Ignition system help
Discussion
93 4 litre
I found the vacume pipe that runs from the plenum to the vac advance on the dist was perished so I have cut off the perished section for now.
There is a one way valve fitted in the pipe. One side is marked "dist" & the other "
Carb". The dist side connects to the distributor pipe & vice versa.
When I was checking for leaks after I had cut the pipe I found that the valve is CLOSED if you suck from the plenum side but OPEN if you do the same from the dist side.
Surley this can't be right? For the vac advance to function the valve should allow a vac to be applied to the dist not prevent it?
Any of you guys know if maybe the valve in mine has been assembled wrong or am I missing something?!
I found the vacume pipe that runs from the plenum to the vac advance on the dist was perished so I have cut off the perished section for now.
There is a one way valve fitted in the pipe. One side is marked "dist" & the other "
Carb". The dist side connects to the distributor pipe & vice versa.
When I was checking for leaks after I had cut the pipe I found that the valve is CLOSED if you suck from the plenum side but OPEN if you do the same from the dist side.
Surley this can't be right? For the vac advance to function the valve should allow a vac to be applied to the dist not prevent it?
Any of you guys know if maybe the valve in mine has been assembled wrong or am I missing something?!
I'm a bit confused by this Pete.
I presume that you're referring to the soft rubber vacuum advance tube? If so, I can't see how there's a valve inside it- especially as it's a 5mm pipe.
Mine degraded a couple of years ago and Tower View sold me a replacement- albeit a thicker walled piece- for a couple of quid. I just cut it to size and fitted.
I presume that you're referring to the soft rubber vacuum advance tube? If so, I can't see how there's a valve inside it- especially as it's a 5mm pipe.
Mine degraded a couple of years ago and Tower View sold me a replacement- albeit a thicker walled piece- for a couple of quid. I just cut it to size and fitted.
poorpeet said:
93 4 litre
I found the vacume pipe that runs from the plenum to the vac advance on the dist was perished so I have cut off the perished section for now.
There is a one way valve fitted in the pipe. One side is marked "dist" & the other "
Carb". The dist side connects to the distributor pipe & vice versa.
When I was checking for leaks after I had cut the pipe I found that the valve is CLOSED if you suck from the plenum side but OPEN if you do the same from the dist side.
Surley this can't be right? For the vac advance to function the valve should allow a vac to be applied to the dist not prevent it?
Any of you guys know if maybe the valve in mine has been assembled wrong or am I missing something?!
In that case you're lucky, your valve is still working properly. Its job is to delay the vacuum advance so it doesn't come in transiently when you open the throttle from idle. The on-way valve should be highly restrictive sucking from the plenum, rather than completely sealed. But these valves are often replaced back to front by mistake, or block and stop working, so they can be more trouble than they're worth. It is common to remove them completely (replacing with a straight connector) at the first sign of trouble, just to eliminate another potential problem.
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