Scored cylinder - awaiting reman. from porsche
 

Fellas - this is an update to a video I postedof a knocking noise from 08 targa 4s.

The service advisor told me that cylinder 4 is scored.
They are in the process of getting a remanufactured block
from porsche which will be fitted with new parts.

I will post update once I get car back. I have to say, I learned that CPO
doesn't mean the car is OK, just means if the sh-- hits the fan, it will
at least be covered.

I was advised to obtain PPI even on the CPO, I did not. I now see this would've
saved me aggravation and time and recommend PPI on any CPO.

Any idea of HOW that one cylinder got scored?

I understand your frustration but wonder if a PPI would have caught that problem.

I dont see how a PPI can catch a scored piston, you have to remove the heads and tear the internals apart to evaluate that. If anything i think leakdown and compression tests would have had to be done to get any remote idea of a scored piston.

Well yes. I should've said a PPI with comp & leak down. You are absolutely correct.
The 996 and 997s have had issues with cylinder scoring. Unfortunately this is not rare,
and also it is not necessarily a reflection of poor maintenance. Rather it is a design flaw
which is why I prefer a remanufactured block (done by hand) rather than a new block which
would be computer. In general, the reman. blocks assure a better fit with pistons and other parts.

Hi Pabafree-

Sorry to hear of your troubles. Are you working with Porsche of Arlington on this? Have they been good to work with? I'm shopping for a dealer service outfit to use with a new car I bought outside of Philly this fall.

Thanks, and Happy New Years -
Marc

You need to read this thread, specifically part 5, and understand why you have a scored cylinder.

New Hartech 997 Buyer's Guide

what thread ?

The thread, New Hartech 997 Buyers Guide, posted by cbzzoom, yesterday, click on the link he provided. Part 5 goes into the specifics as to why the 997 .6 and .8 engine is prone to cylinder scoring.

ah - this : http://www.hartech.org/docs/buyers%2...20part%205.pdf

good read...

Lubrecon - thank you so much. It is 28 pages, I skimmed it, but makes sense and giving me some questions to ask the dealer when car is ready.

Here is the link:

http://www.hartech.org/buyers.html

After reading some of the potential causes, do I ask them if they are replacing the water pump, thermostat and other components? Would that be customary to do when replacing the engine?

Yeah, this appears to be one of the primary failure modes of the 997. Barry Hart of Hartech has investigated it more than anyone and describes it in detail in that document posted here :

https://rennlist.com/forums/997-foru...ers-guide.html

It is very rare, but I suspect we'll be seeing more of it over the next few years.

pabafree , be thankful you at least had the CPO and aren't paying for an engine rebuild yourself!

pabafree95;8172689]After reading some of the potential causes, do I ask them if they are replacing the water pump, thermostat and other components? Would that be customary to do when replacing the engine?[/QUOTE]

If you wind up getting a new crate motor, it comes with new everything.

pabafree95, don't just skim it, read it completely, especially the last few pages.