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How do I separate a stuck lower unit on a 1984 25hp Evinrude?

I bought a boat with a 25hp Evinrude that appears to have not been maintained. I want to replace the water pump and maybe some other seals, but cannot get it to drop. I've squirted PB Blaster on the main bolt for weeks and still not budging. Hitting it with large rubber mallet is getting me nowhere. Saw a YouTube where the guy stood his motor upside down and pumped an entire can of degreaser into the housing to free up a stuck drive shaft spline. I also had a guy tell me that I needed to heat the bolt area really hot, but I only have a propane torch, no acetylene. Any ideas?

Posted by nw_zfan on

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4 Related Answers

fordexpert

  • 5692 Answers

SOURCE: 1975 75 hp evinrude water in lower unit

You could take off the lower unit and leave the boat home. All they need is the bottom. The propshaft seal can be cut from fishing line. There should be another seal on the shift assembly and a third on the powershaft. Some you could do, but the shop can pressure test before and replace only what you need. Then pressure test after the repair to verify it seals.

Posted on Jul 20, 2009

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thomasnee

  • 677 Answers

SOURCE: water pump empeller replacing 1960 40hp

On an old motor,the problem will be that the shaft that runs from the crankshaft to the g/box may have frozen .The shaft has a splined fitting that goes into the bottom of the crankshaft.These have a habit of fusing together.It can sometimes be a problem to get them apart.1st try is to unbolt the power head and put some gentle heat onto it.The fused part (bottom of the crank).2nd is to turn the crank and with a soft striker(eg copper or zinc shaft)striking it all the way around the fused point,maybe 10 or 20 times.Then try the heat again.Its a long process but cheaper than having to buy new stuff. Hope this helps

Posted on Jul 23, 2009

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Derek McCrory

  • 3 Answers

SOURCE: Fan pulley nut won't budge

it may be reverse threaded

Posted on Aug 11, 2012

emissionwiz

Marvin

  • 85239 Answers

SOURCE: REPLCING WATER PUMP ON 88HP EVINRUDE

You may have this posted in the wrong product category. Please select another category appropriate to the problem and re-post the problem so the correct expert will see and respond to the question..

Posted on Sep 10, 2012

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85 40hp evinrude stuck in forward?


Evinrude used a shift mechanism located in the lower unit that is actuated by a rod up to the linkage in the motor housing. It could be stuck anywhere along the way or the gear that shifts on the shaft could be immobile due to rust and corrosion.
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You may want to find a blowup of your exact model via a Google search. Then starting from the top look for your problem. be sure to mark the position of anything adjustable so you can at least get it back to the original position when you reassemble it.
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1975 75 hp evinrude water in lower unit


You could take off the lower unit and leave the boat home. All they need is the bottom. The propshaft seal can be cut from fishing line. There should be another seal on the shift assembly and a third on the powershaft. Some you could do, but the shop can pressure test before and replace only what you need. Then pressure test after the repair to verify it seals.

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