1985 K20 Smog Pump Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

DesertBob · 08-20-2010, 09:43 AM

Just bought a truck and I live in a Tennessee County that requires tailpipe only emissions test. My truck is a 1985 K20 with the LT9(M 350) with HD 8600 GVWR emissions. This means no Cat but it looks like it has 2 smog or air pumps. There is no belt and only the upper pump has a pulley. Both spin freely. Truck has AC and is a manual transmission.

Question. Do both pumps need pulleys and if so does anyone have a diagram or picture of this setup.

I was kind of supprised to find the lower pump. Looks like the rest of the emissions stuff is on the truck. Just have to hook up the hoses.

Thanks.

DesertBob · 08-21-2010, 10:33 AM

btt

08-20-2010, 09:43 AM	#1
DesertBob Registered User Join Date: Aug 2010 Location: Goodlettsville, TN Posts: 41	1985 K20 Smog Pump Question Just bought a truck and I live in a Tennessee County that requires tailpipe only emissions test. My truck is a 1985 K20 with the LT9(M 350) with HD 8600 GVWR emissions. This means no Cat but it looks like it has 2 smog or air pumps. There is no belt and only the upper pump has a pulley. Both spin freely. Truck has AC and is a manual transmission. Question. Do both pumps need pulleys and if so does anyone have a diagram or picture of this setup. I was kind of supprised to find the lower pump. Looks like the rest of the emissions stuff is on the truck. Just have to hook up the hoses. Thanks. __________________ 1985 K20 350M/SM465/NP208/GM10/GM14

08-21-2010, 10:33 AM	#2
DesertBob Registered User Join Date: Aug 2010 Location: Goodlettsville, TN Posts: 41	Re: 1985 K20 Smog Pump Question btt __________________ 1985 K20 350M/SM465/NP208/GM10/GM14



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