B4 96 Passat Vacuum Pump

Croghanite · Mar 3, 2012

Just got thru changing out the seal to my oil cooler and It seems the vacumm pump above it to the right is leaking oil as well.

Bently only shows one o ring where is meets the crankcase. Do y'all think thats the culprit?

Anything I need to know before I pull it off?

Croghanite · Mar 3, 2012

http://www.partsplaceinc.com/uploads/images/products/large/16432f.jpg

It looks like it's leaking from the top and not from where it meets the crankcase...

TonyJetta · Mar 5, 2012

In the 4 years I've owned my Passat, I think I have only heard of ONE failed vacuum pump.

How many miles on this engine/car? I don't know if the vacuum pump internal seals/parts are available. I'll take a look, later today.

Tony

Croghanite · Mar 5, 2012

270k miles

TonyJetta · Mar 6, 2012

According to vagcat.com, there is a seal in the top of the vacuum pump that can be replaced: N90415901 1stvwparts.com lists the seal for <$2 You may be able to source it from your local dealer for a similar price.

Tony

Croghanite · Mar 6, 2012

thanks man!

No one else has had a leaky vacuum pump?

4x4toy · Mar 6, 2012

I also had an oil leak from my vacuum pump a few years ago. Replaced the o-ring under the top "lid". No problems since. Cheap easy repair.

paramedick · Mar 6, 2012

4x4toy said:
I also had an oil leak from my vacuum pump a few years ago. Replaced the o-ring under the top "lid". No problems since. Cheap easy repair.

Ditto

cumminsfromthecold · Apr 5, 2014

Re. 1Z TDI Vacuum Pump & Oil Leak

Thanks guys. I didn't replace that seal when I did the swap - just left it intact. I thought I lost my rear main crankshaft seal the way it leaked all of a sudden. But now, upon eyeballing the leak source, it looks like it may be a slightly easier fix. Vacuum remains ok, thankfully. Perhaps just the vacuum pump top seal under the "lid" - PN N90415901. Thanks Tonyjetta! $3.49 works.

Hope I don't need a new one! $259! http://www.partsplaceinc.com/produc...ord=VW++TDI+Vacuum+Pump+028-145-101&sku=16432

tdidieselbobny · Apr 6, 2014

Is this a simple take the bolts out,lift cover off,replace o-ring and bolt it back up? Nothing will fly out when you take cover off,or nothing that is vacuum related will get messed up? Mine seems to be leaking oil,but I believe I bought an o-ring a while back-just need to find it

....

Digital Corpus · Apr 6, 2014

The difficult part is the angle of the bolts. No springs or complications to worry about.

Windex · Apr 7, 2014

Mine was leaking a little while back at the pump-to-block o-ring. I replaced it and the top cover seal at the same time. Took maybe 15 minutes.

Abacus · Apr 7, 2014

Same with mine.

cumminsfromthecold · Apr 7, 2014

Re. 1Z TDI vacuum pump top cap & pump-to-block o-rings

Cool. I have the o-ring for the top cap coming - might as well get the pump-to-block o-ring, too. Anyone recall that name or part number?

cumminsfromthecold · Apr 7, 2014

http://www.idparts.com/catalog/product_info.php?cPath=29_71&products_id=2395&osCsid=cf8ecceafdf2802bee817c195d5458c0

tdidieselbobny · Apr 20, 2014

Changed mine out last night. The old o-ring came out in pieces as I was trying to remove it. 1/4" drive,long extension,short 10mm socket and swivel connection to remove 3 bolts.I found that the 2 closest to engine-loosen them,then get one of those little grabber things w/claws that come out to retrieve things in tight spaces work great for taking out/starting the bolts back in those 2 rear holes.Next time I order from IDParts I'll get one of the bottom seals.

0die · Apr 22, 2014

try AZ Autohaus...I bought vac pump rebuild kits for my old MK1 diesels...easy and super cheap.

TDI Jim · Dec 17, 2017

How do you get the vacuum pump out to replace the bottom O-ring VW# N 904 146 01? I tried pulling mine up after removing the yoke bolt and clamp with no success last night. I have an oil leak at the bottom of it and assume it is the bottom O--ring or is there another seal in there that should be replaced after 21 years on the job? Thanks!

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turbodieseldyke · Dec 17, 2017

Maybe twist it back & forth, and pry it up a little? It's been a while since I did my oring, so its not fresh in my memory.

Steve Addy · Dec 17, 2017

You'll have to pry it out. Undoubtedly the old o-ring is rock hard so now it's actually helping to keep the vac pump in place.

Steve

TDI Jim · Dec 17, 2017

Thanks guys, will get on it now

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ToddA1 · Dec 17, 2017

There should be 2 o-rings and an oil seal in the shaft.

-Todd

TDI Jim · Dec 17, 2017

I replaced the upper and lower o-rings as that is all I had. Thanks for the encouragement to pull it up, as it pays to defer to prior experience with older cars!

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TDI Jim · Dec 17, 2017

TDI Jim said:
I replaced the upper and lower o-rings as that is all I had. Thanks for the encouragement to pull it up, as it pays to defer to prior experience with older cars!

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The lower o-ring in the pic is the new one, thanks for the help and will see how it works after getting the turbo intake back together after intake manifold cleaning.

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B4 96 Passat Vacuum Pump

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