Found 2 teeth on my oil drain plug magnet (Now: Cam swap thread on 944S)
08-08-2010, 10:31 PM
#32
Race Car
More than likely, this car recently had a timing belt/water pump failure.
That head looks too clean inside to be original.
Chances are, the belt popped, interference between the piston and valve stopped the engine cold and inertia from the spinning cams overrun overloaded a couple of teeth.
The previous owner or his mechanic, serviced the bent valves and reused the cams and tensioner.
T
That head looks too clean inside to be original.
Chances are, the belt popped, interference between the piston and valve stopped the engine cold and inertia from the spinning cams overrun overloaded a couple of teeth.
The previous owner or his mechanic, serviced the bent valves and reused the cams and tensioner.
T
08-09-2010, 07:55 AM
#33
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this is all possible, (and yes, i thought the head was overly clean too) the only reason i'm worried is that the teeth were JUST found on the drain plug.... an oil change is done every 5000kms typically , so you think this would've happened within the last 5K
08-09-2010, 09:39 AM
#34
Race Car
It's even possible that they were only cracked at the root where they intersect the cam itself and the last person who worked on the car honestly didn't see the cracks......in other words, they may have just recently fell to the pan.
And yeah....with sludge in the bottom of the pan, sure it's possible that they just made their way to the magnet.....the drain back from the head to the pan is unobstructed.
If you can verify that no other teeth are damaged, I don't see why this engine can't be run as-is, since the chain is always in contact with 10 teeth or so at a time on each cam.
What I'd be more worried about is the integrity of the chain and other teeth because these could have passed between the chain and sprocket as they left the cam.
Looks like you have a new fresh head.....just get the cam someone here is offering and fix it right if it bothers you.
T
08-09-2010, 09:45 AM
#35
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hey dont get me wrong i thought of that too... i've wondered if i could just replace the tensioner pads and chain and run it... like you said (and i was thinking) there are ~10 other teeth holding on... 
Last edited by Porsche16V944; 08-09-2010 at 10:04 AM.
08-09-2010, 11:06 AM
#36
Race Car
T
08-09-2010, 01:58 PM
#38
Rennlist Member
I wouldn't do that if I where you. You are asking for trouble, in theory it sounds fine, however who knows if the other teeth aren't damaged. You will end up crying worse if you get it back together and have a high rpm failure (which more than likely will happen if this has already happened).
08-09-2010, 02:05 PM
#39
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^ I'm going to have to agree. If several teeth broke off I'd wonder if more are on their way. While I can't speak for anyone else, that thought in the back of my head would make it difficult for me to enjoy the car.
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08-09-2010, 02:07 PM
#40
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ya thats true..... i shouldn't half *** this........ just sucks cause i JUST bought the car, drove it for 10 days before changing the oil and then i find this
08-09-2010, 02:48 PM
#42
Race Car
It's one tooth per cam from what you can tell in the pics.
If none of the other teeth showed stressing, personally, I'd run the he11 out of it...
You could always shop for a complete head assembly and have it reconditioned and ready to bolt on if that catastrophic day ever came.
These valves have very small diameter stems and will bend like a wet noodle instead of damaging a piston.
Another option is to do the kit that uses two exhaust cams and runs two cam drive pulleys external to the head just like the one that does now, doing away with the internal chain and tensioner completely but I think hood clearance is an issue.
T
If none of the other teeth showed stressing, personally, I'd run the he11 out of it...
You could always shop for a complete head assembly and have it reconditioned and ready to bolt on if that catastrophic day ever came.
These valves have very small diameter stems and will bend like a wet noodle instead of damaging a piston.
Another option is to do the kit that uses two exhaust cams and runs two cam drive pulleys external to the head just like the one that does now, doing away with the internal chain and tensioner completely but I think hood clearance is an issue.
T
08-09-2010, 03:57 PM
#44
Nordschleife Master
It's one tooth per cam from what you can tell in the pics.
If none of the other teeth showed stressing, personally, I'd run the he11 out of it...
You could always shop for a complete head assembly and have it reconditioned and ready to bolt on if that catastrophic day ever came.
These valves have very small diameter stems and will bend like a wet noodle instead of damaging a piston.
Another option is to do the kit that uses two exhaust cams and runs two cam drive pulleys external to the head just like the one that does now, doing away with the internal chain and tensioner completely but I think hood clearance is an issue.
T
If none of the other teeth showed stressing, personally, I'd run the he11 out of it...
You could always shop for a complete head assembly and have it reconditioned and ready to bolt on if that catastrophic day ever came.
These valves have very small diameter stems and will bend like a wet noodle instead of damaging a piston.
Another option is to do the kit that uses two exhaust cams and runs two cam drive pulleys external to the head just like the one that does now, doing away with the internal chain and tensioner completely but I think hood clearance is an issue.
T
08-09-2010, 04:14 PM
#45
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Honestly, I can't tell you what to do. If you're comfortable driving the car then drive it. I've come across many people who have been exceptions to "the rule" and I hope that you are one of them. I just know that I wouldn't be comfortable with it. While I wouldn't want to spend the extra money I also know that I would have far more confidence in the car if I did.
But then, I tend to get rather neurotic about things that aren't quite right...
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