Impeller Frozen! How do I get it off ???

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Sdime272
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Joined: 06 Aug 2016, 18:59

Impeller Frozen! How do I get it off ???

Post by Sdime272 » 07 Aug 2016, 18:27

I have an older large jet pump 1994 with a drop in wear ring sleeve. I took the boot off and The impeller seems to have some corrosion and is stuck on the shaft I tried heat and prying with the wood end of a hammer... I don't want to break the impeller is there any other way to get it to slide off? Thanks in advance any info greatly appreciated!!

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DaleH
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Impeller Frozen! How do I get it off ???

Post by DaleH » 07 Aug 2016, 21:07

Have you tried getting any penetrating fluid in there? Alternate a heat hammer (torch) and rapid cooling with ice, after letting it sit with penetrant.

FYI, a 50-50 mix of acetone to auto transmission fluid (ATF) is THE BEST penetrant you could use ...
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kgrant
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Joined: 27 Jun 2010, 23:49
Location: Fairbanks, Alaska

Re: Impeller Frozen! How do I get it off ???

Post by kgrant » 11 Aug 2016, 00:14

From outboard jets website:

http://outboardjets.com/faqs/how-do-you ... riveshaft/

There is a plastic bushing which centers the impeller on the shaft. The impeller never sticks to the shaft, but the drive key will stick in the impeller. On current design, we use a key with a tee cross section which rests on a flat, milled to the end of the driveshaft, including the thread.The impeller with the key in it will slide off the end of the shaft. Under torque, the key cams itself against the flat on the shaft. It is usually necessary to bump the impeller counter clockwise on the shaft until the keyway is perpendicular to the flat, (centered over the flat). Two 3/4 x 1 1/2 x 12 inch pine levers against the housing flange will slide the impeller off. On earlier designs where the keyway in the shaft traps the key, and it is also stuck in the impeller, it is necessary to drill out the brass key to free the impeller. Use a 3/16 drill in the large series and a 1/8 drill on the medium and small series.

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