SPArKy_Dave 8,872 Posted May 22, 2020 (additional pics/info added - 03-03-23) The Italian made Weber 34adm Carburetor, was factory fitted to XE/XF Falcon 6cyl, Ford F100-350's and Ford Bronco 6cyl. It existed as factory fitment, from mid 1982, up till March 1993 - when the XF Falcon commercial range ended, and the XG Falcon was launched. The stock 34adm carby, has a flow rate of 230cfm. (see flow test pic, further down) For an easy upgrade, a 38/38 Weber carburetor has a 390cfm flow rate, and bolts directly to the stock intake manifold. The purpose of this thread, is to have Technical and Parts info for the Weber 34adm Carburetor, all in one location. I will edit and add to this first post, as I find further info. If anyone has any additional info on these carby's, they're most welcome to add it into the thread. Exploded_view_of_WEBER_34_ADM_0_USD.pdf List of parts: No Part No Price Pcs Description 1 31716.461 $ 0 1 Carb Top Cover 2 37022.004 $ 10.3 1 Filter element 3 64700.005 $ 0 6 Top Cover Fixing Screw 4 64010.034 $ 0 1 Choke throttle valve 5 64525.003 $ 0 2 Choke plate fixing screw 6 10015.274 $ 7.8 1 Choke shaft 7 10140.501 $ 1 1 Locking Ring 8 41565.008 $ 0.8 1 O ring 9 55510.034 $ 0.4 2 Lock Washer 10 64700.001 $ 5 2 Fixing Screw 11 52135.018 $ 3 1 Dust seal plate 12 61070.002 $ 3 1 Dust seal plug 13 57804.446 $ 0 1 Auto Choke Assy. Including 14 64560.004 $ 0 3 — Diaphragm cover fixing screw 15 64595.005 $ 5.8 1 — Diaphragm adjusting screw 16 32384.060 $ 0 1 — Diaphragm cover 17 47600.229 $ 0 1 — Diaphragm loading spring 18 47407.226 $ 0 1 — Choke diaphragm 19 47605.030 $ 0 1 - Return Spring 20 41640.052 $ 3 1 Auto Choke Body Gasket 21 57804.483 $ 0 1 Autochoke Thermostat 22 52135.029 $ 2.4 1 Choke Lock Ring 23 64615.004 $ 0 3 Screw 24 52570.006 $ 6.5 1 Idling jet holder 25 41565.002 $ 0.4 1 Idle jet holder O Ring seal 26 74403.060 $ 3 1 Secondary idle jet 27 64700.010 $ 0 2 Fixing Screw 28 55510.038 $ 0 2 Lock Washer 29 31800.027 $ 0 1 Capsula minimo accelerato 30 - $ 0 1 Carburetor Body 31 47600.007 $ 2.3 1 Idle Screw Spring 32 64625.012 $ 6.5 1 Throttle Adjustment Screw 33 64595.013 $ 0 1 Secondary throttle adjusting screw 34 67016.092 $ 0 1 Carburettor shaft base. including: 35 10000.264 $ 0 1 Primary Throttle Shaft 36 41575.010 $ 3.2 1 Bushing 37 10015.273 $ 0 1 Secondary Throttle Shaft 38 64005.113 $ 0 2 — Throttle valve 39 64520.027 $ 0.6 4 Throttle plate screw 40 45048.124 $ 0 1 Throttle control lever 41 64595.035 $ 0 1 Throttles adjusting screw 42 34715.014 $ 1 1 Throttle Spindle Nut 43 55520.002 $ 1 1 Shaft Lock Tab 44 12775.092 $ 0 1 Boccola guida leva allentata 45 45069.092 $ 0 1 Lever 46 47610.175 $ 0 1 Molla leva allentata 47 47610.091 $ 0 1 Choke lever return spring 48 55555.019 $ 0.9 1 Shaft Spacer 49 41575.010 $ 3.2 2 Bushing 50 64700.016 $ 0 2 Fixing Screw 51 55510.018 $ 0 2 Lock Washer 52 61075.013 $ 4 1 Idle mixture tamper proof plug 53 64750.080 $ 0 1 Idle Mixture Screw 54 41565.010 $ 0 1 Idle Mixture Screw O Ring 55 39152.015 $ 0 1 Base Spacer Heat Gasket 56 43914.060 $ 0 1 Idle Cut Off Solenoid 57 55530.020 $ 0 1 — Rosetta ondulata 58 74409.060 $ 3 1 — Idle jet 59 41535.024 $ 0 1 Guarnizione Intercettatore minimo 60 34710.003 $ 1 1 Throttle Shaft Nut 61 55520.004 $ 1 1 Throttle Shaft Lock Washer 62 14850.140 $ 0 1 Pump Cam 63 12750.103 $ 0 1 Boccola distanziale leva allentata 64 55530.014 $ 0 1 Rosetta ondulata leva allentata minimo accel. 