Need O-Ring Part Number

[DogDiesel]

I have an AAZ engine.
I need the large coolant O-ring between the head and the coolant flange to radiator.
My engine uses the OEM plastic flange with metal inserts for the bolts and it simply has an o-ring.
Does anyone have the PN for that O-Ring?


Wayne
Virginia

The good news is that the leak is minor, and I am OK to drive.  The bad news is because it is an AAZ, no references (in the US) to the Part number can be found online.  I sometimes can use a 95-96 1.9TD reference, but in this case, no part number ever pops up on line.  Please help.

[DogDiesel]

I found the leak with the pressure tester. I was losing maybe 12 ounces of coolant if I drove all day, sometimes it is a week before the coolant level is low.
I have already replaced every coolant hose, of course radiator is new, over-sized and not a part has not been unchecked.

This is a minor problem, there are no bubbles in coolant, mixture is right, so Headgasket is not an issue. Probably the original O-ring from the factory.
I did not pull the flange when I installed the engine.

Wayne
Online research shows  PN REI-G4030-134291 from Redline a 50mm x 4mm 42mm ID o-ring (1.968 x 0.15748 inch) fits 1996 VW Jetta TDI from Canada- Victor Reinz
as usual when I called local parts place, the metric confused them, and said if I would bring the coolant flange in, and the old o-ring...
you gotta love the help.

If this is such a common O Ring, someone should have a part number.
removing the flange and hoping I find a ring to fit is not an answer.
That is a last resort option.

[theman53]

50x4 sounds exactly like the water pump housing outlet o ring. .56 each at autohausaz

[DogDiesel]

Took a chance and ordered 5 O-rings from AutohausAZ, which for a 1996 Jetta TDI (AAZ) specifically call for:

059121119  Thermostat Seal; O-Ring; 50x4mm  $0.56

There is no way I intended to fish for a repair part.  Here is why.  My farm is 1.5 hours from where I work and live.  I do my work out at my farm, which is 25 miles from any parts store, and on the weekends when I can work on things,  mostly the only places open are like Advance Auto, O'Reilleys, etc.  NAPA is closed on the weekends or has limited hours.

Going into this without a part.  no way.  Leaving it there.  Trailering or driving one of my farm vehicles back....nah hah, no, hell freaking no. 

It is only an o-ring.  Common part.  right?

I have already upgraded my hoses to VEE GEEs (red) silicone lifetime hoses.  Good fitting, sharp looking, and by the way, when I changed the oil, access to the filter was never better.  I have a new coolant surge tank, now have a test cap to my pressure kit, which is how I found this leak.  I installed the largest Schirrocco race radiator and customized my fan to it.  It has the bottom hose on the left under the battery, so I can hook my AC hoses up and not hit that hose by the filter.  Found a temperature sender that plugs into the radiator within the temp range, and everything is cool.  Little annoying to have a simple O-ring stymmie perfection...
Wayne

[Jetmugg]

McMaster Carr is my go-to spot for O-rings. 

If you know the dimensions you need - you have won the game.

Steve.

[burn_your_money]

PN 037 121 687 should do it

[DogDiesel]

The above information is accurate if the outlet is metal (aluminum).
 
If the outlet is plastic like mine, with 068 121 133 AE, that converts to Beck Arnley 147-005, Thermostatic outlet.

for the 068-121-133 AE, it is not a common O-ring, but a preformed gasket O-ring approximately 34-36mm x 4mm and it uniquely has rubber that goes into the crevices of the two metal bolt sleeves.

That gasket is Beck Arnley 039-0033 (app 34-36mm) and is elliptical not round in shape with preformed extra rubber for bolt sleeves.

The small o-ring that goes into the plastic thermostat outlet for the sender is 039-6443.  Its about 20mm x 3 in true O-ring shaped.   I ordered the o-ring and clip from AutohausAZ with PN 90917-06055 (039-6443). 

When I removed my thermostat neck, the inside had a crack, which did not go thru and the inner plastic was chipped.  I will fix this right.

I ordered two 039-0033 o-rings and will put my Caddy back running, and when the new plastic outlet comes in fix again by replacing everything.

The metal outlet only supports one hose to the radiator, the other hoses to the cooler are not supported.  I got the parts from Advanced Auto, who could get everything.  Autozone, O'reilleys and Pep Boys could not support me on this find.  Did not try NAPA, largely due to all the hours NAPA is open I am at work, and when I get off they are gone. 

So for the advice to take the outlet and go size an O-ring, that would not have worked.  The plastic thermostat outlets require a special gasket.
Incidently, the particular outlet I have shows up in USA parts stores fitting a 1995-1996 Passat with AAZ.  Let me state again, if your AAZ outlet is plastic, the 50mmx4mm gasets are too large, and will not fit.  Plastic outlets have special gaskets, and sizing an o-ring to fit will likely result in a cracked plastic housing.

Wayne

[DogDiesel]

The O-rings came in and even I was surprised that they were 50mm x 4mm.  So don't anyone order them from Advanced Auto, that database will never change.

Drove up to Bap Geon, Import specialist.  ordered 028-121-132A O-ring and 037-121-687 coolant neck.  Dare I hold my breath.

Went I find a correct part number I will post it.  for now, I do not know what is right.  I am pissed. I tore my truck apart, and I certainly wont put it together with that old O-ring.

I am peeved.

Wayne

[theman53]

You were the one that said it measured 50x4 right?
If you go on autohaus az site, enter 97 TDI and go to cooling system, then Coolant Outlet O-Ring; Hose Flange O-Ring; 36x3.5mm ...

it is there for .54 each.

[DogDiesel]

My intent here is to post the correct part numbers for O-rings for plastic outlets and the metal outlets.

It appears the information is unknown.  Please be patient and I will post correct information, when I discover it.

If I had the right info, I would have the leak fixed and the topic dead.  Everything I ordered so far, no matter the number takes me to the 50mm x 4mm.

That won't work for my AAZs with plastic outlets.

Bap Geon will call me today they said, when the parts are in.

Wayne

This is what happens, when I post information based on data, versus part in hand.  Data is garbage in-garbage out at times.  This is such a case.  For instance, numerous databases say the 50mm x 4mm is good for 100% of AAZ.  Apparently, even by the databases, not so.

[DogDiesel]

Replaced the 037-121-687 coolant neck.  No leaks.  The inside of the old plastic neck had deteriorated.  It was doomed to leak again.
New neck came with o-ring, plus I have an extra o-ring spare.

Filled with antifreeze and tested.  Easily held the 7 PSI and more.

One problem solved.

Wayne

[greaseworks]

Just to clarify the proper O-ring for that coolant neck is:
037-121-687
36 x 3.2mm

The front coolant flange p/n is:
028-121-132A 

And yes this normally comes with the new Oring installed.




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[DogDiesel]

I must disagree.  I listed the part number above that matched the coolant neck I installed.  Here is what I found:
Cross-over PN necks take different part numbers.  The neck I received from Beck Arnley was to the same spec as the original, however the O-rings were not the same.  Same size, but the shape was not identical.  I believe you are correct on the OD demensions, however neither of the O-rings resemble O-rings.  They more resemble rubber gaskets.  I did buy an extra O-ring which matched my neck.  Lesson learned for me was the new neck and O-ring cost $7.73 before tax.  My old neck was deteriorating inside, eroding and flaking.  My advice to owners now:  If it is plastic, buy new neck, which comes with O-ring.  save time and money.
Wayne

Just to clarify the proper O-ring for that coolant neck is:
037-121-687
36 x 3.2mm

The front coolant flange p/n is:
028-121-132A 

And yes this normally comes with the new Oring installed.




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