secondary vacuum diaphragm thingy full of liquid
#1
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secondary vacuum diaphragm thingy full of liquid
I've got a 73 Nikki carb on the RX-2. Same deal as RX-7. Last time I rebuilt the carb (a month ago) I took apart the secondary diaphragm assembly and it was full of fuel/oily mixture. Why is this, how do I prevent this from happening again, and how do I know when to drain the goo out before it causes the secondaries not to open?
thanks in advance
thanks in advance
#3
Nikki-Modder Rex-Rodder
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I've encountered this a few times on older carbs. Never on a 83-85 carb.
At first I thought maybe the oil was put in by Hitachi to smooth out the vacuum opening, but of the few that I've found with oil, the amount is never consistant.
So after rethinking this puzzel, I came to the conclusion that the oil wouldn't really fioll the vacuum signal circuit to the primary bore, so then I thought about it being added with the idea of air volume displacement. (?)
I dunno, but I can't figure ANY way that it got there by accident.
At first I thought maybe the oil was put in by Hitachi to smooth out the vacuum opening, but of the few that I've found with oil, the amount is never consistant.
So after rethinking this puzzel, I came to the conclusion that the oil wouldn't really fioll the vacuum signal circuit to the primary bore, so then I thought about it being added with the idea of air volume displacement. (?)
I dunno, but I can't figure ANY way that it got there by accident.
#4
Senior Member
Thread Starter
Originally posted by Sterling
I've encountered this a few times on older carbs. Never on a 83-85 carb.
At first I thought maybe the oil was put in by Hitachi to smooth out the vacuum opening, but of the few that I've found with oil, the amount is never consistant.
So after rethinking this puzzel, I came to the conclusion that the oil wouldn't really fioll the vacuum signal circuit to the primary bore, so then I thought about it being added with the idea of air volume displacement. (?)
I dunno, but I can't figure ANY way that it got there by accident.
I've encountered this a few times on older carbs. Never on a 83-85 carb.
At first I thought maybe the oil was put in by Hitachi to smooth out the vacuum opening, but of the few that I've found with oil, the amount is never consistant.
So after rethinking this puzzel, I came to the conclusion that the oil wouldn't really fioll the vacuum signal circuit to the primary bore, so then I thought about it being added with the idea of air volume displacement. (?)
I dunno, but I can't figure ANY way that it got there by accident.
After getting the car running I spent about a month trying to get it running well. Part of the troubleshooting process was to put new needles/seats in the carb so when I tore it down I opened up the secondary diaphragm - full of the oil/fuel mixture again.
So somehow, when the engine is on heavy load (i.e. < 5 lbs vacuum) goo is getting blow into that circuit and accumulating in the assembly.
A mystery indeed . . . thanks for replying.
Dave
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rx8volks
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09-01-15 11:02 PM