Guests - If You want access to member only forums on HSO. You will gain access only when you sign-in or Sign-Up on HotSpotOutdoors.

It's easy - LOOK UPPER right menu.

Sign in to follow this  
Followers 0
Tanda

Yamaha outboard with bent crankshaft..

6 posts in this topic

Hi

I have a new Yamaha 15 HP two cycle outboard that I just broke in. When going through the shallows, I hit something hard enough to instantly stop the motor. There was little (to no) damage to the prop or skag. The engine did start but it ran poorly like it was out of time. Took it into the dealer to have it checked out and it has a twisted drive and crank shaft. The repairs are the price of a new motor.

Is there or should there be some type of safety device to prevent this kind of damage? Besides staying in deeper water....

Some advice would be helpful!!

Andy

Share this post


Link to post
Share on other sites

Isn't that what rubber hub on prop is for? Hard to imagine doing that kind of damage without wrecking the prop.

Share this post


Link to post
Share on other sites

You must have really hit something hard - that stopped the motor cold in it's tracks. The hub will absorb some of the impact - without it you probably would have twisted the splines of the driveshaft off - not much difference in this case, but if it stopped it cold I wouldn't be too surprised. You could give twin city outboard a call and see if they have a parts motor by chance, but I doubt it.

marine_man

Share this post


Link to post
Share on other sites

I actually snapped a driveshaft in 1/2 once, It was a Chrysler 100hp, I was testing it on hose and shifted from reverse to forward without letting the prop stop. It cost me $ 125 and a lot of work.

Check with TC Outboard or Boat Motor Recyclers, hsolist could be a good place too.

Share this post


Link to post
Share on other sites

I think I'd get a second opinion while crossing my fingers that the drive shaft isn't twisted. Are the drive shaft and prop shaft out now? They should be unless the dealer put it back together. Otherwise he couldn't say for sure the drive shaft is twisted.

If the drive shaft twisted then theres damage to the drive shaft bearings, at least.

Being a new outboard, finding a good used lower unit will be hard.

Running rough. when you dead stop an engine by hitting something, its the flywheel thats compounding that force.

The key is most likely crushed, throwing the timing off which explains running rough. You'll have to pull the flywheel and replace the key.

Share this post


Link to post
Share on other sites
Guest
This topic is now closed to further replies.
Sign in to follow this  
Followers 0



  • Posts

    • Went out pheasant hunting today and ran into a trapper setting 330s along a creek for beaver .  I'm not much into trapping but know how these things work, and after having a civilized conversation with him his were all in the water and he let know where they were located so at least the pooch wouldn't get his leg caught in it. don't feel bad, he hasn't caught much either . 
    • That may be, but it sounds a lot like "I didn't get a job" butthurt.  That grifter would be singing the praises of Trump's genius if she was on the payroll.   Eh, why not?  When they aren't taking credit for things they had nothing to do with, they are taking blame for things they had nothing to do with. Pence is still the governor of Indiana
    • sounds like from animals that eat meat. 
    • Huh?  Sorry,  I should have known better.
    • Great idea, have you looked into what it would take? 
    • I think what fish meant was it might not hurt to allow more than 60 days for a season in states like MN.   When the birds are late we can still have a chance at the northern birds.  If freeze up and the flights are early, the longer season won't matter.  There won't be much if anything to shoot.   I get what you're saying about lengthening the gap, but that's a roll of the dice since we have little chance of knowing when freeze up will get those late birds moving.  How long do you make the gap?   After a year in my new area of the state I can adjust my expectations and chase more wisely next year.  This year I was anticipating much better.  I think that's the worst part - the big push being the big let down.
    • Wool socks are a must, they insulate even if wet. Cotton socks in any warm boot will make your feet cold. The warmth of the boot while you are active make your feet sweat. I have the LaCross Iceman from a couple decades ago, still no need to go buy something different.
    • Some wild meat can have trichinosis.  Domestic pork no longer has it. I'm pretty sure that venison doesn't have a parasite issue.
    • With our 60 day flyway limit it's hard to stretch it out. Opener in Northern MN is typically pretty slim on teal since they leave early and by close lots of our deep lakes are still open the past two years. IMO not that it matters, I'd rather see an earlier start with a larger gap. 
  • Our Sponsors