65 seat bolts (E) Headmark

[Jim R.]

the mounting bolts that bolt the seat to the floor , were they all the same (E) headmark with the pointed end's or were the front ones flat at the end of the threads. the assbly manual shows two different part #s for the front and rear bolts.

[Rich P.]

Re: 65 seat bolts (E) Headmark

Jim,

No easy answer here. I can give you some insight as to what I have seen. all 63-66 seat mounts had the same set-up, 4 bolts in the front and 8 bolts in the rear.

Many cars had the same bolt for all 12 positions.

Some cars the difference was the front 4 bolts had a serrated washer while the rears didn't. Other cars had a longer rear bolt (that is the possible explanation for a different part # for the 2 spots)

For all of the above the bolts all had a flat tip.

Some (very few) had pointed tips on the 4 front bolts.

Some headmarkings are GL, B&H, SEMS, Anchor, Flying F among others.

Keep in mind these are just my observations on 63-66's that I have worked on.

Hope this helps, Rich

[Steven S.]

Re: 65 seat bolts (E) Headmark

The rear bolts on a '66 that I have recently worked on in which I strongly believe was never tampered with in this area were the "E" headmark, pointed tip, 1" long, non-serrated washer. The bolts in front were "B&H", flat tip, 3/4 long, non-serrated washer, although the front bolts on this car were out once before.

Steve

[Rich P.]

Re: 65 seat bolts (E) Headmark

Steve,

I'm sure your rear bolts are correct. If you check out the AIM UPC 1 SEATS sheet J4 for the rear bolt pt# it is 3847758.
Then turn to UPC 11-13 sheet A-3 number 4 is the small splash shield to fender skirt bolt bolt pt# 3847758. Which is excactly as you described, 1" long with a pointed tip. Now for this application I have hardly ever seen another bolt used. But for the rear seat bolt in my experiance it is the oppisite I have only seen pointed tip bolts a few times and flat tip bolts were used 80-90% of the time. I would be curious to hear from others who have observed original untouched cars on this.

Rich

[Lynn H.]

Re: 65 seat bolts (E) Headmark

I recently had the seats out of an unmolested late 65 (20007), and the mounting bolts were fo the flat tipped variety. This is in contrast to what I have seen in most later applications which had the pointed tip. Most likely another case of "all cars not being identical' when it comes to types or manufacturers of fasteners.

[Steven S.]

Re: 65 seat bolts (E) Headmark

Steve,

I'm sure your rear bolts are correct. If you check out the AIM UPC 1 SEATS sheet J4 for the rear bolt pt# it is 3847758.
Then turn to UPC 11-13 sheet A-3 number 4 is the small splash shield to fender skirt bolt bolt pt# 3847758. Which is excactly as you described, 1" long with a pointed tip. Now for this application I have hardly ever seen another bolt used. But for the rear seat bolt in my experiance it is the oppisite I have only seen pointed tip bolts a few times and flat tip bolts were used 80-90% of the time. I would be curious to hear from others who have observed original untouched cars on this.

Rich

Rich, you refer to rear bolts twice, could you clarify? I assume that you are referencing the '65 AIM (which is appropriate since the original question applies to a '65), the '66 AIM has the seat bolts illustrated on sheet J5, which is curious because it lists both the front and rear seat bolts as #3847757, there is a note in the revisions about "3847758 SCREW REMOVED" but the date is not legible on my copy. I see the 7758's called out in several other applications like the splash shields as you mentioned, but for some reason something was changed for the seat bolts, and either this '66 was put together before that revision or the line guy didn't get that memo

Interesting stuff, trivial, but interesting.

Steve

[Rich P.]

Re: 65 seat bolts (E) Headmark

Rich, you refer to rear bolts twice, could you clarify? I assume that you are referencing the '65 AIM (which is appropriate since the original question applies to a '65), the '66 AIM has the seat bolts illustrated on sheet J5, which is curious because it lists both the front and rear seat bolts as #3847757, there is a note in the revisions about "3847758 SCREW REMOVED" but the date is not legible on my copy. I see the 7758's called out in several other applications like the splash shields as you mentioned, but for some reason something was changed for the seat bolts, and either this '66 was put together before that revision or the line guy didn't get that memo

Interesting stuff, trivial, but interesting.

Steve

Steve, sorry for the confusion....

First yes I am using the 65 AIM.

Second my second refrence to Pt # 3847758 on sheet 11-13 was for the small splash shield bolt. I did this because I know for sure that these were 1" pointed end bolts.

Now you refrence the pt # 3847757 that is the shorter flat end bolt. I don't have a 66 manual handy does it say all 12 bolts are to use bolt # 3847757, because this is the most common use of bolts that I have seen (all the same length with a flat tip).

Rich

[Steven S.]

Re: 65 seat bolts (E) Headmark

Rich,
Yes, all 12 seat bolts in the '66 AIM are of the # 3847757 variety. Makes you wonder what propted a change from the # 3847758 bolt.

Isn't this fun!

Steve

[Jim R.]

Re: 65 seat bolts (E) Headmark

Ok for a while i thought mine were wrong now i'm confused, because i'm sure that i put the seat bolts back in the same way they came out, when i took it apart the interior was a worn original. ser # 22192 late 65 mid july car ,mine has 8 pointed in the rear and 4 flat in the front, i think i am going to stick with what i have.......this is fun!

[Steven S.]

Re: 65 seat bolts (E) Headmark

Ok for a while i thought mine were wrong now i'm confused, because i'm sure that i put the seat bolts back in the same way they came out, when i took it apart the interior was a worn original. ser # 22192 late 65 mid july car ,mine has 8 pointed in the rear and 4 flat in the front, i think i am going to stick with what i have.......this is fun!

Jim, that is what I have in this '66 as well, the pointed rear bolts I am sure were in since new, but I can't say that for sure of the front "flat" bolts. It would seem then that neither of our cars have exactly what the AIM is prescribing.

Steve

[Alan D.]

Re: 65 seat bolts (E) Headmark

OK let's make things worst for a while or at least until somebody looks up the pn in Grp 8.900 which I do not have.

Screw 3847757 was replaced on 3-11-64 with screw 3847758 which I understand from the above post was again used in 1966 (the 757 screw). In 64 all screws for the seats are the same.

The 64 AIM shows the 3847758 used for the small splash shield, the support rod under driver's area in one spot only (1 Assembly Sheet B1.00), and for the hindge to the back Lid Assembly (1 Assembly C 6.00)
Someone may want to look at later AIM's for these used in same locations.

Do a search for the 387758 screw, I've asked before for other locations, they are pointed.

[Rich P.]

Re: 65 seat bolts (E) Headmark

Alan,

every application you mentioned for pt #387758 are all the 1" pointed tip. The under dash application is the rod that bolts to the wiper recess area, it gets an extra flat washer under the rod for support (most likely the reason for the 1" bolt). I don't have time to check the AIM but this bolt was also used to mount the door hinges to the front door jamb (Not in the hinge pillar but onto the fiberglass in the jamb).

Rich

[Alan D.]

Re: 65 seat bolts (E) Headmark

Rich,
Screw 3847757 had a serrated flat washer while the later 3847758 was the same, but NO serrated flat washer. Bet GM had a slipping problem with the later bolt (758) so went back to (757) serrated. (But who knows?)

Also see Section 11-13 Sheet B7.00 / Think LI has these

[John L.]

Re: 65 seat bolts (E) Headmark

JIM:
My A.O. Smith April built 65 has the 4 front bolts with 3/4" of thread and with a flat end, captive washer, with a GL head mark. The eight bolts for the rear seat brackets are similar, have an RBW mark, and pointed ends. The A.O. Smith body's seats were reportedly removed at St Louis and reinstalled later.

[Jim R.]

Re: 65 seat bolts (E) Headmark

Thanks john i will look and see what headmarks mine have, mine also is a ao smith car 22192