I'm trying to locate an EGR Valve for a 1974 BB, Part# 7041426. I checked the Car&Parts Engine numbering catalog, it wasn't listed. I would appreciate any help. Any suggestions for removing the old EGR valve which appears to be frozen in place. I've already removed the hold-down bolt and the EGR won't budge.
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Re: EGR Valve
Jim----
Are you sure that the number is not 7041425? That part number was the PRODUCTION part number for 1974 Corvettes with THM and California emissions. It continued in SERVICE until about 1978 when it was replaced by GM #17051841. Unfortunately, this part, too, was discontinued several years ago.
I can find no reference to GM #7041426 ever being a production or service part number for ANY Corvette. This part number did exist, though. It was discontinued from SERVICE sometime between 1981 and 1986.
Any of the above parts will be extremely difficult to find and VERY EXPENSIVE if you do. If you must have the original part number, I'd suggest contacting Greenhoes Corvettes or Cranes Corvettes. Otherwise, if what you're after is a functional valve, an aftermarket supplier like Standard Auto Parts or Filko might have what you need. The configuration might even be close.
As far as removing the valve goes, if you've removed the retaining bolt, you should be able to tap it off with light taps from a small hammer. Sometimes these valves get "carboned-up" and stick. Also, you may be able to salvage the valve as long as the actuating diaphragm is ok. Very often, these valves simply get "carboned up" and cease to actuate. If you remove the valve and carefully "de-carbonize" it and the manifold orifice, you might return it to functionality. The fact that you are having a hard time removing it would tend to indicate that excessive carbon has built up. If you try cleaning it, though, don't immerse it in any cleaner or solvent; that will ruin an otherwise serviceable diaphragm. Clean it carefully with a Dremel Tool and small wire wheel. When you're through cleaning it, apply vacuum to the vacuum port; a MityVac pump will work well. If the rod and valve moves, the diaphragm is ok and you should be able to use the valve.In Appreciation of John Hinckley -
Re: EGR Valve
Jim----
Are you sure that the number is not 7041425? That part number was the PRODUCTION part number for 1974 Corvettes with THM and California emissions. It continued in SERVICE until about 1978 when it was replaced by GM #17051841. Unfortunately, this part, too, was discontinued several years ago.
I can find no reference to GM #7041426 ever being a production or service part number for ANY Corvette. This part number did exist, though. It was discontinued from SERVICE sometime between 1981 and 1986.
Any of the above parts will be extremely difficult to find and VERY EXPENSIVE if you do. If you must have the original part number, I'd suggest contacting Greenhoes Corvettes or Cranes Corvettes. Otherwise, if what you're after is a functional valve, an aftermarket supplier like Standard Auto Parts or Filko might have what you need. The configuration might even be close.
As far as removing the valve goes, if you've removed the retaining bolt, you should be able to tap it off with light taps from a small hammer. Sometimes these valves get "carboned-up" and stick. Also, you may be able to salvage the valve as long as the actuating diaphragm is ok. Very often, these valves simply get "carboned up" and cease to actuate. If you remove the valve and carefully "de-carbonize" it and the manifold orifice, you might return it to functionality. The fact that you are having a hard time removing it would tend to indicate that excessive carbon has built up. If you try cleaning it, though, don't immerse it in any cleaner or solvent; that will ruin an otherwise serviceable diaphragm. Clean it carefully with a Dremel Tool and small wire wheel. When you're through cleaning it, apply vacuum to the vacuum port; a MityVac pump will work well. If the rod and valve moves, the diaphragm is ok and you should be able to use the valve.In Appreciation of John HinckleyComment
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