Topic: Article TSB #404 - 4V Carb Secondary Control Lever

[J_Speegle]

Doing a series of TSB info dump threads since I was in the collection today and figured I should gab a handful while I had them out

As the title stated this was a fix suggested to the servicing managers and mechanics after deliver to address complaints or issues.



These are being provided for educational and discussion purposes only from the original documents

[jwc66k]

The Palnut is included in the 75 MPC.
Jim

[J_Speegle]

The Palnut is included in the 75 MPC.
Jim

Is it in earlier versions?  I would think so but haven't checked

[69cobrajetrugae2]

Starting at 12.20 is the big struggle with a 4100. 

I forget how I removed the palnut but it was either a miniature cutoff wheel or a pair of tiny needle nose pliers and pointy wire cutters.

I left the palnut off and assembled the secondary circuit to confirm that the butterflies would open and hold on a vacuum pull since the slightest air leak or passage restriction would render the circuit weak and ineffective, your 4 barrel fun just went out the window!

Oh yes, and be darn sure the secondary diaphragm is oriented correctly before you push the new palnut into position and have to remove it,  ask me how I know.