spun prop, i don't think so

spitz666

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Apr 18, 2003
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someone else suggested maybe drive shaft splines are bad?or bevel gear to drivshaft connection?is this a posability if so do i need special tools to disassemble to check the splines geaers in liwer unit or can i fudge it with regular tools? i had a prop shop check my props i have 3 now.,1 new ,the 1 that was on it and the spare they said they were fine. also maybe someone knows where i can have a force serviced in the hudson valley area of new york having a hard time. any help is appreciated
 

OBJ

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Dec 27, 2002
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10,161
Re: spun prop, i don't think so

Hey spitz....<br /><br />From the sound of your post the prop is not turning? Would like a little more info if possible. Will it shift into gear? If you shift into gear and turn the flywheel by hand, will the prop turn? Taking the lower unit apart is not difficult. A good tool box is a help. Also a manual, OEM or generic would be a huge help. What make engine, hp and year do ya' got?
 

spitz666

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Apr 18, 2003
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Re: spun prop, i don't think so

the prop turns,its fine at idle anslow speeds but when i go to give it more throttle to take of the engine races but the boat doesnt go any faster.its an 86 forse 50hp on a 86 bayliner 14' runabout(capri)im goin down to mark the prop and see if they stay in line and check the cavitation plate height. but any other info would help.i have it in the yaght club for stripper season but only for 6 weeks so im in a bad spot. thanx guys
 

OBJ

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Dec 27, 2002
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10,161
Re: spun prop, i don't think so

Not knowing how long you've had the rig, let me axe a question or two. When accelerating, is the engine trimed all the way down if equipped with trim and tilt? If there is no TNT, is the tilt pin set way out? Cav plate, rule of thumb, no more than an inch below or above the boat keel. Even with keel is OK. If you have a manual, check the shift rod adjustment. Will the same thing happen in reverse gear? I mean will it power up in reverse?
 

12Footer

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Mar 25, 2001
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8,217
Re: spun prop, i don't think so

It is a spun out hub. But don't take our word for it.<br />Last advice; Do what Rickdb1boat sugjested you do ,which was ----- ". Nothing to slip inside the gear housing that wouldn't make some bad noises if it were. Scribe a mark on the prop hub and the prop housing and take it out for a run. When you pull it back out, check to see if the marks still line up. If not, the hub is still slipping. It wouldn't be the first time a hub was not installed correctly from the manufactuer. "<br /><br />Force 50HP props, in case you haven't been thru "the search" for replacements, are rare, and rarely can you find one other than stock, or stock pitch/dia. You can have one custom-hubbed, but there is generally speaking, no point. The reason there is the one pitch/diameter for your engine is just the best for the motor's capabilities to develop trust, regardless of the hull it pushes.<br />In the real world, of course, there are exceptions. Some try to ski using this engine, (which is fine, on a small boat like the Bliner1400).<br />But they simply don't hold-up well to "hole-shots", or hitting an obstruction. They do what they were designed to do, all too easily.But given the limitations of the Chrysler L/U, it is for good reason.<br /><br />These stock props are notorious for spinning-out.<br />The boat I got from my brother used to spin out hubs often, when he had it (1989 Bliner Capri 1650,purchased new).<br />Since I've personally owned this boat since 2000, I've only had to replace the hub once, and that was my fault. But then, I rarely tromp it. And I do a lot of idling due to my favorite fishing grounds now residing dead-center of a stinking, zealot-dictated, stricktly-enforced manatee idle zone.... But that's another story :eek: <br /> <br />But don't belive me. Do a search here, and you'll find it's a common problem with outboards, and even more prevailent in the Force 50HP, pre-1994, with the Chrysler-designed lower unit.<br />So make a mark accross the hub,donut,spline socket,and prop hub housing. Let it dry. Take it out and run it. It will no longer line-up when you bring it back, or I'll buy you a coke.<br />(Disclaimer...You gotta come pick it up, They call coke shipments ileagal these days)
 

OBJ

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Dec 27, 2002
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10,161
Re: spun prop, i don't think so

Now that's something I didn't know about those particular props 12footer. Thanks for the info. I'll keep it stored in the think tank for future reference. Don't know for sure but maybe might get a close prop from iboats or Michigan Wheel??
 

