Upper control arm bolts - Alfa Romeo Bulletin Board & Forums
 1Likes
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 20 (permalink) Old 06-25-2018, 10:38 AM Thread Starter
Registered User
 
redskinroll's Avatar
 
Join Date: Nov 2015
Location: Fairfax, Virginia
Posts: 8
Garage
Upper control arm bolts

I have searched for this nugget of info and came up empty. I am replacing at least one of the bolts that runs through the upper control arm where it passes through the body below the shock mount on my '84 GTV6. While attempting to replace the bushings, I ran into the somewhat common problem of a stuck bolt. No amount of persuading + pb blaster budged it. Am sawing at least the driver's side out. My question is: what are the specs on that bolt? I want to get it right, instead of finding something that "fits" to my eye, and risking not getting it right.

Can anyone enlighten me?

Thanks
redskinroll is offline  
Sponsored Links
Advertisement
 
post #2 of 20 (permalink) Old 06-25-2018, 11:15 AM
Senior Member
Platinum Subscriber
 
alfaparticle's Avatar
 
Join Date: Oct 2004
Location: Columbia SC
Posts: 12,946
It is possible that nobody other than Alfa Romeo knows that bolt spec but there will be folks who will guess and say grade such and such. I would call APE and see if Larry has good used original bolts.

Ed Prytherch
79 Spider
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
alfaparticle is online now  
post #3 of 20 (permalink) Old 06-25-2018, 04:11 PM
USTA BE AN AD-MIN
Platinum SubscriberAdministrator
 
ossodiseppia's Avatar
 
Join Date: Oct 2003
Location: Broomfield, Colorado U.S.A
Posts: 11,014
Garage
These are usually grade 10.

If you post a picture of the fastener and measurements, I'll look and see what I have. I know I have some suspension fasteners from an Alfetta.

Brian __________________________________
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.




To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
ossodiseppia is online now  
Sponsored Links
Advertisement
 
post #4 of 20 (permalink) Old 06-25-2018, 04:38 PM
Registered User
 
Tom Frasca's Avatar
 
Join Date: Dec 2016
Location: New York
Posts: 1,752
Garage
Quote:
Originally Posted by redskinroll View Post
I have searched for this nugget of info and came up empty. I am replacing at least one of the bolts that runs through the upper control arm where it passes through the body below the shock mount on my '84 GTV6. While attempting to replace the bushings, I ran into the somewhat common problem of a stuck bolt. No amount of persuading + pb blaster budged it. Am sawing at least the driver's side out. My question is: what are the specs on that bolt? I want to get it right, instead of finding something that "fits" to my eye, and risking not getting it right.

Can anyone enlighten me?

Thanks
Before you go cutting anything try this.... Fire and Ice: How to free stuck nuts and bolts and fasteners on a marine engine.

The older I get.. the faster I was....
Tom
Tom Frasca is offline  
post #5 of 20 (permalink) Old 06-25-2018, 05:28 PM
PSk
Registered User
 
Join Date: May 2003
Location: Tauranga New Zealand
Posts: 11,556
Send a message via AIM to PSk Send a message via Yahoo to PSk
Quote:
Originally Posted by ossodiseppia View Post
These are usually grade 10.
8.8?

Pete

'71 1750 Series 2 GTV:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
156 Series 1 v6 ... and remember it's all just opinions
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
PSk is offline  
post #6 of 20 (permalink) Old 06-25-2018, 06:12 PM
Senior Member
Platinum Subscriber
 
alfaparticle's Avatar
 
Join Date: Oct 2004
Location: Columbia SC
Posts: 12,946
Grade 10 refers to tensile strength but these bolts are loaded in shear.

Ed Prytherch
79 Spider
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
alfaparticle is online now  
post #7 of 20 (permalink) Old 06-25-2018, 06:21 PM
PSk
Registered User
 
Join Date: May 2003
Location: Tauranga New Zealand
Posts: 11,556
Send a message via AIM to PSk Send a message via Yahoo to PSk
Quote:
Originally Posted by alfaparticle View Post
Grade 10 refers to tensile strength but these bolts are loaded in shear.
Different grades of bolts have different shear strength too. See chart attached, from Metric Fastener selection tips, lessons, torques, tools and chart | Adventure Rider

I always thought cars used grade 8.8 ... but ossodiseppia probably knows Alfas better than me (by a long way).
Pete
Attached Images
 

'71 1750 Series 2 GTV:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
156 Series 1 v6 ... and remember it's all just opinions
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
PSk is offline  
post #8 of 20 (permalink) Old 06-26-2018, 07:05 AM
Registered User
 
