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halseyf
#1 Posted : Sunday, April 27, 2008 12:44:35 AM(UTC)
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Hi All!
I am getting ready to drop my 32 FB in the water and noticed that the props are pitted pretty badly. I had them repaired about 3 years ago but the repair only held until now. I am going to Call John for a couple of new ones. What is the best way to determine if I have a 1:1 drive or a 1.52:1 drive? Thanks for the input

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dougrose
#2 Posted : Sunday, April 27, 2008 10:32:36 AM(UTC)
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It is my belief that all the 1:1 trannys drove 14" props, and all the 1.52:1 trannys drove 16" props. So the prop size should tell you.

John has a list of the factory prop sizes for each engine at http://www.marinette.com/propsize.htm

The tranny also has a data plate that should give ratio and rotation. At least mine do.

The only direct way I know is to put a piece of bright tape on the damper, front of the engine, and another piece on the transmission output. While in gear, jump the starter directly so the ignition and neutral lockout are defeated, and see if the taped spots are going around together.


1975 32' Flybridge Sedan, twin Perkins 6-354 diesels, 1:1.53 velvetdrives, 16 X 19 props. Merritt Island, Florida
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SORRYDOG2
#3 Posted : Sunday, April 27, 2008 2:48:49 PM(UTC)
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pitted props are not good!! There is a reason for this, are the edges discolored?? If so could be electrical problem, need check. Just a word of caution, good luck. Sorrydog
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fastjeff
#4 Posted : Sunday, April 27, 2008 11:06:44 PM(UTC)
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Listen to the "Dog". There's a reason that is happening, and you need to correct it. I would first check the prop shaft to tranny for electrical continuity with a meter--there should be none! If there is any continuity, an isolating washer or "tube" (around the bolts) is missing or allowing metal to touch.

A good prop shop can "tune up" your props for far less than new ones. That includes removal of pits. Something to look into.

Jeff
"...reality is not nearly as lovely as the world of Liberal Land. No wonder so many people want to go there." - Tom Sowell
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jralbert
#5 Posted : Wednesday, April 30, 2008 4:03:06 AM(UTC)
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This is an excellent discussion. But it's in the wrong place. This part of the forum was set up for administration of the forum itself. Threads like this go into a maintenance area. Just grousing cause it's time to cut the grass.
Joel Albert, Potomac MD
"Charlie B" - 1988 32' FBS
Twin 318's/FWC/16x15 nibral props
docked Deale, MD
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fastjeff
#6 Posted : Wednesday, April 30, 2008 4:18:51 AM(UTC)
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The General is correct! Don't cut any toes off now.

JEff
"...reality is not nearly as lovely as the world of Liberal Land. No wonder so many people want to go there." - Tom Sowell
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