what is the basic number of turns from the crimp collar I should set the smoke/fuel screw to. I made a mistake of not noting that value. Now it is a whole lot difficult to get it idling again. I did find that one of the fuel supply hoses was not fully crimped and was leaking air -- contributing to near impossibility of getting the engine to idle. Now with that resolved I want to know how many turns so I can get close and then adjust ever so slightly. I have read that it is very very fine adjustment (1/8th of the turn can make or break the tune)
thank you all
Hmm.. I think that if you measure turns in in that the screw only makes a half turn.. or 180*
I think it is near 25 half turns?
What exactly did you do that you have had this happen? if you have taken the pump apart then there may be more issue as to why this is happening then just the fuel screw.
ELABORATE
yes I have rebuilt the injection pump (bosch kit) and the link from the FAQs section on how to do a rebuild from start to finish.
However I have not recoreded how many turns was the screw back out to begin with so I don't have the starting point. all the way in is just produces a great cloud of smoke.
is it 1 full revolution or is it 2 full revolution to get close to full factory setting??
I have set it at half a revolution, because that was the setting that the engine would start. But the engine would so run at very very high idle. I still have hard time getting it started (it is 60F out here). My static timing is .85 mm. I have let it smoke out to purge out the fuel.
So I am stumped at what is preventing it from starting easily like it was before the rebuild
Ok, so if it runs at all that means you didn't screw anything up inside
There are two things that are likely causing your problems. They could both be off and it would cause super wonky running issues.
1. Did you record the relation of the throttle lever and the small 10mm shaft that is in the middle of the throttle springs? It needs to be back where it originally was or it pulls on the internal throttle lever too much or too little causing funky idle.
2. The fuel screw needs to be backed out some.. I don't know what you mean you have it set at "half a revolution", I am unaware what this means. Let me run outside. I am pretty sure I have it written down.
Also I would advance that timing, even for a stock motor doing normal driving.. 0.85mm is in most peoples opinions too low. I am not sure what kinda motor it is non-turbo or Turbo, but 1.00mm non-turbo and 1.05mm turbo is generally accepted.
Just ran outside, I have the measurements written down. A stock fuel screw from the face of the lid where the fuel screw threads in to, to the very end of the fuel screw is 31/32". Which equates to 15 and 1/2 turns, from fully un-threaded, to where it is stock.
15.5 turns.
if you have a crimped on collar on your fuel quantity screw, then just wind the screw in all the way to the collar, and adjust the idle to match..
thats where they come set from the factory...