Like Tree18Likes

The curse continues... Brand new coupler slipping?

Reply
Old 09-25-2016, 11:56 AM
  #11
Registered
 
Join Date: Oct 2013
Location: rock Island wa
My Boats: 1995 fountain 24cs 1988 glasstroncarlson 16
Posts: 1,962
Default

Are you sure its actually slipping ? Don't see why it would hold getting on plane but slip when decelerating. It may be a cable adjustment issue.
buck35 is offline  
Reply With Quote
Old 09-25-2016, 12:12 PM
  #12
Registered
Trade Score: (3)
 
Join Date: Apr 2006
Location: Toledo Oh
My Boats: 22 Avanti, 25 Nova, 2 turtle doves and a partridge in a pear tree,SBYC
Posts: 8,651
Default

Hows your prop???
phragle is offline  
Reply With Quote
Old 09-25-2016, 12:31 PM
  #13
Registered
 
Join Date: May 2012
My Boats: '86 Formula 206, '89 Formula 272 (Sold), '87 Formula 311
Posts: 1,421
Default

Mark the coupler and shaft with a white paint stick then run and see if it's moved, do same with prop and hub. If neither have moved it's your drive/cone clutch.

Is there anything in front of the prop that may be causing cavitatiin?
Mr Maine is offline  
Reply With Quote
Old 09-25-2016, 01:27 PM
  #14
Platinum Member
Platinum Member
Thread Starter
 
TomZ's Avatar
 
Join Date: Feb 2001
Location: Virginia Beach, VA
My Boats: '88 Formula 311 SR1 "Beach Party"
Posts: 1,500
Default

Coupler is trashed. It seems like the rubber tried to twist out of the housing.
TomZ is offline  
Reply With Quote
Old 09-25-2016, 01:50 PM
  #15
Platinum Member
Platinum Member
Thread Starter
 
TomZ's Avatar
 
Join Date: Feb 2001
Location: Virginia Beach, VA
My Boats: '88 Formula 311 SR1 "Beach Party"
Posts: 1,500
Default

[ATTACH=CONFIG]559724[/ATTACH]
Attached Thumbnails
The curse continues... Brand new coupler slipping?-img_3460.jpg  
TomZ is offline  
Reply With Quote
Old 09-25-2016, 01:51 PM
  #16
Platinum Member
Platinum Member
Thread Starter
 
TomZ's Avatar
 
Join Date: Feb 2001
Location: Virginia Beach, VA
My Boats: '88 Formula 311 SR1 "Beach Party"
Posts: 1,500
Default

Sorry the pic is upside down. I'm doing this from my iPhone.

Last edited by TomZ; 09-25-2016 at 02:58 PM.
TomZ is offline  
Reply With Quote
Old 09-25-2016, 03:38 PM
  #17
Platinum Member
Platinum Member
Thread Starter
 
TomZ's Avatar
 
Join Date: Feb 2001
Location: Virginia Beach, VA
My Boats: '88 Formula 311 SR1 "Beach Party"
Posts: 1,500
Default

Here's my thinking on this:

I went with an aftermarket coupler (Sierra 18-2412). It was close in price to the OEM HD coupler offered by CP Performance, and was listed as a replacement part for an HP 500 (saw some guys here on OSO using this coupler with high HP and no issues). I would have gone with the OEM but CP wanted a lot of money to ship, and I got free shipping through Amazon. I didn't want to use the coupler with the grease shaft because I didn't have the room to get it installed. Anyway, potential lesson learned. I don't think the coupler was up to the task or it was defective.

The engine was aligned properly. The reason the last coupler failed was my fault. I was really sick putting the engine back in the boat after I had flywheel issues., and one of the spiral washers fell out when we were setting her back down. I didn't check alignment because it was good before. I was so sick during the whole install, and it was 98 degrees at 11 am... I just sssumed it was okay. Anyway, it stripped the splines out of the coupler. It was worn out anyway, and I put the last nail in its coffin. But I know for sure the alignment this time was spot on. And the transom, stringers, etc, are and were all perfect. And, I had ten hours on it with no issues until a backfire took out the starter/flywheel.

I'll order a new coupler and go through the whole process once again.

Any one seen a coupler with the rubber twisted like that? Is 650 lbs ft of torque enough to do that?
TomZ is offline  
Reply With Quote
Old 09-25-2016, 03:39 PM
  #18
Registered
Trade Score: (2)
 
Join Date: Aug 2011
Location: bel air, md
My Boats: 1997 Donzi 27 zx & Almost 35' Fountain
Posts: 2,735
Default

Quote:
Originally Posted by TomZ View Post
[ATTACH=CONFIG]559724[/ATTACH]
There's your problem bushings are shot or moved in the belhousing.
Black Baja is offline  
Reply With Quote
Old 09-25-2016, 04:06 PM
  #19
BUP
Registered
Trade Score: (6)
 
Join Date: Jul 2011
Location: Ft. Worth TX
My Boats: 2017 - 29 Laveycraft Custom Build & SHE's Going to be a Bad Boy. www.laveycraft.com
Posts: 6,761
Default

About half the time, it is best to buy the OEM parts because buying cheaper parts never works out being cheaper for the end results. CHINA crap. Also there is no quality checks on a lot of aftermarket parts. NONE especially for the marine side of things. Not trashing Sierra because some of there stuff is good and some of there is complete junk.

The number 1 problem with trashing a coupler in very short order when everything else is in 100 percent order - read the SB completely to make sure you are correct with the set you have. Also we have seen some Sierra couplers not holding up.

read this to a Tee. And even applies if your engine alignment is dead on -

http://www.marinemechanic.com/merc/d...her-design.pdf

Also make sure the person installing the coupler did not warp it. More common than you think. Also Merc has a SB that helps installing the coupler properly and this also helps with alignment. Highly recommend a OEM service manual that is specific to all your boat / engine / drive applications. This will give you proper procedures and correct torque specs along with correct part installs.

Last edited by BUP; 09-26-2016 at 01:22 AM.
BUP is offline  
Reply With Quote
Old 09-25-2016, 04:42 PM
  #20
Platinum Member
Platinum Member
Thread Starter
 
TomZ's Avatar
 
Join Date: Feb 2001
Location: Virginia Beach, VA
My Boats: '88 Formula 311 SR1 "Beach Party"
Posts: 1,500
Default

Quote:
Originally Posted by Black Baja View Post
There's your problem bushings are shot or moved in the belhousing.
Can you elaborate? This thing was just apart, and everything looked fine.
TomZ is offline  
Reply With Quote
Reply



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 03:47 AM.


Copyright 2011 OffShoreOnly. All rights reserved.