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Old 27 September 2014, 06:28   #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, 12:38   #2
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OK
it should read water in oil
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Old 27 September 2014, 14:10   #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, 15:34   #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, 17:36   #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, 14:34   #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, 06:57   #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, 12:42   #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, 15:37   #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, 15:38   #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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Old 30 September 2014, 15:40   #11
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Quote:
Originally Posted by Davie View Post
I think you have a problem elsewhere. The head gasket leaking into the water jacket doesn't explain water in the sump.
Agree... Hence

Before you put it all back together be sure to check the oil pan and oil pan gasket. The pan on 115 like to rust out/fail and its a bear to access. Leads to lots of salt water in the oil and a rapidly ruined engine. Its a known issue with the Yam115, locally I know of several people having it.
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Old 30 September 2014, 17:08   #12
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Quote:
Originally Posted by spartacus View Post
.
Looks like you've a broken bolt there too. .
Where ?
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Old 01 October 2014, 01:34   #13
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Quote:
Originally Posted by Ribochet View Post
Where ?
Thought it was in the third picture bottom right, but looks just like light reflecting.

Speaking of corroded oil sumps, wasn't there a thread a couple of years back on a Honda?
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Old 01 October 2014, 16:45   #14
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Those yam f100 have a common fault of corroded sumps! I have seen lots and it's a very expensive repair. I would want to have a look at the sump.
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Old 04 October 2014, 10:28   #15
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Here's the plan. ( head skimmed 7thou taken off will post pictures tomorrow.) Will fit head back on.going to measure old head bolts and check for stretching they should be ok as they are in an alloy block if there is any stretch then I will replace them. Not going to worry about the sump just yet. The head gasket was shot someone else had replaced the head gasket before when I bought the engine it had 510 hours on it and it has 750 on it know not the (650 is a mistake) I suspect an over heat, think they just fitted a new gasket and punted it on without checking for damage .Not fazed any more about working on these outboards. Let's face it I have saved a fortune so far by dismantling it myself . Human built human fixed.just take your time . Had the head skimmed at autohead Inverness charged 35 the guy there said they had done a few outboards
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Old 05 October 2014, 11:08   #16
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Old 05 October 2014, 11:37   #17
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That looks a lot better - lovely jubbly
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Old 03 May 2015, 17:04   #18
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F115

Water in oil . Engine flushed head skimmed, new head gasket fitted head back on .went on holiday (oct) did not test until last week .Pleased to say that after running her for 6 hours. I can confirm that it was just the head gasket that was the fault. total time 4 hrs total expense 150 new oil, head skimmed ,head gasket. new timing belt.
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Old 04 May 2015, 01:30   #19
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Good news. Nice to see you're back on the water.
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