The idle speed adjustment in any engine is to control the minimum RPM that an engine reaches, in other words how quickly it will run with the throttle all the way off. cm529: Ebook carburetor service manual - 35 pages, 37 MBytes, pdf format. On Stromberg carburetors adjust cold by turning the idle fuel adjustment screws (D) all the way in and then backing out 5/8 of a turn. Recheck mixture screw to lean best idle again. Different specific models require different adjustments, but in general Stromberg suggested 1 to 1 1/8 turns on the idle mixture screws for the type WW. The Stromberg CD carburettor , like the SU (See Adjusting an SU carburettor ), is a constant-depression carburettor , hence the CD. Cam disc for fast idle 10. Re-adjust idle speed screw to obtain desired idle rpm, and repeat procedure again on both idle mixture screws. A common question. Edelbrock Alky-conversion kit. Make sure the link is the proper length. Using a 1/4 metal rod (8-12 in length), insert the metal rod into the bottom end so it rests flush against the base of the needle adjusting screw. Cold-start device 9. Because the idle mixture screws can affect the other side of the carburetor, what . 22 watchers. The idle screw is 1and1/2turns out.I don't know if its the same on another horsepower engine but I have no lag. Thank you gentlemen. what would cause this? idle is adjusted at 950, when i take and drive it the idle jumps to 1500 and won't come down. . The outside collar with the small key way button is to locate the diaphragm stationary and stop it turning the diaphragm (can damage) while turning the centre mixture needle adjustment allen key. If your carburetor cannot be adjusted for proper operation, it may require a rebuild by a competent technician, who is experienced in repairing the Stromberg carburetor. If your carburetor cannot be adjusted for proper operation, it may require a rebuild by a competent technician, who is experienced in repairing the Stromberg carburetor. Step 1: Remove engine air filter. I bolted em right on and the car fired right up and idled smoothly. This should get the needle adjustment screw and star washer traveling in the proper direction. Carburetor Idle Mixture Adjusting Tool Fuel Inlet 7/8"-20 Threaded Insert Coils- (5 pack) Pin Vise Service- Fuel Inlet Thread Repair, Heli-Coil Installation, 7/8"- . kotlin download file from . Step 2: Adjust the air fuel mixture. Examine the inlet manifold and carburetor flange for air leaks. On Stromberg carburetors adjust cold by turning the idle fuel adjustment screws (D) all the way in and then backing out 5/8 of a turn. Checked several individual models, and the maximum range was 1 1/4 turn (maximum rich). Throttle response was much improved and the car ran great. Adjust idle mixture screw - use a vacuum gauge and adjust for smoothest idle (highest vacuum). This may require the use of hand tools, however, many times the air filter and housing are secured using only a wing nut that can often be removed without using any tools. The basic Zenith-Stromberg, as used on Triumphs in the mid-'60s. My '72 US TR6 is equipped with 2 Stromberg Zenith 175 carburetors . Buicks started using these in 1955. Stromberg carb adjust sixth revision. The Stromberg carburetor is a very good unit and will perform flawlessly if inspected and maintained properly. Then turn the same screw out slowly until the engine begins to roll or gallop, then back in slightly to provide the smoothest idle. The 9Super7 carburetor is designed to use Stromberg 97 type rebuild kits and replacement parts such as floats, jets, power valves and air cleaners. How do you adjust idle speed on stromberg 175cd carb?. Zenith-Stromberg Carburetor Adjusting Tool. Part Number 16-1 (5) $4.95. When seating the idle mixture control screws, LIGHTLY seat them. These also work on MGBs from 1975-1980 and MG Midget 1500. He can provide a wealth of information. Stromberg mixture controls offered no advantages. The main thing is to make sure there is a gap between the fast idle cam and the head of the fast idle speed adjustment screw and the fast idle cam (SPZ in my picture) is resting in contact with AB in my picture when you are not using