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Ding ,on prop? How big before replace?

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Ding ,on prop? How big before replace?

Old 06-26-2008, 05:26 AM
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Default Ding ,on prop? How big before replace?

Hit a rock/mud rock bottom and now have a small ripple on one blade about 1 1/2" long. No missing metal, just a small ripple. My question is how large of a ding before I replace? No change in ride or trim.
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Old 06-26-2008, 06:47 AM
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Default RE: Ding ,on prop? How big before replace?

I would probably opt to recondition before replace a prop. Any good prop shop can recondition a prop to like new condition for much less than the cost of a new prop.
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Old 06-26-2008, 07:16 AM
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Default Re: Ding ,on prop? How big before replace?

Get it fixed.
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Old 06-26-2008, 07:23 AM
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Default Re: Ding ,on prop? How big before replace?

Since you do not have a nick in the blade if you handy with a file just file it down to get it smooth. If it is stainless good luck, alum. is easy just look at the contour of the blade. This is done quite often on aircraft props.
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Old 06-26-2008, 07:24 AM
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Default Re: Ding ,on prop? How big before replace?

Tom W Clark - 6/26/2008 6:16 AM

Get it fixed.
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Old 06-26-2008, 09:00 AM
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Default Re: Ding ,on prop? How big before replace?

Tom W Clark - 6/26/2008 10:16 AM

Get it fixed.
As somebody who is on a first name basis with the local prop shop, I concur with the above. Get it fixed. A good prop shop can normally make them as good if not better than before after a recondition.
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Old 06-26-2008, 10:12 AM
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Default Re: Ding ,on prop? How big before replace?

get it fixed and have them adjust it to get the best performance for your boat while they are doing the repairs
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Old 06-26-2008, 10:16 AM
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Default RE: Ding ,on prop? How big before replace?

I hit a rock with my stainless steel prop and put a 3" curl on one of the blades. A local Prop Shop guy fixed it good as new for under $150.

Can't tell it was ever fixed.

Much better than replacing prop.
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Old 06-26-2008, 12:15 PM
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Default Re: Ding ,on prop? How big before replace?

I knocked a chunk out of my prop. Maybe 1/2" X 1 1/2" on the edge of one of the three blades. I just ignored it. So far so good.
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Old 06-26-2008, 12:47 PM
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Default Re: Ding ,on prop? How big before replace?

I have the same issue, local shop told me (with an aluminum prop) that it is darn near as much to "recondition" a prop as it is to buy a new one. Got a 225 yamaha and a new prop (cheapy) is slightly over 100 bucks i think. Whats a "recondition" cost?
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Old 06-26-2008, 01:14 PM
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Default Re: Ding ,on prop? How big before replace?

An aluminum prop costs only about $100-$150. A single blade repair will cost about $100. But why on earth would anybody who owns a $15,000 outboard put a cheap aluminum prop on it?


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Old 06-26-2008, 01:18 PM
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Default Re: Ding ,on prop? How big before replace?

I knocked a chunk out of my prop. Maybe 1/2" X 1 1/2" on the edge of one of the three blades. I just ignored it. So far so good.
It might *seem* OK, but anytime you remove material or distort part of one blade, the propeller is working in an out-of-balance condition. Reason NUMBER ONE why gearcases go bad is out-of-balance propellers.

Modern outboards are marvelous things. While they *can* withstand a lot of use and abuse, running a prop with a big chunk missing definitely qualifies as "abuse".

Get it fixed.
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Old 06-26-2008, 02:03 PM
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Default Re: Ding ,on prop? How big before replace?

This was my reply to a previous thread...........

I agree about props if they are counter rotation motors. My neighbor has yammie f150s and got equal fuel burn for quite some time. One day his anode on the bottom of the cavitation plate that offsets prop rotation vibrated loose and hit the prop on its way to the gulf floor. He saw the missing anode and replaced it the same week, he inspected the the prop and saw a very small nick and didn't think twice about it. For some time he noticed a 20% increase on the nicked prop motor. Due to the nick being so minor we thought no way this was to blame and changed plugs, filters, etc. Finally after no improvements he broght the props in to be machined. The outcome was awesome, equal fuel burn once again, even though the prop showed very, very minor damaged it was unbalanced and caused a very significant increase in fuel burn. (20%) This makes wonder how many single engine rigs are running around with the same issue and have nothing to compare to? It made me a firm believer in a prop being "true".
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Old 06-26-2008, 02:30 PM
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Default Re: Ding ,on prop? How big before replace?

jmsavoie - 6/26/2008 5:03 PM

This was my reply to a previous thread...........

I agree about props if they are counter rotation motors. My neighbor has yammie f150s and got equal fuel burn for quite some time. One day his anode on the bottom of the cavitation plate that offsets prop rotation vibrated loose and hit the prop on its way to the gulf floor. He saw the missing anode and replaced it the same week, he inspected the the prop and saw a very small nick and didn't think twice about it. For some time he noticed a 20% increase on the nicked prop motor. Due to the nick being so minor we thought no way this was to blame and changed plugs, filters, etc. Finally after no improvements he broght the props in to be machined. The outcome was awesome, equal fuel burn once again, even though the prop showed very, very minor damaged it was unbalanced and caused a very significant increase in fuel burn. (20%) This makes wonder how many single engine rigs are running around with the same issue and have nothing to compare to? It made me a firm believer in a prop being "true".
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I've witnessed this as well. Many people say "Oh well it's just a nick, how much can it affect my efficiency?" Well at $4+ a gallon it costs you a small fortune pretty quick by not keeping your prop in good condition.
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Old 06-26-2008, 04:00 PM
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Default Re: Ding ,on prop? How big before replace?

