Author Topic: Fan Shroud Bolt  (Read 9232 times)

sdkar

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Fan Shroud Bolt
« on: November 26, 2009, 01:56:36 AM »
I have this 12 pointed bolt with built in washer top dead center that holds the fan shroud to an L bracket.  Is this the proper bolt or did GM just use a regular 6 point bolt?


Sauron327

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Re: Fan Shroud Bolt
« Reply #1 on: November 26, 2009, 01:59:16 AM »
Throw that bolt in the rubbish.

Jerry@CHP

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Re: Fan Shroud Bolt
« Reply #2 on: November 26, 2009, 02:20:01 AM »
3/8" indented head with built in flat washer for '69.  Every '69 you see has the incorrect bolt in it!

Jerry

GaryL

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Re: Fan Shroud Bolt
« Reply #3 on: November 26, 2009, 03:09:19 AM »
3/8" indented head with built in flat washer for '69.  Every '69 you see has the incorrect bolt in it!

Jerry

3/8" diameter or wrench size?
Gary

Lemans Blue X33. DZ, M20, manual steering. Only BU code rear end is original.

BlackoutSteve

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Re: Fan Shroud Bolt
« Reply #4 on: November 26, 2009, 08:07:22 AM »
Do 69 BB and SB the same bolt? 9419380..

AIM only shows "V8 engine". Nothing in L35.
Any pictures of an original? ..Please..  :-* ;D
Restoring my RHD 69 Jane in Melbourne, Australia.
http://www.usmuscle.com.au/Forum/showthread.php?t=2840

Gramps69Z

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Re: Fan Shroud Bolt
« Reply #5 on: November 26, 2009, 03:35:20 PM »
 

 

 


The bolt size would be 3/8 not the head or wrench size.
Captain John Wykoff
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plumL78

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Re: Fan Shroud Bolt
« Reply #6 on: November 26, 2009, 03:44:38 PM »
3/8 is the correct wrench size and the bolt is 5/16

JohnZ

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Re: Fan Shroud Bolt
« Reply #7 on: November 26, 2009, 05:54:35 PM »
Here's the original fan shroud bolt.
'69 Z/28
Fathom Green
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68Zproject

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Re: Fan Shroud Bolt
« Reply #8 on: November 26, 2009, 07:59:50 PM »
3/8" indented head with built in flat washer for '69.  Every '69 you see has the incorrect bolt in it!

Jerry

What about 68?
68Z28

GaryL

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Re: Fan Shroud Bolt
« Reply #9 on: November 26, 2009, 09:15:40 PM »
Here's the original fan shroud bolt.

AMK catalogue shows 1/4" diameter and 3/8" flange head, part # 9419380 from the AIM. Also AIM # 120386 flat washer.
« Last Edit: November 26, 2009, 09:50:27 PM by GaryL »
Gary

Lemans Blue X33. DZ, M20, manual steering. Only BU code rear end is original.

Jerry@CHP

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Re: Fan Shroud Bolt
« Reply #10 on: November 27, 2009, 02:23:05 AM »
'67 and '68 use a 1/2" indented head (wrench size), bolt is actually 5/16 x 18,

Jerry

Marty

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Re: Fan Shroud Bolt
« Reply #11 on: November 28, 2009, 05:39:37 AM »
In 68 the part number is 3846202, 5/16" x 18 x 7/8". Same bolt that's used on the hood pin plate to the hood and for the front shock absorbers. It has a captured washer. The ones I have are RBW head markings.

Martin
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BlackoutSteve

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Re: Fan Shroud Bolt
« Reply #12 on: November 29, 2009, 08:44:05 AM »
3846202 is a regular body bolt with a much smaller 3/4" conical washer and wouldn't be correct for 69. Definitely different to John Z's example.

The same bolt with a 1" captured conical washer would be AMK's B-12113 on pg 103.

The question from me is..
Does the 69 bolt have a captured washer and is the washer with this bolt flat? Conical washers are intended for more torque than a plastic shroud can take.
Restoring my RHD 69 Jane in Melbourne, Australia.
http://www.usmuscle.com.au/Forum/showthread.php?t=2840

JohnZ

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Re: Fan Shroud Bolt
« Reply #13 on: November 29, 2009, 04:05:36 PM »
The '69 fan shroud bolt is #9419380, not the 5/16"-18 machine thread 202 bolt used in '68; it's a 1/4" sheet metal screw into a special stamped U-nut.
'69 Z/28
Fathom Green
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sixt9x33rs

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Re: Fan Shroud Bolt
« Reply #14 on: December 01, 2009, 12:15:41 AM »
Here's the original fan shroud bolt.

John what headmarking does that bolt have?

Thanks,
'69 RS Z/28 65B, 711 Flat hood no spoiler, endura, 4:10 43K miles
69 X77 Z/28 69 69 711 Original Paint Unrestored (Sold)
'69 X66 Convertible 69B 712 auto, (Sold) 44K miles