Prop shaft

The propeller on your boat has a big impact on the performance of your boat. This is the place to discuss this subject.

Prop shaft

Postby bwgoodwin » Mon Aug 19, 2013 10:44 pm

The other day I was spinning the prop by hand and it looks as though the prop shaft is bent. No telling how long it has been like this, I know the previous owner had hit a couple rocks and the skeg has a couple chips in it. The boat does not have any weird vibrations or noises. I read that the tolerances are way low and it's cost effective to just buy a rebuilt lower with a warranty.

Should I worry about it and change it or keep gambling?
2005 Sea Ray 220 SunDeck
1999 209LS, Merc. 5.7L, Alpha I -SOLD
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Re: Prop shaft

Postby buyfire » Tue Aug 20, 2013 12:13 pm

I had a propshaft replaced a few years ago. I believe it cost about $8-900 with labor. Better that than replacing an entire lower.
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Re: Prop shaft

Postby bwgoodwin » Tue Aug 20, 2013 5:11 pm

how bad was yours bent?
could you feel vibrations or hear noise?

the unit is $750 and a 3 year warranty, not sure what the shop warranty would be on just replacing the shaft
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Re: Prop shaft

Postby buyfire » Wed Aug 21, 2013 10:46 am

Yes, there was mucho vibration. The only noise it made was when I hit the submerged tree. :lol: I never took it above idle speed, just limped her back to the dock. I'm assuming the $750 is for a used lower? A new propshaft was around $400, if I remember correctly. The rest was labor.
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Re: Prop shaft

Postby bwgoodwin » Wed Aug 21, 2013 2:01 pm

http://www.sterndrive.cc/mm5/merchant.m ... Sterndrive

local shops recommend this route as it comes with the 3 year warranty
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Re: Prop shaft

Postby HOT PURSUIT » Thu Aug 22, 2013 9:19 am

It may look off a bit when you spin by hand. No vibration or noise? Ain't broke don't fix it! OR, have a shop look at it B4 spending $ needlessly :o

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Re: Prop shaft

Postby bwgoodwin » Thu Aug 22, 2013 3:40 pm

yea it just looks off when spinning by hand. no noise, no vibration. its a big boat though

i think i might have the shop measure it in the winter, i have BoatUS, so if the lower unit goes i get a free tow back in and get moneys worth on BoatUS
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Re: Prop shaft

Postby m_snow » Sat Aug 24, 2013 12:12 pm

Just another thought - I've seen many props that are "cast" out of round. I'd check the shaft for bends by running the boat on the muffs with the prop off. You'll be able to see an bent shaft while it's running and in gear.

BTW, I ran an uneven 4 blade SS prop for 3 years before it finally broke (split.) Was a great prop.
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Re: Prop shaft

Postby buyfire » Sat Aug 24, 2013 12:56 pm

m_snow wrote:Just another thought - I've seen many props that are "cast" out of round. I'd check the shaft for bends by running the boat on the muffs with the prop off. You'll be able to see an bent shaft while it's running and in gear.

BTW, I ran an uneven 4 blade SS prop for 3 years before it finally broke (split.) Was a great prop.


You can also just press a cordless drill with a 1/2" drill bit into the recess @ the propshaft center. That's how I was able to tell how badly mine was bent.
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Re: Prop shaft

Postby HOT PURSUIT » Sat Aug 24, 2013 11:19 pm

EXCELLENT IDEA buyfire :lol:

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Re: Prop shaft

Postby taffy3 » Sun Aug 25, 2013 9:15 am

I'd agree with msnow, besides I can't understand how you can eyeball a bent shaft. You need a dial indicator.

Before you spend any money take a look at this short clip I found for you.......

http://www.youtube.com/watch?v=7vNuCMyC8Gg

I can't speak to the 0.002 spec that they reference in the clip. You'd need to check a service manual for that.

Good Luck,

T3
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Re: Prop shaft

Postby bwgoodwin » Tue Aug 27, 2013 10:31 am

taffy3 wrote:I'd agree with msnow, besides I can't understand how you can eyeball a bent shaft. You need a dial indicator.

Before you spend any money take a look at this short clip I found for you.......

http://www.youtube.com/watch?v=7vNuCMyC8Gg

I can't speak to the 0.002 spec that they reference in the clip. You'd need to check a service manual for that.

Good Luck,

T3



when i spin it by hand i can see that the end of shaft is not staying in the same plane. so if it is off that much, im hosed. there is a couple chips in the skeg as well, so it is not that suprising

i think my buddy has a dial indicator, i will see if i can get my hands on it and do the test in the video line
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