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Old 07-01-2012, 22:16   #1
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Paragon Gear Box P33l

hey guys maybe someone could shed some light on me gear shifting problem.i have forward but no reverse.when i shift to reverse the shaft spins but as i increase engine revs she does not respond.real bad slippage aye.our vessel is a yacht ,the motor is a ford series E2400 4 cyclinder diesel.i checked the dip stick,its about 3mm 1/8 maybe low on the mark.thanks for any input
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Old 08-01-2012, 10:36   #2
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Re: paragon gear box p33l

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when i shift to reverse the shaft spins but as i increase engine revs she does not
Are you saying the prop shaft spins? If thats the case and you have forward but little reverse, the only thing I can think of is your bottom and prop is so packed with growth, it will not be able to produce thrust.
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Old 08-01-2012, 12:09   #3
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Re: paragon gear box p33l

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Originally Posted by kiwi rob View Post
hey guys maybe someone could shed some light on me gear shifting problem.i have forward but no reverse.when i shift to reverse the shaft spins but as i increase engine revs she does not respond.real bad slippage aye.our vessel is a yacht ,the motor is a ford series E2400 4 cyclinder diesel.i checked the dip stick,its about 3mm 1/8 maybe low on the mark.thanks for any input
Your transmission most likely has a brake band for reverse. It is a simple matter to adjust it. There should be a screw under an acorn nut somewhere on the side of the box. Remove the cover nut to expose the screw and its' lock nut. With the transmission in neutral turn the screw in til the transmission rolls over then back off 1/2 turn and you are done.

The manual for your transmission should be available on line.
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Old 08-01-2012, 17:04   #4
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Re: paragon gear box p33l

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Originally Posted by perchance View Post
Your transmission most likely has a brake band for reverse. It is a simple matter to adjust it. There should be a screw under an acorn nut somewhere on the side of the box. Remove the cover nut to expose the screw and its' lock nut. With the transmission in neutral turn the screw in til the transmission rolls over then back off 1/2 turn and you are done.

The manual for your transmission should be available on line.

Ya but, this is what I don't get...he said that the shaft was spinning!
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Old 08-01-2012, 19:43   #5
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Re: paragon gear box p33l

Thanks Perchance-you've given me something to go on.

Celestial Sailor-nah mate I've got a clean prop. When I shift from neutral to reverse the shaft slowly spins in reverse but does not increase in revs regardless of how much engine acceleration I give it.
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Old 08-01-2012, 20:40   #6
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Ahoy,
I had the Paragon P45'S bolted up behind Ford 427's and my starboard engine would have the same problem from time to time. There is a brake band around the planetary drum that engages reverse and causes that aweful whining sound when the gears inside start rotating against the drum housing to produce reverse rotation.

The brake band is engaged by a plunger in the control housing. This plunger has a rubber O-Ring on it that likes to pop off if you power hard in reverse. It is easy to replace by removing the control assembly cover. If I remember correctly, there are 6 or 8 screws holding the cover on.

I kept spare O-Rings onboard but switched to diesel with velvet drives a few years back. In the US,Transmissions Marine Inc can get you just about any part for the P series Paragon transmissions. I rebuilt one myself about 8 years back and they are pretty simple to work on. Ran that tranny for years without problems.

Later,
NJ
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Old 08-01-2012, 21:06   #7
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Re: paragon gear box p33l

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Originally Posted by kiwi rob View Post
Thanks Perchance-you've given me something to go on.

Celestial Sailor-nah mate I've got a clean prop. When I shift from neutral to reverse the shaft slowly spins in reverse but does not increase in revs regardless of how much engine acceleration I give it.
Thank you for the clarification. Yes...if the shaft ONLY spins slow with any range of RPM, then it is probably internal as Neptune has described.
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