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-   -   Value please (http://forums.pelicanparts.com/porsche-911-technical-forum/210028-value-please.html)

ckissick 03-09-2005 12:21 PM

If the timing chain slipped while you were driving, then every valve would have hit a piston, and every valve would be bent. At least, that's what makes sense to me. Correct me if I am wrong, anyone. If you threw a valve, then one valve would be destroyed. The others would be fine. If you pull the heads and find one thrown valve and nothing else, then maybe it was a wierd coincidence.

Anyway, if it were me, I'd get someone to pull the heads off, with me there to watch, to get a first hand look at the damage. Then you'll know what really happened. You need evidence.

speeder 03-09-2005 12:42 PM

Quote:

Originally posted by ckissick
If the timing chain slipped while you were driving, then every valve would have hit a piston, and every valve would be bent. At least, that's what makes sense to me. Correct me if I am wrong, anyone.


OK, I'll correct you. ;)

If the chain slipped, only the valve(s) that were open would get hit. All of the valves do not open together. :cool:

sundaypunch 03-09-2005 12:57 PM

Quote:

Originally posted by nigel911

The original shop wants around $700 to strip the top end. If it is a single valve then he reckons around $2500-3000, more if there is additional damage. Basically I run the risk of dropping $700 (on top of $1009 for the 'update') to find out I cannot afford to get it fixed. Rock / Hard Place.

No offense intended, but why would you consider taking it to the original shop? :confused: It's one thing if they are fixing it for free but to pay them to take it apart and do a valve job on a motor they likely damaged doesn't sound like a good idea.

You've made it clear that you don't have the money to get it fixed. You need to decide (quickly probably) whether you are willing to proceed with a possibly lengthy legal proceeding or just write it off, sell it, and move on. Obviously most of us here hope that you keep the car and follow through with having the shop make it right. Of course it is easy to give advice anonymously online and a bit different to actually be the one that has to follow through with legal proceedings.

ruf-porsche 03-09-2005 01:22 PM

If you hire a lawyer to sue the shop, you spend more on the lawyer than what the shop will charge you.

Don't ask me how I know, had it with the legal system.

Even with bent valves the engine will still crank, and crank faster since there won't be any compression.

Don't ask me how I know, had it with twincam Ford engines.

Something else is the problem if the engine won't turn over. A drop valve would stop the engine from turning over, but that is not related to a tensioner upgrade. A drop valve is more related to an over-reved engine or a mis-shift.

A drop valve could lead to piston and head damage.

Pull the valve covers off and look at the top of each valve. If you don't see the top of the valve, there your problem, the engine sucked a valve down.

silverc4s 03-09-2005 01:26 PM

Best ally is probably the local PCA. He won't want to be on their bad side, probably...

ckissick 03-09-2005 01:28 PM

Denis,

If the engine didn't sieze immediately and kept rotating, wouldn't all the valves come into play, one after the other? My chain slipped when I tried to start the car, and I heard two loud clunks in quick succession. Sure enough, two bent valves on two different pistons. I figured at normal engine speed, all valves would get it.

ruf-porsche 03-09-2005 01:31 PM

Quote:

Originally posted by ckissick
Denis,

If the engine didn't sieze immediately and kept rotating, wouldn't all the valves come into play, one after the other? My chain slipped when I tried to start the car, and I heard two loud clunks in quick succession. Sure enough, two bent valves on two different pistons. I figured at normal engine speed, all valves would get it.

It depend on if the chain slipped on both cams or just one cam.

vash 03-09-2005 01:36 PM

i bet that even the mere mention of your intent to move the car for a second opinion will make him pucker. this is a sad story. your car is fantastic, dont sell. get a beater like nostatic suggested, or buy an all-weather riding suit and move your ducati up the totem pole to "daily driver".

donstevens 03-09-2005 01:57 PM

9 miles.....you know the shop may have forgotten to re-fill the car with oil....Or maybe they left something in there that claogged the oil pump. Did the engine seize or just clatter to beat hell? If it seized it was likely oil starvation. Then you have a case.

Don

nigel911 03-09-2005 03:31 PM

don - oil pressure was fine, the death of the engine was pretty un-spectacular...

vash - Duke as a daily driver - I'm may be stupid but I'm not that stupid...

silverc4s - Ooops, I let my PCA membership slide...

ruf - I promise not to hire a lawyer to fit a twincam Ford engine into the car...

sundaypunch - without wanting to sound like a sucker, I always like to believe people are basically honest until proven otherwise. I at least wanted to give the guy the opportunity of admitting a mistake and righting a wrong IF he was to blame. Hence why the car was taken back to his shop. Even now I will not cast blame or mention the name of the shop without getting the facts first, there is always the possibility he is telling the truth.

I have spoken to a number of very helpful people today, (consider yourselves included), watch this space for updates. Thanks for your support, I am slowly getting my sense of humor back.

chuckw951 03-09-2005 03:43 PM

Quote:

Originally posted by ruf-porsche
Don't ask me how I know, had it with the legal system.

