I'm changing out the secondary carb diaphragm. Sor has one for $45, napa $14, and all kinds of prices in-between those. Has anyone replaced the rubber in the old diaphragm? That couldn't be more that five cents worth of rubber.
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Great photos!
I know there are rebuilders who repair rather than replace the assemblies. But they usually are working on obsolete stuff. $14 from Napa seems like a great value. While it's still available that seems like a fair exchange. To me.
Rick
$14 is cheap.
Amusing repairs:
Seen some diaphragms that were skinned w/ a layer of RTV snot.
Seen some Holley diaphragms w/ Aisan link brazed on to the chopped holley link.
Yes, they are usually bad after ~20 years.:whoops:$21.74 for part/tax/shipping.. Only problem with the Napa part is; the guy at the store said no stores have the part and it is ordered from the "factory". That either means I'm not going to get it or it will take awhile.
are most of the diaphragms you see in rebuilds old, torn, and cracked? The one in the above pics sounds like a piece of paper its so dried out.
Yes, they are usually bad after ~20 years.
I've got the diaphragm in stock for about NAPA price. Email me for info.
Marc, the secondary diaphragm has vacuum applied to one side of it by passages in the carb. The vacuum overcomes a closer spring and actually pulls open the second barrel on the carb.
When the rubber is cracked and leaky, vacuum cannot build up behind it, so the secondary never opens.
Sadly, this $14 failure has probably lead to several V8 swaps. (nothing wrong w/ a V8, just an extreme solution for a $14 problem).
how hard is it to rebuild a carb - there is a guy wrecking a 60 and i was thinking of buying his old carb and rebuilding it - im no mechanic - but i like playing around with fiddly s*** and thought i could rebuild his and when finished swap it for my old had it carb - and worst comes to worst - if i cant put it back together - just hand it over to competent authority
thoughts?
Marc, the secondary diaphragm has vacuum applied to one side of it by passages in the carb. The vacuum overcomes a closer spring and actually pulls open the second barrel on the carb.
When the rubber is cracked and leaky, vacuum cannot build up behind it, so the secondary never opens.
Sadly, this $14 failure has probably lead to several V8 swaps. (nothing wrong w/ a V8, just an extreme solution for a $14 problem).
how hard is it to rebuild a carb - there is a guy wrecking a 60 and i was thinking of buying his old carb and rebuilding it - im no mechanic - but i like playing around with fiddly s*** and thought i could rebuild his and when finished swap it for my old had it carb - and worst comes to worst - if i cant put it back together - just hand it over to competent authority
thoughts?
No, not in the least. The entire sec.diaphragm assembly could be left off the carb and it would start & idle fine.Could/Would this cause rough idle?