Free Carburetor Repair Manuals

Manuals are downloaded as PDF files. Some are very large and might take some time to download, depending on your internet connection.Please do not distribute these manuals. Instead giving out the link to this web page would be appreciated. Link is as follows: http://carburetor-blog.com/?page_id=335Please keep in mind that these manuals may span several carburetor models and may not be your exact carburetor. Use these manuals as a general reference only. Don’t forget to visit the technical pages for your specific carburetor. More manuals for specific carburetors may be available there.

 

Autolite, Ford & Motorcraft Manuals & DVDs

Carter AFB Carburetor Manual
Carter AS Carburetor Manual
Carter BB Carburetor Manual 1938 & Prior Also works for bbr1
Carter BB Carburetor Manual 1939 & Later
Carter Brass Bowl Manual
Carter BBD Carburetor Manual
Carter Divorced Choke Adjustment – Older 1955
Carter RBS Carburetor Manual
Carter Thermoquad Carburetor Manual
Carter UT Updraft Carburetor Manual
Carter W-0 Carburetor Manual
Carter W-1 Carburetor Manual
Carter W-1 Climatic Control Carburetor Manual
Carter WA-1 Carburetor Manual
Carter WCD Carburetor Manual
Carter WCD Carburetor Manual – 1962 Rambler – In general, this is ok for any WCD
Carter WCFB Carburetor Manual
Carter WDO Carburetor Manual – 1938 & Earlier
Carter WDO Carburetor Manual – 1939 & Later
Carter WGD Carburetor Manual
Carter YF Carburetor Manual – Older YFs
Holley 94 Carburetor Manual
Holley 740 Carburetor Manual
Holley 852-FFG Carburetor Manual

Holley 885 Carburetor Manual
Holley 885-JJG & 885-JJGC for General Motors Trucks
Holley 1904 Carburetor Manual

Holley 1908 Carburetor Rebuild Manual
Holley 1920, 1940, 1945, 2210, 2245, 5200, 5210, 5300 Carburetor Manual
Holley 1940 Carburetor Manual
Holley 2110 Carburetor Manual

Holley 2300 Corvette – 1968-69 Tripple Carburetors
Holley 2300 Carburetor Manual
Holley 2300 Carburetor Rebuild Manual – from a 1962 repair manual.
Holley 2300C, 2300G, 4150C, 4150G, 4150MG, 4160C & 4160 w/mechanical secondarys
Holley 4000 Carburetor Manual
Holley 4000 Visual Instruction Manual
Holley 4150C Carburetor Rebuild Manual
Holley 4150EG Carburetor Manual
Holley 4150EG Governor Manual
Holley 4150G Carburetor Manual
Holley AA-1 (electric choke) GM Trucks Carburetor Manual


Mercruiser Weber Marine Carburetor Manual


Motorcraft 2100 4100 Carburetor Manual
Motorcraft 2700 7200 Carburetor Manual – large file, but great manual.


Rochester 2G, 2GC Carburetor Manual
Rochester 4G, 4GC Carburetor Manual
Rochester AA Carburetor Manual
Rochester B, BC, BV, AA, BB Carburetor Manual – Be patient, this is a large file.
Rochester BC – Published in 1951
Rochester Dualjet Carburetor Manual
Rochester E2SE Carburetor Manual
Rochester E4ME-E4MC Service Manual
Rochester Monojet Carburetor Manual
Rochester Triple Power Pack Manual
Rochester Quadrajet Carburetor Manual
Rochester Varajet Carburetor Manual

Solex 44PA1 Rebuild Instructions
Solex 44PHH Carburetor Manual
Solex Selection and Tuning of the Carburetor


Stromberg AA Series Description & Operation
Stromberg used on Government Vehicles AA, SF, BXV
Stromberg Service Manual – many Strombergs represented here.
Stromberg WW Carburetor Manual
Stromberg WW Carburetor Manual 1955 Edition

SU – Servicing, Testing & Repairs   Zenith 28 228 Rebuild Manual


Zenith 63M 263M Marine Rebuild Manual
Zenith Gov-U-Retor Specification Chart
Zenith Gov-U-Retor Service Manual  


Marvel Schebler


Recent Posts

Adjusting the Idle Mixture

The Carburetor Idle Circuit and Adjusting the Idle Mixture

The idle circuit is in effect only when idling. Once RPM increases above idle, the Idle mixture screws are no longer in play. If you have the idle RPM set too high, your idle mixture adjustment will be irrelevant. When you turn the idle mixture screw in all the way and the engine doesn’t change, you could have the idle RPM set too high. For example if it was at 1,000 RPM. On the other hand if the idle is normal, then you have a problem in the carburetor, or possibly a vacuum leak.

The idle mixture screws sets the mixture of fuel and air during idle RPM.

Single barrel carburetors will have one idle mixture screw while 2 barrel and 4 barrel usually have 2 idle mixture screws.
You can clean your idle mixture screws by buffing them off with a wire wheel.
Inspect the screw for grooves. Grooves are created when the screw is turned in too tight. Replace any damaged or bent screw.
Inspect the screw hole to make sure it is clear. When you blow through the hole you should get air inside the bore.

For Rochester Quadrajets pick up a idle mixture adjusting tool at most any part store. The tool bends which will make adjusting easier.

When assembling the carburetor turn the idle mixture screws in all the way, gently seat, then turn it out about 1 1/2 turns.

Bring the engine up to operating temperature.
Make sure the choke valve is completely open.
You may have to rev the engine slightly so that the fast idle cam moves to the idle position.
Adjust the idle to specification.

There are a couple of ways to adjust the idle mixture.

1. Using a vacuum meter
Hook the vacuum meter to one of the vacuum ports on the intake, or the carburetor.
Take turns with each idle mixture screw.
Turn each screw out a bit for a start (maybe 1 turn).
Turn each screw in 1/4 of a turn and wait for a second for the vacuum meter to catch up.
Do this until you get the smoothest idle and the vacuum meter stays steady.

2. By ear
Take turns with each idle mixture screw.
Turn the screw out 1 turn to start.
Turn the screw in 1/4 and wait for a second for the engine to catch up.
Keep doing this until the RPM starts to drop.
Turn the screw back 1/4 – 1/2 turn.

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