Author Topic: Big block rear drive question  (Read 689 times)

Offline Scout63

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Big block rear drive question
« on: December 08, 2022, 07:40:44 AM »
1979 G5 - Should the outer race in the inner bearing (part 27 here) be a tight interference fit into the rear drive case?  On mine it just falls out.  Otherwise the bearing seems fine.  Should I loctite the race in?  Im replacing the inner oil seal.  As always, thanks to the pros here. Ben



Ben Zehnder - Orleans, MA USA

Offline guzzisteve

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Re: Big block rear drive question
« Reply #1 on: December 08, 2022, 08:15:52 AM »
Should be interference fit, if it's been spinning in there it could have removed some aluminum. Use the green bearing retainer. Usually they don't fall out unless it's warmed up.
"Pray through Carlo & your bike shall be healed"
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Offline 1down5up

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Re: Big block rear drive question
« Reply #2 on: December 08, 2022, 01:48:22 PM »
Yes, should be a tight fit, I have had them walk "upwards" on me on 1 diff was overhauling.

The earlier deep sump diff (v7 sport etc) actually had a small retaining plate that bolted in to hold it down, not sure why they got rid of this feature


Offline lucian

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Re: Big block rear drive question
« Reply #3 on: December 08, 2022, 04:37:11 PM »
Like Steve said, bearing retainer , I would also dimple the aluminum case bore in several spots with a center punch around its circumference near the center of the race depth to tighten the fit.

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Re: Big block rear drive question
« Reply #3 on: December 08, 2022, 04:37:11 PM »

Online n3303j

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Re: Big block rear drive question
« Reply #4 on: December 08, 2022, 07:50:55 PM »
Always had to cook the housing for easy extraction.
I would not dimple the bore as you will distort the race and shorten the bearing life.
Get all components very clean.
Wipe bearing bore with Loctite SF 7649 primer and let it dry.
Apply Loctite RC 680 to the bearing AND a bit on the beginning of the bore.
Slide and rotate the bearing as you push it to the bottom of the bore.
Wipe off the excess Loctite and leave housing at room temp for 24 hours.
(Fixtures in about 15 minutes, full cure 24 hours @ 68F)
The resulting bond has a shear strength of about 2,000 lbs / Sq In.
It's impervious to final drive lubricants, etc.
'98 MG V11 EV
'96 URAL SPORTSMAN
'77 MG 850T3 FB

Offline Scout63

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Re: Big block rear drive question
« Reply #5 on: December 09, 2022, 06:36:13 AM »
Thanks everyone. Great explanations.  I have green Loctite on order.  Ben
Ben Zehnder - Orleans, MA USA

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Re: Big block rear drive question
« Reply #6 on: December 09, 2022, 09:02:01 AM »
Be aware "Green Loctite" is a generic description of this company's product.
Loctite has a large variety of green colored products.
Some are cylindrical bonding compounds.
Others are thread retaining or sealing compounds.
They are designed for different applications and have different strengths.
Each works best in specified applications,clearances and environments.

I specified RC 680 (Green) Loctite because it is the best choice for retaining a slip fit bearing in a bore submerged in hot oil.
'98 MG V11 EV
'96 URAL SPORTSMAN
'77 MG 850T3 FB

Offline guzzisteve

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Re: Big block rear drive question
« Reply #7 on: December 09, 2022, 10:14:23 AM »
I believe book calls for #609, for everything you need it on, many different greens. They (Loctite) have a book I got in 90's for all their products. Some are for different metals used. I been using 609, big bottle.
« Last Edit: December 09, 2022, 10:16:26 AM by guzzisteve »
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Re: Big block rear drive question
« Reply #8 on: December 09, 2022, 11:02:59 AM »
Book is describing product to be used for proper fitting interfaces.
The application here is a fit that is beyond normal tolerances.
680 retains shear strength at gaps of 0.010".
'98 MG V11 EV
'96 URAL SPORTSMAN
'77 MG 850T3 FB

Offline Tom

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Re: Big block rear drive question
« Reply #9 on: December 09, 2022, 12:13:36 PM »
Y'ep totally agree with the previous posts.  Definitely shouldn't fall out as described.
From the Deep Deep South out in left field.  There are no stupid questions.  There are however stupid people asking questions.  🤣, this includes me.  😉

Offline guzzisteve

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Re: Big block rear drive question
« Reply #10 on: December 09, 2022, 12:19:54 PM »
Also have big bottle of 648 & 680, my 1st rear drive was in 85, been at this a while. Doing junk bmw's too!

It's important to inspect the side of the caged rollers, specially side that rides on the hub(sometimes sharp) not so much next to wear washer. I've seen these trashed & ground on by the hub. Good Luck
« Last Edit: December 09, 2022, 04:08:43 PM by guzzisteve »
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Offline Scout63

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Re: Big block rear drive question
« Reply #11 on: December 09, 2022, 08:53:46 PM »
Be aware "Green Loctite" is a generic description of this company's product.
Loctite has a large variety of green colored products.
Some are cylindrical bonding compounds.
Others are thread retaining or sealing compounds.
They are designed for different applications and have different strengths.
Each works best in specified applications,clearances and environments.

I specified RC 680 (Green) Loctite because it is the best choice for retaining a slip fit bearing in a bore submerged in hot oil.

I should have more specific Ron.  I did order Loctite 680.  After reading all of the descriptions it seemed the right product. Ben
Ben Zehnder - Orleans, MA USA

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Re: Big block rear drive question
« Reply #12 on: December 09, 2022, 09:15:04 PM »
It's been a bit since I've paid attention to a joint made with primer.
I just watched a Loctite video using 680 and Primer.
Seems the primer sets the product in 10 seconds (not minutes).
Now I remember re-sleeving a master cylinder bore and having the sleeve stop half way in.
I had to ream it out and start over.
So if using primer "rehearse" your installation and be sure the insertion is an easy 5 second task.
Otherwise skip the primer.
'98 MG V11 EV
'96 URAL SPORTSMAN
'77 MG 850T3 FB

Offline Scout63

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Re: Big block rear drive question
« Reply #13 on: December 10, 2022, 07:03:43 AM »
No primer. Im not in a rush to complete this. Thanks for opening my eyes Ron. Ben
Ben Zehnder - Orleans, MA USA

 

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