Yes, but it only cost $25 to file a claim in small claim court to get the shop's attention, no lawyer needed.

silverc4s 03-09-2005 05:57 PM

Nigel,
You are quite welcome, just one thing - DONT SELL THE CAR - at least until you have some time to reflect on the big picture..

BTW, I would bet that some of the local PCA guys would be happy to help you, member or no - may get you to re-up..;-)

72doug2,2S 03-09-2005 06:32 PM

I agree with most everyone here, do not sell.

Find an atty friend or relative to write a letter. If you don't get satisfaction, it may be time regroup and start a fund for a 3.2 upgrade (thinking of that "T" engine). That car is beautiful. No way will I ever sell my 72.'

BTW, is that car registered at the VTK website? What ever condition it's in it will help in the hot pursuit of all the 72's.

aigel 03-09-2005 06:40 PM

Some half truths here. A valve generally doesn't just fall into the engine by itself. Why woudl it do that? There is a valve retainer that is attached to the spring. I have never heard of that just failing.

Valves fall into the engine because they break off. They break because they get hit by the piston. The valves hit the piston if the cam timing is off, or if you over rev and the valves start floating. The piston generally chases the exhaust valve and at 9000 rpm the piston usually wins.

It is true that more than one valve should get hurt if you have a whole cam out of timing. However, some valves may just be bent a bit, others may break.

Hope this helps.

Geoge

ruf-porsche 03-11-2005 01:01 PM

Quote:

Originally posted by nigel911
...., the death of the engine was pretty un-spectacular...


Why is the engine dead? Does it still crank over but not start?
Is the engine completely seized?

I bent my share of valves in engines, but the engines always crank over even with bent valves.

From your previous posts it sound as though the engine is seized. Couple of thing that will seized an engine, no oil pressure and he bearing are burnt, overheating and the pistons and cylinders are welded together, thrown rod, and drop valves.

A little more info on what wrong with the engine will be helpful.

nigel911 03-11-2005 01:40 PM

Don't know why the engine is dead, this remains to be discovered, prior to failure the oil pressure was fine.

I am 99% certain the piston/barrels are not seized, I personally reckon something (at least one valve) is embedded in a piston/head and therefore the engine is locked. Didn't try turning the engine over by key after it failed, didn't want to risk more damage. The shop apparently tried to turn it over by using a wrench and stated it is locked up, I am assuming they wouldn't have tried to turn the engine backwards...

I was only travelling around 10-15mph when it all went horribly wrong, so I'm guessing it would have been far more dramatic had I been going faster.

Ultimately, the professional opinions I have received all state 'that valves do not generally fail for no apparent reason'

Thanks again to all on the board who have tried to help me with this issue, including those who have only been able to provide moral support. I have also spoken to a number of P-Car professionals who have really gone out of their way to give me lengthy free advice and opinions with no strings attached. Frank at Eibell in St.Pete, Jo at Germantech in Clearwater and Dave at Panache Performance in Sarasota to name a few. Respect due.

I will keep the board informed on how things develop, still looking at all options before making any decisions.

DC_Targa 03-11-2005 01:53 PM

It does seem suspicous that the failure occurred shortly after the tensioner update. However, one possible cause I haven't seen anyone mention yet may be contained in your first thread relative to why you had the tensioner update done. I recall seeing This Thread that suggests that you had a partial tensioner failure and the engine was allowed to continue to run for a few minutes. I'm no P-car expert but is it possible that the partial collapse resulted in enough cam mis-timing such that some amount of piston/valve contact occurred? If this were that case, would the possible contact create enough damage such that valve head separation would occur shortly after the engine was run again?

I do agree with the idea of finding something cheap to drive until you can afford to repair the car. It looks way to nice to sell for cheap (unless you sell it to me) ; )

Good Luck,

Dennis

911mot 03-11-2005 02:03 PM

9 miles / 15mins is way too much of a coincidence.
Did the shop roadtest the car?
Did the flatbed driver note the mileages when he picked you up?
Is the mileage on the shop reciept?
If they didnt properly road test it the oil level could have been way off.
The first thing I would do is get down the shop and take detailed photos of the engine. Be smiley and amicable and say the pics are so you can sell it on ebay or wherever.
Then when you get home tell them not to touch another nut until you have had the car examined by an independant assessor.
Maybe even record the phone call.
Then post the photos here and we should be able to get a better idea of what the shop did to it on your return and advise you what to do next.


My guess is either the oil stat opened and there wasn't enough oil to keep the tensioners fed properly, or they left a camshaft nut loose.

aigel 03-11-2005 03:06 PM

Quote:

Originally posted by 911mot
.... or they left a camshaft nut loose.
There is no need to take off or loosen that nut if all you do is a basic tensioner upgrade.

George

CarreraS2 03-11-2005 03:12 PM

Legally, that is so close to the time of the repair, I wonder if the burden would shift to the shop to prove it wasn't them under some kind of "res ipsa" theory!

The car ran fine for THIRTY THREE YEARS and however many miles.

Then the engine fails on the same DAY, and within 9 miles, after they do work involving the chain tensioning system?

Pure coincidence is almost impossible in that case, IMO.

I'd definately spend some time determining what failed, and put some legal heat on the shop.


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