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19 August 2014, 10:29
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#1
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Member
Country: UK - England
Town: Littlehampton, W Sx
Length: no boat
MMSI: 235101591
Join Date: Jan 2012
Posts: 732
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Ticking Noise: Mariner 30, 2S, 1990's
I've just put my 1990's Mariner 30 back together. At idle I can hear a ticking noise that in a four stroke car engine would make me think it was a 'bit tappety'.
Using a listening stick (i.e., a screwdriver) it is definitely coming from the carb end of the engine. A passing neighbour reckoned it was the sound of the reed valves but I can't believe its possible to hear them closing - is it?
Sometimes its best not to listen to these things.
Thanks
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"Can ye model it? For if ye can, ye understand it, and if ye canna, ye dinna!" - Lord kelvin
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19 August 2014, 11:21
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#2
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Member
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
MMSI: 235111389
Join Date: Feb 2008
Posts: 12,136
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Quote:
Originally Posted by HughN
I've just put my 1990's Mariner 30 back together. At idle I can hear a ticking noise that in a four stroke car engine would make me think it was a 'bit tappety'.
Using a listening stick (i.e., a screwdriver) it is definitely coming from the carb end of the engine. A passing neighbour reckoned it was the sound of the reed valves but I can't believe its possible to hear them closing - is it?
Sometimes its best not to listen to these things.
Thanks
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Loose shift rod?
__________________
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4: Don't feed the troll
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19 August 2014, 20:08
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#3
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Member
Country: UK - England
Town: Littlehampton, W Sx
Length: no boat
MMSI: 235101591
Join Date: Jan 2012
Posts: 732
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Quote:
Originally Posted by Pikey Dave
Loose shift rod?
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Not that I can see / feel / hear. I probably left my watch inside it...
__________________
"Can ye model it? For if ye can, ye understand it, and if ye canna, ye dinna!" - Lord kelvin
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19 August 2014, 20:19
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#4
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Member
Country: UK - England
Town: Chorley / Holyhead
Boat name: Northwind Challenger
Make: Tornado
Length: 6m +
Engine: Mariner 115 efi CT
MMSI: 235080598
Join Date: Jun 2011
Posts: 1,411
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my money would be on reed valves. couldnt tell you what causes them to tick though
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"Life may often suck, but the alternative is unacceptable"
MMSI Sticker
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20 August 2014, 10:23
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#5
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Member
Country: UK - England
Town: Bristol
Boat name: Salty Cheeks
Make: Honwave
Length: 3m +
Engine: 20hp 2stroke Mariner
Join Date: Mar 2014
Posts: 485
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Quote:
Originally Posted by HughN
I've just put my 1990's Mariner 30 back together. At idle I can hear a ticking noise that in a four stroke car engine would make me think it was a 'bit tappety'.
Using a listening stick (i.e., a screwdriver) it is definitely coming from the carb end of the engine. A passing neighbour reckoned it was the sound of the reed valves but I can't believe its possible to hear them closing - is it?
Sometimes its best not to listen to these things.
Thanks
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Hi All
If it's your shift rod put some lateral presure on it so to stop any play if there is any and listen again.Also is it a merc based or yam based engine this could make a difference.
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20 August 2014, 16:05
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#6
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Member
Country: UK - England
Town: Littlehampton, W Sx
Length: no boat
MMSI: 235101591
Join Date: Jan 2012
Posts: 732
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Thanks,
Its a Yamaha based engine. I've had a look at the shift rod and the noise doesn't change.
I'm starting to think its under the flywheel so I suppose that's coming off again.
__________________
"Can ye model it? For if ye can, ye understand it, and if ye canna, ye dinna!" - Lord kelvin
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20 August 2014, 16:48
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#7
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Member
Country: UK - England
Town: Bristol
Boat name: Salty Cheeks
Make: Honwave
Length: 3m +
Engine: 20hp 2stroke Mariner
Join Date: Mar 2014
Posts: 485
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Quote:
Originally Posted by HughN
Thanks,
Its a Yamaha based engine. I've had a look at the shift rod and the noise doesn't change.
I'm starting to think its under the flywheel so I suppose that's coming off again.
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It's possible it could be your woodruff key.
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21 August 2014, 09:52
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#8
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Member
Country: UK - England
Town: Littlehampton, W Sx
Length: no boat
MMSI: 235101591
Join Date: Jan 2012
Posts: 732
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I can't find the source of the noise.
When I put the inlet side of the crankcase back together I used some semi-flexible sealant to do so (I'd tried Wellseal first). I wonder whether this (even though it is very, very thin) is allowing the castings to 'bounce' against the heads of the bolts as it goes +ve pressure, -ve pressure, etc.,
There is a short/shaft tiller version of the same engine for sale; I might buy it and convert it to long shaft and electric start using bits from my current engine.
__________________
"Can ye model it? For if ye can, ye understand it, and if ye canna, ye dinna!" - Lord kelvin
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21 August 2014, 19:15
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#9
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Member
Country: UK - England
Town: Littlehampton, W Sx
Length: no boat
MMSI: 235101591
Join Date: Jan 2012
Posts: 732
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Problem found...
The ignition timing plate was being hit in one place by the flywheel - one or both of them is not perfect.
__________________
"Can ye model it? For if ye can, ye understand it, and if ye canna, ye dinna!" - Lord kelvin
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22 August 2014, 12:42
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#10
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Member
Country: UK - England
Town: Littlehampton, W Sx
Length: no boat
MMSI: 235101591
Join Date: Jan 2012
Posts: 732
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I've got pretty cheesed off with this engine and don't think Ill be able to trust it so today I've bought a tiller steer/throttle, manual start Yamaha motor (the one which the Mariner is based). All the remotes and electrics (choke, starter, etc., ) have been moved across and I'll bung the rest on eBay piecemeal.
Problem solved.
__________________
"Can ye model it? For if ye can, ye understand it, and if ye canna, ye dinna!" - Lord kelvin
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