Return to the home page...

Go Back   Moyer Marine Atomic 4 Community - Home of the Afourians > Discussion Topics > Reversing Gear

Reply
 
Thread Tools Display Modes
  #1   IP: 24.53.89.131
Old 06-02-2018, 06:12 AM
Peter's Avatar
Peter Peter is offline
Senior Member
 
Join Date: Jul 2016
Location: Nova Scotia, Canada
Posts: 137
Thanks: 35
Thanked 59 Times in 43 Posts
tail shaft - how much wiggle?

Hello all,

I had a leak at the rear of my reversing gear and am tackling the repair this year. So far I have lifted my engine forward into the "salon" and removed the output coupling and thrust bearing.

The spring was broken in the oil seal so I am hoping that was the root of the problem.

while i am in there i decided to replace the thrust bearing as well.

My questions.

1) Should there be any side-to-side play in the tail shaft with the output coupling removed? Mine has a fair bit of wiggle - maybe 1/4" or 3/8"?

2) Would this suggest a bum pilot bearing?

3) If so, can i remove the reversing gear with the thrust bearing plate removed?

4) Is this all covered in the reversing gear video?

Looking forward to your wise council.

Best,

Peter
Reply With Quote
  #2   IP: 32.211.28.40
Old 06-02-2018, 09:02 PM
Al Schober's Avatar
Al Schober Al Schober is offline
Afourian MVP
 
Join Date: Jul 2009
Location: Uncasville, CT
Posts: 1,334
Thanks: 4
Thanked 146 Times in 128 Posts
The output coupling rides inside the rear bearing. With the coupling removed, the tailshaft will have some motion - can't really say whether 1/4" is too much. Check again with the coupling in place - should be fine.
Replacing the seal should stop the leak. First overhaul I did consisted of new rings and a new output seal. Engine is still in the boat to this day, and just completed a run from CT to Rockland, ME - including about 30 hr of continuous running (at reduced throttle, burning 10 gal of fuel). Only issue was an exhaust system failure, repaired class A in 9 hours at Burr Bros in Marion, MA.(yes, this is a plug - they're good and fast).
Reply With Quote
The Following 2 Users Say Thank You to Al Schober For This Useful Post:
Administrator (06-02-2018), Peter (06-02-2018)
  #3   IP: 24.53.89.131
Old 06-07-2018, 07:09 AM
Peter's Avatar
Peter Peter is offline
Senior Member
 
Join Date: Jul 2016
Location: Nova Scotia, Canada
Posts: 137
Thanks: 35
Thanked 59 Times in 43 Posts
To close the loop on this, I examined the tail shaft on a blown engine I have kept for miscellaneous parts and trying out repair procedures on.

The tail shaft on that engine wiggled about the same as the one in the boat.

I concluded that is the normal amount of wiggle. I suppose they both could be bad too...

I finished the repair and cannot recommend the MMI Tech Video on rear seal replacement highly enough.

Transmission seems to work fine now - no leaks and much quieter with the new thrust bearing.

Regards,

Peter
Reply With Quote
The Following User Says Thank You to Peter For This Useful Post:
Administrator (06-07-2018)
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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Tail Shaft Compatibility between Old/New Model A4s Glennjamin19 Drive Train / Propellers 2 07-04-2016 11:39 AM
Shaft back in, how worried should I be about alignment JimF Drive Train / Propellers 9 06-23-2016 09:24 PM
Prop Shaft - where to start and end.... bradh Drive Train / Propellers 26 03-27-2016 10:42 PM
Shaft removal, cutless, stern tube replacement CalebD Drive Train / Propellers 93 02-07-2014 06:30 PM
Tail shaft for V-drive unit Pace Reversing Gear 3 05-05-2009 06:20 PM


All times are GMT -4. The time now is 02:56 AM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2018, vBulletin Solutions, Inc.


Universal® is a registered trademark of Westerbeke Corporation

Copyright © 2004-2018 Moyer Marine Inc.

All Rights Reserved