Crab 42-48 vacuum seal
 

Deal of the day !!! Someone had a post the other day regarding the vacuum seal on the 42-48 crab distributor.
I didnt have the time to look but knew we had some somewhere and i found them.!!
Getting the old seal out is the biggest problem, you can leave the old rivit in if ya want or take it out when you remove the seal..
I will send you two new seals at no charge if you will send me a self addressed envelope with postage on it :eek: Thats as good as it gets .

Need more send more envelopes ?????? My friday special just for the barners !!!! :D

Re: Crab 42-48 vacuum seal
 

Bubba comes through again!

Re: Crab 42-48 vacuum seal
 

I guess they will all be gone by the time my SSAE gets there from OZ.

Re: Crab 42-48 vacuum seal
 

I see you have an rubber "O" ring under the vacuum piston cap. Are you sending them out that way?

Re: Crab 42-48 vacuum seal
 

Actually thats a gasket. And yes we are using this gasket on all rebuilds today.

Over the years we have used different seals here from paper to small orings.

Interesting that over the years building hundreds of these crab distributors ( or any distributor ) we see things, talk to customers and make service changes as we go based on needs etc. Fit and finish , types of lube to assemble, brands of parts, paint, stainless screws , caps clips , leather for vac brakes etc.....I actually believe we finally have got the clearances correct as well....
Heres 5 i did yesterday , note the point plate is painted with a special "transtar" primer as well.
And i still learn something every time i build them:eek::)

Re: Crab 42-48 vacuum seal
 

I really like the crab distributor. You can see Henry's men were briefed to make it as short as possible. To actually get a change adopted that meant shortening the cam would have been a big thing. Shoving the main bush for the distributor shaft back inside the engine was the major step in getting a shorter overall length package.

I think it's a masterpiece of design.

Mart.

Re: Crab 42-48 vacuum seal
 

Agreed, cream of the crop!!!!!!!:eek::eek:

Re: Crab 42-48 vacuum seal
 

Bubba why were some alloy and others steel for the crab? Seem to be more steel ones down here in NZ. I have both. I got the ali one from a part supplier in the US way back

GB

Re: Crab 42-48 vacuum seal
 

I've heard the military ones were iron.

Re: Crab 42-48 vacuum seal
 

What and where is the rivet that we can leave or discard?

Re: Crab 42-48 vacuum seal
 

The "rivet" is in the center of the vacuum seal, it retains the seal. If you look at Bubba's post #1 above the second and third photo show the brass rivet, the best.

Re: Crab 42-48 vacuum seal
 

Never really found a answer for that , when we did the crab trade program a few years back in a effort to find cores. I traded a few hundred units and 2 out of 100 were cast. We cleaned them up and painted them black and kinda like the look. I now have a few here and there , there is some variation on the castings as well.....

Would like to hear the real answer i guess.....:eek:

Re: Crab 42-48 vacuum seal
 

I will check when I get home if our steel crabs over here have that.

Re: Crab 42-48 vacuum seal
 

Mine used to whistle a hi pitched tune. Then I greased the leather and tightened it up. As of 4 days ago it now hisses. The reason I know is because I have a soft line (silicone) at the intake going to the steel tube to dizzy, and if I remove it the silicone tube, It's quiet as a mouse. Something downstream of the intake is hissing pretty bad.

Re: Crab 42-48 vacuum seal
 

I can't see a reason for a 0 ring there. The gasket does fine. No 0 rings on a carb base
just a gasket right, and there is more vac. going on at the carb than that skinny little
vac dist. line.

Re: Crab 42-48 vacuum seal
 

Jim:

Is this deal still active?

Thanks again for all you do!

Tim

Re: Crab 42-48 vacuum seal
 

Need more send more envelopes ?????? My friday special just for the barners !!!!

Bubba
That is a very nice thing that you are doing for the barners.
Jay

Re: Crab 42-48 vacuum seal
 

Yep..............wont stop for a while ....:D

Re: Crab 42-48 vacuum seal
 

Just mailed the first 6 letters with seals, let me know when ya get them....got plenty for any that wants them.....:eek::D

Re: Crab 42-48 vacuum seal
 

I had a cast iron one I sold about a year ago, it was the only one I had ever seen.