prop stuck

mike12

Seaman Apprentice
Joined
Aug 4, 2004
Messages
32
hi, need your help. i have a 1973 7.5 merc. i have been trying to get the prop off. i removed the prop nut and rear thrust hub without much trouble but can't get prop to come off. i soaked it with kroil penetrating oil overnight and it still won't budge.i've used a block of wood behind the prop and a mallet. any suggestions would help. Thanks
 

dajohnson53

Lieutenant Commander
Joined
Apr 28, 2004
Messages
1,627
Re: prop stuck

I posted about getting a stuck prop off of a similar vintage motor (a '74 9.8 hp). Read this link to get the down and dirty:<br /><br /> My old post on stuck prop removal <br /><br />A couple of points that might make it feel better for you:<br />If you ruin the old prop when removing it, a new one won't be very expensive - probably less than $75. <br /><br />Take the motor into a tool rental place and find a wheel puller that will fit it. That will make your job easy and quick. On the other hand, if you pull it off, it's very likely you'll either ruin the prop or at least need to have it re-hubbed. Given the cheap price of a new one, re-hubbing is probably not a cost-effective option. Therefore, you'll probably end up buying a new one. Therefore, therefore ;) you might want to just go straight to simply cutting it off rather than messing with a wheel puller. That's what I'd do if I were to do it over again with my engine.
 

mike12

Seaman Apprentice
Joined
Aug 4, 2004
Messages
32
Re: prop stuck

thank u for your rely it really will help!! looks like i have a job ahead. thanks again. i'll get started again today. mike12
 

andrewkafp

Lieutenant Commander
Joined
Mar 15, 2003
Messages
1,668
Re: prop stuck

Mike <br />Have you tried removing the L/U for W/P service ?<br />The reason I ask is that if the prop has been neglected, it's possible that the L/U may be seized tO the flywheel. No SS here.
 

dajohnson53

Lieutenant Commander
Joined
Apr 28, 2004
Messages
1,627
Re: prop stuck

RE: cutting since I recommended it (see my post on the ordeal I had removing an old prop, and the cheapness of replacing it), and KCLOST agreed....<br /><br />I've been using my Dremel tool, with various cutting attachments a lot the past couple of years. The cheap, disposable cutting wheels do a pretty decent job of cutting aluminum, especially light weight, thin stuff. There's probably better ways to do it, but the Dremel is easy to control, and since I have a package with about a bazillion little abrasive metal cutting disks, I use it. (these are minature versions of the abrasive cutting blades you can buy for cutting metal with a skill saw) There are also many varieties of other grinders and cutters for the dremel - some of the cutters essentially look like overgrown dental bits and/or drills - so it's pretty easy to cut in small places. It was easy to cut stuck parts off the prop shaft without damaging the shaft itself. There's a clear change in "feel" from the metal inner hub to the shaft itself - easy to stop cutting at that point without damaging the shaft.<br /><br />You could also probably hacksaw to start, finish with the dremel if necessary. The rubber hub part can be cut through with a utility knife.<br /><br />It bears repeating, the replacement prop for this kind of motor is pretty cheap and readily available at any merc. dealer. The one I got turns out is a better match for my kicker application anyway so it turned out to be a good deal all in all). Just flogging the dead horse that one shouldn't spend a lot of time trying to salvage a stuck prop in a case like this - unlikely you'll be able to, and cheap to replace with probably a better unit anyway.
 

locknut550

Cadet
Joined
Apr 17, 2004
Messages
22
Re: prop stuck

ive got a 1981 7.5 merc. i had the exact same problem, i ended up pulling the prop off the hub. i sent it to dans prop shop he rehubbed it for 35$and it was as good as new, alot cheaper than buying a new one. hes got a website with the details.whatever you decide whenever you put your fixed prop back on coat the splines of the prop shaft with antisieze,you wont have that problem again.
 

accord_guy

Seaman
Joined
Aug 31, 2004
Messages
68
Re: prop stuck

I used some rope and a harmonic balancer puller. <br />Tie the rope around the prop as well as you can<br /> and loop thru the holes on the puller and center the puller punch in the indent on the end of the shaft. It worked like a charm and didn't hurt the prop at all.
 

dajohnson53

Lieutenant Commander
Joined
Apr 28, 2004
Messages
1,627
Re: prop stuck

Originally posted by locknut550:<br /> ive got a 1981 7.5 merc. i had the exact same problem, i ended up pulling the prop off the hub. i sent it to dans prop shop he rehubbed it for 35$and it was as good as new, alot cheaper than buying a new one. hes got a website with the details.whatever you decide whenever you put your fixed prop back on coat the splines of the prop shaft with antisieze,you wont have that problem again.
Since I'm the one who said it was probably not cost effective to get it re-hubbed, I was interested to hear locknut's actual experience - thanks. My situation involved shipping, which I always forget doesn't apply to everyone!
 
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