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Do I need to check anything after I lost by prop blade?

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Old 06-01-2004, 06:33 PM
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Default Do I need to check anything after I lost by prop blade?

As you guys know I threw a blade off my merc 3blade cleaver. Should I have anything checked out before I put the new one on and run it? Its a merc 300x with about 35 hours on it.

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Old 06-01-2004, 07:27 PM
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Default Re: Do I need to check anything after I lost by prop blade?

I would check for a bent propshaft because of the imbalance. Not sure how touchy outboard shafts are, but I've seen MC6 propshafts bent after throwing a blade.
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Old 06-01-2004, 11:00 PM
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Default Re: Do I need to check anything after I lost by prop blade?

What hull type? How long was it run this way? If your running a tunnel
1 Blade runs out the water at high speeds anyway.I always check prop shaft
true just for the hell of it.Can't over do maintenance or inspections.
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Old 06-02-2004, 06:20 AM
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Default Re: Do I need to check anything after I lost by prop blade?

They are right. Check the prop shaft. They can be straightened and also remanufactured at a local tool shop since you already have a model.

Once the shaft is bent it is out of harmonic balance and the whipping action on a cleaver is tremendous. It will also require new berarings, races etc.

Oops! Here is your missing blade!

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Old 06-02-2004, 09:10 AM
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Default Re: Do I need to check anything after I lost by prop blade?

My 1" shaft was OK after throwing the blade.
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Old 06-03-2004, 11:26 AM
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Default Re: Do I need to check anything after I lost by prop blade?

It is on a 30ft Spectre and I ran it for about a minute or two. Should I just put a straight edge on it. What about the seals?

Thanks alot guys.
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Old 06-03-2004, 12:11 PM
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Default Re: Do I need to check anything after I lost by prop blade?

If you take it to a machine shop they can do a "TIR" or a total indicator runout. This reading tells how far out of "truly being straight" the shaft is. Again they can be straightened.

Rolling it like a cue stick on a seemingly flat surface does not tell the whole story.
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Old 06-03-2004, 12:17 PM
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Default Re: Do I need to check anything after I lost by prop blade?

take the drive down, check and mag everything...look very close at bearings and races....at the very least you'll have labor and seals in it...WAY CHEAP insurance...our #1 cause of drive failure is prop issue(s).
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Old 06-03-2004, 01:03 PM
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Default Re: Do I need to check anything after I lost by prop blade?

I think the tollerance is less than 10thou. There is no way you will see that with a straight edge. Just run down to your local dealer and have them measure the run out. It's really easy to do. Less than 10 minutes per drive including setup.
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