AGV64

Hi Wayne,
There were several reasons for me to drop the engine…
One, I was not sure how far I would tear it down to find the source of those filings…which at this point I have not seen yet.
Our northern climate has not been kind to some of the bolt hardware…like the exhaust manifold.
The one coolant pipe that goes over the engine bay needs to be replaced as well; injectors need should be tested..
So between a number of items that I want to take care of, gave me enough reason to pull it out to make things easier.

Wayne Smith

And besides, we all need a project!!!!

But I'd keep to the basic maintenance and then plunk the motor back into the car.

FWIW, I only use Chevron (for the cleaning power of Techron, which is now in Shell as well) and still have my original injectors at 155K miles. On another point, I'm on the original coils as well ... this car has never seen salted roads, which helps.

AGV64

Just a quick update...couple of pictures in sequence
Cylinder 1



Cylinder 2



Cylinder 3



Cylinder 4



Cylinder 5



Cylinder 6



Side note...86 951 cylinder walls with about 600000km on them...doing a head gasket

Petza914

Those don't look too bad yet. Obviously no lines is the ideal, but none of those look especially deep. If they stay like that you probably won't even be able to tell.

Driven DI40 every 4k miles.
​​​​

Wayne Smith

What Petza said.

My worry would be the carbon build-up. I believe in Chevron with Techron, which keeps my motor clean. An additive with PEA would be a good idea too, although I get nervous about releasing too much carbon in a single shot.

Prairiedawg

I would bet money most 997.2's cylinders look like that in varying degrees. Because they're claimed to be bullet proof, nobody looks but engine builders. They say it's much more common than everyone thinks. You don't find what you don't look for. That doesn't look like the typical seizure scoring that leads to the demise of the engine but I'm no expert. That looks like particles of something getting caught between the piston and the cylinder walls. bits of carbon maybe?

Maybe @Charles Navarro might see this pics and comment. He's seen more than anyone around these parts and I consider an expert. I bet he has some pretty good explanations or theories.

Graufuchs

Agreed, you also should make sure the ignition system is working as efficiently as possible. That will help carbon from building up along with PEA based fuel injection cleaner. Maybe .5 bottle for a full tank to slowly start knocking out those deposits.

Consider plugs/coil packs since the engines out. Should make it a bit easier.

NvsCardealer

think this is a very pertinent question and am following the post with interest. MAybe someone knows and engineer with specific experience in this area?

AGV64

Need a little help from the community to help me understand what I am looking at…
any help will be greatly appreciated.

silver_tt

Wear metals look acceptable for 4,000 km. Does not indicate bore scoring.

jchapura

Fuel dilution might be problematic. Getting closer to 0.5% is better.
If most of your miles are shorter trips where engine oil temp doesn't stay elevated for longer times then that could be contributing to the problem.
If most of your miles are longer trips then you might have a troublesome fuel injector.

silver_tt

Port injected engines will be ~.5% but direct injection engines run higher fuel dilution... generally up to 2% is acceptable but it is likely what is contributing to the low cSt viscocity

AGV64

Thank you guys...
Most of my trips are about an hour to and from work...about 150km round trip.
Having said that, the car has been sitting in my shop since November; with reluctant start up's to move it out of the way.
Hoping the next oil sample will give a more accurate picture.

Petza914

Looks fine - keep an eye on iron using this oil for bearing wear. It's borderline for 4k km, but OK.