Rear Axle / Differential Teardown & Reassembly - Page 3 - Alfa Romeo Bulletin Board & Forums
 1Likes
Reply
 
LinkBack Thread Tools Display Modes
post #31 of 46 (permalink) Old 07-09-2019, 06:24 PM Thread Starter
Senior Member
Gold Subscriber
 
crackie's Avatar
 
Join Date: Jul 2013
Location: Portland, OR
Posts: 907
This was my list...all from Classic Alfa. If you're doing your hand brakes, you may need some additional parts depending on their condition.

pan gasket https://classicalfa.com/gb052-differ...ket-2000-cars/
oil filler plug https://classicalfa.com/gb062-oil-fi...-differential/
2 bearings (kit includes seals, and shrink rings) https://classicalfa.com/su023hd-fag-...l-bearing-kit/
3 Long tab washers https://classicalfa.com/gb073-differ...her-left-side/
4 Short tab washers https://classicalfa.com/gb074-differ...er-right-side/
2 - copper oil plug rings https://classicalfa.com/en091-sump-plug-washer/
2 - e-brake cable rubber gaiter (not needed if you are replacing the cables) https://classicalfa.com/br078-handbr...rubber-gaiter/
e-brakes shoes https://classicalfa.com/br051-handbrake-shoes-set-of-4/
e-brake cable end - left https://classicalfa.com/br055-handbr...ble-left-side/
e-brake cable end - right https://classicalfa.com/br056-handbr...e-cable-right/

--Scott
Current: 85 GTV6, 69 Duetto, 17 Giulia, 74 GTV
Past: 65 Giulia Sprint GT, 77 Alfetta, 79 Alfetta, 87 Milano Gold, 74 GTV (Euro)

Last edited by crackie; 07-12-2019 at 09:58 AM.
crackie is online now  
Sponsored Links
Advertisement
 
post #32 of 46 (permalink) Old 07-11-2019, 07:49 PM
Excellent write up - going into my file...
jthames likes this.

The Brad Davisson Memorial Scholarship Fund:

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
gprocket is offline  
post #33 of 46 (permalink) Old 07-12-2019, 09:59 AM Thread Starter
Senior Member
Gold Subscriber
 
crackie's Avatar
 
Join Date: Jul 2013
Location: Portland, OR
Posts: 907
@gprocket - thanks for your video. Was super helpful to me.

--Scott
Current: 85 GTV6, 69 Duetto, 17 Giulia, 74 GTV
Past: 65 Giulia Sprint GT, 77 Alfetta, 79 Alfetta, 87 Milano Gold, 74 GTV (Euro)
crackie is online now  
Sponsored Links
Advertisement
 
post #34 of 46 (permalink) Old 07-12-2019, 05:58 PM Thread Starter
Senior Member
Gold Subscriber
 
crackie's Avatar
 
Join Date: Jul 2013
Location: Portland, OR
Posts: 907
Powder coated.

It won't be on the car for quite awhile, but I actually asked the same question before removing the "big" axle tube and got advice that removing it (and even pulling out the LSD mechanism) would not disturb anything.

Someone smarter than me can answer the question definitively.

--Scott
Current: 85 GTV6, 69 Duetto, 17 Giulia, 74 GTV
Past: 65 Giulia Sprint GT, 77 Alfetta, 79 Alfetta, 87 Milano Gold, 74 GTV (Euro)
crackie is online now  
post #35 of 46 (permalink) Old 07-12-2019, 09:36 PM
Registered User
 
goats's Avatar
 
Join Date: Jul 2006
Location: san diego CA
Posts: 5,079
Caution about powder coating. The reason is that the bearing shell for crown wheel is embedded in the axle tube— as is the sealing surface for the diff assembly. So if you decide to powder coat then make sure the sealing surface and the inside is masked. How how do they bake it these days on powder coat?

Personally I think powder coat is a colossal waste of time and money on this. It should be painted. That way it can be easily touched up. Plus it’s way cheaper and the axle tubes came from factory painted. NO ONE following you on the road will even see these, much less know if you powder coated. Save your money and hassle and paint with satin black rattle can rustoeum. That way you will be able to use the welded tabs to secure the brake lines

74 GTV with 10548's and Ingram pump
71 Spider 1750 BOMBER ; 1995 LS 78K tight fast car
goats is online now  
post #36 of 46 (permalink) Old 07-12-2019, 09:41 PM
Registered User
 
goats's Avatar
 
Join Date: Jul 2006
Location: san diego CA
Posts: 5,079
PS you did a BEAUTIFUL job! Now that it’s done and powder coated it is fantastic!!

