BBD Vacuum Piston Gap Adjustment

BBD Vacuum Piston Gap Adjustment

MDJEEPER

Senior Jeeper
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Location
Calvert County, Southern Maryland
Vehicle(s)
1986 Jeep CJ

Mostly stock, 258 c.i.d., T-176 tranny, Dana 30 front, AMC 20 rear, Dana 300 t-case, 31x10.50 tires, 2 inch body lift
Guys,

I'm trying to adjust the vacuum piston gap on my BBD (at least until I dump or rebuild the carb). The fsm says the gap is supposed to be .035. To measure this gap, I am inserting little ignition feelers under the silver tang as far as I can get them. However, no matter how far I adjust the set screw, the feelers I'm using remain sloppy loose in the gap. So, I am obviously doing something wrong.

What's the secret to measuring the gap correctly? Am I even measuring the right place?? :wtf:
 
It's a bitch. You are looking for a small air gap between the upper and lower tangs. .035 is correct.May the force be with you.
 
It's a bitch. You are looking for a small air gap between the upper and lower tangs. .035 is correct.May the force be with you.

Thanks! Any specific tips at all to get that measurement somewhere near accurate??
 

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