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Check vacuum w123. Kent set out to find a way to repair them only to .


  • Check vacuum w123. 00. The time now is 06:41 PM. B1. Unfortunately, the replacement part The door locks on many W123 Mercedes Benz are locked and unlocked using vacuum produced by the vacuum pump on the engine. Oct 17, 2006 · Both the central locking and climate control vacuum lines start from the yellow check valve in the engine bay. Has vacuum leak in climat control system. link to check valve http://amzn. 8T 3. New OEM Mercedes Check Valve for the Single Port Vacuum Pump. From its distinction from the W124, reliability insights, and detailed maintenance guides, to FAQs and best products for upkeep. If it's the same with the coupe system, the yellow-red one is for the gas flap, and you can trace it from there. I hammered on the little 3 prong metal retainer that holds the spring and plastic valve in place & popped it back into place then reinstalled it. But these stickers do come off and you are stuck with finding the right information online or in a manual. Commonly these leak air leading to issues such as inoperative central locking or other vacuum related issues. This design is inherently more Oct 8, 2025 · Find many great new & used options and get the best deals for Mercedes W123 Vacuum Power Check Valve Genuine A1238000078 at the best online prices at eBay! Free shipping for many products! mercedessource Tech help - When troubleshooting your vacuum system you must know where the hoses and lines go On many diesels the diagram was on a sticker mounted on the front core support of the engine as you see in this picture for a 1980 300SD. These diagrams may or may not help. Apr 11, 2011 · The vacuum pump check valve on top of the vacuum pump itself failed. Fits all OM617 Turbo-Diesel Models except the 1978-1979 W116 300SD. Or the push rod of the main brake cylinder is incorrectly adjusted, and the vacuum booster is applying slight pressure on it. Find many great new & used options and get the best deals for Genuine OEM MERCEDES W123 230 240d Vacuum Power Check Valve 1238000078 at the best online prices at eBay! Free shipping for many products! Used, tested check valve for Mercedes vacuum pump for om616 and om617 engines found on w123 chassis 240D 300D 300CD 300TD and w116 and w126 chassis 300SD diesel and turbodiesel vehicles. No brake assist, no climate controls and no engine shutoff. The main "moving part" is a set of rubber diaphragms that, with age, get brittle and 4 days ago · Mercedes W123 230 240D Vacuum Power Check Valve 1238000078 Genuine New OEM Part. But I got lucky here and had all the locks all working in under 2 Feb 2, 2012 · at the risk of sounding like an idiot (how else am i going to learn?), i would like to ask you guys about tracking down vacuum leaks in the w123. Aug 30, 2025 · Mercedes W123 Vacuum Power Check Valve Genuine A1238000078 A AutoBeta USA (29854) Jan 19, 2017 · Do you have the run on problem when everything is unlocked/locked? The way that the actuator pods work in the 80s w123 are that they require vacuum to lock and unlock. 1 transmission shifts earlier on the USA models as you can see: W123 W126 Vacuum Check Valve for Vacuum Door Locks ( (yellow) When this check valve fails your door locks will not hold and the vacuum may leak off. May Qualify For FREE SHIPPING. In very good working condition, tested & proven functional. This guide will walk you through diagnosis of the vacuum door lock system on an early style W123 with the four diaphragm door lock vacuum actuators. I found lots of great threads but need to know whether I should rebuild my vacuum pump or just replace the check valve. Sep 9, 2025 · Genuine Mercedes W123 230 240D Vacuum Power Check Valve 1238000078 Mar 19, 2022 · Buy Vacuum Power Check Valve For W123: Vacuum Valves - Amazon. Using an 8mm wrench or small vice grip (depending on model of vacuum regulator) turn nut in I have heard that by blocking one of the vacuum lines on the 3 way check valve under the hood, I can disconnect the central locking from the vacuum system and preserve the ability to turn off the car with the key. at the best online prices at eBay! Free shipping for many products! May 18, 2025 · 77-80 (W116) 300SD 81-85 (W126) 300SD. Then make sure all the rubber 3 way and 4 way connectors under the hood are in good shape still Oct 6, 2015 · Hello fellow W123 owners, I am presently experiencing problems with the vacuum system on my 1982 240D (4-speed manual). Original OE Mercedes part. Using an 8mm wrench or small vice grip (depending on model of vacuum regulator) turn nut in approximately 2˚ increments checking your vacuum reading. Instead of a rubber diaphragm pumping action, they designed a piston with a 0-ring seal to replace the diaphragm. Packaging should be the same as what is found in a retail store, unless the item was packaged by the manufacturer in non-retail packaging, such as an unprinted box or plastic bag. Let me start back to the beginning. Condition: As pictured, new in the original packaging. I disconnected the line and I felt no vacuum from the pump. If your vacuum pump ain’t sucking properly, check the check valve first before you suspect the pump itself. 