74 GTV with 10548's and Ingram pump
71 Spider 1750 BOMBER ; 1995 LS 78K tight fast car
goats is online now  
post #37 of 46 (permalink) Old 07-14-2019, 08:00 AM
Senior Member
Gold Subscriber
 
Join Date: Nov 2006
Location: 30044 Lawrenceville,Georgia..30 miles NNE of Atlanta
Posts: 1,071
Quote:
Originally Posted by gigem75 View Post
There are shims in the big side tube but they are behind the bearing race so nothing will fall out. If you do remove it make sure you re torque the 14mm nuts to spec. I use Permatex 51813 Anaerobic Gasket Maker, 50 ml Tube on the flanges.
I've been told(and respect the guy who told me)to not remove a left side axle tube because by simply removing and replacing that tube(even when re-using the original carrier bearing and shims) will affect ring and pinion settings,gear mesh/backlash/total pre-load,possibly causing unwanted whine or noise.I'm just guessing that using "any" amount of sealant would have additional affect on the R/P relationship.Can someone whose actually done this with a good,used rear end and had success please chime in,it's very important.
alphil is offline  
post #38 of 46 (permalink) Old 07-14-2019, 08:26 AM
Senior Member
Gold Subscriber
 
gigem75's Avatar
 
Join Date: Aug 2008
Location: East Texas
Posts: 6,266
I've made my own tool to measure from center of ring gear to pinion face. Then incorporate the value stamped on the face of the pinion by the factory to determine the shims needed to go behind the race of the inner pinion bearing to attain that distance. I guess the point I'm trying to make is I've rebuilt several rear ends with Timken bearings to factory specs for pinion and crown lash, pinion preload, and inner bearing preload. The anaerobic permatex is great for the big tube and if it goes back together clean with the same bearings the preloads shouldn't be affected. They get taken apart and put back together enough just to get the shim thickness correct that r&r_ing the left tube is no big deal.
Here is a link that might be helpful...
https://www.alfabb.com/bb/forums/gea...g-preload.html

The passenger seat is 15 miles an hour faster than the drivers seat.

currently
2017 Giulia Q4
74 GTV restored daily driver
71 Berlina in 2L restored driver
the ones that got away:
1959 750 series Giulietta Spider Veloce
1962 Giulietta Spider normale
1965 Giulia Sprint normale
1972 GTV
1974 GTV
1974 GTV
1977 Spider
1974 Spider
gigem75 is offline  
post #39 of 46 (permalink) Old 07-14-2019, 09:54 AM
Registered User
 
goats's Avatar
 
Join Date: Jul 2006
Location: san diego CA
Posts: 5,079
the anaerobic sealant works just fine. There is a DANA diff shim kit that I posted a year or so ago that fits the crown bearing shim size. Its about 13 bucks.

If you measure well, take your time, and do it right, the diff will be fine.

bob

74 GTV with 10548's and Ingram pump
71 Spider 1750 BOMBER ; 1995 LS 78K tight fast car
goats is online now  
post #40 of 46 (permalink) Old 07-14-2019, 10:47 AM Thread Starter
Senior Member
Gold Subscriber
 
crackie's Avatar
 
Join Date: Jul 2013
Location: Portland, OR
Posts: 907
Re: powder coat vs. rattle can...

Expecting that a non-baked rattle can paint on suspension parts will hold up to rocks, etc. is probably wishful thinking. I drive my cars a lot, so optimize for durability where it makes sense. Rattle can paint certainly won't hold up as well as powder coating, but it will be easier to fix if a chip does happen. As usual, everything has tradeoffs. If I hadn't powder coated I would've used POR, which is more durable in this application than rattle can and can also be repaired in the event of chips. Not to mention POR is easy to make look nice, which is important since I am a crappy painter.

As for cost, yes, doing the tubes by themselves would've been a waste of $$. But I was doing pretty much everything you'd want to powder coat on a car and got it all done for ~$200. So made the cost of doing these tubes about $20...about the same as a can of top shelf rattle can paint.

As @goats pointed out, it is absolutely a must for any part getting powder coated that the mating surfaces and threads get masked off. Also since parts get baked, all rubber (bushing, etc.) will be ruined in the process.

