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Old September 21st, 2010, 18:25   #1
mannytranny
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Default ALH leaking vacuum pump

I've had an annoying oil leak from my vacuum pump for quite a while now. I bought a new seal for the part that mates the pump to the head but that didn't fix it. I yanked it and put some FIPG along with the seal, still no luck. But this time I saw that it was actually leaking at the next seal over which separates the two pieces of the vacuum pump itself.

So I removed the pump and took apart the three torx bits tat hold the two parts of the pump together. Voila, another oil seal. This is the one that is leaking. So, new Toyota FIPG and reseal. I see no reason why this wouldn't fix the problem.

So, just in case anyone else is wondering why their vacuum pump leaks oil (which also may appear to be a head gasket, rear main or valve cover gasket), there is a secondary seal that may very well be the issue.

Happy TDIing!
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Old September 21st, 2010, 21:39   #2
runonbeer
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90% of ALH cars that I see have some degree of oil leak at this location.

What is "Toyota FIPG"?

I believe that LUK manufactures these pumps (as well as the tandem PD pumps). I just spent about 10minutes trying to find contact info for LUK to inquire about the possible availability of this seal and was not successful.
Anybody else wanna give it a shot? I'm not exactly a whiz at googling for corporate info on my iPhone. I think Jim from dieselgeek already made an inquiry about the internal PD tandem pump seals and they told him to take a hike.
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Old September 21st, 2010, 23:06   #3
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Quote:
Originally Posted by LUK USA website
Vacuum pumps are safety-relevant components in the vehicle. For this reason, it is not possible to repair the vacuum pump. Before assembling the vacuum pump and drive (on the engine side), check for wear. Carefully clean the sealing flange on the engine and the vacuum pump. The seal should always be replaced.
Weak.

http://www.lukclutch.com/content.sch...jsp?id=3346449

The pumps are mfd by LUK, part of the Schaeffler group.

Toyota FIPG is just the form in place gasket (RTV) sealant.
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Old September 22nd, 2010, 06:35   #4
mannytranny
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Ya...the Form In Place Gasket works great...I just put in the original O ring and then add the FIPG around the gasket. I just can't see any reason to throw away the whole pump when it is leaking just because of an old o ring.
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Old September 22nd, 2010, 09:10   #5
runonbeer
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So they make great DMFlywheels and lousy, leaky vacuum pumps.

Guess I'll go down and fill up the inside of my vac pump with RTV today.
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Old September 22nd, 2010, 19:54   #6
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UPDATE: see posts 12 & 13 for correct part to use

Ok, I just had a F**K YEAH! moment. Hanging at my shop waiting for my GF's plane to land since my shop is close to the airport.

I am doing a motor swap on this golf so I pulled the vacuum pump apart since he's getting a new (used) one with the motor he just bought.

First of all, this one was not leaking appreciably



so I took it off and took it apart. There are 3 T-30s that have to come out to split the pump in half:



Using a screwdriver to pop it apart after the bolts are out (I know, these pics are overkill):



Turns out, this seal is a simple o-ring, formed to the shape of the vac pump body. Here is a pic of me holding up an old ALH oil filter o-ring I keep in the box to hold the lower charge pipe to the sway bar end link while doing a timing belt change, next to the seal I removed from the pump:



as you can see, they are essentially the same total diameter seal and the next pic demonstrates that this used piece of trash o-ring fits quite perfectly into the boss in the vacuum pump body:



That one shows the "new" seal pressed into the boss in the pump body with the old seal sitting dejectedly aside.
The "new" seal is actually of a bit thicker cross-sectional diameter which should theoretically provide a better seal.
I should also assume that it will easily last 10,000 miles (the frequency at which these used seals are generated) before it leaks again.

I hope that everyone finds this information as useful as I do.

Now I can actually fix this leak instead of having to appologize for the car.

Last edited by runonbeer; December 16th, 2011 at 09:02.
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Old September 22nd, 2010, 20:29   #7
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Ya...I thought about that oil seal but didn't have one handy and figured the fipg would take care of it.

Score!

FWIW, mine looks good, fipg holding.
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Old September 22nd, 2010, 21:03   #8
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I knew there was a reason why I kept a bunch of my used oil filter "O" rings...

Nice going,

Yuri
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Old September 22nd, 2010, 23:15   #9
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can't wait to get my hands on a PD tandem pump...
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Old September 22nd, 2010, 23:17   #10
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Quote:
Originally Posted by ymz View Post
I knew there was a reason why I kept a bunch of my used oil filter "O" rings...

Nice going,

Yuri
There are now two reasons
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Old September 23rd, 2010, 07:11   #11
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Quote:
Originally Posted by runonbeer View Post
can't wait to get my hands on a PD tandem pump...
...just ask jim for the one I sent him. The seals are smaller, shaped, and not simple buna rubber...so best of luck. If you can find a solution, you'd keep a lot of fuel from drooling out of these pumps onto the ground as well as drastically improve starting perfromance after the car sits for a couple days. The only recourse at this point is to replace the complete pump, which lists for over $300 IIRC.
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Old December 11th, 2011, 09:37   #12
runonbeer
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Bump.

It's actually some brands of ALH oil filter orings that are too thick. BRM filter O-rings are just the right thickness.
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Old December 16th, 2011, 08:54   #13
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O-ring is 74mm x 3mm
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Old December 29th, 2011, 17:48   #14
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While on the topic of vac pump leaks, has anyone had the nipple come loose creating a leak?
Thanks
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Old December 29th, 2011, 18:39   #15
runonbeer
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Yes they have. I'm working on that. For now, just slather some JBweld on it.
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