2 07C133529A Fixing the vacuum door locks on my W123 240D proved to be pretty easy. Aug 2, 2020 · Top 10 Mercedes Vacuum Check Valve W123: BoCID Air Pump Vacuum Check Valve For VW Passat AUDI A4 A6 Quattro 1. Apr 22, 2004 · Several months ago I bought a 1982 300D turbo (W123). Oct 7, 2025 · Sell now Mercedes OEM W123 230 240D Vacuum Power Check Valve 1238000078 E EuroJamboCombo (3561) Genuine Mercedes Ignition Steering Lock Vacuum Valve Diesel W123 W126 Wvo Diesel Let's take the vacuum pump check valve off and see if we can get it to work. May 27, 2020 · Pull the plastic bullet shaped dust cover cap off the side of the vacuum regulator. The time now is 07:04 PM. Other times it can be a Sep 12, 2023 · Dive deep into the intricacies of the Mercedes W123. See the seller's listing for full details. I want to reconnect it after replacing my fuel door actuator (went through and checked the system for Jun 26, 2018 · Hello everyone, I've finally lost my w123 forum virginity over this issue I can't seem to fix. How to adjust the vavle: The vcv is bolted to the injection pump, and the modulator is attached to the transmission. Does anyone know which line I need to block off in order to disconnect central locking from the vacuum system? Jul 28, 2021 · In the manual it has that the Check valve is there in case there is a loss of vacuum from the pump or suppose a leak in front of the check valve. The valve attaches to a shut off lever in the injector pump and when activated cuts off the supply of fuel. Aug 24, 2025 · Find many great new & used options and get the best deals for Genuine Mercedes Vacuum Pump Check Valve NOS W123 W1116 W126 Diesel OM616 OM617 at the best online prices at eBay! Free shipping for many products! Let's replace the external vacuum pump check valve. Jan 16, 2019 · If you are reading the vacuum from the main hose and its the gauge needle its jumping, Take the main check valve out (in top of pump), spray it with WD40 or PB Blaster, blow it, clean it. mercedessource Product - FITS THE FOLLOWING: ALL 123 and 126 chassis 240D, 300D, 300TD, 300CD, and 300SD 1980 to 1985 with later style vacuum pump (only one line coming out of top). Jun 26, 2006 · Here is a step-by-step diagnostic that I prepared after fixing a vacuum leak in my own car (W123 230E 84). Sep 30, 2025 · Sell now Genuine Mercedes W123 230 240D Vacuum Power Check Valve 1238000078 K King's Automotive Parts (4532) Sharing my experience with vacuum system which could be challenging and/or very costly to diagnose or repair. One common item that leaks is the vacuum operated lock actuators. This is a split one way check valve with one inlet and two outlets. Sometimes everything vacuum powered works great, but oftentimes everything but Aug 24, 2024 · The door locks on many W123 Mercedes Benz are locked and unlocked using vacuum produced by the vacuum pump on the engine. Leaks in the door lock system can cause the door locks to operate poorly. Feb 8, 2013 · So a little vacuum is being lost from one pipe or another . You want to see 18+ Hg of vacuum. Does it work? Does it explode?? Jun 15, 2016 · Does anyone have or know where to find a diagram (or diagrams) of the whole vacuum system in a 1982 300D? I've got a couple different emission systems Nov 26, 2022 · W123 300D Auto Climate Vacuum Restrictors and Check Valve LinkBack Thread Tools Display Modes Bookmarks Digg del. If it is not working properly you will never get your automatic transmission to Oct 14, 2006 · Well bad news, my vacuum pump died. Parts# 126 800 00 78 126-800-00-78 126. We Dec 16, 2013 · Door locks slow or dead? The first step, before pulling/fixing parts or buying potentially expensive replacements, is to diagnose the system. This is the one-port style used mostly in later-model OM617 Turbo Diesel engines. You can save hundreds $$$ by doing it yourself. If yours is starting to act up, make sure you check the rubber elbows that enter the amplifier before replacing it as the amplifier very rarely fails but the vacuum lines do dry out, degrade and fail over time. Use the forum search at top of the page and in it put - 85 300d w123 vacuum ?s with video . I've begun to notice that the engine doesn't quite shut off with the same authority. to/2ykuXYe …more Jul 23, 2025 · Find many great new & used options and get the best deals for Mercedes W123 Vacuum Power Check Valve Genuine A1238000078 at the best online prices at eBay! Free shipping for many products! Mar 30, 2017 · All times are GMT -4. 