speed rII

So, I was taking my 1-3 cyl.head apart today.
Plan was to change the variocam pads for this side. I all ready have changed the pads for 4-6 head.
Now i noticed that the sparkplug hole on the cyl 2 had slight colour change (yellow).
The sparkplug tube had leaked a litle, so could it be burned oil?
Other than this and the pad's the head looked like new.
I have changed the waterpump and the impeller was fine.

You can see it in the picture, thou the oil on it makes it look more yellow that it really is.

Pac996

Yes it is probably cooked oil like a chinese wok looks when it has been seasoned by burning oil onto the metal surface. I can't think of anything else it would be either.

Don't try the below with your car

The first video at 2:30 you'll see the same color

http://www.youtube.com/watch?v=hNPe5...eature=related

This lady uses a short cut skipping the yellowish color of burned oil.

http://www.youtube.com/watch?v=nDp_2x9kE8o

ivangene

my guess is a tube leak too - cooked oil.... does it wipe clean?

speed rII

It won't wipe clean, I tryed to scratc it of with a flat screwdriver and nothing.

Pac996

Baked on like laquer then probably.

I'm not sure if some of the industrial kitchen copper cleaners would eat that stuff off. I know its good for tarnish. I'd try q-tips with a cleaner on the spot. I believe hydrogen peroxide might be one NOT to try since I kinda recall it turns the metal black while eating metal.

speed rII

Cleaning is not my main consenern, i was just wondering that should i take the head of and check the coolant channels.

ivangene

tough call... can you run a leak down on it? and or compression test


most likely its just from a leaking spark plug tube and no big deal, but it would be a lot easier to fix it now then after you put the motor back in

rb101

I am one of the guys with the thinking of "while you are there", but I would not mess with it. I don't think you will find anything in the coolant channels.

Rick
99 996C4
87 944S

speed rII

I pulled the engine for IMS, RMS (did not leak) and the variocam pads. It had full power and no problems with losing water.
Have anyone seen something like this before?
I get the parts next week so I'm in no rush with this one.

chris walrod

A few times I've engines with discolored areas such that you illustrate. I dont think its anything to worry about.

Just have a look at the top of the piston with a flashlight or bend-a-light and compare it to the others. If they all appear the same, I wouldnt worry too much about it.

http://www.steelmantools.com/10150A.htm