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Getting back the missing vacuum 83 300SD - valves in the pump
I still had low vacuum after replacing the one-way metal vacuum valve
screwed in to the vacuum pump on the 83 300SD. I went after the debris from the previous one way valve that was open straight through, that I thought must be there. (there was no debris ever found - do not think there ever was any parts in the connector). Learned a little. Will try and explain it. Did not bring pictures for exhibits. But may add some later. I fished for the parts through the opening where the one-way valve is removed from the pump. This produced nothing. So on to removing the pump front cover. The vacuum pump front cover can be a real mess to get off for most people because the screws are often rotted / seized and they have standard or slotted heads. (I like the idea of replacing them with allen heads. Because my car has been a California dry desert car its whole life, the screws were able to come out without damage. So here is where it gets good and could answer a lot about where the missing vacuum goes. There are three valves behind the vacuum pump cover, they appear identical to me. They are positioned like this: 1 2 3 1 is the valve that pulls vacuum and leads to the brake booster. 2 and 3 are the exit valves that expel air on the up stroke and need to hold closed on the stroke that creates vacuum. In my case valve 2 was disintegrated and not doing its job. In my opinion 2 and 3 must work for vacuum to work. My next junk yard run will be me taking these out of the vacuum pumps as spares. I removed the debris and small spring from the broken valve. Using the remaining frame and put in position of valve 1. Valve 1 was good so moved it to 2. Keep in mind and watch carefully as valve 1 faces one direction poking out of the pump and 2 and 3 are the opposite way and flush with the pump. (sorry for no pictures). So at this point I have valves 2 and 3 intact and working, valve 1 not working. But because the one way screw in valve is there, and works, this makes up for valve one having no guts. After I put the front cover back on the pump (quite a challenge when on the engine and vertical instead of on a bench laying flat). All vacuum returned and brakes work and car shuts off. I was almost ready to purchase a new vacuum pump. Now I might just get a repair kit instead. For sure I will start collecting these little valves from the junkyard. Hope this post helps someone else who is missing vacuum.
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80 300D 340K Owned 30 yrs 83 300SD 440K Owned 9 yrs - Daily Driver 150mi/day 02 Z71 Suburban 117,000 15 Toyota Prius 2600 miles 00 Harley Sportster 24k 09 Yamaha R6 03 Ninja 250 |
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I had not read this for about 2 years now but back in 2007-2010 some Members had said that when the installed the Repair Kit with the Valve there Pump still did not hold Vacuum.
The dissembled the V Pumps again thinking they had installed a Valve in the wrong direction but it turned out the New O-rings in the Kit were not fat enough to seal. No one has said that has happened to them for a long time now so I don't know if that is still an issue with the Kits or not.
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84 300D, 82 Volvo 244Gl Diesel |
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