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Old 15 December 2012, 14:24   #1
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Thickening of DFI oil?

One for the Mercury bods please.... Uncle Al / Black Dog /Opti owners

During the recent cold snap (launching at -4 degrees C) when starting the 150 Optimax first thing in the morning we sometimes get a symptom whereby the smartcraft shows the underhood oil reservoir below the 100% mark and dropping.... Lift hood, open resevoir briefly, allow oil to refill and all fine for the rest of the day.....until following mornings cold start (and def no leaks etc).

The oil feed seems good and the inline filter was replaced in case there was some restriction... It isn't really an issue, but has us puzzled. i assume the engine pulls through a lump of oil on start up....is it possible the oil is waxing up in the lines?

Launching in yest /today at 5 degrees.... no issue.

Any thoughts?
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Old 16 December 2012, 09:59   #2
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Not a slight leak in the pressure line allowing a minor air lock when left for a few hours?
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Old 16 December 2012, 14:29   #3
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Is the bottle actually low then when you open the cap?
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Old 16 December 2012, 16:07   #4
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Quote:
Originally Posted by Jizm View Post
Not a slight leak in the pressure line allowing a minor air lock when left for a few hours?
Possible, but no sign of lost oil, but then air could be getting in even if oil wasn't getting out I guess..... may end up changing the line out just in case.

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Is the bottle actually low then when you open the cap?
Yes, it has the air gap in the top of the tank, open cap and it refills as it should, then business as usual.... has only ioccured on v cold mornings though - coincidence?

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Old 17 December 2012, 15:53   #5
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Never heard of it happening, even when we took the boats on cold weather tests in Norway. Must be the Welsh extreme weather!!!
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Old 18 December 2012, 05:11   #6
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Never heard of it happening, even when we took the boats on cold weather tests in Norway. Must be the Welsh extreme weather!!!
Its been fine since..... I'd love to know why it did it, has me puzzled.....
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Old 18 December 2012, 07:49   #7
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try tightening the cap on the remote oil tank, it sounds like the seal is not quite sealing properly, I have never heard of the oil thickening, it is going to be something silly thought.
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Old 18 December 2012, 14:45   #8
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try tightening the cap on the remote oil tank, it sounds like the seal is not quite sealing properly, I have never heard of the oil thickening, it is going to be something silly thought.
Hi Al, something silly I agree..... will try and see if the seal is the issue, thanks

Hope you are well mate /still enjoying retirement. We've just moved so a bit hectic here... a bit like camping for Christmas
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Old 18 December 2012, 22:31   #9
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Check the under hood tank cap. If it has been over tightened then it will have a hairline crack. and allow air into the system.
Cheers.
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