rebuilding engine

chucai · 09-12-2004, 08:03 AM

Hi all ,

My dad has just purschased a 1982 930 turbo that has done 17000 miles in malaysia. He bought it from a friend who has not really took care of the car. It has oil leak all over it. Therefore, plans for replacing all the gasket are made. The problem is, the mechanic there hasnt got a rebuilt guide of the 930 turbo, (ie torque on screws and ect...) but he still insinst that he is capable of rebuilding it. My question here is, does rebuilding the engine needs to follow the exact specifications of torque that is published in a manual or can i believe what the mechanic is capable off..

All helps and infomations are very very much appreciated

Regards,
Ernest Lai

Jeff Alton · 09-12-2004, 08:36 AM

Some torque values are very, very critical. Make sure he gets the specs or I would take it somewhere else.

Jeff

chucai · 09-12-2004, 09:00 AM

Do you know where can i get hold of these crucial informations as soon as possible...? any chances downloading from the internet ?
I m willing to pay ...

thanks..
ernest

126coupe · 126coupe's Garage

If that mechanic cant or does not have the information, he most likely does not have the tools or expertise to work on a 930. Find a new mechanic

KobaltBlau · 09-12-2004, 06:04 PM

I second what Minkoff said. Is the car still in malaysia? Is there any more qualified mechanic where the car is located? Doing a rebuild twice is much more expensive than having the right mechanic do it the first time!

snowman · 11:28 PM

Awe, comeon--get real-- most torque values are NOT critical. After all actual bolt stretch, which torque is trying to estimate, varies as much as plus or minus 50% OR MORE! Given the size of the bolt, eg 6mm, 8mm or whatever, and the grade of bolt, one can use the Porsche, or for that matter BMW std torque values for that size and be perfactly safe. The only special values are for rod bolts, and possibly head bolts, and even these can be safely assumed given typical Porsche specs for same size fasteners.

If you are going to race it, then you would be using new bolts, and would use the stretch, or torque values specified from where you purchased them.

But on the other side of the coin, anyone working on ANY Porsche should have All the correct values on hand. If they do not they are probably NOT a Porsche mechanic. This is not a problem for a select few "Real" Mechanics, but there are VERY FEW "real" mechanics out there. Also even a "Real" mechanic needs timing specs ect. So beware.

Alan Cottrill · Alan Cottrill's Garage

Welcome back Snowman!

when I think of the 911 motor it seems to me that the list of non critical torque values is shorter than the list of critical torque values.

you mentioned rod bolts, and possibly head bolts. what about the cam towers? if they're not all very close to equal your cam will bind. I know that only necessitates the use of a torque wrench and not the value but It's still critical. how 'bout case through bolts? it they're not all pretty close to the same and at a specific value your main bearing clearences will be compromised and vary from journal to journal. It took me about 0.2 seconds to come up with those two so I'm sure the list gets longer.

and then there's torque sequence....

bottom line, if this guy doesn't have the data, don't let him learn on your car.

again...welcome back snowman

chucai · 09-13-2004, 09:58 AM

I've just spoken to my mechanic today, he said he has done few carreras before and he was pretty sure that the torque value of the carrera are pretty much the same as the 930 turbo.. ..so it is a peace in mind now,.,,!!

Anyway, thanks guys...! and i am now just waiting for my 930 turbo to fire up ..!!!!

regards,
Ernest Lai