Minnesocold Posted June 26, 2009 Share Posted June 26, 2009 Hi guys,Today I was at Prior Lake with my boat. When I was running slow, my boat accidently hit the sand/small rock(1-4 inches rocks), and I shut the engine off right away. After my boat moved away from that shallow area, I was able to start the engine just fine but the propeller doesn't spin. Plus while the engine still running, I also shifted to forward/reverse but the propeller just doesn't spin. Any ideas what was happened on my motor ? Thanks. Quote Link to comment Share on other sites More sharing options...
boatfixer Posted June 26, 2009 Share Posted June 26, 2009 Can you tell us what year and horsepower? Depending on what engine you have, it could be a shear pin, spun prop hub, broken pinion gear or drive shaft, etc... Quote Link to comment Share on other sites More sharing options...
marine_man Posted June 26, 2009 Share Posted June 26, 2009 Sounds like a problem in the lower unit - either a complete failure or a loose connection to the shift rod.Before I would take it in, I would pull the hood off and verify that when you shift the motor on the controls that the connection that the shift cable connects to works.I'd also recruit someone to run the shifter while you rotate the prop by hand... can you hear anything, or does it engage?marine_man Quote Link to comment Share on other sites More sharing options...
jeffreyd Posted June 26, 2009 Share Posted June 26, 2009 I hope your suggestion marine man is to do that with the motor off!.. Could end up having a new nick name if it engages while the engine is on. Nubs or two fingers does not sound that good to me. Quote Link to comment Share on other sites More sharing options...
marine_man Posted June 26, 2009 Share Posted June 26, 2009 Sorry... to be absolutely clear, do the last test with the motor off....marine_man Quote Link to comment Share on other sites More sharing options...
Minnesocold Posted June 26, 2009 Author Share Posted June 26, 2009 boatfixer,it's 25hp evinrude 74'.marine_man,I will give it a try Quote Link to comment Share on other sites More sharing options...
Northlander Posted June 26, 2009 Share Posted June 26, 2009 Hopefully you just spun a hub. Quote Link to comment Share on other sites More sharing options...
Jackpine Rob Posted June 26, 2009 Share Posted June 26, 2009 Sounds like a shear pin. Remove the cotter key and pull the prop off.You probably have 2 or 3 pieces of shear pin that will fall out. You simply slip the shear pin into the hole in the prop shaft, carefully replace the prop and secure with the cotter pin. Sometimes a piece of the pin is stuck in the shaft, but I've never had a problem tapping that part out.That was around the era slip-clutches started showing up, but I recall changing out the shear pins on OMC through about 1976. With a shear pin motor, you should always have a couple of spares and an extra cotter pin taped to the handle of the motor. Quote Link to comment Share on other sites More sharing options...
marine_man Posted June 26, 2009 Share Posted June 26, 2009 On that size motor, yes, it most certainly (and likely) is a shear pin.Good Luck!marine_man Quote Link to comment Share on other sites More sharing options...
Wish-I-Were-Fishn Posted June 26, 2009 Share Posted June 26, 2009 Lucky break if it's just a shear pin. That is what they are made to do. Should always carry spares Quote Link to comment Share on other sites More sharing options...
jeffreyd Posted June 26, 2009 Share Posted June 26, 2009 sorry marine man could not resist the comment/joke about doing it with the motor off. You and i both know of folks that would consider doing it while running and end up with the tips of a couple digits flying off. Quote Link to comment Share on other sites More sharing options...
marine_man Posted June 26, 2009 Share Posted June 26, 2009 But then how would they type their response? marine_man Quote Link to comment Share on other sites More sharing options...
Minnesocold Posted June 26, 2009 Author Share Posted June 26, 2009 thanks all Quote Link to comment Share on other sites More sharing options...
Wish-I-Were-Fishn Posted June 26, 2009 Share Posted June 26, 2009 But then how would they type their response? marine_man With the new prosthetic ones they get from the court settlement Quote Link to comment Share on other sites More sharing options...
jeffreyd Posted June 27, 2009 Share Posted June 27, 2009 well with modern technology and no digits, one could use speech writing i guess. Quote Link to comment Share on other sites More sharing options...
broken_line Posted June 28, 2009 Share Posted June 28, 2009 its most likely a spun hub because that year of jhonsons have a splined shaft so the shear pin would do nothing but hold it on.. Quote Link to comment Share on other sites More sharing options...
Phred52 Posted June 28, 2009 Share Posted June 28, 2009 Wish-I-were and Marine man, Ya, maybe so, but their comments would be cut short, none the less Phred52 Quote Link to comment Share on other sites More sharing options...
marine_man Posted June 29, 2009 Share Posted June 29, 2009 its most likely a spun hub because that year of jhonsons have a splined shaft so the shear pin would do nothing but hold it on.. My exploded views show a shear pin - regardless, check for a spun hub or a sheared shear pin.marine_man Quote Link to comment Share on other sites More sharing options...
Minnesocold Posted June 30, 2009 Author Share Posted June 30, 2009 I've found out that my shear pin was broken. I bought a new one (copper), replaced it and it was broken again after couple hours of testing on the lake, this time I did not hit any rocks or weeds. I think I'm going to buy a stainless steel this time instead. Thanks a lot for your helps. Quote Link to comment Share on other sites More sharing options...
leech~~ Posted June 30, 2009 Share Posted June 30, 2009 I think they are Brass, and putting a harder one in may just cause more damage issues else where in the lower unit? You may want to check that twice with the Mfg. Quote Link to comment Share on other sites More sharing options...
Jackpine Rob Posted June 30, 2009 Share Posted June 30, 2009 Not all shear pins are created equal. You definitely want those suckers to break when they need to - but breaking just because it is under normal load is not good.... If you were to hit a rock or something without a functioning shear pin, you'll probably snap the shaft or something equally awful.Just a little "emergency tip" for you. If you don't have an extra shear pin and are stuck miles from home/landing, rearrange the pieces of the busted shear pin (the center section is different length than the two ends) and put them back in carefully. It does work - at least for a while. Quote Link to comment Share on other sites More sharing options...
boatfixer Posted July 1, 2009 Share Posted July 1, 2009 Make sure there is no slack when you re-install the nut on the end of the shaft. Quote Link to comment Share on other sites More sharing options...
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