What is this Engine Noise?

You'll have to give more detail for a diagnosis! Does this happen in gear over a particular rev range (singing prop?) or at all revs regardless of gearbox? Is it continuous or intermittent?

Rob.

P.S. I once spent several days looking for a strange noise from my Maxi's engine until I discovered that I'd left a milk bottle resting on the driveshaft when bleeding the brakes...
 
It happened continuously when it was more than half revs in gear. It sounded mechanical I have a feeling it may have happened on another boat of mine. My engine hadn't been used for two seasons! I didn't get time to put any antifouling on the prop so it just has a coat of ACF-50 on it which I used to protect it over the winter - doubt that would make any difference.

Also do you switch the ignition off after you pull the stop button or the other way around and when are you meant to turn the stern gland knob, after you have used the engine or before. I have forgotten all this as i didn't use my last boat with a Yanmar much :rolleyes:
 
Zagato said:
Also do you switch the ignition off after you pull the stop button or the other way around
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It doesn't much matter. Turning off the panel once the engine's running only disables the warning alarms, the engine doesn't care. (Though obviously you shouldn't run it for any length of time in that state, in case one of the alarms might have been triggered.) I used to turn off the panel first, to avoid the annoying beep as the oil pressure dropped once it stopped.

The grease helps stop leaks from the stern gland, and if you have old non-teflon-impregnated packing it also adds some lubrication. However, the cutless bearing at the other end of the shaft doesn't really like grease, so you shouldn't pump it in willy-nilly. Just enough to stop drips, and if you find you're having to add lots then it's probably time to tighten the gland up a bit. The old necessity to pump in lots of grease came from white-metal bearings, which your boat won't have.

Pete
 
Very difficult to say what is generating a noise without lots of info. However, just an example - my Yanmar 1GM10 gave out an intermittent squeel some years back. This turned out to be a loose grub screw that should hold the hand start handle engagement pin in place. The pin was moving and sometimes catching its small enclosure on the engine front.
 
Thanks for the replies, It's definitely not belts, maybe cavitation. If memory serves, I think I had the same noise with the old boat! I'll carry on it doesn't sound drastic whatever it is....
 
As a total novice armchair expert I can tell you exactly what it is. Its the engine in its death throws. It will, in a very short period of time, just die. But never mind give me a call and I can tow you back to your mooring. Its no problem......honestly. Glad to be of service.
 
Lol. no I am pretty sure it's nothing, I'm sure I had it on the old boat and it went away, perhaps it is cavitation or just needs a good run. You can tow me anytime though Barry, I'll save a fortune on diesel to Poole and back ;)
 
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