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Old 23 July 2003, 04:23   #31
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As a racer, we tend to take our props off every time we take the boat out. It's not the cost of replacement although they are VERY expensive, it's the fact that a prop is impossible to recreate perfectly that is the problem.

I'm with Dirk on this one - remove split pin or bend back tab on washer - in neutral - block of wood - undo nut.

If it's in neutral it cannot start - if the key is in your pocket your 5 year old cannot start it.

Reverse the process to fit prop, having made sure the shaft is clean and regreased first!

While you're at it check / replace the oil in the gearbox!

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Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
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Old 23 July 2003, 06:33   #32
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Quote:
Originally posted by Cookee


While you're at it check / replace the oil in the gearbox!

VERY good tip Cookee. That is exactly what I did on Monday. Found a bit of water in the gear-boxes as the seals were perished. Also, replaced the oil with the good Hi-perf green stuff.
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Old 23 July 2003, 07:33   #33
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Originally posted by mstacey
Dirk I don't find you rude at all.

However does
the pilot of the jet plane always know how to change the engine ?

and maybe just maybe were perhaps you once also in the position of never having changed a prop.
Hmm, So do you consider yourself the equivalent of a 747 pilot when your at the helm of your rib? Or captain of the Ark Royal. Although you are probably correct, I wouldn't mind betting that percentage wise they know alot more about their craft than you do about yours!!

I don't really think it's quite the same, do you? A pilot has the backup of a team of dedicated engineers, huge engineering and servicing teams etc etc. You only have yourself.

It's just basic knowledge, and common sense. And yes, many years ago I too was in the position of never having changed a prop, I seem to remember that within a couple of minutes I had acquired that knowledge, something that you ought to try as well.

As for the torque setting, you worry to much. It's very rare to use a torque wrench to fasten a prop nut, and it's unlikely that you would carry one on board for the odd prop change at sea. ( although I don't doubt that Manos has one to comply with the Greek coastguard)

Most people use the Gorrilla method, that is do it up bleeding tight. If it was a big Merc, then 55 ft lbs is ok, but tight is the norm.
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Old 23 July 2003, 09:26   #34
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Oh yeh, while you're there, have a quick look-see at the oil seal, clamp ring and lock washer. Nothing look loose? No fishing line wrapped around? No mouse nest in there after the winter? Good. It just takes 10 seconds longer.

It's the; out of gear, block of wood for me too.
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Old 23 July 2003, 09:36   #35
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Thanks Dirk and thanks to everybody else becaue, to quote Dirk slightly out of context ,' a couple of minutes' was it all it took to aquire the practical experience of changing the prop using the knowledge and helpful hints given on this forum.

Now if I can have some good weather and time off I can get out and see what the Rib will do with the new prop.
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Old 23 July 2003, 09:51   #36
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Martin, I use the same block of wood that I use to support the engine when trailing not wanting to rely on the hydraulics or the tilt support bracket to keep it of the road . [Also handy for fending off un-welcome visitors, berthing masters, jetskiers, etc ]

Yes, I know, Dirk, belts & braces again
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Old 23 July 2003, 10:01   #37
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Easier way !!!

Hey guys

I know an easy way of getting the prop off, run the boat up a concrete slip way at full speed and watch that sucker ping across the car park

R
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Old 23 July 2003, 10:34   #38
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I thought you only did that if you wanted to reduce the diameter
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Old 24 July 2003, 09:19   #39
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Aaaah! Block of wood. Not only is it invaluable for changing the prop - if you trim it properly (npi) it doubles as a base for the trailer jockey wheel when you're decoupling the trailer from the hitch on softish sand on a sloping beach. I love my block of wood.
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Old 24 July 2003, 09:25   #40
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What a clever idea - yet another use for "The Block of Wood" - thanks.

The bl**dy thing will be wanting celebrity status soon

Any more uses folks?
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