12Footer

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Mar 25, 2001
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8,217
Re: spun prop, i don't think so

Sure Jim, you can. You can get any prop (esspecially from Michigan wheel) at any pitch/dia you desire. but you must custom hub it for the 50HP. They sell the spine sockets also, in brass only.The only factory prop however, is the 11.-something, available in alluminum or stainless. But they both are pitched the same and have the same diameter.
 

spitz666

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Apr 18, 2003
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Re: spun prop, i don't think so

ok i just scribed the prop and took it out for a spin. marks are still lined up. cav plate is even w/ bottom of boat. the boat has a standard transom. ive tried the engine in every position except the top hole which has the engine latch in it. the prop i just put on is a michigan wheel 10 3/8" x 12 1/2" pitch. this is what my manual called for. it looks the same as the other 2 i have. ive had them all tested by a prop shop and they say they are good. it appears that i am missing the exhaust snout, there is just a hole where the plate was with the bolt. is this a problem???
 

OBJ

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10,161
Re: spun prop, i don't think so

OK spitz.....<br /><br />Will the engine power up in reverse? Have you check the lower unit gear oil for metal or water? Aside from the posts 12footer has posted, and your sure the prop is OK, and the shift rod adjustment is correct, the only other thing would be a trashed gear train or broken drive or prop shaft. Keep postin' spitz....
 

rickdb1boat

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Jan 23, 2002
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11,195
Re: spun prop, i don't think so

Long shot here. Is that a pin drive prop?? Missing Shear pin could be the problem.<br /><br />{Edit} Looks like a spline drive. Never Mind.
 

spitz666

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Apr 18, 2003
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Re: spun prop, i don't think so

it goes in forward and reverse at slow trolling speed.i marked the inside of the prop brass ring and outside and they didnt move. i changed the gear oil aweek ago but didnt check for metal it was alittle mily looking. new seal? i havent checked the shift rod. thats inside the motor leg cover? could that be it?
 

rickdb1boat

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Jan 23, 2002
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11,195
Re: spun prop, i don't think so

i marked the inside of the prop brass ring and outside and they didnt move.
Did you mark the ring and the housing? Inside of ring and outside of ring won't get it. You are looking to see if the "ring" is moving independently of the prop housing.
 

rickdb1boat

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Jan 23, 2002
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11,195
Re: spun prop, i don't think so

If all that failed, it's time to tear down the LU and see what's going on. Drain and Check the fluid for metal chunks.
 

Walker

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Jun 15, 2002
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3,085
Re: spun prop, i don't think so

it appears that i am missing the exhaust snout, there is just a hole where the plate was with the bolt. is this a problem???
I'm not familiar with your particular engine, but if exhaust is being expelled into the prop blades that could surely be your problem. Ventilation.
 

roscoe

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Oct 30, 2002
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21,751
Re: spun prop, i don't think so

The exhaust snout is to direct the exhaust(air) away from the prop. Otherwise the water will be blown away from the prop and the prop won't have any water to grab onto.
 

spitz666

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Apr 18, 2003
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Re: spun prop, i don't think so

ok i think i know the problem, while messing w/ the prop i noticed that the exhaust vent cover is missing i believe this is the problem.exhaust is pushing away the water so prop has no thrust. could this be it? anyone know where i can locate such an item or if i can rig it somehow
 

spitz666

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Apr 18, 2003
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Re: spun prop, i don't think so

thanx, i just got done ordering it fom that page,its the same as my manual so im crosing my fingers this works. thank you all for youre time and knowledge you were very helpful. <br />thanx, <br /> bruce
 

jim dozier

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Jan 8, 2003
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Re: spun prop, i don't think so

I was thinking that based on your forum name that satan was doing his bidding (666) again. Glad to see that wasn't the case.
 

ob

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Aug 16, 2002
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Re: spun prop, i don't think so

Nice catch Walker.I hope missing exhaust snout is what the problem turns out to be.
 
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