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Posted by: Bagpype Jul 10 2015, 03:14 PM

Cant be. I found this hole someone apparently cut on top of the transmission. I havent started or driven it yet. Is this hole detrimental? Do I need to seal it? This is the passenger side. For some reason the picture got turned to the left.

Posted by: McMark Jul 10 2015, 03:25 PM

Factory.

Stock.

Posted by: McMark Jul 10 2015, 03:28 PM

Pictures here
http://www.914world.com/bbs2/index.php?showtopic=97216

Posted by: wndsrfr Jul 10 2015, 03:30 PM

It's not going to hurt anything...just vents air out from behind the clutch area...drive it like you stole it....

Posted by: RobW Jul 10 2015, 03:35 PM

Your transmission is clean and holy!

Posted by: Larmo63 Jul 10 2015, 03:37 PM

You time the engine through that hole.

Duh.

Posted by: Bagpype Jul 10 2015, 03:45 PM

Im highly mechanically inclined and this is my first vintage, air cooled Porsche. Im glad you guys are knowledgeable and patient people. Thanks for all the help and the future idiotic questions youre likely to have to help me with. Thanks!!

Posted by: stugray Jul 10 2015, 03:49 PM

I believe he is yanking your chain. You dont time the engine through there.
However there IS another hole where you can see the TDC mark on the flywheel just above that hole where the case meets the engine case (at 12 oclock)

I believe that it's purpose is for a clutch inspection or measurement.
Perhaps there is a way to measure how much clutch disk you have left through there.

Posted by: 72wrxporsche914 Jul 10 2015, 03:53 PM

That's normal that hole is part of the casting of the trans . It's open to the clutch side of the transmission which is not in oil. Drive that thing no worries.

Posted by: brant Jul 10 2015, 04:01 PM

I believe part of its purpose is cooling / venting

Used to have 2 friends racing teeners with 2.2/6 motors that significantly opened that hole for cooling with Tilton multi-plate clutches.

Posted by: theleschyouknow Jul 10 2015, 04:02 PM

I'm trying to get 40 years of dirt and grease cleaned off my trans now I found that hole too and was wondering about it
as far as that goes do I need to worry about getting excess dirt and/or cleaning solution in there? (Dollar Store Awesome Cleaner)
thanks
cjl

Posted by: whitetwinturbo Jul 10 2015, 04:03 PM

These have been known to hide there

Posted by: The Cabinetmaker Jul 10 2015, 04:20 PM

You probably don't want to spray cleaner in there if the trans is installed on the engine. The clutch might not react well.

Posted by: shoguneagle Jul 10 2015, 04:22 PM

Always something new and interesting to learn on these cars. Such a joyful hobby!

Posted by: theleschyouknow Jul 10 2015, 10:11 PM

more worried about the crud that might fall in there as I clean seems like that hole is basically wide open from the top(Gravity is not your friend in this case) surrounded by a nice flat spot that has collected a lot of dirt & grime just waiting to be busted loose and fall in that hole
stuff a rag or some kinda plug in there?
sorry for the hijack

Posted by: ndfrigi Jul 11 2015, 12:20 AM

more pictures inside below that hole.

Posted by: stugray Jul 11 2015, 12:26 AM

That is why I thought it might be an inspection hole.
You can see/touch the throwout bearing
If you put a depth gauge in there when you installed a new clutch to get a baseline, I bet you could tell how much clutch plate you have left as it wore.

Posted by: RobW Jul 11 2015, 06:32 AM

What pretty pictures.

I would say its a vent not a view hole since it doesn't have a cover. Germans are known for their detail. If it was an American car from the 70s, it could be a lift hole for the manufacturing process. Likely a vent.