Carb insulator

[middlecalf]

Check out the wall of shame thread. There’s probably a wood one for sale.

 

[oregon fj]

Trying to avoid the wood one.

Yes, I have 2 gaskets now, they aren’t very thick but I have them in the measurements. Pretty certain that 12mm must have been the original thickness. In a metric world, I’d easily be able to source 12mm material, but here in the states 1/2” will have to do. The difference, after all, is only .020”.

I looked about a bit locally, haven’t found anyone who stocks such material. I’ll probably order a 12x12” piece, that will give me enough to make several attempts.

 

[65swb45]

I want to say the gasket is closer to 1/4” than half. I’ve meant to measure the NOS one for you, but then again I’ve been meaning to do a lot of things lately. VM rules king in my world these days.

 

[oregon fj]

1/4” isn’t close, much too thin. The remains of my original are 8mm thick, and I’m still 2-3mm short, the carb hits the inner stud long before it seats.

 

[65swb45]

Hits hits? Or just won’t let you thread the nut on? You DO have to start that nut with the carb suspended above the insulator.

Or it’s possible that you have studs from a newer PCV type intake.

 

[tls3601]

Having worked as a machinist, making one out of Delrin may be a good choice. Not sure how it would hold up to heat though. Think Mark mentioned Bakelite, may be less prone to failure from heat.

 

[oregon fj]

Hits hits? Or just won’t let you thread the nut on? You DO have to start that nut with the carb suspended above the insulator.

Or it’s possible that you have studs from a newer PCV type intake.

@65swb45 I’m well aware that you need to start the nut while the carb is suspended, same as you need to lift the carb while removing the nut. But the carb won’t sit flat on the 8mm (5/16”) remains of the existing insulator because of the stud/ carb interference. Not even close.

Here’s a picture from before I removed the carb. Nasty-looking as it is, you can see that the one I removed is clearly thicker than 6mm (1/4”). I suppose it is possible that the studs and/or manifold has been replaced with the later PCV style, but considering the overall originality under the hood and elsewhere, I think that is unlikely.

 

[oregon fj]

So after talking with several people and sharing pictures, I’ve come to the conclusion that there were at least 2 different thicknesses of these fiber insulators. Perhaps 3, but I’ve no firm evidence of a third.

One - the version which Mark has an NOS example of - is either 6mm or 1/4” thick. Pictures of this one in the wild that I’ve seen show it used in combination with a 10mm (3/8”) Bakelite spacer that has the PCV connection. It may have been also used alone, but the carb mounting studs would need to be shorter than mine are for that to work alone.

The other one was either 12mm or 1/2” thick, and always used alone. If your carb mounting studs stand 33-34mm tall and your rig does NOT have PCV, you need the thick one. That thickness still gives full thread contact. (Details - a 12mm insulator with 2 gaskets and the 10mm thick carb flange is about 24mm. The nuts are about 9mm thick, so that’s about perfect.)

Knowing for certain what I need, I ordered a 12x12” sheet of grade CE phenolic in 1/2”. While I suspect the original may have been metric sized (12mm), the 1/2” is only .020” thicker. I figured a sheet that size would allow me to try several times if necessary to get one I was happy with, but it turns out the stuff is pretty easy to work with and the first attempt is good enough.

Now that I have this, going to try to get it running later today.

 

[65swb45]

 

[oregon fj]

Carb installed with new 1/2” insulator.

 

[Allingerb]

So no more vacuum port? Or is it redirected? I'm in search of replacement currently. Smh

 

[Pighead]

Nice work.

 

[oregon fj]

So no more vacuum port? Or is it redirected? I'm in search of replacement currently. Smh

My ‘64 is pre-PCV, so there is no port in the insulator. That is part of the problem, there are multiple configurations.

If yours has a port, I’m guessing that your fiber insulator is the 6mm one, used in tandem with a Bakelite 10mm spacer that has a port in it. Like so...

 

[oregon fj]

Nice work.

Thanks. The proof is in the pudding. Shortly after I installed it all, my 40 started up and ran for the first time in at least 10 years. Feeling pretty good about today’s progress.

 

[Allingerb]

My ‘64 is pre-PCV, so there is no port in the insulator. That is part of the problem, there are multiple configurations.

If yours has a port, I’m guessing that your fiber insulator is the 6mm one, used in tandem with a Bakelite 10mm spacer that has a port in it. Like so...

View attachment 1607412

I'm going to have to look at mine when I get home. Looks to be correct though.

 

[Allingerb]

Here's a picture of mine to add to the subject. Seems thickness of previous+gaskets.

 

[oregon fj]

Here's a picture of mine to add to the subject. Seems thickness of previous+gaskets.

Would be interesting to know more about yours. You appear to have only the 10mm (3/8”) Bakelite spacer with PCV port. Also, note that you couldn’t go any thicker based on stud length. Just for my curiosity, what year is your rig? And how long are your carb mounting studs? I’m guessing your studs at ~30mm (just under 1 1/4”).

 

[Allingerb]

My motor was supposed to have come out of a 65 fj45. I can measure next time I'm off work and it's light out. Fridayish.