Missing tranny case to engine nut

azasadny · azasadny's Garage

Help!

I beginning to put my engine back in the car and noticed that I'm missing one of the 4 nuts that hold the tranny to the engine. Does anyone know what size the nut is that I need to get to replace it? I have a '74 with the 2.7CIS engine. Thanks!

svandamme · svandamme's Garage

the stud should be M10 if i read the diagram right

if i remember correctly , the nuts are all identical , the studs are too , except one is longer for the startermotor...

mb911 · mb911's Garage

Its 10mm Art

Ben

SteveStromberg · 08-02-2004, 09:58 AM

10mm x 1.0 mm pitch

KTL · 08-02-2004, 10:01 AM

M10 it is. Nothing special about it. You should be able to get one at the hardware store.

Vintage911Racer · 08-02-2004, 10:07 AM

I did the same thing.

Mine however was 10 X1.50

azasadny · azasadny's Garage

Thanks! You guys are great!!

Groesbeck Hurricane · 11:53 AM

M10, course thread. The barrel nut that goes on the exhaust studs works well...

EDIT:

Chris B. pointed out an error in my statement:

The barrell nuts on the exhaust studs are 8mm, perhaps you are thinking of the 10mm head stud barrel nuts?

And Chris is dead on!!! The head stud barrel nuts will work.

ChrisBennet · ChrisBennet's Garage

I think the transmission nuts are special or at least some of them are. They are M10x1.5 but instead of taking the usual wrench size (17mm) they take a 15mm wrench. The nut on the bottom, left side of the car needs one of these "reduced wrench size" nuts but I think the other 2 nuts can be "normal" ones.
-Chris

mb911 · mb911's Garage

If your patient you can use any of them but you are right they are special if you want to keep the car correct. I used standerd ones on my car except were the starter bolts up

Ben

KTL · 08-02-2004, 10:27 AM

Quote:

Originally posted by Groesbeck Hurricane
M10, course thread. The barrel nut that goes on the exhaust studs works wel...

I think you mean the barrel nuts on the head studs, as in, the ones inside the valve covers? The exhaust studs are M8 x 1.25 threads.

Quote:

Originally posted by Chris Bennet
I think the transmission nuts are special or at least some of them are. They are M10x1.5 but instead of taking the usual wrench size (17mm) they take a 15mm wrench.

Good catch Chris!!! I simply remembered what I bought from the hardware store to hang my motor on the stand. I forgot that those original nuts were thinner for clearing the transaxle case.