Skip to content

How To: machining Schebler float screws

June 21, 2010

Here is another quick How To article from this week’s wrenching sessions.

schebler

 

The Schebler carb was used on the majority of American motorcycles during the 19teens and twenties, my X has a 1” model H.  The float pivot is a simple pin that fits into small holes that are drilled into the ends of two 1/4-28 screws.  One of my screws had fallen out of the carb, so I bought a box of screws from McMaster Carr and did a little lathe work to replicate the missing screw.

 

The hardest part was how to grab the little buggers while cutting them.  I made a workholding fixture from a piece of round steel, with a 1/4-28 threaded hole in it.   First that allowed me to cut the heads of the screws to be smaller.

 

Then the screws were screwed into the back of the fixture, so that the threaded ends were sticking out.  I could then part the screws off to be the correct length, and also drill the small hole for the pivot pin.  I only needed one part, but since none of the shops that supply Schebler replacement parts sell them, I went ahead and made a few extras.

schbcross

 

IMG_3738

Top, standard screw from McMaster Carr

Middle, head diameter turned down

Bottom, original Schebler screw and pin

IMG_3731 

Here is the fixture in the lathe.

IMG_3732 IMG_3734

On the left is the fixture with a screw installed.  I’ve cut it roughly to length with a saw, now it is ready to be faced off and the small hole drilled.

IMG_3735 IMG_3739 IMG_3737  IMG_3742

 

Advertisements
No comments yet

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: