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?
Throw that bolt in the rubbish.
3/8" indented head with built in flat washer for '69. Every '69 you see has the incorrect bolt in it!
Jerry
Quote from: Jerry@CHP on November 25, 2009, 09:20:01 PM
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?
Do 69 BB and SB the same bolt? 9419380..
AIM only shows "V8 engine". Nothing in L35.
Any pictures of an original? ..Please.. :-* ;D
The bolt size would be 3/8 not the head or wrench size.
3/8 is the correct wrench size and the bolt is 5/16
Here's the original fan shroud bolt.
Quote from: Jerry@CHP on November 25, 2009, 09:20:01 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?
Quote from: JohnZ on November 26, 2009, 12:54:35 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.
'67 and '68 use a 1/2" indented head (wrench size), bolt is actually 5/16 x 18,
Jerry
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
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 '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.
Quote from: JohnZ on November 26, 2009, 12:54:35 PM
Here's the original fan shroud bolt.
John what headmarking does that bolt have?
Thanks,
Quote from: BlackoutSteve on November 29, 2009, 03:44:05 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.