Ticking Noise: Mariner 30, 2S, 1990's

HughN · 19 August 2014, 11:29

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

Pikey Dave · 19 August 2014, 12:21

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

Loose shift rod?

HughN · 19 August 2014, 21:08

Quote:

Originally Posted by Pikey Dave

Loose shift rod?

Not that I can see / feel / hear. I probably left my watch inside it...

Festinghouse · 19 August 2014, 21:19

my money would be on reed valves. couldnt tell you what causes them to tick though

dave3235 · 20 August 2014, 11:23

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

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.

HughN · 20 August 2014, 17:05

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.

dave3235 · 20 August 2014, 17:48

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.

It's possible it could be your woodruff key.

HughN · 21 August 2014, 10:52

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.

HughN · 21 August 2014, 20:15

Problem found...

The ignition timing plate was being hit in one place by the flywheel - one or both of them is not perfect.

HughN · 22 August 2014, 13:42

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.