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Old 06-16-2021, 07:51 PM   #1
Conaway2
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Default Front Cross Member Question

The front cross member on the frame of my newly-acquired ‘29 sport coupe project is not riveted, but bolted- and not all the bolts are apparently there. As I recall, these frame members were all riveted, weren’t they ??

Thanks - Jim
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Old 06-16-2021, 08:46 PM   #2
Oldbluoval
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Default Re: Front Cross Member Question

Rivets
And the ones on top need to be flush with the frame otherwise
fender mount problem
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Old 06-16-2021, 08:47 PM   #3
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Default Re: Front Cross Member Question

Rivets
And the ones on top need to be flush with the frame otherwise
fender mount problem


Not sure about double post! Oh well
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Old 06-18-2021, 04:47 PM   #4
john in illinois
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Default Re: Front Cross Member Question

It is probably a replacement. The owner used bolts instead of rivets.
If all the bolts are there it would be easier just to use it.
Replace missing bots and check all for tight.

If you decided to rivet you may find holes were drilled larger for bolts.

I have a friend that has driven for several years with bolted x member.

John
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Old 06-18-2021, 08:16 PM   #5
Conaway2
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Default Re: Front Cross Member Question

Thanks for all the responses. I’ll keep this crossmember, as it’s in very good shape. I will put the missing bolts in. I’d like to find good quality carriage bolts for the holes on top of the frame- any suggestions ?

Thanks - Jim
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Old 06-18-2021, 08:24 PM   #6
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Default Re: Front Cross Member Question

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McMaster-Carr has Grade 8 carriage bolts in all sizes.
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Old 06-18-2021, 09:56 PM   #7
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Default Re: Front Cross Member Question

Carriage bolts won’t get it
Frame needs to be flush so fenders will lay flat
Flat head machine screws with nuts underneath as a minimum
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Old 06-19-2021, 07:06 AM   #8
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Default Re: Front Cross Member Question

Quote:
Originally Posted by Oldbluoval View Post
Carriage bolts won’t get it
Frame needs to be flush so fenders will lay flat
Flat head machine screws with nuts underneath as a minimum
Contact Bolt Depot in MA. You can get the six necessary 1/4" recessed bolts that will be flush with the top of frame including the other 8 bolts for the sides and bottoms of the frame in #8.
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Old 06-19-2021, 11:17 AM   #9
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Default Re: Front Cross Member Question

Quote:
Originally Posted by sofield View Post
the other 8 bolts for the sides and bottoms of the frame in #8.
#8?, #8 is only about 5/32" OD
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Old 06-19-2021, 04:34 PM   #10
john in illinois
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Default Re: Front Cross Member Question

He probably meant grade 8 or maybe not.

John
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Old 06-19-2021, 05:55 PM   #11
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Default Re: Front Cross Member Question

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Originally Posted by john in illinois View Post
He probably meant grade 8 or maybe not.

John
I did mean grade #8
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Old 06-20-2021, 07:42 AM   #12
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Default Re: Front Cross Member Question

Thanks to everyone - I did find grade 8 bolts at McMaster-Carr and the Bolt Depot.

Jim
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Old 06-20-2021, 08:37 AM   #13
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Default Re: Front Cross Member Question

My Coupe has 50,000 miles on a bolted-in front crossmember. However the bolts are line fit into their holes for excellent shear, and the bolts are a high tensile strength for tension. There are not gaps between the crossmember and frame rails.
If you rivet the crossmember, the rivets must fill their holes.
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Old 06-20-2021, 10:25 AM   #14
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Default Re: Front Cross Member Question

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Originally Posted by john in illinois View Post
He probably meant grade 8 or maybe not.

John
Thanks, grade 8 would make more sense than #8
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Old 06-20-2021, 02:02 PM   #15
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Default Re: Front Cross Member Question

Mine was welded in.
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