|Rambler American Restoration
Back to American Restoration Index
Part 3 - New Foam Kit
May 9, 2008
When I first started down the path of rebuilding my heater box, the plan was
to replace the foam with stuff from the home center but I wasn't too happy
with their selection so I ended up doing some research that turned up
nothing useful to me. About a month ago, I ended up looking on eBay for the
next part I "need" and I noticed a bunch of AMC gaskets marked "DMT". As it
turns out, "DMT" means
Detroit Muscle Technologies which is a company that makes these types of
parts for a lot of Chrysler cars and is looking to get into AMC (they do
have some Javelin and AMX stuff already). They were eager to make my gaskets
for me so I took a lot of measurements, did some drawings, consulted a
mechanical engineer about them (seriously, thanks dad!), and sent everything
Last night (May 8th), the gaskets were waiting for me. The picture below
shows most of what arrived. There is one part I'm not showing on purpose
now, but I will add a picture of it when I get the final version. Also, keep
in mind that this is the first take based on some pretty ratty (or
non-existent) samples so a few things will end up tweaked a little in final
Here is what the parts are:
- Defroster duct extension to defrost duct seal.
- Blower motor mounting stud grommets (the hole in the middle
is a hair small in this set).
- Heat/defrost blend door insulation.
- Heat/defrost blend door bumper.
- Air door bumper.
- Air door insulation.
- Heater core end gaskets (this part isn't thick enough and is
being changed to the proper thickness).
- Heater core tube seal.
- Heat core front gasket.
Part H is for 67 and older cars with two 5/8" heater core nipples. A
suitable (albeit incorrectly shaped) seal for 68 and up cars is available
from most AMC suppliers.
The finalized kits will have three additional gaskets in them. There is a
gasket that goes between the blower motor and it's mounting plate (this is
currently available from other vendors but off slightly), a gasket that goes
between motor mounting plate and heater box (the one currently available is
the wrong shape for Americans and made of the wrong material), and the
heater box to cowl seal.
The cool part about this is that most of the parts fit first generation
Javelin and AMX models. Parts A and B are American specific for sure, C-F
are a maybe - the part book doesn't list these since the heater box would
have been replaced as an assembly, and some of them even fit all models of
that era (G -- as noted above, H, I, and the blower motor to mounting plate
DMT is also doing a correct wiper motor mounting gasket (the one currently
available is too thick and missing some details) and a few other parts. More
on those as they are available.
Update: May 29, 2008
The last of the parts I was waiting on showed up today. The large
rectangular part is the heater core to cowl gasket, the small round part is
the blower motor to heater plate gasket (more on that below), the tear drop
shaped part is for the blower motor plate to heater box (this needs trimmed
so its round), and the small rectangular parts are the heater core end
Here is one of the parts that DMT improved over the previously available
part (blower motor to mounting plate gasket). The part on the left is the
DMT part and the one on the right is made by REM. Both parts will fit and
work but notice the different in the holes? The reason the DMT part has four
holes is that the same gasket was used for both A/C and non-A/C cars and
each motor has different mounting stud spacing. The DMT has the holes cut so
they fit both patterns perfectly. The REM part doesn't fit either one
properly. The DMT part also crushes better which will allow for a better
Up next: Installing Air Door Foam
05/29/08 08:49:41 PM