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Old 31 August 2013, 03:40   #11
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Incorrect thrust washer and nut?

I have seen thrust washers wear away the front of the gearbox when an incorrect (larger) one has been fitted that doesn't seat correctly on the prop shaft and instead seats on the soft alloy of the gearbox, which dissappears surprisingly quickly. Before use prop nut would have appeared at a glance to be correct.
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Old 31 August 2013, 04:35   #12
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How possible is having the nut switched? Where does engine live?

Is it the difference between a metric and imperial nut?


Could someone have borrowed your prop? Damaged theirs and 'needed' a quick repalcement for a day or wanted to Test a different pitch?

Could someeone have wanted to whip off a prop for some other reason - compare the splines on the hub of a nackered one (theirs) to a good one (yours)?

If they had and had their nut and yours together could they have switched them by accident? Then not noticed when fitting either that one was loose and presumably the other was very tight?

Having left dinghies in sailing club dinghy parks for years I know all sorts of things get borrowed because theirs is broken or because theirs has also been borrowed or someone wants to see if a bigger or smaller XYZ makes them sail better. Somehow people think you wont mind even if they don't know you because they wouldn't mind if you asked them.
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Old 31 August 2013, 04:56   #13
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Have you stripped the propeller assembly apart yet? First thing to do is to eliminate all the possible parts and see what you're left with. Check the nut against the thread on the shaft by hand and see if there's play. If there is, then either the nut has been damaged or more likely the wrong nut has been used.
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Old 03 September 2013, 04:27   #14
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And so,
nut is in one piece, clearance to end of shaft correct, thread's not stripped on shaft or nut.
My thoughts are that somebody's nicked my nut.
The boat's on hardstanding in a marina.
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Old 03 September 2013, 12:12   #15
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If they had and had their nut and yours together could they have switched them by accident? Then not noticed when fitting either that one was loose and presumably the other was very tight?
I could see the scenario happening up to the last: If the wrong nut was barely or not at all engaged on MisterP's motor, his wouldn't have fit at all on the other motor.


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Old 03 September 2013, 13:21   #16
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And so,
nut is in one piece, clearance to end of shaft correct, thread's not stripped on shaft or nut.
My thoughts are that somebody's nicked my nut.
The boat's on hardstanding in a marina.
I was up and down by your boat all last week and I didn't see anyone up there.
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Old 03 September 2013, 13:21   #17
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lol- are you even sure it's your prop, P.? It could have been like that for weeks!
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Old 04 September 2013, 13:43   #18
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Some shister has had a go.
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Old 05 September 2013, 05:29   #19
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“Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth.”
Elementary, my dear Watson.
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Old 05 September 2013, 06:26   #20
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Elementary, my dear Watson.
Yes. Although it was your namesake that put me in mind of it:

“Sherlock Holmes observed that once you have eliminated the impossible then whatever remains, however improbable, must be the answer. I, however, do not like to eliminate the impossible.”
― Douglas Adams, Dirk Gently's Holistic Detective Agency
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