Z928328

Just say I'm running out of option here to get a 2nd hand block around Brunei etc..

Can mine be repaired? And has anybody done it?

Attached is the damaged.. only that crack..

My car is a 92 GTS 5.4

Speedtoys

Nope, thats beer cans now.

Ship in another one.

FredR

I understand engines have been rebuilt from that level of damage but it is a major task and you end up with something completely different to a stock motor presumably because the parent material is alusil and that does not lend itself to being welded easily due to the silicon content.

Thus if you could find someone capable of doing such work it is highly specialised and would likely be on the other side of the world and then you need to have a lot of trust in them- we have folks on the list who are very knowledgeable in this area who will hopefully give you a deeper insight.

Thus I suspect your minimum [realistic] option would be a replacement block and a GTS one at that presumably - a very rare commodity- not sure you can even get a factory replacement $$$'s not withstanding.

Beyond that the next question will be whether the piston is viable given a crack like that but that would seem a relatively minor issue by comparison.

As a matter of interest- what happened? Head gasket failure leading to ingress of coolant and then the cylinder cracked with non compressible coolant inside it during cranking?

Hopefully someone will have a more encouraging synopsis for you.

Rgds

Fred

GregBBRD

Because GTS engines are so difficult to find, I've been forced to fix these engines with cracked cylinders.

We repair the crack and machine the cylinders (all 8) to accept a custom iron liner we designed. We run a custom piston and rings designed for these liners.

Common enough repair that I keep pistons for this application, in inventory. Also have used sets of R2 connecting rods to replace your original weak version rods.

Strosek Ultra

I am sure Mr. Brown is aware of the fact that installing alusil liners is another way to repair a 928 engine block. If one cylinder only need attention it will be a less costly less complicated way to perform the repair.

http://www.ms-motorservice.com/en/ne...r-technipedia/

http://www.pierburg-service.de/ximag...199_en_web.pdf

Red Flash

Wow, I did not know that this is a "common repair." Is it common for GTS' or is it "common," or in general common for all larger deplacement (i.e. 5.0l and 5.4l) engines?

Imo000

What the heck happened to that piston? Is the rest of the engine salvageable?

GregBBRD

I do not know of anyone that has those liners, in this country, to do this repair....but you are certainly correct.

It would be both simpler and cheaper, if the rest of the pistons are still good.


BTW....to the OP......if that cylinder head is damaged, I also have some really nice used GTS cylinder heads in stock.

GregBBRD

"Common" is a relative term.....probably the wrong word completely.

Let's just say that we have done this and can do this....enough that I have the proper pistons, for the GTS application, in inventory.

We generally do not attempt to repair anything except GTS blocks (which are very difficult to find), unless someone is very adamant about keeping their original serial numbered block in their original chassis.

stuartbrs

No comment on what is right or wrong, but these letters in relation to my old blue S will at least show what the official Porsche view is on liners.

stuartbrs

Just want to be clear I`m not trying to have a go at anyone, but thought the letters I have might contribute to this discussion.

The liners that failed were installed at a Porsche dealership.

Strosek Ultra

You can buy the liner blanks directly from MS. Motorservice in Germany or ask them where to find liners in the US.
Email: customer_service@ms-motorservice.com
http://www.ms-motorservice.com/en/te...inder-sleeves/
http://www.w124performance.com/docs/...nditioning.pdf
http://www.electrosil.com.au/pdf/KS.pdf

FredR

Stuart,

Something in your note does not quite add up. The response from Porsche is totally predictable. If a franchised dealer does anything on any Porsche that is not approved by Porsche they risk losing their franchise as well as losing any insurance cover they might have for the work they do.

Not saying such a repair by a Porsche dealer could not happen but in a litigious society most unlikely that they would implement this work on such a critical element. If you know for a fact such happened fair enough but it would be somewhat surprising.

Independent dealers can of course do whatever they choose to do and if someone like GB puts his name behind a repair you can guarantee it will be sound.

It would be interesting to know how the liners that Ake highlighted are fitted. I was under the impression that a liner is something that you insert into a knackered cylinder but those things look more like they are "standalone" items that fit into the prepared base of the block to replace the monolithic cylinder that was cast with the block.

Rgds

Fred

stuartbrs

Fred, you are correct, this was a litigious circumstance, hence the third party opinion. The letters were part of the documentation that came with the car when I bought it.

This is a well known tale in these parts, I dont want to say much more, but there are several members on this board that know the full story.

Long story short, this was a Ford style repair, approved by someone at the dealership, with experience on this type of repair for American cars.

stuartbrs

The current owner has, I think, the original invoice for the full engine rebuild, which at that time, was over 20 grand, about the same as the value of the car back in 2000.

Worked out well for the car though as these days it has a 5ltr block with 16v heads on it and goes like stink!