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Dimensions for Special Tool 9156
I'm wanting to adjust my Idle / CO mixture, but I continue to overshoot each time I try. I know I'm close. The problem I believe that I am having is that the tool I am using to adjust is small due to the confined space.
I believe that the factory tool 9156 is a very long handled hex key in order to be able to make very small adjustments. A few degrees seems to make a large difference, so I believe a finer resolution can be had by making a very long arm hex key. I have a 9156 tool ordered, but I'm not sure when it will show up. Does anyone have dimensions for the short leg on the 9156 tool? I have a 9" long ball end hex rod that I intend on heating and bending, but want to make the bend in the right location. My 930 is a 1983 European model. Any help that could be provided would be a benefit. Thank you, John 
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John Flesburg 2016 981 Boxster S.................| 1983 911 Turbo - (White) 1974 911 3.2 - Red Car........... | 1974 914-6 3.2 - (Silver) 1974 914-6 3.2, GT -(Red).......| 1974 914 - 2.7 GT Clone (TBD - Saphire?) 1971 914 (TBD)..................... | |
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08-12-2013, 06:15 PM
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Does nobody have this tool?
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John Flesburg 2016 981 Boxster S.................| 1983 911 Turbo - (White) 1974 911 3.2 - Red Car........... | 1974 914-6 3.2 - (Silver) 1974 914-6 3.2, GT -(Red).......| 1974 914 - 2.7 GT Clone (TBD - Saphire?) 1971 914 (TBD)..................... | |
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08-13-2013, 05:51 PM
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,249
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It's a 3mm allen head wrench. Nothing special.
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08-13-2013, 07:00 PM
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Join Date: Nov 2007
Location: Rockwall, Texas
Posts: 8,559
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No way are you going to get a long allen wrench in there - I have a ball end one that is 4" and could not fit it in there and had to use a much shorter one . . .
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08-13-2013, 07:17 PM
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Posts: 1,082
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When I had CIS......
I just took a 3mm "T" handle allen wrench and trimmed it down with a wonder wheel. Took less than a minute and worked perfectly. |
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08-13-2013, 07:49 PM
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Quote:
My guess is that the short bend on the special tool is just slightly shorter than the "long" arm of a short hex key. The one I have been attempting to use is a short hex key using the long leg to engage the spring loaded key and turning the hex key with the short leg. A much longer leg would give more fine adjustment. I would think that a t-handle hex wrench would get in the way of other items in the area, but I may be wrong. Tonight I think I am real close with the adjustment. Please confirm that I am making these adjustments correctly, my final adjustment is from lean (slight hunting of idle) to rich (smooth idle no hunting). Mind you, these "adjustments" are tiny. My last adjustment tonight, I believe I only moved the end of the hex key about 1mm. (looking down on the spring loaded key, turning clockwise is richer). Thanks for your help. On a related topic, what is a "good" combustion gas tester that won't break the bank? I have a Gunson Gastester, but I don't really feel that it is accurate enough.
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John Flesburg 2016 981 Boxster S.................| 1983 911 Turbo - (White) 1974 911 3.2 - Red Car........... | 1974 914-6 3.2 - (Silver) 1974 914-6 3.2, GT -(Red).......| 1974 914 - 2.7 GT Clone (TBD - Saphire?) 1971 914 (TBD)..................... | |
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08-14-2013, 07:52 PM
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Join Date: Oct 2006
Location: MYR S.C.
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i have a short 3mm i just leave in there.
the 930 is not like a 911. a very very small movemnet makes a big difference in afr. try turning it a lot CCW then come back to where you think it should be.
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86 930 94kmiles [_  _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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08-15-2013, 04:56 AM
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Join Date: Nov 2007
Location: Rockwall, Texas
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Quote:
Too lean usually causes an idle misfire/rough idle. |
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08-15-2013, 08:42 AM
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Quote:
I thought turning the adjustment screw clockwise (viewing the spring loaded key from above), made the mixture richer. The surging/hunting (when fully warmed up) stopped on the last 1-2mm turning clockwise. Today, I have a rock solid 900 RPM idle when warmed up. However, on the cold start, I still get a single muffled backfire and can hear the sensor plate thud then after that event, all is good with the world. 
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John Flesburg 2016 981 Boxster S.................| 1983 911 Turbo - (White) 1974 911 3.2 - Red Car........... | 1974 914-6 3.2 - (Silver) 1974 914-6 3.2, GT -(Red).......| 1974 914 - 2.7 GT Clone (TBD - Saphire?) 1971 914 (TBD)..................... | |
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08-15-2013, 10:25 AM
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Join Date: Jul 2008
Location: Central Washington State
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I'm with most everyone else....just took a standard allen wrench, stuck it in there and left it in place. But a much longer handle would help to give more torque when adjusting and a finer feel. Somewhat challenging to modulate the right amount of turning with such a short handle.
Most of these cars like to run sligthly rich at idle. If you've got a good steady idle, no hunting going on and your eyes aren't bleeding from too rich exhaust, then call it good. The Gunson Gastesters aren't perfect (I still have one but haven't used in awhile) but functional. I found that rather than connecting to a battery - which slowly discharges and can cause your calibration to drift - I hooked it up to a 12V DC transformer (the kind you plug into 120AC wall sockets). Let it fullly warm up for at least 20 minutes, recalibrate, and go for it. They give a good ballpark reading, then adjust from there with an on-board AFR setup. All else fails, since you're in Indiana, just a short drive over to Cole's abode and you'll be in good hands.
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, B&B intercooler, stock 3LDZ. |
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08-15-2013, 12:05 PM
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Quote:
__________________
John Flesburg 2016 981 Boxster S.................| 1983 911 Turbo - (White) 1974 911 3.2 - Red Car........... | 1974 914-6 3.2 - (Silver) 1974 914-6 3.2, GT -(Red).......| 1974 914 - 2.7 GT Clone (TBD - Saphire?) 1971 914 (TBD)..................... | |
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08-15-2013, 07:08 PM
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Location: Central Washington State
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Quote:
http://forums.pelicanparts.com/911-930-turbo-super-charging-forum/614464-old-guys-latest-hairbrained-project.html
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, B&B intercooler, stock 3LDZ. |
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08-15-2013, 07:53 PM
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Quote:
He's about as far away as could possibly be and still be in Indiana. That is a pretty cool homegrown 934 he has built.
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John Flesburg 2016 981 Boxster S.................| 1983 911 Turbo - (White) 1974 911 3.2 - Red Car........... | 1974 914-6 3.2 - (Silver) 1974 914-6 3.2, GT -(Red).......| 1974 914 - 2.7 GT Clone (TBD - Saphire?) 1971 914 (TBD)..................... | |
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08-16-2013, 06:57 PM
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As promised, here is a picture of the special tool.
As you can see, the "short" arm of the special tool is slightly shorter than the long arm of the short wrench I had been using. The new tool, having a much longer arm, allows much more fine adjustment of the screw. I believe I have mine adjusted the best that can be done. The short arm on the special tool is 55mm from the end to the center of the longer arm. 
__________________
John Flesburg 2016 981 Boxster S.................| 1983 911 Turbo - (White) 1974 911 3.2 - Red Car........... | 1974 914-6 3.2 - (Silver) 1974 914-6 3.2, GT -(Red).......| 1974 914 - 2.7 GT Clone (TBD - Saphire?) 1971 914 (TBD)..................... | |
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08-24-2013, 07:23 PM
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