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TR7 BFH#55 - Rip in Carb diaphram

To: Triumphs@autox.team.net, british-cars@autox.team.net, tr8@mercury.lcs.mit.edu
Subject: TR7 BFH#55 - Rip in Carb diaphram
From: Eganb@aol.com
Date: Sat, 17 Feb 2001 13:44:45 EST
Well, typical story of trying to fix one thing, something else goes bad...  
And please excuse my not knowing the right terms for the parts I'm about to 
discuss.

I just got the little allen-wrench tool for adjusting the mixture on 
Zenith-Stromberg 175 carbs, so I can try to pass the emission test.  I tried 
it on the front carb, and the allen screw you turn inside the tube where you 
put the carb oil was quite sluggish, but it would turn.  

Then I tried the back carb, and the allen screw wouldn't budge at all.  So I 
take off the top of the carb and the damper, and of course the inside of the 
tube is really dirty, full of sludge at the bottom, etc.  

I try cleaning it out with gummout and PB Blaster, but the allen screw still 
won't budge, and I don't want to strip it.    

Next I figure the center tube probably unscrews from the "piston" it sits on, 
and maybe I can get at the allen screw that way, but the tube also doesn't 
want to budge, and I don't want to scratch or bend it, otherwise it won't 
"float" correctly.  And yeah, I remembered to take out the the little set 
screw on the side of the piston.  

So, I figure I'll call it a day.  I clean everyting, but as I'm reassembling 
the front carb I notice a 1/4" slit in the diaphragm.  I figure it was there 
before, but maybe not.  Anyway, with everything reassembled, the car now runs 
very poorly at idle -- 

Now I figure the slit in the diaphragm wasn't there, or was just about to 
appear.  I'll order two new diapraghms today, but would poor idling possibly 
be caused by the slit?  And by poor idling I mean it now idles at about 500 
RPM, down from 1000 RPM. 
Interestingly, the engine runs fine above idle.

And any advice on getting the allen screw unstuck on the back carb?  I guess 
I can just soak it in PB Blaster overnight.

Bruce
1980 Inca Yellow TR7 5-speed convertible
Chapel Hill, NC

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