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truck is a 1977 f150 4x4 with a 400. It is equipped with ca emissions equipment so I have a hard time finding the right part often. Any ideas what this is, what it does, and where it should go. Rebuilt the motor and didn't label this little guy.
This is not a 12A170 distributor modulator valve, because there's none listed for any 1977/79 F100/350 w/a 400 (or 351M).
There's another valve that looks similar, basic number is 9D474. The original should have an ID number on it.
Yup, I missed the mark on that one .
9D474 is EGR solenoid vacuum valve.
Older Chilton manuals have the 400 vacuum diagrams.
This vacuum diagram is absolutely fabulous. Does the maintenance repair manual (or Chilton manual) come with a legend/comments section to describe the acronyms?
VCV? = Vacuum Value?
VCDV = Vacuum _______ Valve?
Air BPV = Air Bypass Valve?
Great post 77&79! Never knew I had a vacuum diagram in my old manuals... I'll have to keep an eye out for it when I go to reroute/repair all my missing vacuum lines.
Book is at the house, I am at work. I will check this evening got you. And will post up the date of that Chilton manual.
No rush!
I was just curious if anyone knew if there was a legend/descriptions listed in the manuals. Just helps me to understand exactly what I'm looking at lol
This vacuum diagram is absolutely fabulous. Does the maintenance repair manual (or Chilton manual) come with a legend/comments section to describe the acronyms?
VCV? = Vacuum Value?
VCDV = Vacuum _______ Valve?
Air BPV = Air Bypass Valve?
Great post 77&79! Never knew I had a vacuum diagram in my old manuals... I'll have to keep an eye out for it when I go to reroute/repair all my missing vacuum lines.
VCV=ported vacuum switch
VCDV=vacuum controlled delay valve
Air BPV=Thermactor air by-pass valve (differential without vacuum vent)
VRDV= vacuum retard delay valve
TVV=thermal bowl vent valve
V Rest=vacuum restriction
LCV=load control valve
TVS=temperature vacuum switch
.