cam0141

Have a newly acquired 2009 CS4 with 28K miles. Maybe I'm hyper sensitive to the whole bore scoring issue but since I was changing the plugs I thought I would do a little bore scoping while I was at it.

My silly question of the day is: How do you bar over the engine to get cylinders at BDC? There doesn't appear to be a crank pulley and bolt to bar it over?

I'm guessing pulling the fuel pump fuse(s) and bump it with the starter?

Thanks.

Really enjoying the forum. Learning lots about my new toy.

hankcah

I'm not familiar with the bar method, but you'd have just as much luck doing oil analysis via Blackstone Labs. I'd look into getting an aftermarket warranty for the major bits and DIY on the lesser issues.

Quadcammer

nvm

yvesvidal

If you have a manual transmission, you can move the cylinders by rotating the wheels.
If it is PDK, you will need the special tool that plugs on the crankshaft damper (#5 on the picture).

Yves

cam0141

thanks

Mumbles

I'd just drive it.

snaphappy

I don’t know, but I encourage the bore scope. You’re there anyway. It won’t hurt anything and could give you peace of mind. Plus it’s just fun to do a deep dive. I use these guys for UOA: https://www.speediagnostix.com/

linderpat

My tax law professor used to say "ask me no questions and I'll tell you no lies." Drive it like you stole it and enjoy the hell out of it. Gorgeous car BTW.

Doug H

This. Scoping a 997.2 engine with no symptoms send pretty silly to me unless just bored and need something to do. Drive it like you stole it.

snaphappy

Ohhhh I missed that it’s a 997.2 - scope is not necessary. Could still be fun. But not necessary. I seem to remember Jake Raby saying a bore scope on a 997.2 won’t work anyway. Something about the design being different.

jimwood

There is no bore scoring issue. I read the entire mind numbing thread. In my opinion one person had an issue the cause was not clear.

Enjoy the car.

Prairiedawg

I'm pretty sure I remember Jake Raby recommending scoping any engine whether it's a M96/97 or a 9A1 (997.2). Seems most of the problems on a 9A1 happen on the #1 cylinder. If nothing there then your probably fine.

Bronz' engine had severe scoring and it seems the symptoms started all at once. The scoring had to have started long before that. The GTS I just bought is a CPO car. I plan on having the cylinders scoped about 6 months before the warranty expires, just because. Are there any symptoms? Nope. Do most scored cylinders have symptoms? Nope. Do I think I have scored cylinders? Nope, but if I do I want to know before the warranty runs out.

Prairiedawg

Not true, extremely rare but does happen. Jake, Baz, and Charles Navarro have all commented that it does, though rare. All have different theories as to how.

There have been several documented cases on RL including 991's, even 981 Spyders. Fluky, but it does happen.

jimwood

Disagree. There’s no issue. Every engine has some failure rate. Sorry you’re unhappy with that fact.

Also - when you let your car sit for a long time, drive it two miles, let it sit for a long time, drive it two miles - your engine is going to fail.

“Extremely rare” - Ladies and gentlemen of the Jury - I rest my case that there is no “issue.” There are rare occurrences.

Prairiedawg

I'm not unhappy about anything, I don't know where that comes from. I'm just pointing out, while rare it isn't nonexistent. It has been documented here and other places by members as well as rebuilders such as Flat Six and Hartech. They all have their theories to the causes, which differs from the 997.1 engines. Baz at Hartech has written at length on the 9A1 on these threads

If the OP wants to scope his bores, then thats his prerogative. Telling him it doesn't exist is incorrect. Statistically there is probably nothing wrong with his engine. If it gives him a warm fuzzy, then good for him

I will have mine done as well at some point. It lived its life so far in Northern states. Its probably fine. If so, it will get oil changes with a high moly content, and will be perfectly fine for the remainder of its life.