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Old 22 July 2003, 11:03   #1
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Whats the right way to change a prop

Ok I've dented my Ali prop (somewhat sooner that I'd have liked ) so I'm going to get a stainless steel one .

Engine is a Suzuki DF140

But how to change it.

I assume that it is take the plugs out so the engine can't fire. Stick it in gear / clamp the prop so it can not rotate. remove the split pin and undo the castle nut then pull/wiggle till the prop comes off.

Slot the new one on and do everything back up.

Sounds easy, but what am I missing, what should I watch out for when putting the new one on to make sure it all works ok.

Should I change anything else whilst changing the prop ?
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Old 22 July 2003, 12:01   #2
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Q&A

Well, if I were changing a prop and wanted some advice I'd come to you. You seem to have noted every detail. I had cause to change my prop about 2 months ago after my daughter thought it would be nice to fill the aperture behind the prop with stones and shells whilst she sat on the beach - nice ! I employed the services of my local boat yard Abersoch Land and Sea (rip off merchants) who under supervision did exactly as you detail taking no more than 7 minutes. Just be careful with the Castle washer, they are quite thin.
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Old 22 July 2003, 12:12   #3
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Why would you need to take the plugs out? Key out, leave in gear and remove kill cord should be sufficient to ensure that it wont start. Or am I missing something (other than obviously having flirted with death in the past changing props! )
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Old 22 July 2003, 12:33   #4
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Much easier than that, put the gearbox in neutral so you canít turn anything at all, use a trusty block of wood to stop the prop rotating and hence undo the nut.

Like you say always remove the Kill cord just encase.

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Old 22 July 2003, 12:57   #5
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If you're as physically and emotionally attached to your limbs as I am to mine, I suggest that it would be wise to remove the HT leads at either the coil or spark plug end (depends what's more accessible on your engine). Then, just in case there's a wiring fault anywhere, you're fully isolated.

I guess this is what you actually meant by "remove spark plugs", Martin? 'cos if you unscrewed the spark plugs and put it in gear, that would not serve any purpose as there would be no compression with the plugs removed, so no resistance at the prop, except for the drag of the drivetrain.
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Old 22 July 2003, 14:24   #6
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Thanks for all your replies.
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Old 22 July 2003, 15:00   #7
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Crikey - you guys are a paranoid lot. I took both my props off yesterday, just make sure your battery isolater switch is off. Sheeesh?!
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Old 22 July 2003, 15:03   #8
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Yeah, but you jump out of perfectly serviceable aeroplanes!
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Old 22 July 2003, 15:11   #9
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Martin, you will probably need a large piece of wood to wedge between the prop and the anti-ventilation plate to stop said beast turning whilst you undo the nut.

Do you know what torque you need to tighten the prop nut up to when you fit the new prop?
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Old 22 July 2003, 15:12   #10
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Quote:
Originally posted by Richard B
Yeah, but you jump out of perfectly serviceable aeroplanes!


hehe nice one
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