CIS Fuel Adjustment Hex Wrench Length

[2jmotorsports]

Does anyone have a factory CIS fuel adjustment hex wrench?

If so can it be maneuvered in the small space between the fuel distributor/air flow meter and the top of the firewall?

If it can how long is it approximately?

This replacement one I purchased a while back is way too long (6 inches) and Im going to have to cut it down but Id rather cut it once than sneak up on it with 30 hits on the bench grinder.

Thanks in advance.

[SkiVT]

Size of allen wrench for CIS Fuel Adjustment??

Not sure it works well with the metal fuel lines. I use a 3mm allen wrench that doesnt have the large metal loop at the top that the official tool had.

[Flat6pac]

The long 3 mm Allen in any set will do the job
You don’t want to turn it very far either way
On an 83 you need to disconnect the ox sensor to adjust enrichment.
Bruce

[proporsche]

the original tool to set the c/o is made by Stahlwille company..like this one..on top

Ivan

[manbridge 74]

Nice picture. OP can use it as a scale to cut down tool if he still has the plug (missing on a lot of cars).

[47silver]

I found my plug on the fan shroud behind the filter housing when i was working on it. Seems to be an easy place to lose it

[proporsche]

here is a detail.....for manufacturing use

[dhanl82]

I thought this might be of some help.
I have a 1982 SC with the metal fuel distributor lines. I was having difficulty with the handles of adjustment tools contacting the fuel lines so I made the two homemade tools in the attached pictures that slide down within the fuel lines and work very well.
the white one is made from a pvc hollow plug - I inserted the Hex tool and then filled the cavity with JB weld. The yellow ones is a wire nut filled with JB weld with a hole drilled for a cut off nail to be inserted. The white one id made with a "ball" end hex that make it a lot easier to insert. Total length of handle and hex is 4.5 " for the white one and 4.75" for the yellow one.

Anyway, these work great for me so perhaps this might help someone.

Dave

[2jmotorsports]

Thanks for the feedback everyone. Ill see what I can figure out with my current wrench or with another one.

Originally Posted by Flat6pac

The long 3 mm Allen in any set will do the job
You don’t want to turn it very far either way
On an 83 you need to disconnect the ox sensor to adjust enrichment.
Bruce

Thanks for this tidbit Bruce, O2 sensor will be disconnected beforehand.

[2jmotorsports]

Just to close the loop on this. The T-handle tool is way too long. I ended up using a long 3mm allen wrench and it worked like a charm.

Also, there is very little clearance with the metal fuel lines in the way such that the T-handle one wont work even if its the right length. I will likely cut it shorter to 10.5cm like the factory tool in the linked thread, and cut the T-handle so it looks more like a letter P. The only advantage to that over a standard wrench is a bit more leverage when turning with your fingers.



Thanks again everyone.

['78 SC]

Originally Posted by 2jmotorsports

Also, there is very little clearance with the metal fuel lines in the way such that the T-handle one wont work even if its the right length. I will likely cut it shorter to 10.5cm like the factory tool in the linked thread, and cut the T-handle so it looks more like a letter P. The only advantage to that over a standard wrench is a bit more leverage when turning with your fingers.

I also found the T-handle interfered with getting the tool in and out. I cut it down as you described and added some red shrink tubing for visibility.

[RDM]

I did this adjustment yesterday. The t-handled allen wrench that I bought specifically for this job was useless. To make it work would have required the same mods you see here- cut it short (~10cm) and remove one of the ears.

Turns out that my regular 3mm allen wrench with a ball end was the perfect tool. You don't need much leverage (at least I didn't) and you don't want the handle very long because there isn't much space to get it in and there isn't much space to turn it.