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When I shift into forward, 3/4 of the time the engine will vibrate so badly it sounds like it will tear itself off its mounts. I then back off and try again, sometimes it takes 3 or more times before it will catch smoothly.I've recently tried expermenting by throwing it in reverse first then forward, this works about every time.
I have a Martek folding prop on the boat. Could the problem be that the prop isn't opening all the way or 1 blade not opening thus causing the shaft to be unbalanced?
If that is the problem what can this prop be fixed or should I just get a new one?
Thanks John
Molly J #431
My boat does the same although not as often(perhaps 1 in 5). I am sure it is my folding prop (make unknown).I have thought it normal ,and have learned to live with it.Once deployed it works normally F to R when docking. The prop shows no signs of unusual wear. Anybody else have any insight?
Yep... I have a martec prop that does the same thing...first..... when you hual the boat out in the fall... clean the prop... take the blades off and clean everything as best you can.... a little emery cloth goes a long way... then, using a good grade of silicon grease coat the entire bearing area and re-assemble the blades into the hub..... you might as well coat the entire prop, it does not hurt them at all.
Until you can get to that chore... ease in the forward and both blades should open okay... what happens is that one sticks and stays in the closed postion and the other blade is out, I think you figured that out....
'IRIS'
1975 C&C 27 MKlll
Hull # 453
Kittery Point, Maine
Occasionally, my Martec prop does the same thing. Based on advice which I found elsewhere on the net (possibly Moyer Marine), I have developed a technique of throwing the prop into reverse for a second or two. This causes the prop to open fully. If you then shift right away into forward, you no longer have a vibration problem.
Marcus,
Carriden, Hull #847
Iris offers good advice on maintenance for your prop, but bear in mind that folding props do wear with use; the holes in the blades expand and the pivots wear down. This makes the blades more prone to the type of binding and failure to open that you describe. Ultimately the prop will need rebuilding – this includes inserts to return the blade holes to their original size and new pivot shafts. Martec and Michigan will rebuild their props and you can often find local prop shops that will do the work.
If the blades of your prop seem significantly more sloppy than other boats', or they don't respond to Iris' suggested maintenance, consider a rebuild (or a replacement if you want the comparative luxury of a geared prop).
David Weatherston
Towser, Toronto
C&C 27 Mk IV
David Weatherston
Towser, Toronto
C&C 27 Mk IV
Offline
I have been experiencing the same problem with my Martec folding prop and was planning on removing it after haul out in the fall and sending it out for a rebuild. I can send it to Martec in California but would prefer to send it somewhere in Canada for the work. Has anyone used a good shop for this purpose?
ThanksThe Marshall's
Hotel California
1979 Mk III
Dryden, Ontario
The Marshall's
Hotel California
1979 Mk III
Dryden, ; Ontario
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One additional thought when it comes to the vibration.... check your cutless bearing to see if it is worn... if it is, the extra gap allow the propshaft to really set up virbrations...
"IRIS"
1975 C&C 27 MKlll
Hull #453
kittery Point, Maine
Following the query about Canadian rebuilders, I spoke to RCYC Marine Services and was told that while there are lots of options for solid-prop repair, they now much prefer to return folding props to the manufacturer for rebuilding.
David Weatherston
Towser, Toronto
C&C 27 Mk IV
David Weatherston
Towser, Toronto
C&C 27 Mk IV
Offline
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