valve adjusting screwdriver??
Thread Starter
Instructor
Joined: Nov 2004
Posts: 203
Likes: 8
From: Manassas, Va
valve adjusting screwdriver??
Ok, let me start by stating I've only adjusted my valves (89 C4) once, did it last year.
Since the job is pretty straight foreward, what's this high speed screwdriver going to do to make it eaiser, faster, more accurate? I just cant visualize how it's used, can some shed some light, maybe a pic on it being used?
I dont want to get one and not know how to use the thing or not get one which would make my life eaiser.
Thanks
Since the job is pretty straight foreward, what's this high speed screwdriver going to do to make it eaiser, faster, more accurate? I just cant visualize how it's used, can some shed some light, maybe a pic on it being used?
I dont want to get one and not know how to use the thing or not get one which would make my life eaiser.
Thanks
Rennlist Member
Joined: May 2007
Posts: 2,295
Likes: 37
From: Portland, Oregon
There was a thread on this from 9Meister that started the whole thing rolling. The theory is that the screwdriver has pins on it, set at 36 Deg apart. They are a visual guide so you can get to the magical .1mm opening from a closed valve. It helps getting the initial angle correct, then you verify with a feeler gauge. It may not make the process perfect, but knowing the right angle helps a lot. Also you can hold the screwdriver in place, using the visual guides while you tighten the jam nut, so you wont' have as many tighten/feeler-test/loosen/tighten/feeler-test cycles...
You can check out some links here http://www.tomnjudy.com/porsche
I hear the guy who is making them is a genius.
You can check out some links here http://www.tomnjudy.com/porsche
I hear the guy who is making them is a genius.
Thread Starter
Instructor
Joined: Nov 2004
Posts: 203
Likes: 8
From: Manassas, Va
"It helps getting the initial angle correct, then you verify with a feeler gauge."
I'm obviously missing something. I thought you just loosen the screw, put the feeler in, tighten the screw until the "drag" is right and tighten the screw.
What's the "correct initial angle"??? If I have to verify with a feeler why do I need the special screwdriver?
I'm just trying to understand this thing...
thanks
I'm obviously missing something. I thought you just loosen the screw, put the feeler in, tighten the screw until the "drag" is right and tighten the screw.
What's the "correct initial angle"??? If I have to verify with a feeler why do I need the special screwdriver?
I'm just trying to understand this thing...
thanks
Rennlist Member
Joined: Aug 2007
Posts: 904
Likes: 28
From: Cape Cod, Ma
Starting with the valve screw closed, you reference one point on the screwdriver. Then turn counterclockwise till the other leg lines up with the first referenced point. This brings you very close to the correct valve gap. You can then check with a feeler gauge. As mentioned above, the screwdriver will help you hold the screw in position, while tightening the nut down. This part has always been the hardest for me, since tightening the nut seems to move the screw slightly, changing the gap.
Race Car
Joined: May 2003
Posts: 4,243
Likes: 103
From: SoCal
"Since the job is pretty straight foreward, what's this high speed screwdriver going to do to make it eaiser, faster, more accurate? I just cant visualize how it's used, can some shed some light, maybe a pic on it being used?"
Good comment! Actually, not doing it the more obvious way, i.e. Using a feeler gauge,
requires adjusting all valves including those that may not require such.
Good comment! Actually, not doing it the more obvious way, i.e. Using a feeler gauge,
requires adjusting all valves including those that may not require such.
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Burning Brakes
Joined: Nov 2006
Posts: 1,061
Likes: 7
From: Wilmington, NC USA
Using the feeler guage is not easy to use on these cars for the first time. I tried and could never get the feeler guage in even after I had adjusted them. The angle is very difficult even with the correct porsche feeler guage. That is why I got a dial indicator guage and z-block. I think the screwdriver is a great idea for those that need adjusting.
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Joined: Jul 2003
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From: Atlanta
Using the feeler guage is not easy to use on these cars for the first time. I tried and could never get the feeler guage in even after I had adjusted them. The angle is very difficult even with the correct porsche feeler guage. That is why I got a dial indicator guage and z-block. I think the screwdriver is a great idea for those that need adjusting.
