First, most water ingestion is not from the intake manifold, it is from
the exhaust system and the ski being righted incorrectly. Water
ingestion through the intake system happens when you fill the ski with
water or you've got some type of pressure leak (ala the infamous SD 951
motor in its debut year where the exhaust gasket was leaking, shooting
cooling water into the intake system). If you are confident in your
sensing system (how does it differentiate from the air/fuel mixture and
water?), then you should be able to ride the ski with the seat off and
find the source of the water. Fact of the matter is, water does not
compress and once it's in the engine, something has to give, usually the
crank or a rod if you get it started. Usually hydro lock will
demonstrate itself when you try and start the ski and you can
immediately clear the engine with the plugs out. The starter is not
strong enough to do any damage to the engine.
Tom
Kjell Martin wrote:
> How many people have had engine damage or destruction from water?
> How many from rolling it or getting the engine compartment filled with
> water?
> How many from towing the jetski?
> How many from unknown causes but water was the supposed reason?
>
> I just got my jetski back after having the engine rebuilt. I put a water
> sensor alarm in the intake manifold. The sensor detected water after pulling
> the jetski from the water and sitting on the boat ramp with the engine
> purging remaining water. Just for clarification, the jetski was out of the
> water when the alarm detected water in the intake manifold. The jetski never
> rolled since the engine was rebuilt; it was on its first half hour ride.
> After 24 hours out of the bay, the sensor still shows water in the intake
> manifold. The access to the drain plug on the engine is severely limited
> (have to remove all sorts of parts to get to it).
>
> I figure I'll have to externally heat up the intake manifold since I'm not
> prepared to remove all the pieces just to get to the drain plug. I figure
> too low of heat will only increase engine corrosion if any is to occur. I do
> want to clear the water out even if it is minute; I'd like to dry it so that
> the sensor picks up the next occurrence.
>
> Since I'm not the only that has probably experienced this but never knew it,
> I'm wondering how many jetskis have died from unknown reasons for water
> uptake.
>
> I'm not quite ready to defame the manufacturer yet. It all depends on how
> they respond.
>
> I'll be adding a bilge pump and other detection devices to prove to the
> manufacturer that its a design flaw that caused the initial problem.
>
> If you've had a problem with your jetski engine due to water ingestion I'd
> like to hear about your problem.
>
> Kjell
>
><!-- ~MESSAGE_AFTER~ -->
>> Stay informed about: Engine Destruction from water