Re: the pinion measurements, guess I'll see in a couple years when I install it. There's a lot of voodoo around messing with pinions and backlash. I was told by a couple experienced folks that the way I went about it, since I was changing nothing, would be fine. They could be wrong. I'll report back in a couple years. ;-)

--Scott
Current: 85 GTV6, 69 Duetto, 17 Giulia, 74 GTV
Past: 65 Giulia Sprint GT, 77 Alfetta, 79 Alfetta, 87 Milano Gold, 74 GTV (Euro)

Last edited by crackie; 07-14-2019 at 01:20 PM.
crackie is online now  
post #41 of 46 (permalink) Old 07-14-2019, 11:41 AM
Registered User
 
goats's Avatar
 
Join Date: Jul 2006
Location: san diego CA
Posts: 5,079
Agreed on all and your diff /axle looks fantastic! As you say the incremental cost of a couple tubes etc is cheap!!

Your diff will be fine. If you didnt mess with crown wheel bearings or pinion bearings ( that might change depth) I think you have nothing to worry about in practice. There is a lot of hoo doo on differential. Most of it unwarranted in my humble opinion

74 GTV with 10548's and Ingram pump
71 Spider 1750 BOMBER ; 1995 LS 78K tight fast car
goats is online now  
post #42 of 46 (permalink) Old 07-14-2019, 01:18 PM Thread Starter
Senior Member
Gold Subscriber
 
crackie's Avatar
 
Join Date: Jul 2013
Location: Portland, OR
Posts: 907
Yeah - powder coating is sort of size fits all, at least around Portland. Take them 2 pieces...$150. Take them 20 pieces...$200.

Something that also works well if you’re doing a restoration is that you can also take things in and just have them sandblasted along with everything you’re getting powder coated essentially for free. This is what I did with a few under hood parts that I will rattle can or POR.

--Scott
Current: 85 GTV6, 69 Duetto, 17 Giulia, 74 GTV
Past: 65 Giulia Sprint GT, 77 Alfetta, 79 Alfetta, 87 Milano Gold, 74 GTV (Euro)
crackie is online now  
post #43 of 46 (permalink) Old 07-14-2019, 05:58 PM
Senior Member
Gold Subscriber
 
Join Date: Nov 2006
Location: 30044 Lawrenceville,Georgia..30 miles NNE of Atlanta
Posts: 1,071
OK,removing the left axle housing and reinstalling it with sealant on an extremely clean big axle housing flange and pumpkin,(having made "no" changes internally,ie,same undisturbed carrier and pinion bearings),should not change factory R/P settings and be good to go.Amen.Thank you Torque axle housing flange nuts 18-20ft.lbs.wet or with a little loctite ok?
alphil is offline  
post #44 of 46 (permalink) Old 07-14-2019, 07:03 PM
Senior Member
Gold Subscriber
 
gigem75's Avatar
 
Join Date: Aug 2008
Location: East Texas
Posts: 6,266
yup, nbd, you'll be fine I've used Mitsumi to make shims for the preload on the pinion, the pinion bearing, and the tubes. All three are different. I've had to use a .05mm-.002in to get the preload set right. No voodoo just careful measurement.

The passenger seat is 15 miles an hour faster than the drivers seat.

currently
2017 Giulia Q4
74 GTV restored daily driver
71 Berlina in 2L restored driver
the ones that got away:
1959 750 series Giulietta Spider Veloce
1962 Giulietta Spider normale
1965 Giulia Sprint normale
1972 GTV
1974 GTV
1974 GTV
1977 Spider
1974 Spider
gigem75 is offline  
post #45 of 46 (permalink) Old 07-14-2019, 07:38 PM
Registered User
 
goats's Avatar
 
Join Date: Jul 2006
Location: san diego CA
Posts: 5,079
You don’t need the expensive custom ones for pinion preload. Also pinion depth — use closest standard size. The Dana shim kit for crown wheel depth/preload is cheap!

74 GTV with 10548's and Ingram pump
71 Spider 1750 BOMBER ; 1995 LS 78K tight fast car
goats is online now  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Alfa Romeo Bulletin Board & Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Gear Ratios for Dummies BobG Gearbox, Transaxle, Differential & Propshaft 19 05-30-2016 04:39 AM
Can 1967 Dunlop brakes be transplanted onto 1972 2000 rear axle? tubut Gearbox, Transaxle, Differential & Propshaft 9 11-16-2015 08:25 PM
rear axle 73gtv Sedan (1962-1977) 5 09-27-2007 05:53 AM
Rear Axle / Differential Wil Painter Alfa Romeo Parts For Sale & Wanted 1 05-02-2004 10:14 AM
Rear Axle Rebuild Part I Keven GT (1963-1977) 25 12-31-2003 01:33 PM

Posting Rules  
You may post new threads
You may 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome