C2 Heater box gaskets

[Donald H.]

I just finished restoring my heater box. I'm trying to make sure to locate the gaskets correctly when I but it back together.

In the attached picture there are three gaskets (from the Dr. Rebuilt kit). I think I have them in the correct order per the AIM UPC 1 ASM sheet D6. I believe the gray gasket is listed in the AIM as item 2 INSULATOR and it goes between the inner heater box and the heater core/bracket.

Can someone confirm this?

Thanks,

Don

[Donald H.]

Re: C2 Heater box gaskets

By the way, I found the attached pictured lighter rattling around inside the inner heater box. Looks like something that would have been there since the late 60s or early 70s, and it still strikes a spark!!

Don

[Edward J.]

Re: C2 Heater box gaskets

Don, It looks like you have everything correct as far as the gaskets go. Lighter is a neat item. good keep sake.

[Patrick B.]

Re: C2 Heater box gaskets

The illustration on the DR. Rebuild web site is confusing since it shows both the grey gasket and the black gasket on the outside of the heater core mounting plate rather than the more logical way you have them. Don, I will keep in touch with you about how your's fit before I re-install my heater at Zane Finney's shop.

[Donald H.]

Re: C2 Heater box gaskets

Thanks all

[Donald H.]

Re: C2 Heater box gaskets

The illustration on the DR. Rebuild web site is confusing since it shows both the grey gasket and the black gasket on the outside of the heater core mounting plate rather than the more logical way you have them. Don, I will keep in touch with you about how your's fit before I re-install my heater at Zane Finney's shop.

Sounds good Pat. By the way, I used your technique to test the new heater core.

Don

[Richard M.]

Re: C2 Heater box gaskets

Don/Pat, This has always been confusing to me also, but here is my thought on this mystery foam seal....

The AIM is a bit confusing but I'm not sure that yours is correct. I looked at the DR diagram and it doesn't match the AIM.

Below is a AIM copy with notes that Zip uses. There it shows the profile of the light foam seal. You can see the profile at the top right and bottom right in the picture. The AIM also specifies a adhesive(55A 1.5 oz) to attach it to the housing, which appears to be on the backside. That's a substantial amount of glue so I think the foam gets glued on the backside around the perimeter of the housing before installation.

Also, the heater box came as a assembly. The foam seal, Item 2 "INSULATOR"(light foam), and Item 5 "SEAL"(dense foam) are shown as separate parts. IMO, if the INSULATOR was put on over the 4 studs first I think it would not need adhesive either.
63-67c25_p114-j_1_3.gif

I used the Zip Products ZWS-478 kit just the other day on a '67 heater box rebuild. Some pics in this post.

Note the foam seal is carved to fit over the edge of the housing and I believe it is positioned on the backside of the box after installation to the firewall. This profile matches the AIM more accurately. I don't think that light foam seal should have holes in it for the studs to pass through. This is also shown in the AIM.

Also, if the core frame was placed over the foam as you show in your diagram, the inner side would have a large gap where it meets.

zws-478.jpg

Unless there's a error in the AIM, or I've missed something obvious, this is how I feel it's assembled.

Rich
p.s. I also found a lighter in my '59 when I bought it 29 years ago. But it was tucked in the hole under the sill step. That along with a few other trinkets.
PB170007.jpgPB170008.jpgPB170009.jpgPB170010.jpg

[Patrick B.]

Re: C2 Heater box gaskets

Richard/Don

I don't have my Paragon heater gasket kit at home but I will check it out later this week at my shop. I think it is carved out like Richard's without any stud holes. The AIM picture was confusing to me, but Richard's explanation makes sense. Don, I think the way your picture shows the gaskets, the gray seal will prevent the heater core mounting plate from fitting inside the heater housing correctly.

[Timothy B.]

Re: C2 Heater box gaskets

Richard,

I agree with your assessment of this foam seal. On my 63 I installed it as you describe, maybe others that have done this can respond.

[Donald H.]

Re: C2 Heater box gaskets

OK, I see how it goes now. Hard to understand from the AIM. So the core is mounted to the inside box, then the box to the fan unit through the firewall. the gray foam insulator seals the inner heater box flange to the firewall. Now that makes sense!!!!

Zip sells the gray foam insulator as a individual piece, so I just ordered one.

