My 911 SC Engine Rebuild Thread

[OsoMoore]

Now to start pulling off the exhaust. Found some interesting things.

The joint between the heat exchanger and the crossing exhaust pipe on the 4-5-6 side was full of oil. Probably half a cup came out when I opened that part up. Note that my destroyed valve was 3.

Taking off the heat exchangers wasn't as tricky as I feared. The inner bolts on the exchangers were actually just stacked with washers, maybe as a stand-off? Not sure how that worked. But that meant I just had the 8mm studs and then 3 nuts per side.

4-5-6 side was pretty oily, especially at 6.



1-2-3 was not as oily. Here's a video of her as she stands now. (May take a minute to be available).

https://youtu.be/6zh79LVmjPE

[OsoMoore]

Video of the from the top. Three is the boomed cylinder.



Video from the bottom.

[OsoMoore]

Obviously I want to know why this happened.
Is there anything I should note, record, or measure as I take things apart to help me identify the cause? I'm trying to take a lot of photos and some good videos, but I don't know what to look for besides "the broken parts" and "lots of oil/dirt" where it shouldn't be.

[PeteKz]

Take pictures as you disassemble it. The valve guide is gone, so I would want to know where that went.

[ant7]

Originally Posted by ant7

Lots of help available here when your ready to pull it apart, just take your time, and inspect everything methodically as your removing it, label things your not sure about, and take plenty of picks as you go along for your own reference, they will come in handy when asking questions, and help with re-assembly etc.
Good luck with it
Ant.

[snbush67]

Good work, Opening the chain box covers should be enlightening. I noticed in the video the sump cover is on, did you take it off to drain the oil and then put it back on ?

[OsoMoore]

Originally Posted by snbush67

Good work, Opening the chain box covers should be enlightening. I noticed in the video the sump cover is on, did you take it off to drain the oil and then put it back on ?

I did not take it off yet. Should I do that now?

Cam housing covers are now off. I need to identify the correct Porsche Tool(s) to remove my camshafts. I took some careful pictures, so that should help me identify the right ones.

Then while I'm waiting for the special tool, I can clean things up.

[Dpmulvan]

Originally Posted by OsoMoore

Obviously I want to know why this happened.
Is there anything I should note, record, or measure as I take things apart to help me identify the cause? I'm trying to take a lot of photos and some good videos, but I don't know what to look for besides "the broken parts" and "lots of oil/dirt" where it shouldn't be.

Start by Tearing it down to the case, pull all the oil plugs and piston squirters. This thread should be over in the engine forum.

[OsoMoore]

Originally Posted by Dpmulvan

Start by Tearing it down to the case, pull all the oil plugs and piston squirters. This thread should be over in the engine forum.

Aha, engine forum! I didn't even think of the fact that there's a rebuild-focused subforum. Here's a new thread - I'll make future updates over there.

Engine Rebuild Subforum Thread

[mikedsilva]

Originally Posted by 911 Rod

You really need the proper yoke. I like the heavy duty stand for stability and you can put a tray under it.

hi Rod
i know this is off topic, but how loud is that exhaust setup your're running?

[911 Rod]

Hi Mike. Pretty loud WOT. Burbles a bit at idle. I can drive it under the noise radar, but when I’m on it you notice me. Lots of compliments at the track on how nice it sounds especially when bouncing off a wall.

[OsoMoore]

Big surprise in the engine teardown thread - the camshaft bolt was loose! Going to see where this leads...

https://forums.pelicanparts.com/911-engine-rebuilding-forum/1179839-1979-sc-chewed-valve-total-rebuild-2.html#post12493691

[OsoMoore]

I think I may have located the instigating failure. The rocker shaft on the valve rocker that failed was far far out of alignment.
https://forums.pelicanparts.com/911-engine-rebuilding-forum/1179839-1979-sc-chewed-valve-total-rebuild-3.html#post12494493

[mikedsilva]

Originally Posted by 911 Rod

Hi Mike. Pretty loud WOT. Burbles a bit at idle. I can drive it under the noise radar, but when I’m on it you notice me. Lots of compliments at the track on how nice it sounds especially when bouncing off a wall.

Thanks for that.
I must be getting old... looking for something quieter these days