Mercury model 40

[seagull764]

I have a model 40 that I need to replace the impeller , the drive shaft is rusty so I cleaned as best I could .

but the impeller is in the cup I cannot find a way to grab it or pry it out

anyone have an idea ?

 

[crosbyman]

try some lubricant    WD 40    release-all   etc… small impeller should not be hard to extract … freeze it  or heat  it up… something will give.

Joining AOMCI has priviledges 🙂

[seakaye12]

I have had to drill them out or chisel them out.  The area of the core where the key fits is the thinnest (and weakest) point.  It’s not too bad once you start working on that area.  The core will break and widen slightly.

[crosbyman]

I have used  snowblower  telfon  spray  with great success … it is water thing slippery   anda sidetap with  punch should loosen thing  enough.  if not  cutting it  will surely work

Joining AOMCI has priviledges 🙂

[seagull764]

Thanks I finally got it out using a dreamel with a grinder end .
I have a new question has anyone built a starter to use with a drill , or any kind of rope pull to fit the motor without the cowl ?

[crosbyman]

a simple drill with  a sochet adapter   for  the size of th nut should turn it  over  . don.’t use an impact 1/4 inch drive so as to not screw down the bolt  on the fw.

https://www.amazon.ca/Sockets-Adapter-Extension-Reducer-Adpater/dp/B0B29G629K/ref=sr_1_8?crid=1LOK4JI7L1DMJ&keywords=impact+driver+to+socket+adapters&qid=1703726504&sprefix=impect+driver+to+socket+adapters+%2Caps%2C82&sr=8-8

 

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[seakaye12]

You have to wonder what the Mercury engineers were thinking when they designed that cowling with the recoil starter built-in.  Remove the cowling and you have no starter. Sheesh.

With a small engine like your 4HP….a simple adapter like is mentioned by Crosbyman will work fine.  Or you can find a suitable rope pull from some old engine and adapt it.  The picture I have shows one from an old Scott Atwater 3.6HP but there are many others that will work .

Or….you can buy a custom starter with a built-in over-running clutch.  There are adapters available for your electyric drill that would provide the added safety of the clutch.  A bigger concern with larger engines though.  Not so much for your 4HP.

https://www.grubee.net/products/cw-ocdt-overrunning-clutch-drive-tool-for-engine-left-side-magneto-nut-cranking

https://www.bbtstarters.com/aboutus1

[seagull764]

Thanks for the answers , that overrun clutch looks good to me .

my next question is , I have to replace the wires that run from the stator to the coil they are Nola , the insulation looks pretty thick does anyone know the gauge and insulation type that is ?

[crosbyman]

wire strands likely OK  just brittle  insulalion

why not cut at a good spot.. off set the cuts  by 1-2 inches  …

backslide some heat shrink tubing both ways with  a final piece of tubing backslided over  the 2 wires and then positionned across the joints

or apply lots of liquid tape

 

don’t forget to  clean out the lower GC cavity of  sandy crud and open up the drain hole !

Joining AOMCI has priviledges 🙂

[seagull764]

Thanks for the suggestions,but the wire is so far gone I’m not sure the shrink is enough for the voltage , auto spark voltage is in 20 kv and up.

idk what outboards are

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