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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Gas > Atomic 4 > atomic 4 shifting in forward-- heavy vibes
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Thread: atomic 4 shifting in forward-- heavy vibes Reply to Thread
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Topic Review (Newest First)
04-20-2009 09:28 PM
Faster
Quote:
Originally Posted by lasallehome View Post
yes I do have a folding 2 blade prop
Sorry Lasalle, missed that the first time.... SD was yelling at me!

I'm pretty sure your problem is indeed the prop. Try spinning it in reverse just before you go ahead, that usually deals with the problem. If the prop is badly worn (or the cheeks splayed) this makes things worse.
04-20-2009 05:41 PM
lasallehome yes it is a bronze 2 blade folding prop
04-20-2009 05:41 PM
lasallehome yes I do have a folding 2 blade prop
04-20-2009 05:26 PM
sailingdog
Quote:
Originally Posted by Faster View Post
SD - in our experience with our ungeared martec, it always opened equally in reverse, but occasionally failed to do so in forward. We took to spinning the prop briefly in reverse and shifting to forward and rarely had that problem again.
Oh..

Quote:
Lasalle: do you or do you not have a folding prop on this boat???
Yes, see post 7... but it is probably a bronze folding prop.
04-20-2009 05:19 PM
RanAweigh
Quote:
Originally Posted by sailingdog View Post
My reason for thinking transmission and not prop is that he doesn't have any issues in reverse. A faulty prop would probably give problems in forward and reverse, would it not???
In most cases this would be a correct assumption. However, if the axle pin holes are worn a blade could "hang up" more in one direction of rotation than the other due to asymmetrical bias on the pin.
04-20-2009 04:54 PM
Faster
Quote:
Originally Posted by sailingdog View Post
My reason for thinking transmission and not prop is that he doesn't have any issues in reverse. A faulty prop would probably give problems in forward and reverse, would it not???
SD - in our experience with our ungeared martec, it always opened equally in reverse, but occasionally failed to do so in forward. We took to spinning the prop briefly in reverse and shifting to forward and rarely had that problem again.

Lasalle: do you or do you not have a folding prop on this boat???
04-20-2009 04:00 PM
lasallehome I did take her for a ride on saturday, when i started her at the dock and then put her into gear she vibrated heavily- then put into neutral and reverse and tried a few times more and then she was finally ok- I took her for a ride for about an hour and ran just fine.

Next day , same thing happened after she was warmed up at dock had to shift her back and forth few times before vibrations went away and fine for another ride. went sailing and same thing again- vibrated when started in forward again.

THANKS for all your help
04-20-2009 03:44 PM
sailingdog My reason for thinking transmission and not prop is that he doesn't have any issues in reverse. A faulty prop would probably give problems in forward and reverse, would it not???
04-20-2009 03:38 PM
lasallehome thanks -- all i know is that it is a 2 blade folding brass prop
04-20-2009 03:23 PM
Faster The fact that even the mast shakes violently, and the fact that the problem occasionally disappears really points to the prop not opening. But it would be nice to know what sort of prop it is before committing to that theory.
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