Register Login
FIAT Auto Specialist Team
Reply
 
Thread Tools
Old 26-12-2018   #1
Join Date: Dec 2018
Posts: 10
Thanks: 0
Trader Rating: 0
USA 
Transmission Rebuild

I am going to attempt to rebuild the transmission of my 78 124 Spider. I am not a mechanic (not even close) and this will be the first time I've even SEEN a transmission up front. I'll be taking photos as I go and asking for your valuable opinions and comments.

This is a starting photo after I took off the plate with the drain plug. Is the resolution sufficient and is the photo close enough to be useful...trying to gauge how to take the remainder of the photos. (if you see anything that needs addressing or appears broken please let me know!!)

Thanks All!
Attached Thumbnails
Click image for larger version

Name:	Transmission.jpg
Views:	17
Size:	146.6 KB
ID:	196127  
Likes Pugglt Auld Jock, Pickwick liked this post
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

Karlton is offline Reply With Quote Quote 
Old 31-12-2018   #2
Join Date: Oct 2018
Posts: 4
Thanks: 0
Trader Rating: 0
United Kingdom 
Re: Transmission Rebuild

It sounds like you`re being very brave. For a reluctant mechanic the gearbox is probably not the best place to start! Why are you pulling it apart? What are the symptoms? I won`t be much help to you though because I`ve only ever been in a gearbox once. (Not a Fiat). Just be careful of what falls out when you move anything! Spacers are the worst things for bafflement I`ve found. Take plenty pics.
Good luck.
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

Colin916 is offline Reply With Quote Quote 
Old 02-01-2019   #3
Join Date: Jan 2014
Posts: 824
Thanks: 109
Trader Rating: 0
Ireland 
Re: Transmission Rebuild

I've rebuilt a few of these gearboxes (transmissions), was a Fiat Dealership Mechanic, back in the 70's.

They're a pretty reliable unit, main problems are synchro wear on 3rd + possibly 2nd gears and bearing wear after a high mileage. Occasionally, the tip of the mainshaft that runs in the needle roller bearing inside the input shaft wears also.

A decent workshop manual would be very useful to guide you.

3 tips about disassembling this gearbox :-

1. First, remove the reverse (back-up) light switch from the rear of the gearbox before starting work, otherwise it's easily damaged.

2. To loosen the large nut on the output shaft (rear of gearbox at rubber doughnut coupling) and the bolt on the front of the layshaft (2nd motion shaft ), visible when the bellhousing is removed, - engage 2 gears at once to lock the gear shafts. This can be done by first engaging any forward gear, then remove the 10mm headed pinch bolt from another selector fork and engage another forward gear.

To remove the circlips compressing the 'Belleville' spring washers on the other shafts, it's easiest to use a hammer and drift to pop them off and fit new ones on reassembly. Compressing these Belleville washers can be difficult without the correct Fiat special tools but when you get to the reassembly stage, I can give you some suggestions on how to do this at home. Incidentally, when fitting new circlips, they should be fitted with their 'square' edge away from the Belleville washers, otherwise they may pop off in use.

When you have the gearbox disassembled and cleaned, post pics of anything
you want a second opinion on and I or, I'm sure, others on here will try to help.

AL.
Thanks Karlton thanked for this post
Likes Pugglt Auld Jock, KungFooPanda liked this post
__________________
If what I write is helpful please click on the 'thanks' button, (smiley face on lower right).

Last edited by F123C; 02-01-2019 at 22:15.
F123C is offline Reply With Quote Quote 
Old 04-02-2019   #4
Join Date: Dec 2018
Posts: 10
Thanks: 0
Trader Rating: 0
USA 
Re: Transmission Rebuild

You hit the nail on the head with your tip about removing the donut. I was just going to post and ask for suggestions.
Attached Thumbnails
Click image for larger version

Name:	_DSC0030.JPG
Views:	8
Size:	2.24 MB
ID:	197211   Click image for larger version

Name:	_DSC0031.JPG
Views:	9
Size:	1.96 MB
ID:	197212  

__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

Karlton is offline Reply With Quote Quote 
Old 02-03-2019   #5
Join Date: Dec 2018
Posts: 10
Thanks: 0
Trader Rating: 0
USA 
Re: Transmission Rebuild

Just needed an impact wrench. A few more photos after removing the bell housing
Attached Thumbnails
Click image for larger version

Name:	DSC_0011.JPG
Views:	8
Size:	2.03 MB
ID:	198285   Click image for larger version

Name:	DSC_0015.JPG
Views:	7
Size:	1.93 MB
ID:	198286  

Click image for larger version

Name:	DSC_0016.JPG
Views:	7
Size:	1.71 MB
ID:	198287   Click image for larger version

Name:	DSC_0020.JPG
Views:	9
Size:	1.81 MB
ID:	198288  

Click image for larger version

Name:	DSC_0025.JPG
Views:	7
Size:	2.02 MB
ID:	198289  
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

Karlton is offline Reply With Quote Quote 
Old 03-03-2019   #6
Join Date: Dec 2018
Posts: 10
Thanks: 0
Trader Rating: 0
USA 
Re: Transmission Rebuild

What's the best way to take off the round spacer on the output shaft?
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

Karlton is offline Reply With Quote Quote 
Old 03-03-2019   #7
Join Date: Dec 2018
Posts: 10
Thanks: 0
Trader Rating: 0
USA 
Re: Transmission Rebuild - How to Remove Spacer

Any suggestions for removing the round spacer on the output shaft? I don't want o damage it with a wrench..appears to be screwed on. Here's a picture.
Attached Thumbnails
Click image for larger version

Name:	DSC_0028.JPG
Views:	13
Size:	1.65 MB
ID:	198319  
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

Karlton is offline Reply With Quote Quote 
Old 26-05-2019   #8
Join Date: May 2019
Posts: 3
Thanks: 0
Trader Rating: 0
Canada 
Re: Transmission Rebuild - How to Remove Spacer

No answers, i hop you got it off by now.
What i did is is pried it off using two bars on resting on one of the three eyelets and the other wedged under the spacer after that i alternated the prying one lob at a time, this will kill the rubber bushing behind it.
The spacer is NOT screw on it is a very tight fit.
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

alainm is offline Reply With Quote Quote 
Reply
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

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
(T) Transmission - transmission fluid. Pyabbi Grande Punto 5 01-10-2018 00:31
(T) Plans for 650 engine and transmission rebuild jjacob 500 (Classic) 27 07-12-2016 18:00
Need Transmission Rebuild on a 77 Fiat 124 Spider - DENVER - Recommendations? Gemma77 Garages 0 14-04-2015 19:40
(G) The Rebuild! danny hgt Punto (Mk2/2b) 8 16-03-2007 21:31