the choke.. The engine should be warm when making the adjustments. Stromberg Idle Adjusting Screws. After years of rumors about. Stromberg CD carbs have a limited amount of possible adjustment and they are very reliable once initially set up. But it is the same manifold and I sent the carb out for a rebuild so I would assume that it came back the same way. It contains several warnings, cautions and notes. Looking into the metering needle hole, you will see the base of the metering adjusting screw. I'm adjusting for best needle position with the engine at running temperature, to see if the soot will clean up. A longer taper screw can be beneficial in some cases as it gives a more sensitive adjustment. Namely, idle jets, dump tubes, power jet, metering jets and special needle valve and seat. Instead I am planning to adjust each bypass valve to an appropriate vacuum setting before refitting the bypass valves and carbs back onto . But maybe not. Part Number: SBC-9541K. Uni-Tech Air Management Systems, Inc. Thanks - V8JR. Drilling for air supply under diaphragm 7. Be careful not to twist diaphragm when tightening screws. However, I can't seem to get the idle to drop to 800 RPM. Anti clockwise for richer, clockwise for leaner mixture, its was usually quite tight to turn also. Stromberg 175 CD-2's have internal adjustment, you must take the carb off the car and then the bypass valves off the carbs and dismantle the bypass valves to access the screws that alter the spring tension. 03-27-2007, 01:14 AM #9. This is a Stromberg Carburetor Mixture Adjusting Tool for Stromberg Carburetors with a fixed needle. In addition to the carburetors manufactured by stromberg, the Bendix Corporation built replacement 97 carburetors under license. To fine tune turn 1 screw 1/4 turn in and check the vacuum reading, if it is higher turn the other screw 1/4 turn in, if it is lower, back off the 1/4 turn and add 1/4 turn out, check the vacuum and if it is higher back off the other screw 1/4 turn. . - Bring idle up to 2500, adjust linkage for equal flow. Stromberg Carburetor Idle mixture screw - 16-1. 2. I changed spark plug heat. Adjustment is done by simply bending the tang. Then, start the mixture screw back into it's threaded hole. Method 1 Adjusting the Air and Fuel Mixture 1 Locate the air filter and remove it. 386-310 . If that still dosen't make a difference, try to balance the two carbs - the idle adjustment near the link on the drivers side carb, and at the front of the passenger side carb. In Stock. Paul Johnson, Wild and Wonderful West Virginia. Remove idle adjustment screws from base of carburetor and redrill holes behind idling . A fuel height gage like the triple level unit in the article: " Carb Tools ". This type of Stromberg was produced from 1971 to 1980. 3) Adjusting the throttle cables so that the throttles move at the exact same time when the grip is turned. All SF series carburetor took advantage of the then exclusive Stromberg double venturi design . It's idling at 1200. Position the air valve so it is standing on the air valve guide rod (upside down). Look for any scores. The Stromberg WW is a two barrel downdraft carburetor first introduced in 1953 and used on various US car and truck models until 1974 and in Australia on Holden vehicles until 1980. (part 1 of 3) -Jul 24, 2007 John Twist takes apart a Zenith Stromberg carburetor. (Idle air mixture screw should be about 1-1/2 turns out from full clockwise.) #1 mistake. Cross Ref.# 386-310, KT203. 64 Stromberg-carburettor, left side, B 20 A 1. #1. SF carburetors. Use a spanner to slacken the large nut just above the jet adjusting screw by half a turn. I had a very savy carb guy tell me that the idle screw adjustment on a Stromberg should be 1 1/2 turns out. Bendix Stromberg PS-5C Pressure Carburetor Question. Disconnect the vacuum retard line and plug the line. With this arrangement, opening the throttle results in a rapid decrease in suction. Zenith stromberg 175 cd-2 carburetor with auto - May 27, 2013 ZS175CD5-T or ZS175CDSET from late model MGB with Auto Choke. There are three steps to doing this on your twin: 1) Obtaining the optimal idle fuel mixture for both carbs. Now, adjust