103328 Lock Washer

[Timothy B.]

In my 67 AIM there is reference to a 103328 l/washer attaching the strut bracket. I have read the washer is 7/16 ID so is this a typo, the AIM page is section 4 page B2.

The bolts that attach the strut bracket are 3/8" grade eight so something is not correct here.

Thanks for any info..

[Joe L.]

Re: 103328 Lock Washer

In my 67 AIM there is reference to a 103328 l/washer attaching the strut bracket. I have read the washer is 7/16 ID so is this a typo, the AIM page is section 4 page B2.

The bolts that attach the strut bracket are 3/8" grade eight so something is not correct here.

Thanks for any info..

Tim------


I believe it is an error and it was corrected for 1968. Although 1968 did use a different strut rod bracket than 1963-67, the attachment was identical.

[Scott S.]

Re: 103328 Lock Washer

In my 67 AIM there is reference to a 103328 l/washer attaching the strut bracket. I have read the washer is 7/16 ID so is this a typo, the AIM page is section 4 page B2.

The bolts that attach the strut bracket are 3/8" grade eight so something is not correct here.

Thanks for any info..

Tim,

My notes show that this is an AIM error, I'm almost certain the information came from John Hinckley. In my AIM (UPC 4-B2), I have item 14 (GM 103328 L. Washer) crossed out, and replaced with item 8 (GM 103321 L. Washer).

After reading Joe's post, I checked the '68 AIM, and as he says, it calls out GM 103321 L. Washer at the location where the '67 AIM calls out item 14. I believe the correct sequence should be:

GM 454905 bolt, to
GM 103321 L. Washer, to
GM 120394 P. Washer, to
Strut Rod Bracket.

[Timothy B.]

Re: 103328 Lock Washer

Thanks Scott and Joe for the information, I will correct my book as well.

[Wayne M.]

Re: 103328 Lock Washer

.... I believe the correct sequence should be:

GM 454905 bolt, to
GM 103321 L. Washer, to
GM 120394 P. Washer, to
Strut Rod Bracket.

And that's exactly the way it is in the '65 AIM UPC4, Sheet B2 (ie. with the 103321 lock washer).

[Joe L.]

Re: 103328 Lock Washer

All------


This is actually a very interesting sort of error in the AIM. It's not just a case of a part number being shown incorrectly. It's a case in which a new numbered item was added to the AIM sheet. In this case, it was a 7/16" lock washer for a system also using a 3/8" flat washer and 3/8" bolt. And, it was applicable to only one of the 4 bolt positions. It might provide some insight into the process by which these AIM drawings were created and modified but, if so, I have not "deciphered" it.

[John H.]

Re: 103328 Lock Washer

All------


This is actually a very interesting sort of error in the AIM. It's not just a case of a part number being shown incorrectly. It's a case in which a new numbered item was added to the AIM sheet. In this case, it was a 7/16" lock washer for a system also using a 3/8" flat washer and 3/8" bolt. And, it was applicable to only one of the 4 bolt positions. It might provide some insight into the process by which these AIM drawings were created and modified but, if so, I have not "deciphered" it.

Joe -

My wife was a technical illustrator and graphic line artist at GM for many years, and drew hundreds of AIM sheets (it was all done manually in those days, on "D"-size vellum, by the Engineering Graphics group in the Drafting Room organization). The process started with what was called a "General Arrangement Layout", which was a full-size drawing of the car that showed how a given system fit and was packaged in the space and background allotted, drawn by a Designer/Draftsman in the Drafting Room. The next source was another Design Layout, also full-size, only of the system itself. The Illustrator used those Layouts, plus the detail drawings for each of the parts in the system, plus their own sketches and photographs of the installation on Design Check bucks in the Design Check Room, to manually create the isometric perspective illlustrations, which were signed-off by the Release Engineer responsible for the parts when the sheet was complete, for the initial release.

Revisions were made based on information included in approved ECR's (Engineering Change Recommendations) initiated by the Release Engineer and provided to Engineering Releasing, the Drafting Room, and to the Engineering Graphics group. You'll see those ECR numbers referenced in the revision block for each change, and you'll see the Layout numbers referenced on the left side of the title block where the initial release dates for the sheet are shown.

The actual implementation of changes on the line were handled through the NPC (Notice of Production Change) system, which was a completely different organization that coordinated Engineering, Purchasing, Material & Production Control, Production Planning, Manufacturing and Assembly; the date shown in the revision block for any change is simply the date when Engineering Graphics revised the AIM sheet.

Creating and producing the AIM (every car line had one, with its own part number) was an enormous undertaking involving literally hundreds of people in the Engineering Graphics organization, and every lick of work was done manually, using pencils, pens, and cut-and-paste methods through the mid-80's.

[Timothy B.]

Re: 103328 Lock Washer

John,

Given how you described this process and when looking at the detail in these AIM's they did a pretty darn good job.