first post here
I just bought a 1979 Dodge B100 with a slant six in. I am in the process of putting the airpump and cat back on and have no idea where the hose off of the diverter valve is supposed to go. Anybody?
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| Author: | Mpatch [ Tue Jul 30, 2013 5:58 pm ] |
| Post subject: | Dodge B100 van question |
first post here I just bought a 1979 Dodge B100 with a slant six in. I am in the process of putting the airpump and cat back on and have no idea where the hose off of the diverter valve is supposed to go. Anybody?
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| Author: | Reed [ Tue Jul 30, 2013 8:14 pm ] |
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This looks like a job for a factory service manual. |
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| Author: | Mpatch [ Tue Jul 30, 2013 9:32 pm ] |
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I have been looking for one but all I can find is back to 1980. |
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| Author: | Reed [ Tue Jul 30, 2013 10:30 pm ] |
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A steal at $65 including shipping: http://www.ebay.com/itm/1979-Dodge-Van- ... 00&vxp=mtr |
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| Author: | Nomad [ Wed Jul 31, 2013 7:53 am ] |
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$5.92 @ biblio.com  http://www.biblio.com/details.php?dcx=473118116&aid=bkfndr |
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| Author: | Mpatch [ Wed Jul 31, 2013 11:44 am ] |
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Well damn I just ordered one for $40 off fleabay |
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| Author: | Reed [ Wed Jul 31, 2013 1:28 pm ] |
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WOAH! I need to check out Biblio more often! |
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| Author: | Mpatch [ Mon Aug 05, 2013 8:20 pm ] |
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Well I got the service manual and it has next to nothing about the air pump and its plumbing. Matter of fact it's the only thing on the whole van not covered. |
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| Author: | Reed [ Mon Aug 05, 2013 8:26 pm ] |
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Look at the very back in the emissions section. It is there. You could also look at the sticker on the bottom of your hood. |
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| Author: | Mpatch [ Mon Aug 05, 2013 9:20 pm ] |
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all that is shown is the diverter valve and nothing else both in the manual and under the hood Could it be that there is no air injection into the engine and the only air line goes to the capped bung on the exhaust? |
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| Author: | Reed [ Mon Aug 05, 2013 9:42 pm ] |
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Yes. It is possible that in 79 you only had air injection either directly into the catalytic converter or into the exhaust pipe. Go by what your service manual and sticker say. Does your head have the port to the rear of the #6 exhaust manifold? If so, is it capped? |
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| Author: | Mpatch [ Mon Aug 05, 2013 9:53 pm ] |
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It has the port but it is capped and looks like it has always been that way from looking at the paint and bolt head. There is nothing about the air pump on the sticker or in the manual. In the emissions section it stops at the diverter valve and in the exhaust part it stops between the cat and the engine. |
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| Author: | MiDi [ Mon Aug 05, 2013 10:11 pm ] |
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Sorry the only Van book (that I know I have) is this one, and I do not see the info you are looking for in it. I am in the middle of scan'n it to a pdf file and about 10 other book also.  again a fsm is worth its weight in gold, but an aftermarket book is good also ... just not as good. I also just checked Direct Hit and Mitchel for a 1979 Dodge B100 3.7L, Vin B, Eng Cfg L6, USA/Canada and actually came up with nothing ... wow! |
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| Author: | Reed [ Mon Aug 05, 2013 11:32 pm ] |
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OK. If I am remembering correctly, the diverter valve sits on top of the air pump and directs flow to one of two places. The places could have been the port on the back of the head, the bung in the exhaust pipe directly below the exhaust manifold flange, the catalytic converter directly below the exhaust manifold, or the catalytic converter farther back in the exhaust line. I will go through my service manuals and see if I can come up with a diagram close to what you need............... OK. The oldest manual I have is for an 83 van, so all of this info is coming rom the 1983 factory service manual. It is possible that what you have is not a diverter or switching valve, but a relief valve. The relief valve bolts to the air pump and looks very similar to a diverter valve or switching valve but it only has an output to the bung in the exhaust pipe directly below the exhaust manifold flange. According to the 1983 FSM: "The purpose of the relief valve is to control the pressure within the system, by diverting excessive pump output at higher engine speeds to the atmosphere through silencer material in the relief valve." In 1983 the switching valve was only used on California emissions packages. There was also a combination switching/relief valve, presumably also used only on California emissions packages. I can post pictures of my shop manual (sorry, my scanner is a PITA to use) if you would like to see them. Can you post a picture of your air pump including the valve as well as the emissions sticker under your hood? Even if your van was a California model, I doubt it would have a switching or diverter valve on the air pump in 79. I am fairly confident that what you have is a relief valve that has no external vacuum control on it. |
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| Author: | Mpatch [ Tue Aug 06, 2013 2:01 pm ] |
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