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Old 06 April 2011, 15:14   #1
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Rattling sound from Mariner 25hp

I have just bought a used 1998 Mariner Lightning 25hp 2 stroke 3cyl for a very good price. We have testran it shortly in a container before we made the deal (private sale). Although it ran at high idle speed no strange sounds where audible.

Tonight I was testrunning it at home, (I have turned down the idle speed) but a pretty worrying sound is audible when you close the throttle. It also cuts out at idle. Check out this video () to hear what I mean.

I am not am expert, but I am affraid the big end bearings are worn. Please give me your opinion if you have the expertise.

I will have the outboard checked at an outboardshop before I put her on the back of my SIB.

Ciao,
QV
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Old 06 April 2011, 17:49   #2
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That doesn't sound like big ends-more like it's not out of gear properly. Is it definitely coming from the powerhead?
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Old 07 April 2011, 10:03   #3
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It could well be coming from the flywheel or starter mechanism I reckon. Any suggestions to check?
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Old 08 April 2011, 15:33   #4
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Sounds to me like the rope pull starter pawl is catching ,
sometimes just pulling gently on the starter rope can cure it if it is that .
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Old 08 April 2011, 18:46   #5
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some engines are fitted with a safety lock mecanism on the pull start so the engine can only be started in neutral and not in drive ,

could be something like that which may be just out of adjustment and is catching the flywheel
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Old 08 April 2011, 19:11   #6
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Yeah, what they said.

You should be able to disconnect the mechanical start in gear protection to check that.
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Old 17 April 2011, 15:54   #7
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update

It is at the repairshop, which has diagnosed the big-ends or the crankshaft bearings to be worn...... It is going to have a complete overhaul of the powerhead $$$!

When I delivered the outboard I told the repairshop to have a look at the cause of the rattling sound that seems to come from the startermechanism. Unfortunatly it was not the startermechanism.

Cheers for your input anyway!
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Old 18 April 2011, 17:58   #8
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hmm in the video jst before it died it looks like the starter pull cord mech was catching. you could see it moving.

Or was it just me .
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Old 20 April 2011, 04:58   #9
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Quote:
Originally Posted by jezza2011 View Post
hmm in the video jst before it died it looks like the starter pull cord mech was catching. you could see it moving.

Or was it just me .
I can see what you mean. The shop has a good reputation and I did not mention the bearings myself. Anyway, I will ask for the old parts.
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