Join Date: Jul 2016
Posts: 274
they are class 8.8 as are almost all alfa hex head bolts. there are a few exceptions (like flywheel bolts) but 99% - ish are 8.8. when you get the bolt out, will be stamped on the hex head.
any of the socket head cap screws are 10.9 or 12.9 - 'cause that is the way they are all made.
"grade" refers to inch fasteners.
barboncino105 is offline  
post #9 of 20 (permalink) Old 06-26-2018, 07:35 AM
USTA BE AN AD-MIN
Platinum SubscriberAdministrator
 
ossodiseppia's Avatar
 
Join Date: Oct 2003
Location: Broomfield, Colorado U.S.A
Posts: 11,014
Garage
Quote:
Originally Posted by barboncino105 View Post
they are class 8.8 as are almost all alfa hex head bolts. there are a few exceptions (like flywheel bolts) but 99% - ish are 8.8. when you get the bolt out, will be stamped on the hex head.
any of the socket head cap screws are 10.9 or 12.9 - 'cause that is the way they are all made.
"grade" refers to inch fasteners.
I'm sorry, I thought these two large screws were for the upper control arms. My mistake.

The parts manual does not list the specs on the screws.
Attached Images
 

Brian __________________________________
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.




To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
ossodiseppia is online now  
post #10 of 20 (permalink) Old 06-26-2018, 08:17 AM
Registered User
 
divotandtralee's Avatar
 
Join Date: Nov 2005
Location: Cape Cod, MAssachusetts
Posts: 7,285
Quote:
Originally Posted by redskinroll View Post
I have searched for this nugget of info and came up empty. I am replacing at least one of the bolts that runs through the upper control arm where it passes through the body below the shock mount on my '84 GTV6. While attempting to replace the bushings, I ran into the somewhat common problem of a stuck bolt. No amount of persuading + pb blaster budged it. Am sawing at least the driver's side out. My question is: what are the specs on that bolt? I want to get it right, instead of finding something that "fits" to my eye, and risking not getting it right.

Can anyone enlighten me?

Thanks
I have not seen many bolts NOT undone with an air gun.
divotandtralee is online now  
post #11 of 20 (permalink) Old 06-26-2018, 08:20 AM Thread Starter
Registered User
 
redskinroll's Avatar
 
Join Date: Nov 2015
Location: Fairfax, Virginia
Posts: 8
Garage
Thanks for all of the input! A mechanic at DiFatta told me yesterday that it is either an M10 or 12(the new bush will be snug but not require force to get the bolt through(he said), smooth shank to run through the bushing, and not any specific or out of the ordinary spec on hardness or strength, as stressors on the whole assembly are attenuated by the bushing. I will update my success for the benefit of others, hopefully by Saturday!
redskinroll is offline  
post #12 of 20 (permalink) Old 06-26-2018, 08:39 AM
Registered User
 
Join Date: Jul 2016
Posts: 274
they are M10. now, ossodiseppia has me worried! my notes do not show anything specific on them... as i recall, they are class 8.8... but not as confident in the recall these days. in any case, the heads will be marked, just get the same thing.
barboncino105 is offline  
post #13 of 20 (permalink) Old 06-26-2018, 08:41 AM
Registered User
 
fourmotioneer's Avatar
 
Join Date: Aug 2013
Location: Detroit Metro
Posts: 656
Quote:
Originally Posted by alfaparticle View Post
It is possible that nobody other than Alfa Romeo knows that bolt spec but there will be folks who will guess and say grade such and such. I would call APE and see if Larry has good used original bolts.
Hi

Quote:
Originally Posted by alfaparticle View Post
Grade 10 refers to tensile strength but these bolts are loaded in shear.
Double shear too, so not a particularly difficult job for the fastener. Class 10.9 of known quality should be fine.

Graham
88 Milano Verde, 13 500 Abarth, 04 Used Maserati Coupe GT
fourmotioneer is offline  
post #14 of 20 (permalink) Old 06-26-2018, 10:06 AM
Registered User
 
Join Date: Apr 2015
Posts: 35
From my notes:

"New M10x100 fine thread bolts and nylocs. Plenty of anti-seize required between the bolt and the bushing."

Note that it's important they are fine thread. 1.25mm pitch

Also from my notes and the manual, the torque
upper arm to chassis - 39 to 44 Nm
mistamun is offline  
post #15 of 20 (permalink) Old 06-26-2018, 10:36 AM
Registered User
 
Join Date: Jul 2016
Posts: 274
that is 28.8>32.5 ft lbs
barboncino105 is offline  
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



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