800. In 1980, Mercedes changed the design of its diesel vacuum pumps. Learn the steps with this DIY guide: W123 vacuum lock system diagnosis guide Jul 12, 2011 · On vacuum-only models it can be used to check the vacuum system: too much vacuum means early shifts; late shifts means not enough vacuum. The time now is 11:44 PM. Call (310)626-8765. Start by testing the main vacuum feed from the large line running out of the pump. 50 Quick View Dec 7, 2013 · Originally Posted by brandonbunn Whoops! Sorry about that. . Anyway, reattached the check valve and start by turning car off in locked position after it has built up enough vacuum. us StumbleUpon Google Genuine Mercedes Vacuum Check Valve for Climate Control InStock Ships Today! $47. P/n's are: 0005861723 Oct 20, 2020 · My 83’ 300d has developed a funky problem with intermittent low vacuum. I have attached 2 diagrams which make sense but they seem to contradict each other. How to fix or how can I get a real factory manual. In Dec 21, 2009 · I swapped engines in my 300d, and unfortunately didnt document the vacuum line connections. This check valve can fail or get gunked up and give similar symptoms as a bad pump. It turned out to be a failing locking unit for the fuel filler cover in my case. The 722. Check by blowing and then sucking on the check valve. Good used check valve. I was wondering what this Apr 13, 2008 · Warm up regulator (WUR) Calibration / Control pressure calibration or adjustment How to calibrate the k-jetronic warm up regulator Applies to: Most K-jetronic mercedes engines, the type without electronic lambda controls. This includes the 1978 to 1985 300SD, the 1980 to 1985 W123 300D, 300CD and 300TD and the 1980 to 1983 240D. Figure 4 Now is a really good time to clean up any spilled fluid, dirt and debris under the booster (red arrow). I used a vacuum pump tester and circled the line that wasnt holding vacuum. If you lead the line from under the hood and through the window, you can check the vacuum during driving conditions. Dec 23, 2009 · NOTE - Updated Notes - The 5th POST on this THREAD is where to go in order to download my fancy W123 Vacuum Door-Lock Diagram in living color : http:// For all Mercedes-Benz modes with vacuum door locks. 1 on the plug) at idle and controlled vacuum from the vcv. If I use the vacuum shutoff diagram it shuts off with the key but it takes about 10 seconds. That is not always the case with vacuum door lock systems. Sometimes it is just a leaking actuator. It will explain how they operate and how to test them with a vacuum hand pump tester. I feel like air somehow gets into the vacuum booster, causing it to slightly press on the main brake cylinder. Any part of the vacuum system that is failing can and will cause disruption to the transmissions ability to shift properly Dec 5, 2013 · Does anyone know if the check valves in the two vacuum pump rebuild kits, the one for pre 80 and 80-85, are the same ? I ask because I need the a check valve for the oil drain tube and the vacuum kit the later MB's has is alot more then the earlier MB's kit. W123 Transmission Vacuum Diagram & Shift Issues If your W123 diesel has shift issues, there is a very good chance that the transmission is just fine. You might have a rip in either direction on one of the pods. Discover everything you need to know about this classic car. Diesel Vacuum Pump Check Valve. Then try it again later in the unlocked Aug 30, 2025 · Part # 004 997 18 72 is a new old stock GENUINE OEM MERCEDES BENZ vacuum pump check valve for some diesel model of the 126, 123, and 116 chassis. Why do we have to trash malfunctioning WURs? Why do we have to pay PicClick Insights - Genuine Mercedes W123 230 240D Vacuum Power Check Valve 1238000078 PicClick Exclusive Popularity - 22 watchers, 0. If not working properly vacuum can leak out of the system after you shut the engine off. I have all of the Monkey Wrench Mike has built a smoke machine for about $20 to try and find vacuum leaks in his 1990 Mercedes 560SEC. 77-85 (W123) 240D 300CD 300D 300TD. Fits W116 ,W123 ,W126 Chassis OEM Mercedes Used Vacuum Pump for OM617 Turbo Diesel Engines. Have a 1988 mercedes 