65 45067.048 $ 0 1 Leva allentata comando mimmo accelerato 66 10140.304 $ 0 1 Anello elastico ritegno leva allentata 67 55510.081 $ 1.2 1 Washer For Shaft 68 55525.001 $ 0 1 Spring Washer 69 34705.001 $ 0.8 1 Secondary shaft fixing nut 70 47600.092 $ 0 1 Pump Spring 71 47407.146 $ 0 1 Pump diaphragm 72 32486.084 $ 0 1 Accelerator Pump Cover 73 64565.001 $ 0 2 Screw 74 64700.019 $ 0 2 Pump Cover Screw 75 34715.003 $ 0 1 Nut 76 32240.501 $ 0 1 Interruttore unipolare 77 14975.081 $ 0 1 Cavo unipolare 78 58510.008 $ 0 1 Staffa interruttore 79 47407.182 $ 0 1 Membrana valvola piena potenza 80 47600.005 $ 3.5 1 Starter Valve Spring 81 32384.046 $ 0 1 Coperchio valvola piena potenza 82 64565.001 $ 0 3 Screw 83 64565.001 $ 0 4 Screw 84 52000.015 $ 1.1 1 Float pivot 85 32484.044 $ 0 1 Coperchio pompa pneumatica 86 47600.279 $ 0 1 Spring For Diaphragm 87 47407.163 $ 0 1 Membrana pompa pneumatica 88 73801.210 $ 3.7 1 Main jet 88 73801.140 $ 3 1 Main jet 89 61440.220 $ 9 1 Primary Emulsion Tube 89 61440.491 $ 0 1 Secondary Emulsion Tube 90 77201.160 $ 3 1 Secondary air correction jet 90 77201.170 $ 3 1 Primary Air Corrector Jet 91 76407.060 $ 13 1 Pump jet 92 41565.001 $ 0 1 Pump Jet ´O´ Ring 93 41565.008 $ 0.8 1 O ring 94 61075.002 $ 0 1 Tappo coperchio sgolfatore 95 70508.450 $ 0 1 Auxiliary Venturi Secondary 95 70508.450 $ 0 1 Auxiliary Venturi Primary 96 41705.072 $ 0 1 Top Cover Gasket 97 41015.004 $ 33.2 1 Float 98 79510.175 $ 0 1 Needle & Seat 99 83102.070 $ 1 1 Gasket for Needle Valve 100 43921.100 $ 0 1 Intercettatore ricircolo completo di: 101 55530.016 $ 0 1 — Wavy Washer 102 58000.019 $ 0 1 — Cup Washer 103 41565.001 $ 0 1 — Idle jet holder O Ring seal 104 74409.100 $ 3 1 — Idle jet 105 61002.019 $ 0 1 Fuel Filter Cover 1. Throttle nudger: On the XE/XF Falcons this is used to hold the throttle open slightly during an overrun condition by applying vacuum at the hose fitting. The screw in the top sets how much the throttle is held open.2. Accelerator pump accumulator: Receives the fuel charge from the accelerator pump and controls the discharge rate of the fuel into the air stream.3. Fuel inlet fitting.4. Fuel filter plug. There is a small plastic filter under this plug.5. Fuel return. On some models this is used to return fuel to the fuel tank when item 6 (below) is fitted.6. Fuel return solenoid fitting. On some models there is a solenoid screwed into this fitting that energises when the throttle is closed, allowing fuel to return to the tank when at idle.7. Idle solenoid. Allows fuel to flow in the idle circuit when this solenoid is energised. +12 Volts must be applied to this solenoid when the ignition is switched on.8. Power bypass circuit actuator diaphragm. Allows fuel to flow in the power bypass circuit when low manifold vacuum is sensed.9. Accelerator pump lever.10. Electric automatic choke mechanism. Under the green plastic cover there is a heater element and a bi-metallic spring. +12 Volts is applied to the threaded stud in the centre when the ignition is on. The heater element heats up and in time, causes the bi-metallic spring to rotate the choke shaft, causing the choke to open. Loosening the three screws allows the cover to rotate, to adjust the choke to the correct fully open position after warm-up.11. Fast idle screw. Adjusts the fast idle speed. Operates whenever the choke is partially closed. There are several steps of fast idle due to the operation of a stepped cam inside the choke mechanism. Adjustment should be made for fast idle on the first step after a cold start. Do not use this screw to adjust the normal idle speed.12. Choke pull-off diaphragm. Cracks the choke open slightly as soon as the engine starts. Under the small brass plug at the centre there is a grub screw that adjusts how much the choke is cracked open.13. Accelerator pump. Pumps fuel into the air stream, via the accelerator pump accumulator, during hard acceleration.14. Idle speed screw. Adjusts the idle speed. To be adjusted only after the engine has reached operating temperature, and the choke is fully open.15. Vacuum advance connection. Connects to the distributor vacuum advance diaphragm.16. Idle mixture screw. Adjusts the idle fuel/air mixture. Stock jetting for 3.3l and 4.1l Crossflow Weber 34adm carburettor- First stage Idle: 60 Second stage Idle: 70 Primary Fuel: 135 Secondary Fuel: 210 Primary Air: 160 Secondary Air: 160 The following jetting, apparently gives excellent throttle response, very smooth idling and excellent pickup on secondaries - (stock 3.3l Crossflow Motor) Primary Idle: 65 Secondary Idle: 75 Primary Fuel: 140 Secondary Fuel: 220 Primary Air: 160 Secondary Air: 180 DIS-ASSEMBLY AND REBUILD INFORMATION - https://oldschool.co.nz/index.php?