Engine Cut Out

[johnk]

Hi, I am a recent RIB purchaser - I have a 7.5m 200hp boat. On several occasions when boating this summer I experienced the engine warning alarm shortly thereafter followed by a persitent (but not complete) cutting out of the engine. As I reduced speed this problem ceased. I am thinking that I was not properly trimmed to start with (trim not all the way down) which may have caused the bow to pitch and the weight to put the engine under stress. This makes sense but there were other days (when I believe I trimmed in the same manner) where I had no problem and the engine operated fine at high and low speeds. I am thinking to start off initially I should have trim all the way down and then trim up later when at cruise speed. Does anyone have any input? I appreciate this may be a basic problem that I am somehow missing - but any help is appreciated.

[Nasher]

Hi
And welcome to Rib.net.

It sounds like your engine was going into limp home mode, and In my opinion is unlikely to be anything to do with trim, unless you were trimmed so far out you reduced the cooling water pick up to the point where the engine was overheating.
What engine is it?

Nasher

[timw]

I suspect the alarm you heard was the engine overheat warning, followed by the engine automatically cutting revs as a safety deature.

You probably picked up a plastic bag or somthing that temporarily blocked the cooling inlet and it dropped away when you slowed down and hey presto all was OK.

Happens to me all the time on the Thames

[The Garfish]

Originally Posted by timw

You probably picked up a plastic bag

Originally Posted by johnk

On several occasions

dat plastik bagg iz getin too bee a fkin noosance

gaRf

[Nos4r2]

Originally Posted by timw

I suspect the alarm you heard was the engine overheat warning, followed by the engine automatically cutting revs as a safety deature.

You probably picked up a plastic bag or somthing that temporarily blocked the cooling inlet and it dropped away when you slowed down and hey presto all was OK.

Happens to me all the time on the Thames

Out of interest, do you notice anything else when it happens? The engine sounding louder for example?

[Poly]

Is the engine alarm continuous or intermittent. One will indicate overheat and the other an oil level problem (not sure if these are the same way round on all engines?).

I find that when starting to get a bit low on oil my engine will alarm if tilted into shallow drive (like trimming out/up - fully) - this is long before the oil level drops to a critical level.

[blinddog]

As above also check impeller condition, at high speed is water still comming out telltale.
gaZ