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#1
01-05-2008, 05:12 PM
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Vacuum pump check valves
I just got my vacuum pump off and mostly rebuilt.... Looks like one of the check valves actually sort of "ruptured" and there were parts of it on the inside top (away from the block) of the pump. Also, a spring was stuck in one of the still good check valves.
The reason I am posting though, is that there is a 4th valve that wasn't included in the kit, and a lot of extra parts. in the threaded connector on the pump (where it connects to the pipe) there was another check valve which was not functioning. I went ahead and pulled it out, and tested the pump by blowing into the threaded part. It does let me blow air, and it holds a seal. Do I need to worry about this 4th check valve? Here is what's left of the check valve that goes in the fitting http://i102.photobucket.com/albums/m112/EvenYourMomHatesYou/102_2929.jpg For fun here is the picture of the check valve that broke the camel's back http://i102.photobucket.com/albums/m112/EvenYourMomHatesYou/102_2931.jpg Also, here is a picture of the spare parts. I assume they are just for other models of pumps... http://i102.photobucket.com/albums/m112/EvenYourMomHatesYou/102_2932.jpg The flat seal is the one I would have used, but mine looked and felt like metal, and I couldn't figure out how I would get it off, so I left it. I am not sure if the o-ring might go underneath that or what. and the hollow threaded thing... I have no clue. Please advise before I throw this thing back on the car! John
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1985 MB 300D/T Fell off the WVO bandwagon when people started trying to charge $2.50 a gallon for dirty vegetable oil. 
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#2
01-05-2008, 05:38 PM
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The "sleeve" is for the piston; the o-ring goes under the sleeve.
The check valve in the brass-looking nipple is there to prevent residual vacuum (when the pump is off) from pulling crankcase oil into the vacuum system.
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#3
01-05-2008, 06:15 PM
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Quote:
__________________
1985 MB 300D/T Fell off the WVO bandwagon when people started trying to charge $2.50 a gallon for dirty vegetable oil.
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#4
01-05-2008, 06:19 PM
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#5
01-05-2008, 06:20 PM
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unfortunately the link isn't working, could you give me a part number?
__________________
1985 MB 300D/T Fell off the WVO bandwagon when people started trying to charge $2.50 a gallon for dirty vegetable oil.
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#6
01-05-2008, 06:23 PM
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Worldpac part # is D3012-25391.
MB # is 0049971872.
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#7
01-05-2008, 06:26 PM
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wow, I found it with the part number, 35 bucks for a piece of brass, seems a shame, I guess I had better make a full order while I am ordering.... time to shop
__________________
1985 MB 300D/T Fell off the WVO bandwagon when people started trying to charge $2.50 a gallon for dirty vegetable oil.
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