560sl. Jul 17, 2025 · Find many great new & used options and get the best deals for Genuine Mercedes Benz W123 230 240D Vacuum Power Check Valve 1238000078 at the best online prices at eBay! Free shipping for many products! Sep 26, 2011 · You can check the vacuum going to the transmission from the transducer with a Y-connector and a long vacuum line and a gauge. The last photo shows a common example of how it's installed in a W123 300D vehicle. Possibly, the valve that lets the air out isn't working properly. Air should only pass one way. This valve is found on 1978 to 1985 5 cylinder turbo engines and on the 1980 to 1983 non-turbo engines. Check part numbers carefully to verify compatibility. May be found in some Naturally Aspirated Engines. This tester is essential if you are going to attempt to fix your door locks on your own. We've gathered a vast collection of useful articles to help you perform many repairs and upgrades on your Mercedes-Benz. Check out Kent's YouTube video. 78 1268000078. icio. May 28, 2020 · Is there a way to test out this W123 vacuum control valve (VCV) while it is out of the car? I have this one and I would like to know if it works Aug 30, 2022 · Awesome news Uro! Thanks!All times are GMT -4. PicClick Insights - Mercedes W123 vacuum check valve 1238000278 PicClick Exclusive Popularity - 3 watchers, 0. Mercedes Various models vacuum check valve No: - 123 800 00 78, 1238000078 $27. I've taken care of a host of minor problems but got stumped on the vacuum pump. There are several things to check, and most of them are vacuum related. Kent set out to find a way to repair them only to Apr 11, 2018 · When diagnosing leaks in the Mercedes vacuum system, a vacuum pump with gauge is mandatory or should you have a smoke machine on hand, that would be the ultimate way to go. Fits the one-port style used mostly in later-model OM617 Turbo Diesel engines For W116 ,W123 ,W126 Chassis Please verify fitment in the Vehicle Interchange tab before purchasing. 0 new watchers per day, 2,796 days for sale on eBay. Apr 26, 2025 · The W123 diesel motors are shut off by discontinuing the flow of fuel from the pump and this is controlled by a vacuum injector pump shut off valve. You could start by removing this check valve to inspect it, clean it, and see if that helps. Jan 18, 2024 · Replace your own vacuum pump with these step by step instructions! I'm also making vacuum diagrams, and plotting to touch every single component in the vacuum system, which spans from central locking, hvac, transmission control, emissions, brakes, and even This check valve helps to hold vacuum in your door lock system. Hoping to find someone that's rebuilt both an early and late model pump and knows if there's a difference or not. Any ideas on how can I fix that? Find many great new & used options and get the best deals for MERCEDES W123 Vacuum Check Valve 1238000278 at the best online prices at eBay! Free shipping for many products! Does the external check valve on the vacuum pump go back often? How do we know if it is the valve or the pump? Nov 11, 2013 · Vacuum system diagnosis is not difficult, just time consuming. About a year ago my doors stopped working and my engine wouldn't shut off, i replaced some rubber fittings and the vacuum line running from the vacuum pump to the I guess I just gave away where the leak was! I've got some good tips for finding a vacuum leak on your classic Mercedes though, a simple process with inexpensive tools to narrow down what is Find many great new & used options and get the best deals for Mercedes W123 Vacuum Power Check Valve Genuine A1238000078 at the best online prices at eBay! Free shipping for many products! Jul 10, 2022 · So I have an '82 240d with about 370k miles on the odometer. Jun 1, 2025 · This O-ring creates the vacuum seal between the master and booster. Let me run Apr 21, 2020 · I’ve been trying to diagnosis where the vacuum leak in my 240D is because the door locks aren’t working, the engine won’t shut off and I feel like the transmission is shifting rough from it. I have front door panel removal videos for both the W116 and W123 available--just check my playlists. Jan 19, 2015 · I have a pretty simple question for my fellow W123 owners. Mar 2, 2009 · Hi guys & gals, I spent most of yesterday outside tracing vacuum leaks and on the computer researching "how to's" on vacuum system diagnosis. Figure 3 To remove master from the booster use a 13mm wrench and remove the two nuts (red arrows) and slide the master forward and off the booster. That bit of tubing between the check valve and the power brake booster is supposed to act as a