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BTW, I found some 3.6L piston specs in the same website. Maybe handy some day :)   http://workshop-manuals.com/porsche/911_carrera_cabriolet_(997)/f6-3.6l/engine_cooling_and_exhaust/engine/cylinder_

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I'll leave all that to LN Engineering. looking at this right now:

http://lnengineering.com/products/watercooled-cylinders-pistons/porsche-boxster-cayman-and-911-model-years-1997-2008/36-911-nickies-inc-96mm-fsr-je-piston-set-inc-rings-pins-clips.html

may go from a 3.6 to 4.0. still doing some homework. it's the same price, so why not.

Edited by AWDGuy
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Nice photos! Just wondering if you had low oil pressure reading before the failure? The oil pick up seems to be clogged by ~40%.

Wonder if those are worn chain rail material clogging the oil pick up, which leads to oil starvation then cylinder scoring.

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I'll leave all that to LN Engineering. looking at this right now:

http://lnengineering.com/products/watercooled-cylinders-pistons/porsche-boxster-cayman-and-911-model-years-1997-2008/36-911-nickies-inc-96mm-fsr-je-piston-set-inc-rings-pins-clips.html

may go from a 3.6 to 4.0. still doing some homework. it's the same price, so why not.

Good choice...good choice..I'm drooling now :)

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Nice photos! Just wondering if you had low oil pressure reading before the failure? The oil pick up seems to be clogged by ~40%.

Wonder if those are worn chain rail material clogging the oil pick up, which leads to oil starvation then cylinder scoring.

I don't remember to be honest. chain rail heh.....I'll take a look at that tonight.

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Cool thread, sucks it had to happen though.  Glad to see someone not scared of tearing one of these engines apart.  Do you have the tools for reinstalling the wrist pin and pin circlips for cyls 4-6 when you're reassembling?  Also just out of curiousity did you have an IMS failure or did you install the LN preemptively?

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ln was installed before I bought the car. I do not have the tools. I will probably use a shop in Montreal to rebuild it. one of the mechanics at this shop took jake rabys course.

I'm pretty sure the scoring was caused by the low oil pressure due to the clogged oil pick up.

Edited by AWDGuy
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Keep the photos coming! How many miles on the engine and was it rebuilt before? The main bearings look pretty worn out.

The thrust bearing On the left seems to be facing the wrong direction. Was it flipped before the photo was taken?

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got to taking apart the carrier and pistons. took 20 minutes.

and more pics for bolt/sensor documentation. ..

 

 

Thank you very much for the pictures and updates.  I am looking forward to your future posts.

 

b-man

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anyone have specs for the crankshaft? specifically the measurement for the bearing journals? the machine shop said they can look at all that for me as long as I provide specs.

Edited by AWDGuy
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anyone have specs for the crankshaft? specifically the measurement for the bearing journals? the machine shop said they can look at all that for me as long as I provide specs.

 

I heard that information was never published by Porsche.

 

b-man

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lne is supplying the bearings. I'm sure the crankshaft is ok. bearings are worn but nothing looks scored or cooked.

I should know more next week. machine shop is done cleaning the cases so they are off to lne tomorrow.

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So the chain of events is

Worn timing chain guide shedding bits -> the bits clogged the oil pickup -> low oil pressure -> massive oil consumption + toasted bearings + scored cylinders?

Did you notice the low oil pressure when the engine was still running?

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