Stromberg Idle Jets removal??

[Firechickenzz]

Looking for suggestions on how to remove these Stromberg Idle Jets.
I'm guessing they need to be drilled out. Any other ideas welcomed.

20250704_131912.jpg

[hueyhoolihan]

might want to check out this video if your carbs are Stromberg 97's.

https://www.youtube.com/watch?v=yIyQcqiN-04&t=458s

the part about the idle jets is in the last half.

[petehoovie]

Originally Posted by Firechickenzz

Looking for suggestions on how to remove these Stromberg Idle Jets.
I'm guessing they need to be drilled out. Any other ideas welcomed.

[Firechickenzz]

Originally Posted by hueyhoolihan

might want to check out this video if your carbs are Stromberg 97's.

https://www.youtube.com/watch?v=yIyQcqiN-04&t=458s

the part about the idle jets is in the last half.

Unfortunately he is going over the main jets in the video. The Idle jets are accessed from the top half of the carb. Which are under the gasket he never removes.

[hueyhoolihan]

Originally Posted by Firechickenzz

Unfortunately he is going over the main jets in the video. The Idle jets are accessed from the top half of the carb. Which are under the gasket he never removes.

here's a link to an exploded view of the Stromberg 97 carb. i assume this is the one we're focusing on.

https://www.oneillvintageford.co.uk/...ice-parts.html

it looks like part# 9542 are the idle jets. they look to have threads on them and a screwdriver slot to screw them in and out.

maybe you can post a pic without the gasket, as i'm having trouble envisioning your problem.

here's another video on the Stromberg 97, showing all the fuel circuits including the idle circuit and the jets associated with it. again, i see nothing that blocks access to the screwdriver slot to remove them.

https://www.youtube.com/watch?v=5U3MQUYHUug

BTW, i'm assuming that the heads are covered over with something on purpose by the manufacturer so as to prevent them from being removed. or are they just stuck?

[scicala]

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I've had pretty good luck by tapping the screw head with a screw driver and light hammer. Then with a small propane bottle heat the die casting that surrounds the idle jet to expand it. Then the idle jet should back out unless the screw driver slot is stripped out.
I would also remove the brass float first to avoid melting any solder.

Sal

[aussie merc]

warm up VERY LIGHTLY and retry [boy have they had a hard time] or drill in center and try to easy out also see if you can melt some wax [crayon] down the thread to help lube it up

[Tim Ayers]

Originally Posted by aussie merc

warm up VERY LIGHTLY and retry [boy have they had a hard time] or drill in center and try to easy out also see if you can melt some wax [crayon] down the thread to help lube it up

I've had excellent results doing this. The bodies are made from a type of pot metal, so don't go crazy but warming them up. You may want to use a Dremel and try to repair those screw slots a bit as well. They are really messed up and you don't want to strip it .

[hueyhoolihan]

thanks pete for the closeup. as i now see that the heads are just butchered...

[Firechickenzz]

Zoomed in photo. The slotted heads are messed up.

20250704_131912(1)(1).jpg

[petehoovie]

Originally Posted by Firechickenzz

Zoomed in photo. The slotted heads are messed up.

[aussie merc]

to heat evenly try putting in boiling water for twenty mins will get hot but not crazy

[Andy]

I have drilled a line of shallow holes to replicate the slots. You can get small burrs for Drimel tools to clean the slots up.
A wack with a hammer helps a lot.
I think they are the emulsion jets.
You might want to pull the emulsion tubes and see if they are smashed. You would need a jet wrench to pull the jets
I run a 4-40 tap in and pull them out. The side openings in the tubes are not critical but need tube open. The metering is done by the jets that are damaged.

[kurt v]

left hand tap and left hand machine screw

[Firechickenzz]

For anyone interested I ended up having to drill both Idle jets out. Nothing seemed to work, I even drilled the head and hammered in a torx bit and ended up snapping the bit.

I did chase the threads with a 1/4-24 tap and had to use a bit of Permatex aviation form a gasket on the thread gaps.

[mcgarrett]

When you're ready to replace the jets with new ones, a good practice to keep the problem from happening again is to use "hollow ground" screwdrivers. They fit the slots much more precisely and are less prone to destroying the heads of the jets or other fasteners. I use them for all my carburetor repair work with great success. Gunsmiths use them for the same reasons.

https://www.amazon.com/MidwayUSA-Pie...074360&sr=8-11

[glennpm]

Regarding "hollow ground"