044 - 044-1 diaphragms

[rdgrimes]

How does one separate the diaphragm from the magnet? And having done so, how does one correctly replace it?

[rdgrimes]

Also, on the grill, does anyone know the correct sizing for the o-ring? It looks like 1/16" x 2-7/8 ID.

[BMWCCA]

Also, on the grill, does anyone know the correct sizing for the o-ring? It looks like 1/16" x 2-7/8 ID.

I don't think it was an O-ring on the original 044s, more like a window screen spline without the splines. I think it came as a single length with open ends. The 035 screen locks are O-rings but none of the 044s I've seen are. Of course the hard part is the color. The JBL parts I have for the 035s are black but are the same length (diameter 3") as the 044 gray "strings". The black 035 O-rings measure about 2mm diameter and the 044 gray strings seem to be a bit thicker, closer to an 1/8". Diameter of the 044 and 035 screens are both about 3" and the gasket doesn't have to stretch, just to force into the groove. The JBL part number for the 035 ring is 62664, if that helps. I haven't tried swapping them but I could if it would help. I've got plenty of spare 044s out of cabinets, and a bag new of 035 O-rings.

What I can't seem to lay my hands on is my tiny caliper. I believe I took it over to a neighbors to measure the seals in his clutch master cylinder on an antique BMW.

[JeffW]

Whatever rubber parts were on the mesh of my 044(ti) disintegrated, but the magnet is strong enough to hold them in place with no rubber parts. I stick stick them in the groove and they stay put.

[rdgrimes]

Whatever rubber parts were on the mesh of my 044(ti) disintegrated, but the magnet is strong enough to hold them in place with no rubber parts. I stick stick them in the groove and they stay put.

Also a perfectly good approach. The stuff that came out of this one (in small bits) was black, 1/16" in diameter (0.070) and the groove is 2-7/8" (2.864) inner diameter. There are o-rings available with those dimensions in a variety of materials. But any 1/16" o-ring could be cut and used as long as it was long enough.

So how does one separate the diaphragm? I want to push out some small dents but the thing won't come off the magnet.

[grumpy]

... assuming you've disassembled the tweeter to the point where there's
a fiber-board carrying the dome (and coil), and leads in view... this has
to be separated from the magnet assembly to see the back side of the
dome (I'm assuming this is the same view as a silver 044). Frankly, I
wouldn't recommend trying this as it can be difficult if the adhesive
is well ... adhered. Others here have tried this and have found it to be
less of an issue. There should be a foam cylinder behind the dome,
likely glued to the magnet assembly, which should be put back in place
(or left alone if still glued).

Good luck, if you decide to forge on.

[rdgrimes]

I don't think it was an O-ring on the original 044s, more like a window screen spline without the splines. I think it came as a single length with open ends. The 035 screen locks are O-rings but none of the 044s I've seen are. Of course the hard part is the color. The JBL parts I have for the 035s are black but are the same length (diameter 3") as the 044 gray "strings". The black 035 O-rings measure about 2mm diameter and the 044 gray strings seem to be a bit thicker, closer to an 1/8". Diameter of the 044 and 035 screens are both about 3" and the gasket doesn't have to stretch, just to force into the groove. The JBL part number for the 035 ring is 62664, if that helps. I haven't tried swapping them but I could if it would help. I've got plenty of spare 044s out of cabinets, and a bag new of 035 O-rings.

What I can't seem to lay my hands on is my tiny caliper. I believe I took it over to a neighbors to measure the seals in his clutch master cylinder on an antique BMW.

I got the last 4 of these that JBL-Pro had in stock. He said there were another 900 or so in the warehouse. I'm getting them for free.

[BMWCCA]

I got the last 4 of these that JBL-Pro had in stock. He said there were another 900 or so in the warehouse. I'm getting them for free.

What? They give you guys a west-coast discount? Damn! And to think I had to pay 36¢-each for them! I hope they charge you shipping.






Or did you mean you bought the last four clutch cylinder seals for a fifty-year-old BMW from JBL Pro??:dont-know

[rdgrimes]

What? They give you guys a west-coast discount? Damn! And to think I had to pay 36¢-each for them! I hope they charge you shipping.

Got them today, they shipped FedEx and charged me not a cent.

These are plain old neoprene O-rings, size 040, as far as I can see.