Go Back   TeamTalk > Maintenance Tips, How-tos and Refurbishing Topics > Engine / Drive Train

Reply
 
Thread Tools Display Modes
  #1  
Old 04-17-2014, 08:57 PM
funonthewater funonthewater is offline
TT Newbie
 
Join Date: Mar 2014
Boat: 1989 Prostar 190 351
Location: Midwest
Posts: 17
Couplers do not line up between transmission and drive shaft

I recently placed a used '85 PCM motor and placed my standard 1:1 transmission from the original 1989 Indmar into my 1989 Prostar 190. The motor mounts from the '89 Indmar were pretty crusty and one was bad, so I used the motor and tranny mounts from the PCM. Everything seemed to be going well, including the adjustments to line up the coupler on the drive shaft, then I ran out of adjustment on the starboard motor mount. I'm still not aligned to spec for the couplers mating together and it appears I may need to modify the mount to get everything aligned properly. Is there any adjustment in the drive shaft at all that could help me get things lined up or do I need to look at cutting away at some of the motor mount area that looks the end of a bone. This may get me the additional adjustment that I need. I can move the drive shaft back and forth a bit, which appears to give me the adjustment that I need, however I'm not sure if I'm creating an issue that will result in a vibration. Can I move the shaft to line up the couplers or should I modify the mount.

Thanks in advance for any help that you can provide.
Reply With Quote
  #2  
Old 04-17-2014, 09:42 PM
mikeg205's Avatar
mikeg205 mikeg205 is online now
Moderator
 
Join Date: Aug 2011
Boat: 1995 Pro Star 205 5.7 Liter
Location: Plainfield - Joliet, IL
Posts: 11,725
Send a message via Skype™ to mikeg205
Bouyhead here made a modified mount.. but the strut and shaft log govern the drive line.

Pictures would be helpful.
__________________
...A bad day water skiing still beats a good day at work...1995 Pro Star 205....
Reply With Quote
  #3  
Old 04-17-2014, 10:47 PM
milehigh970's Avatar
milehigh970 milehigh970 is offline
TT Enthusiast
 
Join Date: May 2010
Boat: 1986 skier w/ a fresh 351 and 2008 x2 w/ MCX
Location: colorado
Posts: 277
Did you check to make sure your driveline comes through you shaft log straight? Do your strut bushings look like they are wearing uneven?
Reply With Quote
  #4  
Old 04-17-2014, 11:35 PM
FrankSchwab FrankSchwab is offline
MC Devotee
 
Join Date: Aug 2004
Boat: 1998 Maristar 200VRS
Location: Phoenix, AZ
Posts: 1,562
Is it possible that the port/starboard engine mounts are slightly different lengths, and if you swap them you'll be in good shape?
__________________
1998 Maristar 200VRS
Reply With Quote
  #5  
Old 04-18-2014, 10:45 AM
TRBenj TRBenj is offline
MC Devotee
 
Join Date: Dec 2005
Boat: 1990 Ski Nautique
Location: NWCT
Posts: 1,149
How/where are you supporting the driveshaft during all of this? Is it being held in place where it is aligned in the strut (where it spins freely)? Or are you letting it sag under its own weight? If the latter, you need to start over.

No, you cannot really change how/where the strut and log are installed in the boat without starting a major project (and that would be back asswards). Alignment starts from the strut forward, meaning the shaft is aligned to the log first (this should already be the case unless the strut is tweaked or it was previously screwed up by a previous owner or the factory). Where the motor installs is a result of where the shaft is, not the other way around.

Which way did you run out of adjustment? Left/right, or up/down? Moving the engine forwards or backwards a little can help with the up/down problem. So can placing additional blocks (aluminum, etc) under the mounts if it needs to go up.
Reply With Quote
  #6  
Old 04-18-2014, 03:01 PM
funonthewater funonthewater is offline
TT Newbie
 
Join Date: Mar 2014
Boat: 1989 Prostar 190 351
Location: Midwest
Posts: 17
The shaft log, rubber coupling and shaft running to the transmission are not supported. Also, I am out of adjustment from left to right, up and down I am fine at this point. I can take some pictures next week when I have access to the boat again.
Reply With Quote
  #7  
Old 04-18-2014, 05:54 PM
mikeg205's Avatar
mikeg205 mikeg205 is online now
Moderator
 
Join Date: Aug 2011
Boat: 1995 Pro Star 205 5.7 Liter
Location: Plainfield - Joliet, IL
Posts: 11,725
Send a message via Skype™ to mikeg205
You should be able to shift motor/trans left right . Adjustment must be more than .003 top to bottom left right and stay parallel when turning. Shaft should turn easily by hand.


Sent from my iPhone using Tapatalk
__________________
...A bad day water skiing still beats a good day at work...1995 Pro Star 205....
Reply With Quote
  #8  
Old 04-21-2014, 07:25 PM
TRBenj TRBenj is offline
MC Devotee
 
Join Date: Dec 2005
Boat: 1990 Ski Nautique
Location: NWCT
Posts: 1,149
A left/right alignment issue may indicate a bent strut. Better pop under the boat and take a close look. A small framing square and a tape measure may help you spot a bend that can be difficult to see with the naked eye.
Reply With Quote
  #9  
Old 05-02-2014, 10:47 AM
funonthewater funonthewater is offline
TT Newbie
 
Join Date: Mar 2014
Boat: 1989 Prostar 190 351
Location: Midwest
Posts: 17
Below are some pictures of what I am looking at. The engine is out of adjustment without modifying the mounts.


Name:  boat pic 1.JPG
Views: 164
Size:  92.9 KB

Name:  boat pic 2.JPG
Views: 162
Size:  140.2 KB

Name:  boat pic 3.jpg
Views: 161
Size:  51.1 KB
Reply With Quote
  #10  
Old 05-02-2014, 11:56 AM
TRBenj TRBenj is offline
MC Devotee
 
Join Date: Dec 2005
Boat: 1990 Ski Nautique
Location: NWCT
Posts: 1,149
I assume the point you are comparing to is where the shaft spins freely in the strut?

If so, then I still suggest:
Quote:
Originally Posted by TRBenj View Post
A left/right alignment issue may indicate a bent strut. Better pop under the boat and take a close look. A small framing square and a tape measure may help you spot a bend that can be difficult to see with the naked eye.
Reply With Quote
Reply

Thread Tools
Display Modes

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


All times are GMT -4. The time now is 08:33 PM.