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The Norfolk Broads Forum / Broads Boat Owners Q & A / Engine oil breather mist
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Posted By Discussion Topic: Engine oil breather mist

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jimfin
Mar-11-2018 @ 10:59 AM                           Permalink
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Hi Guys. My engine has a rocker cover breather pipe that goes nowhere. Any ideas or pictures of an oil mist filter trap.
Don't want to put it into the air intake as it might suck it too much oil. Or I could be wrong!!! What do you think?
By the way. it's a new engine with only 80 hours.

If you don't use your boat. Sell it.

annville
Mar-11-2018 @ 11:52 AM                           Permalink
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Hi Jim What engine do you have? does it drop down to bottom of block,breathers normally connect to air filter from rocker cover after/engine side of element this is to not contaminate the element with oil, some engines have a pipe from engine block to below the sump then a pipe from the rocker cover to the filter box,the idea is to suck contaminated air from engine block with replacement clean air from below sump and burn any oil mist in combustion chamber this will stop any oily fumes coming from engine very important in a boat engine compartment which is inside the cabin. do you have a picture,does it look original,is it hanging loose, do you get any fumes coming out of the end of hose/pipe,it may be the air inlet to the block. John

jimfin
Mar-11-2018 @ 2:09 PM                           Permalink
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It's a new Marine power engine and I'm happy enough with it. The pipe comes out close to the air intake which is just a a sponge type fome over a metal intake tube. I have changed the air filter to a car type.
The old sponge would get black over time.
I don't want the engine getting oiley with the mist from the breather. Was thinking about maybe a bottle with some sponge in it to trap the mist and some holes to let the air out!!

If you don't use your boat. Sell it.

ADI
Mar-11-2018 @ 8:49 PM                           Permalink
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On my bmc it goes to the air filter, so any mist is sucked in with the air and not contaminating the engine room.

Regards

Adrian  Michelle

Beck  Braydon and Mere.

annville
Mar-12-2018 @ 12:36 PM                           Permalink
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Hi Jim I wouldn't expect oil mist from a new engine, what model engine, is it Chinese built? how did it come was it hanging? try the agent you bought it from i have no experience of these engines,sorry. John

imtamping2
Mar-13-2018 @ 1:25 AM                           Permalink
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Something like this should sort you out...

https://www.ebay.co.uk/itm/Oil-Catch-Can-Universal-Alloy-Breather-Tank-Catcher-Expansion-Bottle-Car-Bike/332581014765?hash=item4d6f5f8ced:g:a74AAOSw4ltaotfF

jimfin
Mar-13-2018 @ 10:17 AM                           Permalink
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Thanks for the link. There is very little mist. The inlet sponge got a little black over 80 engine hours. Might just rig up a small plastic bottle with a sponge in it to catch the mist.

If you don't use your boat. Sell it.

Dilligaf
Mar-13-2018 @ 11:23 AM                           Permalink
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I would expect a new engine to breate a bit heavier than normal till it's properly run in and burn a drop of oil too, if you take it too easy on new bores it will not do them any good as they can glaze up before they bed in.

Dave.
Formerly 'LeoMagill'

annville
Mar-13-2018 @ 1:16 PM                           Permalink
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Hi Jim 80 hour = 4000 miles the engine should be run in by now,has the oil and filter been changed as per manufacturers service schedule,this is to cover any warranty issues,have you had it from new? or have you bought the boat recently. What ever. I would drill a hole in base/back of air filter/engine side of paper element and attach a plastic oil resistant hose into the hole or attach a hose connector to air filter housing then attach hose to this,this is how it should be on modern engines any fumes are then sucked and burnt in combustion chamber and the block has a lower air pressure which tends to stop any oil leaks,ie sucks oil in rather then push it out. a slight blackening of the filter element in one spot is quite normal for that length of time so quite normal.John

jimfin
Mar-13-2018 @ 3:01 PM                           Permalink
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The filters have all been changed. When I say mist I mean over a long period. I started up today and held a tissue paper to the outlet and no oil mist.
I'm getting a longer pipe and going to feed it into the new car type air filter I have fitted.

If you don't use your boat. Sell it.

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