/topic/75342-weber-34-adm-carb-conversion-info/ Weber 34ADM carburettors, have a 2 stage low speed jet solenoid. This was an emissions control system, which allowed the engine to run with one jet size when cold (70) and when the engine warmed up it switched to a smaller jet to reduce emissions (55). As the idle jet vacuum solenoid ages, the little diaphragm inside fails allowing - fuel to flow from the primary low speed circuit through the failed solenoid and into the line that supplies vacuum to the system. This causes the engine to run super rich. Products which can solve the problem can be found at the below links, comprising of a larger jet holder, which deletes the solenoid and the appropriate jets to go with it. You may need to mess around with the jets to find the right one for your engine https://www.weberperformance.com.au/product_info.php?cPath=6_268&products_id=631 https://www.weberperformance.com.au/product_info.php?cPath=6_268&products_id=1345 Here is a picture of the system on the standard carb and of another of the carb, with the idle jet solenoid system deleted. You will note all the vacuum ports except the vacuum advance are capped off, deleting the emissions control systems (EGR etc). This pic shows the throttle nudger, which is supposed to hold the throttle slightly open momentarily if the throttle is snapped shut suddenly to smooth things out. On some models it may also have been supplied vacuum as an idle up system for air con etc. The diaphragm can fail and cause a vacuum leak and most of the carb rebuild kits don't include this particular diaphragm. The vacuum port for the power valve is in an odd place on these carbs and some off the shelf adaptor plates will blank it off causing the engine to run on the power valve all the time and run very rich. The port is actually under the base plate and is not open to either of the carb barrels. If this port is omitted, vacuum will not be supplied to the power valve or the accelerator pump boost diaphragm and the carb simply wont work properly. If you look at the underside of the carb you will find the port (it might even be blocked with crud). The port is located between the primary and secondary bores and continues up through base and into a tube in the carb body. The tube also acts as a locating dowel and can sometimes become damaged and obstructed if the carb hasn't been assembled correctly at some stage in the past. Further useful info can be found here - http://www.mbs.id.au/tuning/Carburettors/Weber/34ADM.htm There are five springs in total fitted in this carb. By process of elimination you can work out several of them but some are interchangable and if fitted incorrectly will cause mixture problems. So keep the springs with their correct counterpart. Shown are the vacuum passages to the power valve diaphragm and the boost accelerator pump. When vacuum drops to a pre-determined level the power valve diaphragm is pushed into the power jet which opens the ball to allow more fuel into the main circuit. Also the loss of vacuum applies an extra amount of fuel to the accelerator pump circuit over and above what the accelerator pump diaphragm will deliver. This will usually occur when the second barrel is opened suddenly. The different spring length & tension will operate these devices at differing vacuum settings. The vacuum to the power valve & accelerator pump boost diaphragms is supplied through this tube. The vacuum port continues down through to the base of the carb between the primary and secondary bores. The tube also acts as a location dowel. It is long enough to pass