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Old 26 September 2014, 13:43   #1
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Yamaha 115hp V4 Oil pump fault

Other than the oil level dropping in the tank is there any other way to tell if the engine is pumping oil?

I heard it pumping yesterday but that was when I wasn't using the boat. Been on the boat today and noticed that the oil level hasn't dropped (if it has it is barely anything!

I used about 15ltrs of fuel today. The oil tank (10ltrs) was half full before I set off and is still about the same!

Any ideas anyone? cheers
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Old 26 September 2014, 13:56   #2
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Its not an unusual mod on the V6 Mercs to disable the oil injection (its actually more of a slow drip into the fuel line on the fuel tank side of the carbs) and then run it on a 50:1 premix.
Would it be worth you making a graduated dipstick or sticking something graduated on the oil tank?
Does the Yam have a low oil and oil pump warning?
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Old 26 September 2014, 14:04   #3
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I have marked the current fuel level with some tape on the outside of the tank. Only owned the boat about a month so the engine is all new to me!
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Old 26 September 2014, 14:39   #4
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Are the plugs oily looking ?
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Old 26 September 2014, 16:53   #5
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They do. Have warning systems on these

1 on main tank and another on the header tank , and if not pumping through the blender it will shut engine down to low rpm,

It will not have used much oil with that fuel used , pump only kicks in after header tank drops to just below lower mark on header , then fills it to half way before switching off again,

Simple test ,,,,,


Look on header tank under engine cowl, there is a ruber pipe on bottom remove it and catch the oil in some thing approx 1/2,pint,
Replace rubber pipe,,(this is a water trap) use new tye wrap,

Righto tank is now empty turn on ignition do not start 80 seconds it should fill to half way between the two arrows and switch it self off,, there ya go it works,,Hopefully,

If it does not, let me know will take you through what's a do,,,

Please note that they do not pump if engine is trimmed out a lot,,
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Old 26 September 2014, 17:07   #6
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It does bog down and sometimes cut out at low rpms when powering up. I can cure it by flicking the electric choke and it's fine again...
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Old 26 September 2014, 17:11   #7
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Quote:
Originally Posted by lukewhiting View Post
It does bog down and sometimes cut out at low rpms when powering up. I can cure it by flicking the electric choke and it's fine again...
Is it carbed or efi ?

I
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Old 27 September 2014, 00:56   #8
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Is it carbed or efi ? I
It was late

Can not believe I asked that derrrr efi have no choke it's auto

I would be stripping and cleaning the carbs ,, or at least chuck some fuel cleaner on the fuel line neat first then reconnect to tank after it's run through, then check see hoe it is
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Old 27 September 2014, 01:28   #9
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Check fuel filter for water also,, simply drain it off an roads
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Old 27 September 2014, 02:44   #10
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Haven't had chance to get to the boat yet but I have this photo of the engine. Is the tank in the photo the engine oil tank where it gets pumped in from the boat 10ltr tank? If the pumps not working that should be empty shouldn't it?

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