[SEL] Question re tapered gib keys

[frank skinner]

Brad & the Engine guys;

For years the Tugboat & Shipyead guys { that know of it }

have used Devon Steel Putty as a fix for wobbled out key 

ways in propellers & bad tapers on the shafts { as a result of 

loose keys}. I my self used it with great success after a huge 

clunk going from Fwd to Rev on my tug.

It was a 74" Dia. propeller & a 1 " Key.

Devcon also makes a liquid steel vers the putty version,

for smaller applications with less clearence.

This stuff makes an "OK" fit perfect & a bad fit, just fine.

 

                 B, Rgds

        Franklin S. Skinner 
    Marine Surveyor & Consultant 
3428 Talon Court Wilmington NC 28409 
       34'10.9 North 74'52.4 West 
PH 910-791-8870 Cell 910-612-7470



 
> From: bsoward at bigpond.net.au
> To: stationary-engine at oldengine.org
> Subject: Re: Question re tapered gib keys
> Date: Wed, 16 Sep 2009 20:13:14 +1000
> 
> G'day Jerry
> 
> <after the last run there is a bit of play - I can rock the flywheel back
> and forth, not much but enough to get a "click, click" sound - this may be
> the "knock" I heard previously!>
> 
> This will be enough to cause the flywheel to continually work loose. The old
> way to repair this was to obtain some key steel larger than the current key
> and file up a replacement with a "step" big enough to securely locate the
> flywheel keyway while still fitting the existing slot in the crankshaft.
> Very time consuming, but low on the out of pocket expense scale. You do need
> to have some skill as a 'fitter' to get a good result though. If it was mine
> I would go the 'Loctite' route. There are numerous products on the market
> and only a few are suitable for a job of this type, so some advice from your
> local bearing supply house or engineering supplier would be a good idea.
> These things tend to be relatively expensive for a small amount of product
> and you want to get it right first time, so follow any instructions closely!
> :-) Best of luck. <grin>
> 
> Regards from Oz
> Brad Soward
> Nimbin, NSW. Australia
> 
> 
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