resistor and give you a tiny bit of warning if the is the mentioned vacuum loss. Jan 25, 2025 · When the master vacuum switch on your door lock system begins to leak it can prevent the lock side, the unlock side, or even both sides from Kent will explain the theory of operation in simple terms, why it is so important for proper transmission shifting performance, and how to test it hooked up to the engine's vacuum system with the engine running. This check valve helps to hold vacuum in your door lock system. Save money by doing your own work and perform the repairs using the information we've provided here. --- -- the video wont work but check info vacuum the same for tutbo The VCV valve controls the critical shifting patterns of most diesel automatic transmissions from 1978 to 1985. 1985 300 Turbo D - Sedan Federal model - Built 10/84 (per door) Yellow Check Valve has Welcome to our Mercedes-Benz W123 Technical Articles section. However, the technique applies to later models as well; the actuators work the same despite looking different. 02. Then test to make sure the tank in back is holding air because if not it makes testing everything else more difficult. com FREE DELIVERY possible on eligible purchases Doors won't lock or unlock. No longer available new from Mercedes-Benz. It could be a failed door lock actuator. You need to check the amount of vacuum the unit is allowing through, as supplied by your pump. All of the vacuum locking Oct 7, 2025 · Sell now Mercedes W123 Vacuum Power Check Valve Genuine A1238000078 G globalspareparts (10649) Oct 7, 2025 · Find many great new & used options and get the best deals for Mercedes W123 Vacuum Power Check Valve Genuine A1238000078 at the best online prices at eBay! Free shipping for many products! Aug 22, 2025 · 77-85 Mercedes 300D 300Td 300Cd W123 Vacuum Pressure Converter Valve 1233001133 Find many great new & used options and get the best deals for MERCEDES-BENZ W126 W123 OEM VACUUM CHECK VALVE - 1268000078 at the best online prices at eBay! Free shipping for many products! May 2, 2016 · Also note that on the piston pumps there is a check valve on the pump, between the pump and the main vacuum line. A rebuilt pump runs $250 and probably 2 hours or more of labor and I can't drop $500 right now so I am planning on rebuilding the pump Oct 7, 2025 · A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is applicable). the W123 Vacuum Control Valve. 0 new watchers per day, 112 days for sale on eBay. Feb 5, 2005 · Here are some vacuum diagrams to help you diagnose your W123, W124 or W126 diesels. May 23, 2025 · These were used in all types of vehicles from the 60s through to the 90s. If you find this content useful, please Jul 28, 2021 · Hello, I have a 1983 300d with a broken check valve on the main vac line running from the vac pump to the booster. Leaks in the door lock Aug 26, 2025 · Find many great new & used options and get the best deals for Mercedes OEM W123 230 240D Vacuum Check Valve 1238000078, read notes. These are no longer available new and most of the used ones you may try to purchase are not working properly or worn out. My car was purchased in March of 2013 (207K miles), since then I had driven approximately 13,000 miles with no issues with the vacuum system. I'm fixing up my central locking system, and it looks like the previous owner capped the yellow check valve in the engine bay. Mar 11, 2021 · I’m fairly sure my vacuum system on both of my cars has been tampered with extensively, so I’m having to piece this together from looking at other diagrams and chasing hoses to try to determine how it was meant to be. Feel free to direct message me for anymore information. Here's what's happening: Two Feb 2, 2017 · Parts to check: Vacuum pump, vacuum tank, main line from pump to booster, 3/2 way valve, all check valves, all vacuum modulators, door, trunk, fuel locking mechanisms, all rubber connectors, VCV valve, transmission modulator, fuel shut-off valve, and the ignition switch vacuum lines or vacuum unit itself. The 240D diagrams were looked up for a 83 year model, but should Jun 1, 2012 · All times are GMT -4. Can't find what you're looking for? Try our Search Engine at the top of the page, or hop over to one of our Brakes auto parts for Mercedes-Benz 230/240/280/300 (1977-1985) W123: Brake Boosters and Parts and other parts related to Brake Master Cylinders and Boosters Feb 27, 2025 · The vacuum amplifier modulates the vacuum and boost signal to control the vacuum feed to the transmission. 3ms 9aw4gy blqrgk4u 87vy 6pod 0xfq qln r08 2ugtyqbps 0tyv

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