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Old 05 July 2009, 18:11   #1
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Martini not very well - rattling Opti

On my way to Sark on saturday, saw someone I knew, went alongside him and gave the motors a handful of reverse to stop. (twin Optimax 225)

The moment I did this, the starboard motor started to rattle really loudly. Wondering what I had done I stopped the motor, took off the cowl and had a look around for anything unusual.

All looked ok so I restarted the motor and had a look to see if I could find where the noise was coming from. Couldnt tell much except it seemed to be internal.

Nothing much I could do so refitted the cowl and carried on. Sometimes, under load, the noise would almost dissappear but after a further 40 miles or so before I got home it didnt get any better or worse.

I figure if it was a big end bearing that had spun etc., it would've completely destroyed itself by the time I got home so maybe the lower crankshaft bearing? Any other ideas anyone?

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Old 05 July 2009, 18:30   #2
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Martin,

I seem to remember some people had problems with bolts failing (was it alternator? or compressor?) on optis - not sure if that would give you the sort of rattle?

A search should find it - I think Bruce Hawskter (sp?) had the problem - but others then said they had too although memory is vague?
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Old 05 July 2009, 19:09   #3
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Originally Posted by martini View Post
On my way to Sark on saturday, saw someone I knew, went alongside him and gave the motors a handful of reverse to stop. (twin Optimax 225)

The moment I did this, the starboard motor started to rattle really loudly. Wondering what I had done I stopped the motor, took off the cowl and had a look around for anything unusual.

All looked ok so I restarted the motor and had a look to see if I could find where the noise was coming from. Couldnt tell much except it seemed to be internal.

Nothing much I could do so refitted the cowl and carried on. Sometimes, under load, the noise would almost dissappear but after a further 40 miles or so before I got home it didnt get any better or worse.

I figure if it was a big end bearing that had spun etc., it would've completely destroyed itself by the time I got home so maybe the lower crankshaft bearing? Any other ideas anyone?

Aren't they still under warranty?
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Old 05 July 2009, 19:38   #4
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Doubt it's the powerhead - more likely prop/gearbox related.

Could even be mountings or brackets. How much did the engines kick up on reverse? How much throttle did you give?
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Old 06 July 2009, 02:03   #5
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I had the compressor bearings go also alternator bracket bolt and belt tensioner spring

If compressor take cowl off stick a screwdriver on the unit and stick your ear on it you will know if it is wearing .


Could be gearbox if only happened after whacking it in reverse .

How old engines ?

If in doubt get the mech to look it over as only guessing and going from my own experiences.
Tim
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Old 06 July 2009, 02:41   #6
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I hope it is nothing too serious.

Mel said she thought she saw a big RIB to the south might have been you? We were on the way back from St PP.
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Old 06 July 2009, 07:10   #7
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You must have been a bit off course if Martini was in Sark
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Old 06 July 2009, 07:36   #8
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You must have been a bit off course if Martini was in Sark
We came back a fair bit to the south of the straight line course, plus Martini II does have quite a distinct profile. (Mind you, with my eye sight it could have been the Commodore Clipper for all I know!)
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Old 06 July 2009, 07:49   #9
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(Mind you, with my eye sight it could have been the Commodore Clipper for all I know!)
Yep, easily mistaken After a day in Guern, you can be forgiven for hallucinating. Both are desirable vessels mind you. One quite cool and fast, but the other has a bar on board.
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Old 06 July 2009, 08:05   #10
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... the other has a bar on board.
I think that qualifies as giving him ideas!

Seriously though, I hope the engine is ok and that it was just a lose bracket.
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