Quote:
Originally Posted by area man
Thanks everyone, this is really helpful information! I'm going to do the pressure test as per Tony's instructions in a little while, then try the adjustments. two questions though:
1. If you need to raise the cold pressure to get it up to spec, does that mean you have to bring the small pin up, rather than tap it down? And if so do you have take the WUR apart, or is there a simpler method?
2. Does the adjustment you make to the 'cold side' have an impact on the warm pressure adjustment? Looks like it would, just from looking at diagrams. If that's the case does it make sense to do the cold adjustment first? Pls correct me if I'm wrong. the diagram I'm thinking of is this one:
|
#1 See post number 2 in this thread. I think you are correct. Bumping the plug in will decrease control pressure and make your mixture more rich. It also intuitively makes sense from looking at the diagram. Pushing down on the plug levers the pin into the base of the diaphragm squeezing off system pressure.
WUR malfunction repair?
#2 Moving the plug will impact both cold and warm pressure. I want to say in a linear fashion but that would be outside my knowledge base.
Let me get you that pressure graph now.
Edit - Here is ossiblue's comment - "What you'll be doing is moving the diaphragm that regulates the pressure against the pin on the bimetallic arm--narrowing the gap and increasing fuel pressure." He may be right but I (the accountant) think that narrowing the gap would decrease the pressure as it restricts. Need clarity on this.