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I have a 2014 300 apxx, and I'm getting some water under the cowling from where the cowling air intake tube seals against the the motor fascade (plastic covering) over the fly wheel, there is a foam gasket at that spot but I just don't think any water should be draining from the intake set up into the flywheel housing or the motor area. And yes I have checked for leaks in the cooling system under the cowling. Just came back from the Tortugas in 6-10' seas and of course more than usual but wanted to know if anyone else is having this issue? I use the boeshield spray and I have been cleaning with salt away to remove the salt. Any ideas why the water is getting into the intake? Also only have a single motor.
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Certainly there should NOT enter any water inside the cowling, especially not sea water oer the flywheel!
There may be some drops coming in on the cut between the lower and upper cowling, but not trough the air intake, and if it comes from the air intake then you have a serious problem.
You should verify where the water enter the cowling, if it's really thru the air intake slits, or if there is a leak inside the cowling.
In a few days i will be back anc can check the air intake water trap routing on my DF300AP in Italy but i guess that the water did not entered there, except you got hit hard by a wave(s) from following seas.
I guess (and hope for you) that there is a hose leaking on the engine, especially the thin hose from the pitot tube to the connector under the power head. If this is hose for the speedo is not connected/got disconnected it can leak/spray the water entering the pitot hole on the lower unit inside the cowling.
You may test your engine with the cowling off to see if you can find a leak,
if not then the water came thru the air intake slits on the back of the cowling bypassing the water trap. You can check that with a hose ans pray insde the air intakes with the cowlng on the floor to see where the water exits the cowling. I have seen Yamaha cowlings having thin drain tubes and they became clogged from dust/salt/dirt and did not evacuate the water outside.
Chris -
Chris,
Where is this pitot hose located? I have run the motor with the muffs and up on RPM and no leaks found. The seas were 6-10 couple 12s head on and quartering, let's just say even without rain we got monsooned, lucky to be alive. I have noticed this water before though very slight and it all seems to come from the gasket that seals the flywheel to cowling tube.Comment
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The pitot tube will not show leaks when you run the engine on muffs, only when the boat is running fast in the water as the water pushes in the pitot tube and create pressure. If this hose is not connected she will leak water inside the cowling.
You can see the pitot tube in front of the lower unit above the bulb, a very small tube.
As far i remeber, the palstic hose withthte plug is in the front of the engine, under the cowling and power head, there you will see a tiny black plug (most likely plugging a small transparent plastic hose coming up from the lower unit.
If you get the speed info from your GPS then the black plug must be installed,
if your speed info comes from the pitot tube then the transparen tube should go thru the rigging hose to the instruments.
ChrisComment
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Yeah not my first rodeo! I've had boats and have done the maintenance for it along time, previous motor was a merc. Anyway I took off the cowling and sprayed water at it and yes it does come over the vent that has a high wall dam and it comes directly over the flywheel and separate from the intake system, there was also a guide pin hole for the top part to align itself into the cowling it would leak too. I put 5200 on all guide pin holes. As far as the side vent for the flywheel not a good design especially in rough windy weather, no way to prevent some water into cowling. We were getting hammered but even withou I've noticed a small amount that will get in from spray blown at the motor, it should of had a reverse cowling over the vent along with the high dam, when you check yours you will know exactly what I mean. I have two trim tabs but only spray ever see is from the lower and it vees out from the the lower mid and out ward towards the plane or in rough seas.Comment
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Well,
i have 3 DF300AP and i never had this problem, but i will verify the water drain problem in some days whan i am back on the boat.
If the water comes in thru the air inlet, i suggest to get a outboard cover with a screen over the air inlets as this probably reduces the amount of water ingested. Make sure that you get the ones to leave on while using the engines and that they have a fine screen and not only a cut-out where the air intakes are.
Like this ones for example:
Suzuki Outboard Splash Cover suit DF70A / DF80A / DF90A
http://www.tuffskinz.net/
ChrisLast edited by ChrigelKarrer; 05-23-2016, 05:08 AM.Comment
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If you've been in rough water I assure you it gets in especially if the wind is blowing spray back at it, short of lake cruising. As far as the covers, Suzuki should fix the design as a TSB, I shouldn't have to buy a 200 $ cover. A reverse scope covering the area along with the high water dam should fix.Comment
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According to the the Suzuki tech that rigged my motor at International Marine, this will happen if spray comes at left side of all the motors that are set up with same style vent, no way to prevent it, he said this vent acts as a vacuum but I think that it actually vents the warm air from around the crank case via the flywheel action under the plastic shroud so the intake air under the cowling stays at a cooler charge for the throttle body, according to the zuke literature. Anyway, he said he takes his cowlings off after rough weather or waves and sprays off and treats with a spray lube.Comment
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If you can get a Lanoline spray on the engine it will repel the water and protect from corrosion.
I use the Ozspray version. Good stuff. I redo it once every year or so.
Ozspray Industry Extra Grade - Products - Woolube Lanonlin ProductsComment
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I use the Boeshield T-9 from Boeing made to prevent corrosion In the aerospace, leaves a oil wax over the surface supposedly. Also good stuff.
http://boeshield.com/Comment
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I have a correction regarding the pitot hose,
the hose is not under the front of the engine, it's coming up on the port side in about the middle of the engine.
It's a thin, black rubber hose with a black platic plug in it.
Here in Sardinia i use the dive RIB daily and often for days/weeks in 40+ knots of wind blowing off the shore so that i can sneak along the shore to avoid big waves.
The lateral Mistral wind blows the spray over then engine starboard while going diving and port side when going back and i never had this problem.
The only hint i could give you is to be so fast that the spray end's behind the engines ...
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