oil
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Old 27 September 2014, 15:10   #3
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I take it engine had running issues before you found water in the oil?

You'll need to strip down and investigate further. If you've caught it in time hopefully the head doesn't have to be skimmed. What are the bores like?
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Old 27 September 2014, 16:34   #4
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Yep she was missing and was slow to pick up. I haven't striped it down yet I have flushed the milky oil out and turned her over with fresh oil . Going to pull the head tomorrow but I need advice can the cylinder head be remove from the block in situe or do I need to remove engine from leg.
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Old 27 September 2014, 18:36   #5
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Found the manual on Scribd.

Link here: Yamaha Outboard F115 Service Repair Manual
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Old 28 September 2014, 15:34   #6
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Thank you for your. help cheers Spartacus. Haven't pulled the head of yet. my heart sinks as I read all the forums dreading finding corrosion.
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Old 30 September 2014, 07:57   #7
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Click image for larger version

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ID:	99522 ok here is a picture of the head the block and head gadget . Any one want to comment
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Old 30 September 2014, 13:42   #8
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ID:	99528after showing the cylinder head to an engineer he recommend that I have the head skimmed. It is barely noticeable but it's enough to cause a problem. But looking on the bright side it looks like I will get a few more hours out of the old girl yet.
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Old 30 September 2014, 16:37   #9
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That first picture looks like a fair bit of salt build up. Agree with head skim, considering the cost of the new gaskets, new head bolts, etc. Check out the thermostat while you're at it. You can use a diluted vinegar solution to spray on, then clean out the head water-jacket so it's spotless. All traces of the old gasket need to be removed.

Lightly lube new head bolts (not Copperease) and tighten in sequence.

Looks like you've a broken bolt there too. Use a bolt extractor tool to remove.

650 hours... that's just run-in! Cheaper than replacing it.
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Old 30 September 2014, 16:38   #10
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I think you have a problem elsewhere. The head gasket leaking into the water jacket doesn't explain water in the sump.
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