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-   General Q & A (https://www.offshoreonly.com/forums/general-q-20/)
-   -   Broken output shaft & coupler (https://www.offshoreonly.com/forums/general-q/331035-broken-output-shaft-coupler.html)

No Coast 09-26-2015 05:06 PM
I have a heavy duty PTO adapter for big block Chevy that bolts to the crankshaft using crank bolts and provides a 4 bolt pattern for u-joint flange. We use them in jet drive applications. I'd ship it to you for $75 bux, it is new, un-used. Give me an email and I'll send you pictures.

mrv8outboard 09-26-2015 05:51 PM
Well that explains a plausible cause. It is able to flex and move around with out the pilot bushing to keep it aligned from the bearing through the coupler to the crank.

jdflchr 09-26-2015 06:50 PM
Originally Posted by No Coast (Post 4359067)
I have a heavy duty PTO adapter for big block Chevy that bolts to the crankshaft using crank bolts and provides a 4 bolt pattern for u-joint flange. We use them in jet drive applications. I'd ship it to you for $75 bux, it is new, un-used. Give me an email and I'll send you pictures.
I would like to see it. I'm not sure it's going to work for me. I would have to take out the coupler and make a longer drive shaft. All stuff I can do but not sure how I feel about running the boat without a coupler. Email is [email protected] I'll take a look and see of it will work.
Thanks

jdflchr 09-26-2015 06:55 PM
Originally Posted by mrv8outboard (Post 4359076)
Well that explains a plausible cause. It is able to flex and move around with out the pilot bushing to keep it aligned from the bearing through the coupler to the crank.
I'm not convinced that's the whole problem but I'm sure it didn't help. I ordered a bushing today so it will be one in when it goes back together. I have a few leads on a custom built shaft that will be stronger so between those two things I hope I will not have this problem anymore. Next problem will be blowing out couplers all the time. Thanks for your help!

Griff 09-27-2015 12:55 PM
Originally Posted by jdflchr (Post 4359097)
I would like to see it. I'm not sure it's going to work for me. I would have to take out the coupler and make a longer drive shaft. All stuff I can do but not sure how I feel about running the boat without a coupler. Email is [email protected] I'll take a look and see of it will work.
Thanks
Running without a coupler shouldn't be a problem. That is the standard way with Stelling ext boxes.
I have Stelling boxes and my engines are also moved forward about 16" and I run drive shafts.
I don't have nearly your HP though, but the boat originally had 750's with this set up.

cheech 09-27-2015 10:47 PM
Check with Bam also. I know they make Flanges for the trannies. So he might have some leads or suggestions. He's on the board here also.

jdflchr 09-28-2015 08:56 AM
Originally Posted by cheech (Post 4359434)
Check with Bam also. I know they make Flanges for the trannies. So he might have some leads or suggestions. He's on the board here also.
I called Bam when I broke the first one. They didn't have anything at that time. Maybe I'll check with them again. Thanks

Got Freedom? 09-29-2015 10:09 PM
DriveGuardian would definitely eliminate your coupler issues and can easily handle your HP levels. MDC can also build a custom input shaft for you that can handle 1,000+HP without breaking.

GF?




Originally Posted by jdflchr (Post 4358531)
I didn't even know what a Drive Guardian was, I had to look it up. That's a great idea. I just bought a new coupler and bearing today if I can't find a better shaft soon I'll get one more stock one just because I'm going to Key West poker run with this boat and I'm running out of time. I'll be looking into a drive guardian for next years boating season. Thanks for the idea.

Baja Rooster 09-30-2015 11:05 AM
Maybe this would help? Drive plate damper.

http://www.***************.com/hardi...rough-1800-hp/

jdflchr 10-03-2015 06:38 AM
Originally Posted by Got Freedom? (Post 4360510)
DriveGuardian would definitely eliminate your coupler issues and can easily handle your HP levels. MDC can also build a custom input shaft for you that can handle 1,000+HP without breaking.

GF?
Who is MDC? It's not my drive input shaft that I'm breaking but if they make custom shafts I would like to talk to them.
Thanks

Griff 10-03-2015 12:32 PM
Originally Posted by jdflchr (Post 4361793)
Who is MDC? It's not my drive input shaft that I'm breaking but if they make custom shafts I would like to talk to them.
Thanks
http://www.marinedesigncorp.com/2014.html

Got Freedom? 03-01-2016 01:15 PM
Originally Posted by jdflchr (Post 4361793)
Who is MDC? It's not my drive input shaft that I'm breaking but if they make custom shafts I would like to talk to them.
Thanks
Marine Design Corporation builds DriveGuardian and other custom components. They are currently fabricating a batch of the Bravo output shafts (the ones with the 1350 flange that slides into the coupler for a driveline setup) that are designed to handle more than 1,000HP. They are made in the USA and very high quality. Let me know if you are interested.

GF?


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