I would like to locate a vacuum diagram for a '78 F-250 2wd Supercab, 460, 4 barrel (Motorcraft 4350), C6, 3.54 axle ratio, engine decal says "Non-Catalyst" D8TE-9C485-BKB. The truck is operating in Canada and was not fitted with an EGR valve, air pump or Cat. from the factory. Thanks for the help.

 

Dennis (Mil1ion) may have what you need.

 

The D8T?-xxxx-xxx number on the engine decal is the decal part number


On the passenger side valve cover is there a white sticker ?

Once decoded it should come out as : 8-97-R0

This is your calibration number and it refeences to the actual driagram & the specs for the tuning of the engine.

 

I looked on the passenger side valve cover but the calibration sticker is long gone. Any other way I could access a correct vacuum diagram? Thanks

 

Well, I haven't heard of a 78 w/o an EGR so it would have been great to have the sticker info.

I can put up a copy of the diagram but It would take a while to scan and send a copy of an illustration of where all the hoses run.

 

It is always possible that the EGR valve may have been removed prior to purchase of the truck in 1986. The location of the EGR valve in after-market repair manuals appears to be on the rear of the carb. spacer. The carb spacer on this truck is a phenolic item with bonded gaskets. (I had to replace the spacer with a dealer supplied Ford part once when the stock carb was removed for overhaul and the gasket surface separated) There is no evidence of a mounting flange for an EGR valve on the spacer or on the intake manifold.

 

Okay so to be clear.

You want the original Emissions vacuum digram for a truck that doesn't have a EGR, air pump.

Are you in Ontario and have to pass an emissions test ?

I'll scan the 78 460 vacuum routing illustration tomorrow for you.

 

After checking out your web site and looking at your list of possible calibration codes it looks like 8-97-RO is the closest to my truck. I live in Edmonton, Ab., so no worries about emission tests. There are two devices in the vacuum system mounted on the passenger side valve cover. One, near the front has the following part # D8TE-9H301-AA, and the second mounted near the centre has vacuum and electrical connections (no #) any thoughts? Thanks for your help.

 

The front one (9H301-AA) is the vacuum vent valve.

Would you like the Illustration ?

 

Yes, I would like a copy of the vacuum diagram. Thanks

 

Is there any way I could get a copy as well?

 

Sorry for the delay, I will be scanning it this afternoon.

 

E-Mail sent.

 

Hi Mil1ion, hate to revive an old thread but I was curious if you still had copies of the vacuum diagram(s)/hose illustrations for the 8-97-R0 calibration code. I'm dealing with the aftermath of a small thermal event (meltdown) leaving half the passenger vacuum hoses crispy!

Thanks!

 

Welcome to FTE.
Unfortunately Mil1ion is no longer a member of FTE,