CRG Discussion Forum

Camaro Research Group Discussion => Originality => Topic started by: sdkar on November 26, 2009, 01:56:36 AM

Title: Fan Shroud Bolt
Post by: sdkar 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?

Title: Re: Fan Shroud Bolt
Post by: Sauron327 on November 26, 2009, 01:59:16 AM

Throw that bolt in the rubbish.

Title: Re: Fan Shroud Bolt
Post by: Jerry@CHP 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

Title: Re: Fan Shroud Bolt
Post by: GaryL on November 26, 2009, 03:09:19 AM

Quote from: Jerry@CHP 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

3/8" diameter or wrench size?

Title: Re: Fan Shroud Bolt
Post by: BlackoutSteve 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

Title: Re: Fan Shroud Bolt
Post by: Gramps69Z on November 26, 2009, 03:35:20 PM

 

 

 


The bolt size would be 3/8 not the head or wrench size.

Title: Re: Fan Shroud Bolt
Post by: plumL78 on November 26, 2009, 03:44:38 PM

3/8 is the correct wrench size and the bolt is 5/16

Title: Re: Fan Shroud Bolt
Post by: JohnZ on November 26, 2009, 05:54:35 PM

Here's the original fan shroud bolt.

Title: Re: Fan Shroud Bolt
Post by: 68Zproject on November 26, 2009, 07:59:50 PM

Quote from: Jerry@CHP 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

What about 68?

Title: Re: Fan Shroud Bolt
Post by: GaryL on November 26, 2009, 09:15:40 PM

Quote from: JohnZ on November 26, 2009, 05:54:35 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.

Title: Re: Fan Shroud Bolt
Post by: Jerry@CHP 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

Title: Re: Fan Shroud Bolt
Post by: Marty 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

Title: Re: Fan Shroud Bolt
Post by: BlackoutSteve 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.

Title: Re: Fan Shroud Bolt
Post by: JohnZ 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.

Title: Re: Fan Shroud Bolt
Post by: sixt9x33rs on December 01, 2009, 12:15:41 AM

Quote from: JohnZ on November 26, 2009, 05:54:35 PM

Here's the original fan shroud bolt.

John what headmarking does that bolt have?

Thanks,

Title: Re: Fan Shroud Bolt
Post by: GaryL on December 01, 2009, 02:37:29 AM

Quote from: BlackoutSteve 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.

THe AIM indicates a # 120386 flat washer along with the #9419380 screw.