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30 March 2023, 19:05
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#1
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Member
Country: UK - England
Length: 6m +
Join Date: May 2015
Posts: 8
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Mercury Optimax
Hi all,
Pretty new to the forum and hopefully i have posted this right !! I have a Mercury Optimax 115hp on my rib and it has started to make a funny noise when i am dropping the throttle off. Accelerating etc are all fine but when i drop off there is like a whine or something almost like the sound of a belt slipping or something. I would be very grateful if anyone could offer any advice as to what they think it might be.
Thanks in advance
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30 March 2023, 19:16
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#2
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Member
Country: UK - Scotland
Town: Fort William
Make: Ribcraft 585
Length: 5m +
Engine: Yamaha F115
Join Date: Mar 2012
Posts: 2,920
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Do these engines not have an alternator belt? Unusual for a belt to slip on the overrun and not under acceleration.
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There is a place on this planet for all of Gods creatures.........right next to my tatties and gravy.
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30 March 2023, 19:48
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#3
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Member
Country: UK - England
Length: 6m +
Join Date: May 2015
Posts: 8
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It does yes i believe but i do not think that is the cause. I do have a short video of it but am struggling to find a way of uploading it. Not very tech savvy
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30 March 2023, 20:18
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#4
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Member
Country: UK - England
Town: Gosport
Boat name: April Lass
Make: Moody 31
Length: 9m +
Join Date: Aug 2001
Posts: 4,951
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Stick the video on You Tube and then link to it.
Pete
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30 March 2023, 20:35
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#5
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Member
Country: UK - England
Length: 6m +
Join Date: May 2015
Posts: 8
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https://youtu.be/TSqjJNgd28g
Hopefully this works. Thanks
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30 March 2023, 20:40
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#6
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Member
Country: UK - Scotland
Town: Fort William
Make: Ribcraft 585
Length: 5m +
Engine: Yamaha F115
Join Date: Mar 2012
Posts: 2,920
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Quote:
Originally Posted by carrich9073
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Video is “private”..
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There is a place on this planet for all of Gods creatures.........right next to my tatties and gravy.
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30 March 2023, 20:50
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#7
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Member
Country: UK - England
Length: 6m +
Join Date: May 2015
Posts: 8
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Sorry. Hopefully sorted now
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30 March 2023, 21:22
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#8
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Member
Country: UK - Scotland
Town: Fort William
Make: Ribcraft 585
Length: 5m +
Engine: Yamaha F115
Join Date: Mar 2012
Posts: 2,920
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Sounds like turbo flutter from an old school rally car.
Did it just appear one day? Is it getting worse?
__________________
There is a place on this planet for all of Gods creatures.........right next to my tatties and gravy.
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30 March 2023, 21:28
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#9
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Member
Country: UK - England
Length: 6m +
Join Date: May 2015
Posts: 8
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Yes. Just appeared on first trip out last year. Didn't appear to get any worse, just pretty annoying noise. It does sound a bit like that without the air dump.
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30 March 2023, 22:02
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#10
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Member
Country: UK - Scotland
Town: Fort William
Make: Ribcraft 585
Length: 5m +
Engine: Yamaha F115
Join Date: Mar 2012
Posts: 2,920
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If it were me I’d stick a bit of belt dressing on the belt then let it develop.
__________________
There is a place on this planet for all of Gods creatures.........right next to my tatties and gravy.
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30 March 2023, 22:14
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#11
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Member
Country: Sweden
Town: Falun
Make: Zodiac Futura Mk 2c
Length: 3m +
Engine: Suzuki DF20A
Join Date: Aug 2021
Posts: 136
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I had one of these engines before. Very good motor. Fuel efficient and powerful!
I'm pretty sure it has a belt-drive compressor to be able to deliver compressed air into the fuel rail and then mixed fuel and air into the combustion chamber. Anyway, I would check the belt at the top of the engine. There is a cover that pops off. That belt needs to be in great shape. Also check any hoses going from the compressor.
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04 April 2023, 19:09
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#12
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Member
Country: UK - England
Town: Nottinghamshire
Boat name: Wakey
Make: Tornado
Length: 5m +
Engine: Mariner 75 2 stroke
Join Date: Jun 2014
Posts: 603
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Quote:
Originally Posted by A1an
Video is “private”..
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The rest of us watched it...it's you...your on youtubes naughty list 
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05 April 2023, 17:53
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#13
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Member
Country: UK - England
Town: Farnborough
Boat name: Narcissus
Make: Cobra
Length: 7m +
Engine: Optimax 225
Join Date: Jul 2003
Posts: 2,364
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Quote:
Originally Posted by dhaglund
I had one of these engines before. Very good motor. Fuel efficient and powerful!
I'm pretty sure it has a belt-drive compressor to be able to deliver compressed air into the fuel rail and then mixed fuel and air into the combustion chamber. Anyway, I would check the belt at the top of the engine. There is a cover that pops off. That belt needs to be in great shape. Also check any hoses going from the compressor.
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Agree with this.
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