BBD Vacuum Piston Gap Adjustment
MDJEEPER
Senior Jeeper
- Posts
- 549
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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??
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??
