Ken D

Glad to see you're doing it the right way!
Please note the second point of Colin's (NineMeister) post - important to clean out any possible debris from the oil system, from the lines up to the cooler.

RicardoD

Navaros,

I think your diagnosis of root cause is correct. Proper air intake filtering is obviously super critical in your area. Wonderful that you are keeping it stock. I really like the Jubilee edition car.

Navaros911

Looking at pistons and cylinders here and can't get out of the differences between them.

I can find the 964 103 915 22 parts... but there are also some Amazon parts that seem to be the same, but they have Mahle part numbers of W0133-1597062.

There is no data I can find on the latter in terms of practical application... so I wonder if they are any good.

Anybody has any experience or know what the difference between the two is?

Indycam

964 103 915 22 = Porsche part number
W0133-1597062 = Mahle part number
Same parts , different numbers .

Navaros911

Indy,

Are you 100% sure of that?

I searched high and low on the internet trying to get clarity on this and there is nothing out there to confirm the parts as being the same.

The Mahle part numbers seem like a well hidden secret. A lot of general car part stores have the Mahle number listed... sometimes they reference back to the 964 103 915 22 or 964 103 915 25 part numbers, but the last thing I want is to end up with a set that is "slightly" different from the Porsche stuff.

Indycam

Nava ,
Porsche doesn't make the pistons and cylinders , Mahle does .
Your car rolled out of the factory with Mahle pistons and cylinders .
If you go to the Porsche dealership parts deptment and order a set of pistons and cylinders
you will get Mahle pistons and cylinders .

There are two types of cylinders , early with no groove and late with groove .
Your photo shows that you need the late type with the sealing ring groove .

964 103 915 "22" - 964 103 915 "25"
The last two digits =
"22 - 644-652g mark --/-
23 - 652-660g mark +/++
24 - 644 -652g mark --/-
25 - 652-660g mark +/++"

If you order a new set
you will get a matched set
so the last two digits are not going to mean anything .
If you were looking to replace just one
then the last two digits would be what you would be looking for .
If you had a "22" set you would look for a matching "22" piston / cylinder .

JasonAndreas

The european version of the Mahle Catalog has the technical specs, application (as well as the discontinued) list for all their cylinder and piston combos.

Navaros911

Indy,

Thank you for the info... just wanted to be completely sure... I've had some surprises with rear brake rotors and Amazon. Just trying to make sure it doesn't again.

I'm aware that Mahle must have the same pistons and cylinders as what the car came with... I'd be surprised if they had a different mold... it's just that I'm used to being able to verify this like I do with the Bosch parts.

Just to be sure I asked the seller for a picture of the number plate on the parts.

Now on to the bearings and a gasket kit for the bottom.

Now that I got over the initial shock, I'm fine with doing it right, since I'll never sell this car... despite the weekly offers I get

Navaros911

Jason,

Thanks for the link... do you know how to read the info on that site?

I got quite lost on what I'm looking at... hard to find some part numbers. But I did come across a 993 part number in there with the actual full Porsche number.

I'll dig a little deeper hoping to find something.

Navaros911

Anybody has an idea how to read the Mahle part numbers?

I can't figure out the catalog.

Navaros911

Guys?

Still looking for a second source to link these two part numbers.

FeralComprehension

Try the P-Parts rebuilding forum; there are guys there with decades of experience who may be able to help you.

Navaros911

Indy's statement was confirmed by a shop... I always look for multiple sources... and always over analyse and procrastinate.... especially when I'm on business trips and am killing time here and there.

Part 964 103 915 22 and 964 103 915 25
correspond to the Mahle part W0133-1597062 MAH

On to finding the bearings now.


I wasn't ready for a full rebuild... I was just thinking re-seal time.

Oh well... there is never a good time is there