By the way, this all begs another question. On reassembly can the inner heater box be installed before the jute firewall insulation and the firewall mat? What is the best order of assembly?

Thanks,

Don

[Bill W.]

Re: C2 Heater box gaskets

Rich & don I dont want to hijack your thread but I found two Hypo .needles and syringes in my windshield washer bottle on my 62 and lots of sockets in the trunk body mount holes (and they had the covers on them ).

[Richard M.]

Re: C2 Heater box gaskets

Don, I always install the ceiling insulation, then the pedal support, then the firewall insulation, then the heater box lastly. However, if the wiper motor is out better to install that before the heater but it can go in later.

I did this colorized diagram early this morning depicting the way I think the seals were intended from the AIM, but it's hard to read. If you download it you may be able to mag it. I'll play with it tonight or tomorrow to make it bigger.

Rich
C2HeaterSealsColorized.jpg

[Donald H.]

Re: C2 Heater box gaskets

Rich & don I dont want to hijack your thread but I found two Hypo .needles and syringes in my windshield washer bottle on my 62 and lots of sockets in the trunk body mount holes (and they had the covers on them ).

I hope you carefully disposed of the hype needles and syringes!!!

Don

[Donald H.]

Re: C2 Heater box gaskets

Don, I always install the ceiling insulation, then the pedal support, then the firewall insulation, then the heater box lastly. However, if the wiper motor is out better to install that before the heater but it can go in later.

I did this colorized diagram early this morning depicting the way I think the seals were intended from the AIM, but it's hard to read. If you download it you may be able to mag it. I'll play with it tonight or tomorrow to make it bigger.

Rich
[ATTACH=CONFIG]62492[/ATTACH]

Your enhancement makes it much easier to see.

Thanks,

Don

[Hank D.]

Re: C2 Heater box gaskets

Don/Pat, This has always been confusing to me also, but here is my thought on this mystery foam seal....

The AIM is a bit confusing but I'm not sure that yours is correct. I looked at the DR diagram and it doesn't match the AIM.

Below is a AIM copy with notes that Zip uses. There it shows the profile of the light foam seal. You can see the profile at the top right and bottom right in the picture. The AIM also specifies a adhesive(55A 1.5 oz) to attach it to the housing, which appears to be on the backside. That's a substantial amount of glue so I think the foam gets glued on the backside around the perimeter of the housing before installation.

Also, the heater box came as a assembly. The foam seal, Item 2 "INSULATOR"(light foam), and Item 5 "SEAL"(dense foam) are shown as separate parts. IMO, if the INSULATOR was put on over the 4 studs first I think it would not need adhesive either.
[ATTACH=CONFIG]62485[/ATTACH]

I used the Zip Products ZWS-478 kit just the other day on a '67 heater box rebuild. Some pics in this post.

Note the foam seal is carved to fit over the edge of the housing and I believe it is positioned on the backside of the box after installation to the firewall. This profile matches the AIM more accurately. I don't think that light foam seal should have holes in it for the studs to pass through. This is also shown in the AIM.

Also, if the core frame was placed over the foam as you show in your diagram, the inner side would have a large gap where it meets.

[ATTACH=CONFIG]62484[/ATTACH]

Unless there's a error in the AIM, or I've missed something obvious, this is how I feel it's assembled.

Rich
p.s. I also found a lighter in my '59 when I bought it 29 years ago. But it was tucked in the hole under the sill step. That along with a few other trinkets.
[ATTACH=CONFIG]62486[/ATTACH][ATTACH=CONFIG]62487[/ATTACH][ATTACH=CONFIG]62488[/ATTACH][ATTACH=CONFIG]62489[/ATTACH]

I agree with the explanation Richard provides in Post #7 above for the following reasons:


1. The AIM diagram does appear to show the "insulator" behind the firewall, and on top of the heater box.
2. if this were a "gasket", it seems it would be made to form a complete seal instead of made C-shaped.
3. GM would not call out cement if it were not needed, and it appears it would not be needed
if this were a "gasket", installed between the heater box and the firewall.
4. The AIM says use "1.5 oz per job (of cement), insulator to heater" in 3A, Section 1, Sheet B 5.00, not insulator to firewall.


Then again, I could be wrong.