#1  
Old 09-21-2021, 04:51 PM
carbking's Avatar
carbking carbking is offline
Ultimate Warrior
 
Join Date: May 2000
Location: Eldon, Missouri 65026
Posts: 3,625
Default Rochester 2G, 4G power valve tool

There was a comment in the tripower section about a slotted screwdriver to use with the Rochester power valves. This tool can be made by anyone with a screwdriver of the correct blade thickness and a hacksaw.

But, both Carter and Stromberg supplied a tool for their power valves (or the Carter multiple jet) that is much better for someone that works on carburetors more than occasionally. This tool may be made (or acquire one of the factory tools).

A word picture:

One starts with a piece of 7/16 inch steel rod about 6 inches in length, and a junk 3/8 drive socket

Chuck the rod into one's lathe and drill a hole in one end 3/4 inch deep using a number 42 drill (0.093) inch.

Now, remove the rod from the lathe, and using a mllling machine, remove 0.196 material from the both sides of the same end, leaving a "screwdriver" blade 0.040 wide, and 0.075 tall.

Cut the socket drive from the socket, and weld the opposite end of the rod to the socket drive.

Observe that when using the tool on a power valve, the power valve plunger will be inserted into the center hole, thus no force will be exerted on the plunger, thus no damage to the seat will occur.

Also observe the "screwdriver" blade has a straight "vertical" rather than the tapered "vertical" of a conventional screwdriver; thus the slot will not be damaged on power valves one tries to remove from carburetors that one salvaged from the bottom of a pond

And the old saying "a picture is worth a 1000 words"; here are three:

https://www.thecarburetorshop.com/Po...lve-tool_1.jpg

https://www.thecarburetorshop.com/Po...lve-tool_2.jpg

https://www.thecarburetorshop.com/Po...lve-tool_3.jpg

Jon

__________________
"Good carburetion is fuelish hot air".

"The most expensive carburetor is the wrong one given to you by your neighbor".

If you truly believe that "one size fits all" try walking a mile in your spouse's shoes!

Owner of The Carburetor Shop, LLC (of Missouri).

Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings.
The Following 2 Users Say Thank You to carbking For This Useful Post:
  #2  
Old 09-21-2021, 06:14 PM
Dick Boneske's Avatar
Dick Boneske Dick Boneske is offline
Ultimate Warrior
 
Join Date: Mar 2004
Location: Winneconne, Wisconsin
Posts: 5,387
Default

I've just been using a large screwdriver for the power valve on Rochester 2G carbs. The spring loaded plunger simply depresses to the bottom of the screwdriver slot. Have I missed something?

__________________
BONESTOCK GOATS

'64 GTO Tripower Hardtop (Wife's Car)
'64 GTO Tripower Post Coupe (My Car)
'99 Bonneville SE Sedan
  #3  
Old 09-21-2021, 06:26 PM
carbking's Avatar
carbking carbking is offline
Ultimate Warrior
 
Join Date: May 2000
Location: Eldon, Missouri 65026
Posts: 3,625
Default

The plunger is not overly substantial in strength; have seen a number which are bent, and will no longer seat.

Jon.

__________________
"Good carburetion is fuelish hot air".

"The most expensive carburetor is the wrong one given to you by your neighbor".

If you truly believe that "one size fits all" try walking a mile in your spouse's shoes!

Owner of The Carburetor Shop, LLC (of Missouri).

Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings.
  #4  
Old 09-21-2021, 06:59 PM
Tom Vaught's Avatar
Tom Vaught Tom Vaught is offline
Boost Engineer
 
Join Date: Dec 2001
Location: The United States of America
Posts: 31,294
Default

I don't do much with Rochester 2 BBL carbs these days, still have a massive number of cores though. I have two of the long Sears screw drivers with the mods Jon mentions in his post. (PV Stem Notch and straight sides.)

The Mechanic at the Pontiac Dealership pointed out that the Power Valve could be damaged as some of the Power Valves are really hard to remove.
So I made the tools, 50 years ago.

Tom V.

__________________
"Engineers do stuff for reasons" Tom Vaught

Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 08:37 PM.

 

About Us

The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.

 




Copyright © 2017