through the thick gasket and into the base. Now what can happen is that if you don't line up the dowel perfectly to the base and you attempt to tighten the base screws then the tube can be pushed further into its bore in the body of the carb. The end result is a blocked vacuum passage. This will result in a rich cruise mixer and a hesitation when the second barrel opens suddenly. To check that the passage is unobstructed, place you mouth on the tube and suck or attach a tight hose and suck on it. It should feel easy to suck through. If not then this is what needs to be done. Remove the tube and the easiest way to do this is to stick a drill into the tube, then use a small pair of vice grips to grip it and twist it out. Cut a slot into the tube and then refit it back into the hole. Make sure the slot lines up with the vacuum passage and the tube protrudes through the thick gasket so it can line up with the base. The slot does not have to be as long as in the photo. If the tube is fitted at the correct depth, this mod would be unnecessary. REBUILD KIT LINKS - https://www.ebay.ca/itm/FORD-FALCON-WEBER-34-ADM-SERVICE-KIT/264174927546?epid=2102017418&hash=item3d820d7eba:g:kYYAAOSwFV9X1ukr https://www.ebay.com.au/itm/WEBER-34-ADM-CARBURETTOR-SERVICE-KIT-FORD-FALCON-3-3-4-1/201732658915?hash=item2ef83416e3:g:RbgAAOSwa~BYPWPJ https://www.meat-doria.com/en/product_meat/W552.1 https://www.meat-doria.com/en/product_meat/W552 Flow testing a stock 34adm carburettor 5 gerg, roKWiz, 351XD_Fairmont and 2 others reacted to this Share this post Link to post Share on other sites
351XD_Fairmont 604 Posted May 22, 2020 Great information here Dave, maybe this and other such technical articles like your btr one could be put in a restoration sub forum or a stickied thread for easy finding? Share this post Link to post Share on other sites
deankxf 20,288 Posted May 22, 2020 wouldn't mind seeing how the power valve itself comes out, one of mine here is stuck on.. making the engine flood. pretty sure it's pressed in and can't be removed(not without butchery) Share this post Link to post Share on other sites
The carby guy 1 Posted July 11, 2021 Excellent information. However I found those kits you list to be incomplete and poor quality. The pump plunger in those kits have a plastic end which can wear quickly or melt when fuel gets on them. Plus the intermediate gasket is just a paper gasket and does not work if your carby has already been overhauled in the past. You need the complete block gasket. There is no auxiliary diaphragm in those kits which is a must. Most of those kits do not have a choke pulloff and the kit that does is missing all the top plastic parts and spring. Those kits are also missing the large acd diaphragm. A better company to deal with is Partsdencom, they have the best kits around and as they are in Australia it only takes 1-3 days to get the parts you need. Minor kit: https://www.ebay.com.au/itm/223851328759 Major kit: https://www.ebay.com.au/itm/223132643529 Major kit with new filter screen: https://www.ebay.com.au/itm/202875656729 New replacement electric choke unit: https://www.ebay.com.au/itm/202106652566 Replacement nitrophyl float for the brass float, a must if you run your car on LPG: https://www.ebay.com.au/itm/202106654779 Thick base gasket: https://www.ebay.com.au/itm/192730586312 1 deankxf reacted to this Share this post Link to post Share on other sites
cisco 111 Posted August 4, 2021 On 7/11/2021 at 10:53 AM, The carby guy said: Excellent information. However I found those kits you list to be incomplete and poor quality. A better company to deal with is Partsdencom, they have the best kits around and as they are in Australia it only takes 1-3 days to get the parts you need. Major kit with new filter screen: https://www.ebay.com.au/itm/202875656729 Yes. Some of the cheaper kits miss most of what needs to be replaced. Also +1 for partsden. I used to get the "Fuel Miser" kits of which you would have a lot of extra parts that you did not need. Recently I have fitted the full kit from partsden and there is a marked improvement especially with cold start and idle. Overall I find the 34 ADM carburettor very satisfactory requiring minimal adjustments. Fitting a major kit every 5 years gives these engines a marked rejuvenation. Share this post Link to post Share on other sites
