iboats - The #1 Store For Everything Boating
 
  #1  
Old October 2nd, 2009, 09:26 PM
irongenny140 irongenny140 is offline
Cadet
 
Join Date: Oct 2009
Location: Westlake Ohio
Posts: 4
Default 1972 Mercury 140 lower gear case

I just bought this about a month ago. It is on a 1972 16 foot checkmate. We lost reverse and I then noticed a lower gear oil leak coming from a big pin hole on the front of the bullet. Did we shoot reverse through the case? Fixable??? I am thinking I am now looking for a lower gear unit. It has a bad skeg and another chunk missing as well. Perhaps there is a dead one out the with a good gearcase? We also have a broken motor mount thanks to my son's WOT turns in rough water. Thoughts?
Reply With Quote
  #2  
Old October 3rd, 2009, 08:05 PM
daveswaves's Avatar
daveswaves daveswaves is offline
Chief Petty Officer
 
Join Date: Mar 2002
Location: Long Point Ontario
Posts: 553
Default Re: 1972 Mercury 140 lower gear case

Quote:
Originally Posted by irongenny140 View Post
I just bought this about a month ago. It is on a 1972 16 foot checkmate. We lost reverse and I then noticed a lower gear oil leak coming from a big pin hole on the front of the bullet. Did we shoot reverse through the case? Fixable??? I am thinking I am now looking for a lower gear unit. It has a bad skeg and another chunk missing as well. Perhaps there is a dead one out the with a good gearcase? We also have a broken motor mount thanks to my son's WOT turns in rough water. Thoughts?
Likely the shift dog is rusted due to water intrusion through the pin hole. The actual gears may or may not be OK, depends on how long they sat corroding in water. As for the broken motor mount it should have been able to stand up to turns at any speed. Likely it was cracked or damaged previoulsly. It just happened to break when stressed. Sounds like you are looking at a replacement gear case. They do come available on ebay. Check the gear ratio of your 140 before getting a replacement. Most used gear cases are 2:1 ratio, yours may or may not be, it may have been replaced . If you can post a picture of the broken mount it will be easier to help you with that problem.
__________________
Mercury inlines....nothing else stacks up
The answer to "do i need to change my water pump impeller" is YES
Reply With Quote
  #3  
Old October 13th, 2009, 08:08 PM
irongenny140 irongenny140 is offline
Cadet
 
Join Date: Oct 2009
Location: Westlake Ohio
Posts: 4
Default Re: 1972 Mercury 140 lower gear case

Thanks.

The motor mount was previously welded. I think it would be better to replace than to try to repair. I will be watching ebay for another 140HP. Either the parts or a whole motor with a bad powerhead.
__________________
Brian McNeill
Westlake Ohio

1989 Slickcraft/Tiara SC 310
1972 Restored D & M Thistle 3147
1972 Checkmate 140 Merc
A couple of dinghys, kids, dog and a wife.
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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

vB 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
lower gear case oil ifixf18s Mercury & Mariner Outboards 2 April 9th, 2009 09:08 PM
lower gear case oil/ok for mercury high perf fishinthesierras Yamaha & Suzuki Outboards 1 February 9th, 2009 07:03 PM
Lower Gear Case... usamarshal Johnson & Evinrude Outboards 6 December 4th, 2006 04:07 PM
can't seem to get gear case off of lower end shindig888 Force & Chrysler Outboards 5 June 14th, 2006 10:30 PM
1972 Merc 250/165 lower gear case anthonypgaytan Mercury & Mariner Outboards 0 September 1st, 2004 08:50 PM

iboats Forum Directory
Over 100,000 forum posts organized by topic
Outboard Motor Topics
Mercury Outboards
Johnson Outboards
Evinrude Outboards
Force Outboards
Yamaha Outboards
Mariner Outboards
Suzuki Outboards
Honda Outboards
Chrysler Outboards
Tohatsu Outboards
Nissan Outboards
Outboard Motors: non-repair
Vintage Outboards

I/O and Inboard Topics
MerCruiser
OMC I/O, Inboard
Volvo Penta

Propeller Help
Boat Propellers

Boat Repair and Products
Boat Building and Repair
Fiberglass Boat Repair
Marine Electronics
Boat Trailers and Towing
Boat Names
Boat Covers
Boat Parts

Boating Activities Talk
Boating Topics and Questions
Boating Activities and Destinations
Boating Blunders
Boat Shows
Wakeboarding
Water Skiing

Fishing Discussions
Freshwater Fishing
Saltwater Fishing

Boat Type Topics
Aluminum Boats
Bass Boats
Bowrider Boats
Center Console Boats
Cruiser Boats
Cuddy Cabin Boats
Deckboats
Fishing Boats
Fish and Ski Boats
Houseboats
Jet Boats
Jon Boats
Pontoon Boats
Powerboats
PWC Forum
Ski Boats
New Boats
Used Boats

Boat Manufacturers
Boats 250+ Manufacturers
Bayliner Boats
Sea Ray Boats
Zodiac Boats



Outboards

Power Heads

Lower Units

Propellers

Inflatable Boats

Boat Manuals

Engine Parts

All times are GMT -4. The time now is 10:49 PM.