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-   -   Broken Rocker Arm (http://forums.pelicanparts.com/911-engine-rebuilding-forum/836041-broken-rocker-arm.html)

E Sully 10-30-2014 04:16 AM

It definitely looks like there was lack of oil flow to the top end. That dirt seems to be the metal wearing away.

niki_west 10-30-2014 04:33 AM

That is my opinion as well. When I look at all my pictures, it seems that only the #3 intake valve looks clean, the rest are dirty. Although you can see that there is a bit of that black goo there as well. Could that have been built up in the last 4000 miles of driving w/o enough oil in the valve train?

http://cdn03.trixum.de/upload2/2000/...8ab9d59202.jpg

Flat6pac 10-30-2014 04:54 AM

Rocker
 
It's hard to believe you have pressure on the gauge and that much lack of oil.
The rocker face is hollow as is the cam lobe. And all that black around the oil port. I believe you have an expensive diagnosis all the way to the oil pump.
I would pull the oil line for the cam and at the banjo fitting, there has to be junk there.
Bruce

Steve@Rennsport 10-30-2014 07:45 AM

Although I cannot tell for sure without seeing everything for myself, it appears that the rocker arm broke due to lack of lubrication in the pin bushing.

From the rest of the pics, I'd strongly recommend engine disassembly as something is terribly wrong and there may be collateral damage.

JFairman 10-30-2014 08:28 AM

This is painful to see... I'm sorry you bought a car with a motor in this condition. It's going to be very expensive to fix right.

If you bought it recently I hope the previous owner didn't just smear wheel bearing grease on the cams and rockers to keep things quiet long enough to sell it and get it out the door...

NICE 69 S 10-30-2014 12:26 PM

Cam to rocker and rocker to shaft severely worn from lack of oil. Looks like many of the other rockers will be in the same shape when everything comes apart.
Seems like a lot of ugly things happen to Porsches in Florida.
Bob B

Walt Fricke 10-30-2014 02:19 PM

Agree - rocker faces, rocker bushings, cam lobes all show destructive wear from lack of oiling. You can find and fix the oiling problem, but that won't bring back the rockers, rocker shafts, and cams. Better start looking for replacements.

cgarr 10-30-2014 03:34 PM

Don't be to quick to just chuck all the rockers except the broken one you might be surprised what can be saved.

Before
http://tapatalk.imageshack.com/v2/14...aced067b2f.jpg

After
http://tapatalk.imageshack.com/v2/14...41f157cac6.jpg

niki_west 10-31-2014 04:46 AM

Thanks for all the tips and information. Now I just need to find the time to drop the motor out.
I'll post more info regarding the extent of the damage, when I get that far.

S***! I wanted to drive this car!

SCadaddle 11-04-2014 09:00 PM

Yeouch.

I'm certainly no engine builder, but the first thing I'd have to take a look at would be the banjo bolts that secure the external rubber/metal oil lines to the camshaft towers and make sure they are in fact a hollow banjo bolt and not just a solid bolt!

NICE 69 S 11-07-2014 09:38 AM

At this point, you are probably lucky that there was absolutely no oil at all, because that would have carried all that metal back to the sump and into the pump and bearings.
I would be interested to see what you find when it comes apart.

Mitch1 11-07-2014 10:01 AM

You'd be surprised. In a shop the other day and got to look at a 3.2 race motor with a hole in the case from thrown rod. Lead tech there said, "guy drove it in like this. This is the oil filter." I expected to see oil filter completely plugged. It wasn't. So, may not be as bad as we think. I hope not.

911pcars 11-07-2014 03:16 PM

Quote:

Originally Posted by NICE 69 S (Post 8343153)
At this point, you are probably lucky that there was absolutely no oil at all, because that would have carried all that metal back to the sump and into the pump and bearings.
I would be interested to see what you find when it comes apart.

And where did the metal pieces go? Think gravity aided by internal air turbulence.

Was it confirmed the engine was dry (no lube)?
Do you have a method to replace overheated bearings, cylinders, pistons/rings/pins, damaged crank, gears, cam and rocker bearings or to extract metal dust and bits from the engine/oil cooler w/o disassembly?

Sherwood

Scheebs 11-16-2014 02:43 PM

These pictures absolutely show no signs of oil anywhere.
I feel you're looking at an engine removal from car and a cam housing/head removal from engine. You need to determine amount of damage to cams, rockers, valves, guides. Unfortunately you won't be able to do this inside the car.

totle 11-17-2014 02:32 PM

Looks like it has starved from oil.
Rocker arm seems to have been going without lubrication. Should not be that dry in there


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