30 HP jhonson w/pictures

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SolRac

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discription of problem .... <br /><br />was cruising top rpm when all of a sudden no more thrust and when given throttle it would just rev up in rpm ... <br /><br />any advice :) <br /><br />thank you <br /><br />solrac
 
W

Walker

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Re: 30 HP jhonson w/pictures

On the trailor with key off, spark plug wires off and motor in gear. Try to turn prop by hand. See if the prop will turn freely without turning the motor. Watch the prop shaft to see if its turning with the prop. What we're trying to find out here is whether your prop hub is spun or whether you broke something like your driveshaft.<br />If the prop is hard to turn and is making everything else turn then you most likely have a spun prop hub.
 
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SolRac

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Re: 30 HP jhonson w/pictures

thats what i thought that i spun the hub .. wasn't sure the tale tell signs ...<br /><br />so i did your suggestion and the prop is hard to move and everything else does move when i turn the prop ...<br /><br />whats the cure ..?? to a spun hub ...<br /><br />
cc5b.jpg
<br /><br /><br />photos of engine ...<br /> http://pg.photos.yahoo.com/ph/solrac1222/album?.dir=/6ba7
 
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SolRac

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Re: 30 HP jhonson w/pictures

do i need a gear puller to remove that hub from the spline shaft ??<br /><br /><br />the one i have is to fat to gent under the base of that hub .... <br /><br />any ideas to the proper size gear puller to use ??<br /><br />thanks you all so much for your help ...
 
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SolRac

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Re: 30 HP jhonson w/pictures

if u get a red x just right click show picture
 
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Xcusme

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Re: 30 HP jhonson w/pictures

It's obvious that you have to remove what's left on the prop sleeve without damaging the drive shaft. It looks like that prop hadn't been removed in a long time, by the looks of the rust.<br /><br />One possible solution is to slide a shaft coupling or shaft collar with the same I.D. as the prop sleeve's O.D. and tightning the set screw(s). Then using the gear puller on the shaft coupling to draw it off of the splined drive shaft. PB Blaster and heat may have to be used too.<br /><br />Here's a link to a site with pics of the shaft coupling and shaft collar. <br /> Link<br /><br />On the left hand side , click on Collars, Shaft Collars<br /><br />I would resist the urge to drive it off the shaft with hammer blows. Damage to the drive shaft, bearing carrier etc. could result.
 
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SolRac

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Re: 30 HP jhonson w/pictures

thank you for your reply Xcusme<br /><br />PB blaster ?? heat applied by a torch ..... <br /><br />no resiting that urge to pound it off .... try-ed a gear puller but ended up striping the threads on the gear puller ....
 
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lark2004

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Re: 30 HP jhonson w/pictures

I would hesitat about using heat at this stage.<br /><br />Try soaking it with a penetrating oil for a week first. Then see if you can remove it useing Xcusme's idea.<br /><br />If that doesn't work and you do end up heating it to try and remove it, you will need to replace the rear gearcase seal as well.
 
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Xcusme

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Re: 30 HP jhonson w/pictures

Originally posted by solrac:<br /> thank you for your reply Xcusme<br /><br />PB blaster ?? heat applied by a torch ..... <br /><br />no resiting that urge to pound it off .... try-ed a gear puller but ended up striping the threads on the gear puller ....
Click to expand...
PB Blaster Link is a "penetrating catalyst" that has worked wonders. Heating is a tricky issue in this case. The object would be to heat the outer part quickly so that it would expand. If more heat is applied it would migrate to the inner drive shaft, causing it to expand as well, defeating the purpose. Hopefully, the rust isn't too deep in the splines (on either end) and she'll break free and slide off. I guess it goes without saying that this is a good case for yearly removal of the prop. Remove any fishing line wrapped around the driveshaft, clean, relube, install, and replace the cotter pin. Good luck and report back on how things turn out.
 
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Walker

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Re: 30 HP jhonson w/pictures

You will need a new hub anyway so carefully take a grinder and grind down one side of the hub til you get it almost ground through. Did I mention "CAREFULLY"<br />Now take a dremel tool and cut it the rest of the way through."CAREFULLY"<br />Once you get one lengthwise cut, it should come off.
 
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SolRac

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Re: 30 HP jhonson w/pictures

OK due to the fact that i need a cpl days for my prop to return with a new hub .... <br /><br />I'm going to try to just soak it for awhile with liquid wrench .. is what i have on hand ......<br /><br />if then that fails ill cut the flange off using the grinder idea ..... <br /><br />just bought the boat like a 6 weeks ago ... used the noat about 5 times before i spun the hub .... is due to say running aground ???<br />thank you all .....
 
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SolRac

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Re: 30 HP jhonson w/pictures

ok i got the shank off with the use of airhammer ... and had it sitting in Pentrating ol for a week <br /><br />now that i installed the new prop ( i decide to buy a ned one vs re hubbing the old one $ it made more sense )<br /><br />now thought i seem to have some play .. is this normal see this picture or click on the gallery link http://pg.photos.yahoo.com/ph/solrac1222/detail?.dir=/6ba7&.dnm=7c6c.jpg&.src=ph <br /><br />
7c6c.jpg
<br /><br />thanks for all the help so far
 
M

MCM

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Re: 30 HP jhonson w/pictures

Hi, it looks like you might be missing your rear prop washer?<br /><br />Mike
 
M

MCM

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Re: 30 HP jhonson w/pictures

Hi, thats the part, the only other thing that comes to mind is thats not the correct prop for that motor, just guessing though. Without knowing the year of the motor, the mfg. p/n & size/pitch of the prop it would be hard to cross reference.<br /><br />Mike
 
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steviecops

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Oct 3, 2003
Messages
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Re: 30 HP jhonson w/pictures

Theres another washer that looks like it's missing. It goes on after the prop and is shaped to fit over the splines on the prop shaft. Usually made out of nylon or some similar material.
 
M

MCM

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Re: 30 HP jhonson w/pictures

Hi, I think you're right, is that it in pic. 13 & 14<br /><br />Mike :)
 
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SolRac

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Re: 30 HP jhonson w/pictures

Originally posted by MCM:<br /> Hi, I think you're right, is that it in pic. 13 & 14<br /><br />Mike :)
Click to expand...
no thts part of the prop assembly as in one pc w/the prop ..
 
M

MCM

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Re: 30 HP jhonson w/pictures

Hi, there should still be a washer front & back. Like steviecops said it looks like its missing. I can't tell from you're pic above if there's a washer there or if thats part of the prop. <br /><br />Like I said before you're either missing a prop washer or thats not the right prop for your motor.<br /><br />Just tyin to help,<br />Mike :)
 
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