BDuck 14 Posted November 1, 2022 Sorry if this is the wrong thread, but I can't seem to navigate the search function to find my answer, and Google is proving difficult. This thread states that the 34adm is in the XE/XF. I have a 1979 XD 4.1 and would like to know what the factory fitted carby is. Cheers Share this post Link to post Share on other sites
deankxf 20,288 Posted November 1, 2022 2 minutes ago, BDuck said: Sorry if this is the wrong thread, but I can't seem to navigate the search function to find my answer, and Google is proving difficult. This thread states that the 34adm is in the XE/XF. I have a 1979 XD 4.1 and would like to know what the factory fitted carby is. Cheers stomberg single barrel,. if it looks like this https://www.ebay.com.au/itm/143667442469 Share this post Link to post Share on other sites
BDuck 14 Posted November 1, 2022 Thanks for the quick reply! I take it the upgrade path is not a straight swap like what's recommended in here? Share this post Link to post Share on other sites
deankxf 20,288 Posted November 1, 2022 18 minutes ago, BDuck said: Thanks for the quick reply! I take it the upgrade path is not a straight swap like what's recommended in here? most people who fit a bigger carby to the iron head (1979 XD) would get the XC/XD redline manifold and fit a 350 holley (could adapt it to a weber if preferred) if it was an XD 1981 with Alloy head, the XE/XF manifold fits, but it's a bit of a muck around to get working on an XD still, (throttle cable ball is different size, no choke output on the alternator, something else i can't remember) if it was mine, i'd keep it stock and find a carby kit if required. they drink a bit of petrol but i'd suspect it's not a daily driver doing heaps of kms, the stromberg is pretty reliable. Share this post Link to post Share on other sites
BDuck 14 Posted November 1, 2022 13 minutes ago, deankdx said: most people who fit a bigger carby to the iron head (1979 XD) would get the XC/XD redline manifold and fit a 350 holley (could adapt it to a weber if preferred) if it was an XD 1981 with Alloy head, the XE/XF manifold fits, but it's a bit of a muck around to get working on an XD still, (throttle cable ball is different size, no choke output on the alternator, something else i can't remember) if it was mine, i'd keep it stock and find a carby kit if required. they drink a bit of petrol but i'd suspect it's not a daily driver doing heaps of kms, the stromberg is pretty reliable. It's more out of interest of what I can do/if I can do it. Car is essentially single owner from factory considering it was my grandparents' car (still have the original registration cert and warranty/maintenance booklet) and yeah, car has just over 200,000kms so the stromberg definitely seems reliable. Thanks again 1 deankxf reacted to this Share this post Link to post Share on other sites
Nath 1,975 Posted May 5, 2023 Hey guys, Maybe someone can weigh in here. Trying to get a manual choke setup for a 34ADM, I found nothing in Aus but a shop in the UK has this which will fit a Weber 34ADF. My google fu says they're very similar and it looks to me like it would fit. Anyone happen to know if they might be the same? I'd imagine there's a good chance it would fit. https://classiccarbs.co.uk/product/weber-3236-dgav-38-dgas-carburettor-manual-choke-conversion-kit Share this post Link to post Share on other sites
