Go Back   The Ford Barn > General Discussion > Model A (1928-31)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 10-05-2018, 07:35 AM   #1
Frank Miller
Senior Member
 
Frank Miller's Avatar
 
Join Date: May 2010
Location: Auburn, MA
Posts: 1,539
Default Broken ring gear

A friend asked me to help him rebuild his rear end after he broke a tooth on the ring gear. I have not seen it yet but would like to know some things to look for to figure out what happened. I cannot see how these gears just break by themselves. Parts are not cheap and we only want to do this once. I usually only check in here in the morning so if you hear nothing right away that's why.
__________________
“The technique of infamy is to start two lies at once and get people arguing heatedly over which is true.” ~ Ezra Pound
Frank Miller is offline   Reply With Quote
Old 10-05-2018, 07:52 AM   #2
Keith True
Senior Member
 
Keith True's Avatar
 
Join Date: May 2010
Location: Epping N.H.
Posts: 2,244
Default Re: Broken ring gear

Spinning a tire on ice,then hitting solid pavement will break ring gears.It's probably not something he just did,but somebody cracked it 50-60 years ago and it finally gave way.I took one out of a truck that the owner had been driving for years with no problem.One day it just made a clunk,and lots of crashes after that.We took it apart and found one whole tooth broken off.After washing the parts we realized there was just a little section of fresh break,the rest of the break was aged with oil soaking.
Keith True is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 10-05-2018, 08:19 AM   #3
Keith
Member
 
Join Date: May 2010
Location: Rutland, MA
Posts: 37
Default Re: Broken ring gear

This one Frank is talking about above was a club member who broke it in the parking lot at the N.E. Meet in Lake George when we where leaving for home. The car was parked on a slight hill and when he went to go it went "BANG" locked the wheels and stalled the motor - every one stop and looked up when it happen. The rear end locked up but we were able to free it by backing in reverse. Loaded it on a club members trailer for the return trip home. I understand that it is now all apart waiting for parts. Keith
__________________
Keith
Keith is offline   Reply With Quote
Old 10-05-2018, 09:08 AM   #4
Al 29Tudor
Senior Member
 
Al 29Tudor's Avatar
 
Join Date: Jul 2012
Location: Venice, FL
Posts: 591
Default Re: Broken ring gear

Quote:
Originally Posted by Keith View Post
This one Frank is talking about above was a club member who broke it in the parking lot at the N.E. Meet in Lake George when we where leaving for home. The car was parked on a slight hill and when he went to go it went "BANG" locked the wheels and stalled the motor - every one stop and looked up when it happen. The rear end locked up but we were able to free it by backing in reverse. Loaded it on a club members trailer for the return trip home. I understand that it is now all apart waiting for parts. Keith

For great help putting it back together look up Tom Endy's 64 page instructions. Fantastic help.
Al
Al 29Tudor is offline   Reply With Quote
Old 10-05-2018, 09:14 AM   #5
Jacksonlll
Senior Member
 
Jacksonlll's Avatar
 
Join Date: Jul 2012
Location: Michigan-- Member of Oakleaf of MARC
Posts: 1,081
Send a message via ICQ to Jacksonlll
Default Re: Broken ring gear

Get and follow those instructions. It is far from simply changing parts. Those things that seal the banjo housing are not just gaskets, they are shims. Good luck.
Jacksonlll is offline   Reply With Quote
Old 10-05-2018, 09:39 AM   #6
Will N
Senior Member
 
Will N's Avatar
 
Join Date: Jul 2010
Location: New York
Posts: 656
Default Re: Broken ring gear

Perhaps some other piece broke loose (like a bit of safety wire?) and wedged itself in the ring gear, causing the tooth to break when the car was put in motion? My advice is to tear the whole thing completely apart and inspect everything. Replace the pinion gear along with the ring gear as a set. Check the spider gears and replace them if in question (though they tend not to have much wear as there is normally not that much relative motion between the spider and axle gears) Put in all new seals and bearings. It's a pretty big job so you'd want to do it right the first time.
Will N is offline   Reply With Quote
Old 10-05-2018, 09:58 AM   #7
SSsssteamer
Senior Member
 
SSsssteamer's Avatar
 
Join Date: Nov 2010
Location: Sedro-Woolley, WA
Posts: 889
Default Re: Broken ring gear

Having actively played with antique cars for about 60 years, I have seen ring gear teeth break off after many years of faithful use. Metal fatigue is usually the culprit. As mentioned above, there was an old oily shadow around where the tooth had been cracked before it finally let go. Metal fatigue results from many years of use where the piece is subjected to hard use. Metal fatigue is not limited to just the ring gear, but all of the stressed parts of the automobile.
SSsssteamer is offline   Reply With Quote
Old 10-05-2018, 01:04 PM   #8
Tom Endy
Senior Member
 
Tom Endy's Avatar
 
Join Date: May 2010
Location: Southern California
Posts: 2,360
Default Re: Broken ring gear

The transverse rear spring on a Model A Ford can easily bounce the rear wheels off the road when going over a speed bump, railroad tracks, or on a rutted road. During the brief period the wheels are clear of the pavement if you have your foot on the gas the engine will speed up and the drive shaft with the pinion gear on the end will speed up several times the speed of the car and so will the rear wheels. When the wheels reconnect with the pavement something has to give and since there are only a few teeth engaged between the ring and pinion and it can break the teeth off either or both.


When in high school some friends and I were traveling down the road in a 1928 Model A at about 45 MPH when we went over some very rough rail road tracks. The driver kept his foot on the gas and it cleaned off all the teeth on the pinion gear. Moral to the story, take your foot off the gas when going over rail road tracks or speed bumps.


Tom Endy
Tom Endy is offline   Reply With Quote
Old 10-05-2018, 08:27 PM   #9
Will Ziegler in LI NY
Senior Member
 
Will Ziegler in LI NY's Avatar
 
Join Date: May 2010
Location: East Northport, NY
Posts: 156
Default Re: Broken ring gear

I had a part of a tooth broken on a ring gear along with bad (loose and sloppy) pinion bearings. I believe the bad bearings let the pinion move and get out of alignment with the ring gear causing the damage.
Will Ziegler in LI NY is offline   Reply With Quote
Old 10-06-2018, 06:37 AM   #10
Frank Miller
Senior Member
 
Frank Miller's Avatar
 
Join Date: May 2010
Location: Auburn, MA
Posts: 1,539
Default Re: Broken ring gear

Thanks fr all the help. The Tom Endy articles were great.
__________________
“The technique of infamy is to start two lies at once and get people arguing heatedly over which is true.” ~ Ezra Pound
Frank Miller is offline   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

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 01:28 AM.