Noisy Gori Propeller

RobF

RobF

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I've got a 2 blade Gori attached to a shaft drive Yanmar 2GM20. I've tried running the engine at medium revs without the propeller engaged and the engine runs sweetly. As soon as you put the engine/gearbox in forward above 1400 RPM, the noise is awful. I did polish the propeller and ensure that the blades opened and closed cleanly when the boat was out of the water (3 weeks ago). Any ideas as to what might be causing this noise and what I can do to fix it? I'd like to stick with a folding propeller if at all possible.
 
where is the propeller in relation to the boat ? Behind a deadwood ? On a P bracket ? I am thinking of water flow interfering with the petals, or possibly a thrust or cutless bearing out of alignment.


On mine at low rpm there is a ticking sound which vanishes as the revs increase.
 
I have a two blade Gori on a P-bracket, and so far (22 years I think) all is well. I check play ever year and very thoroughly clean the gears, and polish and grease - but it's difficult to know how much play has changed. I don't know if it's possible (or economic!) to have the pins removed, the bearing surfaces re-bushed and the pins replaced (or whatever is the correct terminology for those)?
 
Have you renewed the little buffer thingies that dampen the opening of the blades (assuming two blade is essentially same construction as three)? We just get clunky opening when ours need doing but suppose it's possible they allow some play?
 
I had a 3 year old gori prop fall off. It seperated from the vulcanized rubber in between the outer blades and just left a clump of rubber on sail drive shaft. I was going forward into berth and lost propulsion. Luckily quick thinking i jumped off onto pontoon.. I dived under boat and the blades were gone. I rang Gori and its apparantly never happened. I speak to marine engineers and they say its common. Gori did do me the favour of a cost price new one. Which i took and sold the boat soon afterwards.. But check the vulcanization in between if its loose or tearing you will lose power and bang.. Gone!
 
Hydrozoan said:
I don't think our two-blade Gori ever had buffers or any other rubber components.
Click to expand...

Agreed, no rubber or buffer components. It's got two blades, which mesh together at the hub with a cog style arrangement. The shaft is supported by a P bracket.
 
RobF said:
Agreed, no rubber or buffer components. It's got two blades, which mesh together at the hub with a cog style arrangement. The shaft is supported by a P bracket.
Click to expand...

No, just looked at the Sillette site - looks like renewing them every couple of years is an irritation restricted to three blade owners.
 
The problem may not be the propeller, but alignment of the engine. It could be out of alignment, possibly due to a failed engine mount. This can be checked without being slipped, unlike checking the propeller.
 
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