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Mayday mechanical


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#1 vic008

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Posted 03 September 2019 - 10:15 AM

Out for a few days, and shutting motor down, she was making some odd noises. Wouldnt start this am,took tappet cover off, and big spanner on flywheel and turn her (check tappets ok)and turns free then comes to a sudden stop! Help please. Should I try turning her backwards?
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#2 Maté

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Posted 03 September 2019 - 10:48 AM

Rule 1 dont force it.

 

Can you rock the flywheel back and forth with the spanner to the same hard spot? Could be a number of things but sounds serious, something in the valve train?


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#3 Steve Pope

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Posted 03 September 2019 - 11:06 AM

Don't turn it backwards!!!


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#4 vic008

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Posted 03 September 2019 - 11:14 AM

Unfortunately spun her over on the starter this am. Cant be helped. Yes can rock her but then she comes to the spot where she stops. What are the bad scenarios? What tests before head off? Dread sailing home -20m. Wind here so fluky
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#5 Ladyhawk

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Posted 03 September 2019 - 12:19 PM

Sounds like its dropped a valve... :cry: you might be able to see which one with the tappet cover off, not that it helps you much out there. CG member?


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#6 wheels

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Posted 03 September 2019 - 12:29 PM

Sorry Vic. this doesn't sound good. A solid dead stop means a serious obstruction. Scenarios...... Valve head broken and fallen into cyclinder. Conrod has broken and is jamming against the bottom of bore. Crankshaft is broken. Cam must be OK if you saw all tappets working, so that's ruled out. A bolt has come out of Big end bearing and jammed.
You should find that in all scnearios, the engine will stop at same point. Mark the flywheel and buy hand, if you turn flywheel backwards, does it jam at ruffly same position. If yes, then any of the above are possible.
If not, then it could be a component in part of the engine that is geared down. Like the Fuel pump for example, may jam at fourth Revolution or some other random point.
No matter what, sorry but you are going to need a tow home, or sail it home if conditions are right for you.


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#7 vic008

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Posted 03 September 2019 - 01:34 PM

Ordered up a tow. (No coastguard here) So sounds like head to come off for a start?
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#8 Winter

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Posted 03 September 2019 - 01:46 PM

could be water in a cylinder, cant compress so piston stops dead. remove injector and you may be able to insert a straw
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#9 Island Time

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Posted 03 September 2019 - 02:44 PM

Usually if it's mechanical you can hear the metalic clank as the crank hit the broken rod or whatever. If it's water, removing the injector and then turning it over will give you a shower....


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#10 DrWatson

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Posted 06 September 2019 - 06:15 AM

Updates?
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