Cayenne955TT

Hello everyone,


This is my first post here on rennlist, but I have been lurking for a while. Need some help with my 2005 Cayenne turbo. Basically, I got the car for very little, and am fixing it up. The car has been diagnosed with a burnt exhaust valve. Everything else is ok otherwise. Cylinder 3/bank 1.


I'd love to just pull that head and get the head repaired...is that even possible with the engine in the car? Meaning, if I have to pull the engine, it might just be cheaper or easier to replace the entire motor.


let me know what you guys think!

Thanks,

Will

oldskewel

Here's some great reading for the weekend to inspire you:
https://rennlist.com/forums/cayenne-...fr-7163-s.html

Burned valve pic in post #3.

Dilberto

Turbo exhaust valves are sodium-filled. They rarely ever get "burned." Was there ever an accidental, Tiptronic downshift at high speed?

Cayenne955TT

I'm going to chalk it up to lack of maintenance with issues. When I got the car, every single coil pack was cracked and the spark plugs were awful. I'm thinking they just ran it like that for a while. The durametric indicates no over rev conditions (ignition rpm range 2) there were also vacuum leaks. Excessive lean/rich with poor ignition, etc.

Beautiful build and that's exactly what my valve looks like! No indication of whether it can come apart when still in the car, although it does hint at it...

All cylinders on my engine read 8 percent leak down except cylinder 3 the bad one. So if I can fix this by just removing the head in place I'll be ok...

-Will

J'sWorld

The problem begins with the guides.

Cayenne955TT

Intetesting....is this a common thing? Everyone I've talked to thinks these problems are pretty rare with these cars. The one shop I talked to said they barely work on cayennes because they tend to hold up.

-Will

J'sWorld

Not many get into Cayenne engines so how common it is we will probably never know. In my experience with those that have worked with the Cayenne engines, as well as two sets of personal turbo heads, the guides wear considerably.

Cayenne955TT

Thanks for the info....I guess after 13 years something is expected to wear. Otherwise the cars seem to hold up great.

Sounds like you have experience doing a head job - can the bank 1 head be done in car/do you need any special tools?

-Will

J'sWorld

You can get the head off with the engine still in the Cayenne. You need cam timing tools to put it back together.

Cayenne955TT

Wow....this is a game changer. Meaning now either I could do the job myself (with the tools) or a shop could. I've had some quotes but they have been insane (36 hours labor?). Now that I know you can do it in chassis, that helps out a lot. Are the tools available?

-Will

jeff spahn

You could possibly make your own set of cam timing tools (like the 928 crowd has done). I would venture to guess that they have timing marks on the cam you line up with the chain like a 928 and be spot on. Take lots of photos.

deilenberger

The cam timing tools are a bar like device that fits across the camshafts and has notches that drop down onto a non-square protrusion on the camshafts - locking them to each other. There is also a pin that is used to lock the crankshaft at TDC for one of the cylinders (forget which one.) The tools aren't horribly expensive - I seem to recall seeing a kit of them for around $100. The crankshaft is locked, the cams rotated until they are timed together with the tool, and then the bolts holding the sprockets in place are tightened. That's a greatly simplified explanation. I'd suggest that anyone considering doing this spend the huge sum of $15 for a year's subscription to AllDataDIY - for their vehicle - and get actual Porsche instructions and specifications.

Cayenne955TT

Luckily the tools seem to be readily available and only 100 dollars!

Cayenne955TT

Thanks for the heads up. That is what I gathered from the porsche service manual....their illustrations aren't the best. You are correct the tools are readily available/cheap.

-Will