the screw about half way between the two positions, and you will often hear a very slight increase in engine RPM. Verify the compression in each cylinder. hole is n . Most screws are threaded 10x32 except for the late models which may be metric. Quantity: Add to Cart. Turning the screw clockwise reduces the spring pressure and at some point allows the diaphragm to "float", resulting in a sudden increase in idle (symptom we started with). Any questions on a Stromberg, call Bob at 708-267-7111 or email him at uni-tech@earthlink.net . That releases the jet in its housing, but allows it to drop slightly. Turn in for a richer mixture. Turn the first idle screw in slowly (1/4 turn at a time) until the engine begins to lag or run irregularly. Idle vent dirty, out of adjustment (if so equipped). Basically , the Strom. SCREW & SPRING, idle adjusting (knurled head as original) TR2 (AUC721) 3: Jaguar Early Sedans: Fuel, Intake & Emissions: H6 Carburetors, Mk VII: 47: IDLE SCREW & SPRING: . It works great for me. 2) Setting the idle speed screws so both carbs run at the same rpms when the other cylinder is not firing. Stromberg-97s. Rochester Twojet 2G carburetors Stromberg EE-1 carburetors. You want the idle speed to be high enough that the engine will not stop running when the throttle is pulled back, but not so high that it wastes fuel. Use a thread pitch gauge to figure out your size. We . The 45M is for high elevations (plan to change later). 10-32 x 1.071. Fit it into the bore using a circular motion so the cup slides in easier without getting caught. (E) Remove the float from the liquid and slowly rotate to eliminate any bubbles. With the carburettor upside-down, measure the height of the bottom of the float (now at the top) above the edge of the body. Reflect-A-Cool - Heat Reflective Sheet by DEI. The idle stop screw is off to the side of the high-speed needle. $13.95. The Bendix carburetor has two adjustment needles on the top of the carburetor. Check that the fuel pump output pressure is correct. Repeat this same procedure to adjust the other screw. Technical - Zenith Caburetters. 5. I guess now I have to take the fast idle cam back to original. Ask Question Asked 5 years, 4 months ago. Clamp for choke wire 3. Only Center Carburetor Idles, End 2 Simply Dump Carburetors. or Best Offer +C $19.78 shipping estimate. 10.25 . A blade screwdriver with a driving end that fits the segmented slot of the seat. Locate and remove the engine air filter and housing in order to access the carburetor. If none of your existing drivers are big enough----do not attempt to use a too-small driver. It all works well except it idles really fast - I can idle down the road at about 30 mph. Adjust at idle speed. (F) Suspend the float with a suitable hanger, and allow to air dry for 72 hours prior to use. Usage by Make Buick 1955-1961 Chevrolet 1955-58 Chrysler 1955-57 Dodge 1953-70 Desoto 1955-57 GMC 1960-74 Holden 1958 -1980 Fast Idle Cam Hot Air Type Note: Before proceeding with Fast Idle Cam Set . Centralising the jet. Modified 5 years, . Repeat for any additional carburetors (if more. Drilling for air supply to temp. Date: April 27, 2010 02:01PM. - Answered by a verified Mercedes Mechanic When you fit the accelerator pump plunger, dip it in petrol first then flare out the cup end. Offline. Insert the needle adjustment screw like this Once you have the needle adjustment screw started, add the star washer: Star washer in place; note the washer is slightly "cupped" Now use a 5mm deep socket and gently (very gently) tap with a hammer. Four new 97s straight from Stromberg, with stainless hardware and supporting components. Call for details. The height should be 16 to 18mm long for a hollow float or 18.5 to 19.5 mm for a solid float. His business address is as follows. Detailed service information: In-depth introduction to the new Buick Stromberg WW carburetor + step by step overhaul manual. Adjust the idle screw to give the second carb the same indicator reading, and therefore the same air flow as the first carb. The SF series were introduced in 1932, and production was continued through 1968. The Idle only needs to be 7 to 900 RPM with light load or AC on.