Tom W Clark - 6/26/2008 1:18 PM

I knocked a chunk out of my prop. Maybe 1/2" X 1 1/2" on the edge of one of the three blades. I just ignored it. So far so good.
It might *seem* OK, but anytime you remove material or distort part of one blade, the propeller is working in an out-of-balance condition. Reason NUMBER ONE why gearcases go bad is out-of-balance propellers.

Modern outboards are marvelous things. While they *can* withstand a lot of use and abuse, running a prop with a big chunk missing definitely qualifies as "abuse".

Get it fixed.
Tom, at first I wanted to get it replaced or fixed. But my dealer told me not to worry about it. He services a lot of boats that are in oil service, and even more that are in commercial fishing use. He told me that my damage was nothing compared to what he sees on a daily basis... especially props on oyster boats.

I'm still not convinced I should ignore it. I was pressure washing my boat the other day. Decided to get the prop spinning fast with the water from the pressure washer. Got it spinning extremely fast, and prop seemed to be wobbling to me... while the prop shaft was perfectly balanced. I called a prop shop and they told me that all props wobble a bit. I'm honestly not sure who to believe. But if my prop shaft seals go bad, I do know who I'm going bring it to... the dealer who said not to worry about it.
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Old 06-26-2008, 05:03 PM
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Default Re: Ding ,on prop? How big before replace?

Its true if you spin a prop, the hub will sometimes appear to wobble a little. Props aren't as perfect as we would like them to be. Thats not a big deal

If its just one blade and doesn't require welding its not going to cost much to fix.

I'd spend a couple bucks now and get it fixed just for "insurance". It would be a pain in the butt if your seals or gearcase goes to hell because of something that might cost 40 or 50 bucks to have fixed.
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Old 06-26-2008, 05:41 PM
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Default Re: Ding ,on prop? How big before replace?

A not-so-good prop shop can make a prop look like new without it performing like new. I won't pay to have any aluminum prop repaired or rebuilt.

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Old 07-09-2008, 08:54 AM
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Default RE: Ding ,on prop? How big before replace?

sorry to reply so late. Did someone say " why would you put an aluminum prop on a 15k dollar outboard"? What the heck difference does it make? My understanding is that a SS prop that costs 4x as much doesnt really have much more to offer. I mean, its definitely stronger, but I would rather my prop bend that something else bend! Is there some huge advange (other than shinyness) to non aluminum props that we are unaware of. Is there a mileage difference or something tangible for the everyday boater? Buying a new alum prop costs about the same as an oil change (marine oil change).
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Old 07-09-2008, 10:49 AM
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Default Re: Ding ,on prop? How big before replace?

-for tnsmith.... Get another dealer! He is correct about commercial rigs that will re-damage a repaired prop within a week or two-- but that's hardly an ideal situation. Without having met your dealer, I'll wager that his memory of that advice he gave you won't be very good if you eventually file a warranty claim....

Seriously, get your prop re-conditioned (replaced if it's a cheapie and the cost is hardly more than the re-condition.) . A decent SS prop can be re-conditioned over and over again. It can also touch something with little effect that would tear up an aluminum prop. The downside is that the SS prop will transmit a greater shock to the drive train in an impact than the aluminum one will... Even a slight ding in one blade of prop will effect rpms, and may cause enough problems to "work" your drive train a lot harder than you ever intended to. Serious prop damage is very noticeable, if the damage is small you won't notice it - but that doesn't mean it isn't a problem.... Good luck.
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Old 07-10-2008, 06:44 AM
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Default RE: Ding ,on prop? How big before replace?

bigmig19 - 7/9/2008 8:54 AM

Did someone say "why would you put an aluminum prop on a 15k dollar outboard"? What the heck difference does it make? My understanding is that a SS prop that costs 4x as much doesnt really have much more to offer. I mean, its definitely stronger, but I would rather my prop bend that something else bend! Is there some huge advange (other than shinyness) to non aluminum props that we are unaware of. Is there a mileage difference or something tangible for the everyday boater? Buying a new alum prop costs about the same as an oil change (marine oil change).
Would you put retread tires on your new car to save a couple hundred bucks? You apparently do not understand. A stainless steel propeller can cost two or three times as much as an aluminum propeller but they are probably cheaper in the long run. A stainless steel propeller will offer better fuel mileage, faster acceleration, better grip and higher top speed. They will be FAR more durable as well.

A stainless steel propeller is five times as strong and that means that damage that will destroy an aluminum prop often won't do a thing to a stainless steel prop. I my youth I mangled numerous cheap aluminum propeller here on driftwood infested Puget Sound but in thirty years of boating and ownership dozens of outboard motor, sterndrives and boats I have bent a stainless steel blade exactly once. That prop was repaired and is in service today.

As to the old wives' tale of an aluminum prop protecting your motor, consider that ALL propellers for outboards and sterndrives have hubs that are designed to let go before any damage to the motor occurs. Yes, we can find instances where lower unit damage occurred from a prop strike but you cannot find instances where the same damage might not have occurred with an aluminum prop.

I will concede, however, that aluminum props are advisable for those who plan to drive their boats onto the rocks.
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