Nath 1,975 Posted May 5, 2023 They've responded to my email, they don't have one to check but I've compared the measurements they've given for the kit below and it looks like it will bolt up at least. Diameter of the choke assembly thing is the same and the holes for the plate are the same. The inside of it looks similar as well with the fork part there. https://classiccarbs.co.uk/product/weber-dgav-dgev-dgv-dgas-dges-dgms-dfav-dft-manual-choke-conversion-kit It really seems to me like it should fit but nothing is ever that easy. Share this post Link to post Share on other sites
deankxf 20,288 Posted May 5, 2023 1 hour ago, Nath said: it really seems to me like it should fit but nothing is ever that easy. did you try this mob in Melbourne, they know what a falcon 34ADM is https://www.weberperformance.com.au/ Share this post Link to post Share on other sites
Nath 1,975 Posted May 5, 2023 2 hours ago, deankxf said: did you try this mob in Melbourne, they know what a falcon 34ADM is https://www.weberperformance.com.au/ Yeah tried them, no clue 2 SPArKy_Dave and deankxf reacted to this Share this post Link to post Share on other sites
SPArKy_Dave 8,872 Posted May 6, 2023 On 5/5/2023 at 12:53 PM, deankxf said: did you try this mob in Melbourne, they know what a falcon 34ADM is https://www.weberperformance.com.au/ On 5/5/2023 at 3:43 PM, Nath said: Yeah tried them, no clue They've probably forgotten what a 34ADM even is... I've encountered this before, with other 'old school' automotive things. Similar to how most wheel alignment places, have forgotten how to align x-series. Share this post Link to post Share on other sites
deankxf 20,288 Posted May 7, 2023 9 hours ago, SPArKy_Dave said: They've probably forgotten what a 34ADM even is... I've encountered this before, with other 'old school' automotive things. Similar to how most wheel alignment places, have forgotten how to align x-series. the people that know anything were likely 30-40yrs old when i got mine, that was 30yrs ago so they are likely retired or turned into managers/desk workers. biggest reason i went to Pedders instead of "other aligners" is they check to see if the suspension is worn before doing one. (got an alignment from Bob Jane about 20yrs ago and it chewed tyres like it was going out of style, took it to pedders, LOOK HOW WORN THE IDLER ARM and TIE Rod is, no hope of aligning that. ) Carby expert i dealt with last was still working at age 67 but passed away probably age 68 ish(was only working part time 3 days a week) 1 SPArKy_Dave reacted to this Share this post Link to post Share on other sites
Nath 1,975 Posted May 9, 2023 Update on this: The place in the UK emailed me back, DGV manual choke setup won't work as the locking ring is a different shape so the holes won't line up, their locking ring what the choke cable connects to so it's necessary. The element connection is also different, Weber has a tongue while DGV has a pin that attaches to the mechanism. So as far as I can tell there's no manual choke setup for the 34ADM available. 1 deankxf reacted to this Share this post Link to post Share on other sites
SPArKy_Dave 8,872 Posted May 10, 2023 On 5/7/2023 at 10:54 AM, deankxf said: LOOK HOW WORN THE IDLER ARM and TIE Rod is, no hope of aligning that. ) Carby expert i dealt with last was still working at age 67 but passed away probably age 68 ish(was only working part time 3 days a week) The last x-series alignment I had done, was after hrs, by an old school mechanic I'd done some electrical work for. First thing he did, was check that stuff, and found I needed new upper ball joints. A few yrs ago, I bought an injector reco/test flow bench machine from a carby guru in Seaford. He looked about that age - semi-retired, as he said he'd recently become ill with the big C. Exposure to fuel or cleaning chemicals maybe? My retired mechanic uncle, died a very similar way a few yrs ago - often called mechanics disease apparently. Share this post Link to post Share on other sites