I would keep the check valve.  It could run without it, but that makes the power valve VERY sensitive.  Keep us posted.

You are right, it's hard to solve problems without being there, but we seem to have fairly good luck between all of us.

Going from memory and not measurement, the power valve is about 1-3/16" (30 mm) hex, about 1/4" (6 mm) thick and looks to have a 1/8" BSP pipe size thread sticking out of the middle of it.

I have heard of people completely removing them and sealing the passage since they were so delicate. Never did it myself though.

Kind of awkward, but if you can blow through it, it is shot.

I sure do love my Q-Jet!!!

Dave

Bad day yesterday ?? .Bought new check valve, installed and tested.Again that famous 3000 rpm wall. Tryed from 2° static up till vacuum optimum ( 10 to 12 ° static ) . Nothing.

Bought a NOS octanebooster to be sure of fuel.Extra 7 points it gives at 16 gallons , costs 18 $  

Problem the same.

Got home , bottle of Wiskey nearby and reading manuals....What did i see there ? haha, clearence of main shaft and distributorhousing between .002 and .007 " to be installed by shims above gear .I tought , never inspected that ! Always pushing or pulling by the distributorhouse .....Went over to my garage this midday-break , and pulled the shaft.... it's coming up 1/4 " !!!!!!!!!!!!!!!!!!!! and meanwhile turning on it's gear as if one install the distributor. ??????????

Went back to office SOOOOO happy that MAYBE i have find it now....

I see at the manual that a ring above keeps the shaft at his place , and the shims below give needed clearence . Perhaps that ring got out his groove working on the distributor ???  

COME an SEE TONIGHT !

story to be continued.

 

 

Nothin like a good bottle of whiskey to clear the mind.

Octane boost is little more than "snake oil". what they call a "point" is actually 1/10th of a real octane number. 7 "points" boosts you from 93 octane to 93.7 octane....

Dave

OH  the scheaters ! points... i tought that where octane numbers ! and that at a price off 3X my whiskey , damned  ( not the price , the volume  )

Clearing the mind ? yes , at the begin stage. Useally it ends with sleepwalking to my bed and  myself in the morning ....

 

If there is 1/4 inch play in the shaft two things can happen.  One is as the shaft raises, the timing will change due to rotation of the gear in relation to the cam gear.

The other is even worse.  As the shaft rasies, the pick up or points no longer line up.  The result in poor or no triggering of the primary igntion.  This may account for the voltage change.

Very interesting.  Get the play right, give it a go, and let us know what happened.

Ken,

Why would that not show up with the dwell meter hooked up running or reving the engine. I'd think you should have a big dwell change.

That's how we found bad Ford Distributors that had the retired vacuum advance.

Just a thought!       

Denny

Barry,

If whiskey doesn't work try Brandy..... At least the octane numbers are consistant...

Dave

Still have to go to my garage but as i have seen it, the points remain the same position as they are both fix on the base plate.It is the 8-cam part of the shaft that's gliding vertical over the sliding piece of the points.
So the dwell remains +/- the same . If i'm not wrong the 8-cam get even a bit below the top of the sliding part of the points !!!!!

Yesterday after office to the pub and ended with friends at my home for French Frites ! But today i wonna found out !
Let's hooooope that's the in my silver ghost !

have a nice day , it's weekend !!!!

Unless the point cam lifted far enough to change the points opening, it would not change the dwell.  And that would not change the voltage either.   But again, the voltage could change due to the meter response, and not really change.  So that question remains.  If point opening changed, then the dwell would change.

But the timing change would be very dramatic.  It could change by 10 or 20 degrees, depending on the amount of shaft lift.  A 20 degree timing change will make a radical difference.