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Year

OMC SEADRIVE water ingestion

masondr I have a 115 OMC SEADRIVE outboard that is getting water into the crankcase. Local technician cant solve. Can water be sucked in thru bad crank shaft seals? Into exhaust ports from failed exhaust cover gasket? Engine riding too low to waterline? Other ways? Gas doesnot have water, head gaskets are ok, and have not found any cracks visually or with pressure test. Help! 2001-12-01
clanton Which cylinders have water in them? How did you pressure test block? 2001-12-02
masondr Clanton: Thanks for response. Not sure which cylinders. Suspect#4, since it fouls consistently. I have engine torndown. Upper and lower crank bearings are rusty and loose.Crankcase head rusty and one of thebearing retainer bolts was loose and not sealed.Not sure about pressure test. Local mech. claims to have done, but details are sketchy.Engine was "rebuilt" by mech.1year ago, but never ran right after that. 2001-12-03
masondr Anybody know about water ingestion in outboards? My powerhead is beyond rebuild.Before I replace it, I wanted to make sure the problem was in the powerhead, and not some other factor such as engine height from waterline,etc. Thanks 2001-12-07
Dhadley Typical injestion is as you describe. Damage is worse at the top and bottom of the crank and better toward the center.

A mist of water is pulled in through the air intake into the air box. There water goes to the lower bearing via that small hose at th

2001-12-07
byordy The most likely cause of water in the crankcase, particularly if it's the lower cylinder(s) is a faulty crankcase seal. There is also supposed to be an o-ring on the driveshaft to deflect the water and debris which travels up the shaft away from the seal. This helps prevent debris from wearing the crankcase seal. This o-ring seems to be missing in a lot of cases.
In any event, if the problem just occured then the crankcase seal/o-ring combo would be my first suspect.
Bill.....
2001-12-07
masondr Dhadley: Help me with water flow path. Is air box front of carbs or ducts in motor cover?Small hose to and from? Is water passing thru carbs or is this aseparate path to crankcase? Is air intake design different on seadrives?Would running in rain/fog have same effect? Problems started about when we went to salt water use and added a kicker motor. seadrive is a single on 18' cc. Sounds like you have seen this before.Thanks. 2001-12-07
masondr Byordy: O-ring is missing!Top and bottom crank seals were shot along with bearings, but I didn't know if this was cause or effect.Problems started about 1.5 years ago, when I went to salt water use. Added kicker about same time.Motor locked while sitting.Motor was "rebuilt", and problem was attributed to water in the gas.Motor never ran right after that.I recently tore motor down myself, with the results I described in posting.Would water entering thru bottom seal make it to top bearing? Both top and bottom bearings were rusty, with little indications elsewhere. Thanks for your help. 2001-12-07
masondr Dhadley/Byordy/anyone who can help further:I've got two good replies, but I need to pin this down further, if possible.My best outcome would be abad seal as cause rather than result of water.If cause is Seadrive riding too low, I don't know how to fix-no room to move up on transom.Any Thoughts on how I might narrow this further would be greatly appreciated.I'm 'dead in the water' till then. 2001-12-12
byordy dave seadrive,
Normally when the lower seal goes the lower cylinder(s) will start to miss because of water ingestion. If the water makes it around the crankcase seals it can migrate to the top of the block. I would expect that the water would be an ef
2001-12-13
masondr Byordy-Bill,thanks for coming back. Cav plate is even with keel, BUT Seadrive setback is~18 inches, so powerhead could be riding lower than "normal". Since top and bottom bearings were very rusty and loose, could'nt this defeat seals if water was coming from another source?like air intake? That's my dilemma. Mine doesn't have flex tube, but does have side as wellas back cover intakes, which might increase risk of ingestion.Mine is 1987, flex tube may have been used on later models-anyone know? retrofitting this sounds like a good idea, if possible. 2001-12-14
masondr Any body else out there with Seadrive knowledge/experience? Dhadley- if you are still out there, please come back. 2001-12-14
jungnim2 watt motor you have?
crosflo or lopper?
2001-12-14
masondr V-4 crossflow 2001-12-15
byordy dave seadrive;
I think that I remember the in-hull air intake being advertised the first year the sea drives came out. That's the best of my memory.
If water is being ingested into the air intake you should be able to see this happen by carefully w
2001-12-17
byordy dave seadrive,
Forgot this in the other post, but the engine height sounds about right to me. At least it should not be the problem unless your boat makes one heck of a stern wave or somthing is protruding into the water causing a spray.
Bill.....
2001-12-17
jungnim2 you ck the compression ?
you me have a brocken sleef in the motor
2001-12-17
masondr Byordy-Bill: powerhead is apart, so I can't further observe for spray.It's definitely salt water getting in-sig. corrosion on bearings and crank ends. exterior of block is clean, and I didn't see any water or corrosion in carbs or reeds. I notice that there are what appear to be two scuppers ,factory-built into the front lower cover,They are not clogged. apparently to drain water which might get in. Boat is trailered-does not sit in water when not in use. In-hull intake sounds like a way to move on with some confidence, if I can find one. Thanks again for your help. Dave. 2001-12-18
Dhadley I noticed you said the problem started after you mounted a kicker motor. Take a look at that and make sure nothing is causing a spray back there. It doesn't take much. What you are seeing is very typical water injestion. It's being introduced into the motor thru that small hose in the lower back of the air box.

Keep the spray away from the air intake and your problem will be solved.

Good luck!

2001-12-19
byordy dave seadrive;
You're on the right track. I think I would put the motor back together paying particular attention to the crankcase seals.
From what you've all ready done and dhadley's comments it does sound like water ingestion.
When you first r
2001-12-20
masondr Dhadley/Byordy: Thanks again.One last question(s), if you will bear with me, for sake of understanding. The little hose aparrently is a straight shot to the crankcase and then to the lower bearing and top bearing? What purpose does it serve, and can it be modified or blocked off? I've been told it's to recycle flooding from carbs?My manual doesn't cover this or the lube system for the bearings. Dave 2001-12-20
Dhadley You are correct about the purpose and path. Don't block it off. Stop the spray. You can have every reason to be confident that will cure the problem as it ran a long time before you mounted the kicker.

Good luck!

2001-12-20

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